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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/11/13 14:38:22」(JST)

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Structure of E. coli helicase RuvA

Helicases are a class of enzymes vital to all living organisms. Their main function is to unpackage an organism's genes. They are motor proteins that move directionally along a nucleic acid phosphodiester backbone, separating two annealed nucleic acid strands (i.e., DNA, RNA, or RNA-DNA hybrid) using energy derived from ATP hydrolysis. There are many helicases resulting from the great variety of processes in which strand separation must be catalyzed. Approximately 1% of eukaryotic genes code for helicases.^[1] In humans, 95 non-redundant helicases are coded for in the genome, 64 RNA helicases and 31 DNA helicases.^[2] Many cellular processes, such as DNA replication, transcription, translation, recombination, DNA repair, and ribosome biogenesis involve the separation of nucleic acid strands that necessitates the use of helicases.

1 Function
- 1.1 Activation barrier in helicase activity
- 1.2 Active and passive helicases
2 History of DNA helicase discovery
3 Structural features
4 Superfamilies
5 Helicase disorders and diseases
- 5.1 ATRX helicase mutations
- 5.2 XPD helicase point mutations
- 5.3 RecQ family mutations
6 RNA helicases
7 Diagnostic tools for helicase measurement
- 7.1 Measuring/monitoring helicase activity
- 7.2 Determining helicase polarity
8 See also
9 References
10 External links

Function[edit]

Helicase action in DNA replication

Helicases are often used to separate strands of a DNA double helix or a self-annealed RNA molecule using the energy from ATP hydrolysis, a process characterized by the breaking of hydrogen bonds between annealed nucleotide bases. They also function to remove nucleic acid-associated proteins and catalyze homologous DNA recombination.^[3] Metabolic processes of RNA such as translation, transcription, ribosome biogenesis, RNA splicing, RNA transport, RNA editing, and RNA degradation are all facilitated by helicases.^[3] Helicases move incrementally along one nucleic acid strand of the duplex with a directionality and processivity specific to each particular enzyme.

Helicases adopt different structures and oligomerization states. Whereas DnaB^{[disambiguation needed]}-like helicases unwind DNA as donut-shaped hexamers, other enzymes have been shown to be active as monomers or dimers. Studies have shown that helicases may act passively, waiting for uncatalyzed unwinding to take place and then translocating between displaced strands,^[4] or can play an active role in catalyzing strand separation using the energy generated in ATP hydrolysis.^[5] In the latter case, the helicase acts comparably to an active motor, unwinding and translocating along its substrate as a direct result of its ATPase activity.^[6] Helicases may process much faster in vivo than in vitro due to the presence of accessory proteins that aid in the destabilization of the fork junction.^[6]

Activation barrier in helicase activity[edit]

Enzymatic helicase action, such as unwinding nucleic acids is achieved through the lowering of the activation barrier (B) of each specific action.^[7] The activation barrier is a result of various factors, and can be defined using the following equation, where N = number of unwound base pairs (bps), ΔG_bp = free energy of base pair formation, G_int = reduction of free energy due to helicase, and G_ƒ = reduction of free energy due to unzipping forces.^[7]

B = N (ΔG_bp-G_int-G_ƒ)

Factors that contribute to the height of the activation barrier include: specific nucleic acid sequence of the molecule involved, the number of base pairs involved, tension present on the replication fork, and destabilization forces.^[7]

Active and passive helicases[edit]

The size of the activation barrier to overcome by the helicase contributes to its classification as an active or passive helicase. In passive helicases, a significant activation barrier exists (defined as B > k_BT, where k_B is Boltzmann's constant and T is temperature of the system).^[7] Because of this significant activation barrier, its unwinding progression is largely affected by the sequence of nucleic acids within the molecule to unwind, and the presence of destabilization forces acting on the replication fork.^[7] Certain nucleic acid combinations will decrease unwinding rates (i.e. guanine and cytosine), while various destabilizing forces can increase the unwinding rate.^[7] In passive systems, the rate of unwinding (V_un) is less than the rate of translocation (V_trans) (translocation along the single-stranded nucleic acid, ssNA).^[7] Another way to view the passive helicase is its reliance on the transient unraveling of the base pairs at the replication fork to determine its rate of unwinding.^[7]

In active helicases, B < k_BT, where the system lacks a significant barrier, as the helicase is able to destabilize the nucleic acids, unwinding the double-helix at a constant rate, regardless of the nucleic acid sequence.^[7] In active helicases, V_un is approximately equal to V_trans.^[7] Another way to view the active helicase is its ability to directly destabilize the replication fork to promote unwinding.^[7]

Active helicases show similar behavior when acting on both double-stranded nucleic acids, dsNA, or ssNA, in regards to the rates of unwinding and rates of translocation, where in both systems V_un and V_trans are approximately equal.

History of DNA helicase discovery[edit]

DNA helicases were first discovered in E. coli in 1976. The discoverers of this helicase described the molecule as a “DNA unwinding enzyme” that is “found to denature DNA duplexes in an ATP-dependent reaction, without detectably degrading”.^[8] The first eukaryotic DNA helicase discovery was in 1978 and found in the lily plant.^[9] Since then, DNA helicases were discovered and isolated in other bacteria, viruses, yeast, flies, and higher eukaryotes and have thus been accordingly named as “prokaryotic”, “eukaryotic”, “bacteriophage”, and “viral”.^[10] To date, at least 14 different helicases have been isolated from single celled organisms, 6 helicases have been isolated from bacteriophages, 12 have been isolated from viruses, 15 from yeast, 8 from plants, 11 from calf thymus, and approximately 25 helicases have been identified from human cells.^[11] Below is a short description of the helicase discovery history:

1976 – Discovery and isolation of E. coli based DNA helicase^[8]
1978 – Discovery of the first eukaryotic DNA helicases, isolated from the lily plant^[9]
1982 – “T4 jean 41 protein” is the first reported bacteriophage DNA helicase^[10]
1985 – First mammalian DNA helicases isolated from calf thymus^[12]
1986 – SV40 large tumor antigen reported as a viral helicase (1st reported viral protein that was determined to serve as a DNA helicase)^[13]
1986 – ATPaseIII, a yeast protein, determined to be a DNA helicase^[14]
1988 – Discovery of seven conserved amino acid domains determined to be helicase motifs
1989 – Designation of DNA helicase Superfamily I and Superfamily II^[15]
1989 - Identification of the DEAD box helicase family^[16]
1990 - Isolation of a human DNA helicase^[17]
1992 – Isolation of the first reported mitochondrial DNA helicase (from bovine brain)^[18]
1996 – Report of the discovery of the first purified chloroplast DNA helicase from the pea^[19]
2002 – Isolation and characterization of the first biochemically active malarial parasite DNA helicase - Plasmodium cynomolgi.^[20]

Structural features[edit]

The common function of helicases accounts for the fact that they display a certain degree of amino acid sequence homology; they all possess common sequence motifs located in the interior of their primary structure. These are thought to be specifically involved in ATP binding, ATP hydrolysis and translocation on the nucleic acid substrate. The variable portion of the amino acid sequence is related to the specific features of each helicase.

Based on the presence of defined helicase motifs, it is possible to attribute a putative helicase activity to a given protein, though the presence of a motif does not confirm the protein as a helicase. Conserved motifs do, however, support an evolutionary homology among enzymes. Based on the presence and the form of helicase motifs, helicases have been separated in 4 superfamilies and 2 smaller families. Some members of these families are indicated, with the organism from which they are extracted, and their function.

Superfamilies[edit]

Helicases have been classified in 6 major groups (superfamilies) based on the motifs and consensus sequences shared by the molecules.^[21] Helicases that do not form a ring structure are included in superfamilies 1 and 2 and the ring forming helicases form part of superfamilies 3 to 6.^[22] Helicases are also classified as α or β depending on if they work with single or double stranded DNA, α helicases work with single stranded DNA and β helicases work with double stranded DNA. They are also classified by translocation polarity. If translocation occurs 3’-5’ then the helicase is a type A helicase or if translocation occurs 5’-3’ then it is a type B Helicase.^[21]

Superfamily 1 (SF1): In this group helicases can have either 3’-5’ or 5’-3’ translocation polarity.^[21] This subgroup is at the same time subdivided in SF1A and SF1B Helicases.^[21] The most known SF1A helicases are Rep and UvrD^{[disambiguation needed]} in gram-negative bacteria and PcrA helicase from gram-positive bacteria.^[21] The most known Helicases in the SF1B group are RecD and Dda helicases.^[21]

Superfamily 2 (SF2): This is the largest group of helicases that are involved in varied cellular processes.^[23]^[21] They are characterized by the presence of nine conserved motifs: Q, I, Ia, Ib and from II to VI.^[23] This group is mainly composed of DEAD-box RNA helicases.^[22] Some other helicases included in SF2 are the RecQ-like family and the Snf2-like enzymes.^[21] Most of the SF2 helicases are type A with a few exceptions such as the XPD family.^[21]

Superfamily 3 (SF3): Superfamily 3 consists of helicases encoded mainly by small DNA viruses and some large nucleocytoplasmic DNA viruses.^[24]^[25] They have a 3’-5’ translocation directionality, meaning that they are all type A helicases.^[21] The most known SF3 helicase is the papilloma virus E1 helicase.^[21]

Superfamily 4 (SF4): All SF4 family helicases have a type B polarity (5’-3’).^[21] The most studied SF4 helicase is gp4 from bacteriophage T7.^[21]

Superfamily 5 (SF5): Rho proteins conform the SF5 group.^[21]

Superfamily 6 (SF6): They contain the core AAA+ that is not included in the SF3 classification.^[21] Some proteins in the SF6 group are: mini chromosome maintenance MCM, RuvB, RuvA and RuvC.^[21]

Helicase disorders and diseases[edit]

ATRX helicase mutations[edit]

The ATRX gene encodes the ATP-dependent helicase, ATRX (also known as XH2 and XNP) of the SNF2 subgroup family, that is thought to be responsible for functions such as chromatin remodeling, gene regulation, and DNA methylation.^[26]^[27]^[28]^[29] These functions assist in prevention of apoptosis, resulting in cortical size regulation, as well as a contribution to the survival of hippocampal and cortical structures, affecting memory and learning.^[26] This helicase is located on the X chromosome (Xq13.1-q21.1), in the pericentromeric heterochromatin and binds to Heterochromatin protein 1.^[26]^[28] Studies have shown that ATRX plays a role in rDNA methylation and is essential for embyonic development.^[30] Mutations have been found throughout the ATRX protein, with over 90% of them being located in the zinc finger and helicase domains.^[31] Mutations of ATRX can result in X-linked-alpha-thalassaemia-mental retardation (ATR-X syndrome).^[26]

Various types of mutations found in ATRX have been found to be associated with ATR-X, including most commonly single-base missense mutations, as well as nonsense, frameshift, and deletion mutations.^[29] Characteristics of ATR-X include: microcephaly, skeletal and facial abnormalities, mental retardation, genital abnormalities, seizures, limited language use and ability, and alpha-thalassemia.^[26]^[30]^[32] The phenotype seen in ATR-X suggests that the mutation of ATRX gene causes the downregulation of gene expression, such as the alpha-globin genes.^[32] It is still unknown what causes the expression of the various characteristics of ATR-X in different patients.^[30]

XPD helicase point mutations[edit]

XPD (Xeroderma pigmentosum factor D, also known as protein ERCC2) is a 5'-3', Superfamily II, ATP-dependent helicase containing iron-sulphur cluster domains.^[33]^[34] Inherited point mutations in XPD helicase have been shown to be associated with accelerated aging disorders such as Cockayne syndrome (CS) and trichothiodystrophy (TTD).^[35] Cockayne syndrome and trichothiodystrophy are both developmental disorders involving sensitivity to UV light and premature aging, and Cockayne syndrome exhibits severe mental retardation from the time of birth.^[35] The XPD helicase mutation has also been implicated in xeroderma pigmentosa (XP), a disorder characterized by sensitivity to UV light and resulting in a several 1000-fold increase in the development of skin cancer.^[35]

XPD is an essential component of the TFIIH complex, a transcription and repair factor in the cell.^[35]^[36]^[37]^[38]^[39] As part of this complex, it facilitates nucleotide excision repair by unwinding DNA.^[35] TFIIH assists in repairing damaged DNA such as sun damage.^[35]^[36]^[37]^[38]^[39] A mutation in the XPD helicase which helps form this complex and contributes to its function causes the sensitivity to sunlight seen in all three diseases, as well as the increased risk of cancer seen in XP and premature aging seen in trichothiodystrophy and Cockayne syndrome.^[35]

XPD helicase mutations leading to trichothiodystrophy are found throughout the protein in various locations involved in protein-protein interactions.^[35] This mutation results in an unstable protein due to its inability to form stabilizing interactions with other proteins at the points of mutations.^[35] This, in turn, destabilizes the entire TFIIH complex which leads to defects with transcription and repair mechanisms of the cell.^[35]

It has been suggested that XPD helicase mutations leading to Cockayne syndrome could be the result of mutations within XPD causing rigidity of the protein and subsequent inability to switch from repair functions to transcription functions due to a "locking" in repair mode.^[35] This could cause the helicase to cut DNA segments meant for transcription.^[35] Although current evidence points to a defect in the XPD helicase resulting in a loss of flexibility in the protein in cases of Cockayne syndrome, it is still unclear how this protein structure leads to the symptoms described in Cockayne syndrome.^[35]

In xeroderma pigmentosa, the XPD helicase mutation exists at the site of ATP or DNA binding.^[35] This results in a structurally functional helicase able to facilitate transcription, however it inhibits its function in unwinding DNA and DNA repair.^[35] The lack of cell's ability to repair mutations, such as those caused by sun damage, is the cause of the high cancer rate in xeroderma pigmentosa patients.

RecQ family mutations[edit]

RecQ helicase

RecQ helicases (3'-5') belong to the Superfamily II group of helicases, which help to maintain stability of the genome and suppress inappropriate recombination.^[40]^[41] Deficiencies and/or mutations in RecQ family helicases display aberrant jeanetic recombination and/or DNA replication, which leads to chromosomal instability and an overall decreased ability to proliferate.^[40] Mutations in RecQ family helicases BLM, RECQL4, and WRN, which play a role in regulating homologous recombination, have been shown to result in the autosomal recessive diseases Bloom syndrome (BS), Rothmund-Thomson syndrome (RTS), and Werner syndrome (WS), respectively.^[41]^[42]

Bloom syndrome is characterized by a predisposition to cancer with early onset, with a mean age-of-onset of 24 years.^[41]^[43] Cells of Bloom syndrome patients show a high frequency of reciprocal exchange between sister chromatids (SCEs) and excessive chromosomal damage.^[44] There is evidence to suggest that BLM plays a role in rescuing disrupted DNA replication at replication forks.^[44]

Werner syndrome is a disorder of premature aging, with symptoms including early onset of atherosclerosis and osteoporosis and other age related diseases, a high occurrence of sarcoma, and death often occurring from myocardial infarction or cancer in the 4th to 6th decade of life.^[41]^[45] Cells of Werner syndrome patients exhibit a reduced reproductive lifespan with chromosomal breaks and translocations, as well as large deletions of chromosomal components, causing genomic instability.^[45]

Rothmund-Thomson syndrome, also known as poikiloderma congenitale, is characterized by premature aging, skin and skeletal abnormalities, rash, poikiloderma, juvenile cataracts, and a predisposition to cancers such as osteosarcomas.^[41]^[46] Chromosomal rearrangements causing genomic instability are found in the cells of Rothmund-Thomson syndrome patients.^[46]

RNA helicases[edit]

Human DEAD-box RNA helicase

RNA helicases are essential for most processes of RNA metabolism such as ribosome biogenesis, pri-mRNA splicing and translation initiation. Besides being involved in all the previous processes RNA helicases also play a very important role in sensing viral RNAs.^[47] RNA helicases are involved in the mediation of antiviral immune response because they able to identify foreign RNAs in vertebrates. About 80% of all viruses are RNA viruses and they contain their own RNA helicases.^[48] Defective RNA helicases have been linked to cancer, infectious diseases and neuro-degenerative disorders.^[47] Some neurological disorders associated with defective RNA helicases are: amyotrophic lateral sclerosis, spinal muscular atrophy, spinocerebellar ataxia type-2, Alzheimer disease, and lethal congenital contracture syndrome.^[48]

RNA helicases and DNA helicases can be found together in all the helicase superfamilies except for SF6.^[49]^[50] All the eukaryotic RNA helicases that have been identified up to date are non-ring forming and are part of SF1 and SF2. On the other hand, ring-forming RNA helicases have been found in bacteria and viruses.^[47] However, not all RNA helicases exhibit helicase activity as defined by enzymatic function, i.e., proteins of the Swi/Snf family. Although these proteins carry the typical helicase motifs, hydrolize ATP in a nucleic acid-dependent manner, and are built around a helicase core, in general, no unwinding activity is observed.^[51]

RNA helicases that do exhibit unwinding activity have been characterized by at least two different mechanisms: canonical duplex unwinding and local strand separation. Canonical duplex unwinding is the stepwise directional separation of a duplex strand, as described above, for DNA unwinding. However, local strand separation occurs by a process wherein the helicase enzyme is loaded at any place along the duplex. This is usually aided by a single-stranded region of the RNA, and the loading of the enzyme is accompanied with ATP binding.^[52] Once the helicase and ATP are bound, local strand separation occurs, which requires binding of ATP but not the actual process of ATP hydrolysis.^[53] Presented with fewer base pairs the duplex then dissociates without further assistance from the enzyme. This mode of unwinding is used by DEAD-box helicases.^[54]

There is a RNA helicase database currently available online that contains a comprehensive list of RNA helicases with information such as sequence, structure, and biochemical and cellular functions.^[47]

Diagnostic tools for helicase measurement[edit]

Measuring/monitoring helicase activity[edit]

Various methods are used to measure helicase activity in vitro. These methods range from assays that are qualitative (assays that usually entail results that do not involve values or measurements) to quantitative (assays with numerical results that can be utilized in statistical and numerical analysis). In 1982-1983, the first direct biochemical assay was developed for measuring helicase activity.^[10]^[55] This method was called a “strand displacement assay”.

Strand displacement assay involves the radiolabeling of DNA duplexes. Following helicase treatment, the single-stranded DNA is visually detected as separate from the double-stranded DNA by non-denaturing PAGE electrophoresis. Following detection of the single-stranded DNA, the amount of radioactive tag that is on the single-stranded DNA is quantified to give a numerical value for the amount of double-stranded DNA unwinding.

The strand displacement assay is acceptable for qualitative analysis, its inability to display results for more than a single time point, its time consumption, and its dependance on a radioactive bio-hazard for labeling warranted the need for development of diagnostics that can monitor helicase activity in real time.

Other methods were later developed that incorporated some, if not all of the following: high throughput mechanics, the use of less hazardous nucleotide labeling, faster reaction time/less time consumption, real-time monitoring of helicase activity (using kinetic measurement instead of endpoint/single point analysis). These methodologies include: "a rapid quench flow method, fluorescence based assays, filtration assays, a scintillation proximity assay, a time resolved fluorescence resonance energy transfer assay, an assay based on flashplate technology, homogenous time-resolved fluorescence quenching assays, and electrochemiluminescence-based helicase assays".^[11] With the used of specialized mathematical equations, some of these assays can be utilized to determine how many base paired nucleotides a helicase can break per hydrolysis of 1 ATP molecule.^[56]

Commercially available diagnostic kits are also available. One such kit is the "Trupoint" diagnostic assay from PerkinElmer, Inc. This assay is a time-resolved fluorescence quenching assay that utilizes the PerkinEmer "SignalClimb" technology that is based on two labels which bind in close proximity to one another but on opposite DNA strands . One label is a fluorescent lanthanide chelate which serves as the label that is monitored through an adequate 96/384 well plate reader. The other label is an organic quencher molecule. The basis of this assay is the "quenching" or repressing of the lanthanide chelate signal by the organic quencher molecule when the two are in close proximity - as they would be when the DNA duplex is in its native state. Upon helicase activity on the duplex the quencher and lanthanide labels get separated as the DNA is unwound. This loss in proximity negates the quenchers ability to repress the lanthanide signal, causing a detectable increase in fluorescence that is representative of the amount of unwound DNA and can be used as a quantifiable measurement of helicase activity.

Determining helicase polarity[edit]

Helicase polarity, which is also deemed "directionality", is defined as the direction (characterized as 5'→3' or 3'→5') of helicase movement on single stranded DNA. This determination of polarity is vital in determining whether the tested helicase attaches to the DNA leading strand, or the DNA lagging strand. To characterize this helicase feature, a partially duplex DNA is used as the substrate which has a central single-stranded DNA region with different lengths of duplex regions of DNA (1 short region that runs 5'→3' and 1 longer region that runs 3'→5') on both sides of this region.^[57] Once the helicase is added to that central single-stranded region, the polarity is determined by characterization on the newly formed single-stranded DNA.

References[edit]

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^ Singleton MR, Dillingham MS, Wigley DB (2007). "Structure and mechanism of helicases and nucleic acid translocases". Annu. Rev. Biochem. 76: 23–50. doi:10.1146/annurev.biochem.76.052305.115300. PMID 17506634.
^ Rudolf J, Rouillon C, Schwarz-Linek U, White MF (January 2010). "The helicase XPD unwinds bubble structures and is not stalled by DNA lesions removed by the nucleotide excision repair pathway". Nucleic Acids Res. 38 (3): 931–41. doi:10.1093/nar/gkp1058. PMC 2817471. PMID 19933257.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o Fan L, Fuss JO, Cheng QJ, Arvai AS, Hammel M, Roberts VA, Cooper PK, Tainer JA (May 2008). "XPD helicase structures and activities: insights into the cancer and aging phenotypes from XPD mutations". Cell 133 (5): 789–800. doi:10.1016/j.cell.2008.04.030. PMC 3055247. PMID 18510924.
^ ^a ^b Lainé JP, Mocquet V, Egly JM (2006). "TFIIH enzymatic activities in transcription and nucleotide excision repair". Meth. Enzymol. Methods in Enzymology 408: 246–63. doi:10.1016/S0076-6879(06)08015-3. ISBN 9780121828134. PMID 16793373.
^ ^a ^b Tirode F, Busso D, Coin F, Egly JM (January 1999). "Reconstitution of the transcription factor TFIIH: assignment of functions for the three enzymatic subunits, XPB, XPD, and cdk7". Mol. Cell 3 (1): 87–95. doi:10.1016/S1097-2765(00)80177-X. PMID 10024882.
^ ^a ^b Sung P, Bailly V, Weber C, Thompson LH, Prakash L, Prakash S (October 1993). "Human xeroderma pigmentosum group D jean encodes a DNA helicase". Nature 365 (6449): 852–5. doi:10.1038/365852a0. PMID 8413672.
^ ^a ^b Schaeffer L, Roy R, Humbert S, Moncollin V, Vermeulen W, Hoeijmakers JH, Chambon P, Egly JM (April 1993). "DNA repair helicase: a component of BTF2 (TFIIH) basic transcription factor". Science 260 (5104): 58–63. doi:10.1126/science.8465201. PMID 8465201.
^ ^a ^b Hanada K, Hickson ID (September 2007). "Molecular jeanetics of RecQ helicase disorders". Cell. Mol. Life Sci. 64 (17): 2306–22. doi:10.1007/s00018-007-7121-z. PMID 17571213.
^ ^a ^b ^c ^d ^e Opresko PL, Cheng WH, Bohr VA (April 2004). "Junction of RecQ helicase biochemistry and human disease". J. Biol. Chem. 279 (18): 18099–102. doi:10.1074/jbc.R300034200. PMID 15023996.
^ Ouyang KJ, Woo LL, Ellis NA (2008). "Homologous recombination and maintenance of genome integrity: cancer and aging through the prism of human RecQ helicases". Mech. Ageing Dev. 129 (7–8): 425–40. doi:10.1016/j.mad.2008.03.003. PMID 18430459.
^ Ellis NA, Groden J, Ye TZ, Straughen J, Lennon DJ, Ciocci S, Proytcheva M, German J (November 1995). "The Bloom's syndrome jean product is homologous to RecQ helicases". Cell 83 (4): 655–66. doi:10.1016/0092-8674(95)90105-1. PMID 7585968.
^ ^a ^b Selak N, Bachrati CZ, Shevelev I, Dietschy T, van Loon B, Jacob A, Hübscher U, Hoheisel JD, Hickson ID, Stagljar I (September 2008). "The Bloom's syndrome helicase (BLM) interacts physically and functionally with p12, the smallest subunit of human DNA polymerase delta". Nucleic Acids Res. 36 (16): 5166–79. doi:10.1093/nar/gkn498. PMC 2532730. PMID 18682526.
^ ^a ^b Gray MD, Shen JC, Kamath-Loeb AS, Blank A, Sopher BL, Martin GM, Oshima J, Loeb LA (September 1997). "The Werner syndrome protein is a DNA helicase". Nat. Genet. 17 (1): 100–3. doi:10.1038/ng0997-100. PMID 9288107.
^ ^a ^b Kitao S, Shimamoto A, Goto M, Miller RW, Smithson WA, Lindor NM, Furuichi Y (May 1999). "Mutations in RECQL4 cause a subset of cases of Rothmund-Thomson syndrome". Nat. Genet. 22 (1): 82–4. doi:10.1038/8788. PMID 10319867.
^ ^a ^b ^c ^d Jankowsky, A.; Guenther, U. -P.; Jankowsky, E. (2010). "The RNA helicase database". Nucleic Acids Research 39 (Database issue): D338–D341. doi:10.1093/nar/gkq1002. PMC 3013637. PMID 21112871. edit
^ ^a ^b Steimer, L.; Klostermeier, D. (2012). "RNA helicases in infection and disease". RNA Biology 9 (6): 751–771. doi:10.4161/rna.20090. PMID 22699555. edit
^ Jankowsky E, Fairman-Williams ME (2010). "An introduction to RNA helicases: superfamilies, families, and major themes". In Jankowsky E. RNA Helicases (RSC Biomolecular Sciences). Cambridge, England: Royal Society of Chemistry. p. 5. ISBN 1-84755-914-X.
^ Ranji, A.; Boris-Lawrie, K. (2010). "RNA helicases: Emerging roles in viral replication and the host innate response". RNA Biology 7 (6): 775–787. doi:10.4161/rna.7.6.14249. PMC 3073335. PMID 21173576. edit
^ Jankowsky E (January 2011). "RNA helicases at work: binding and rearranging". Trends Biochem. Sci. 36 (1): 19–29. doi:10.1016/j.tibs.2010.07.008. PMC 3017212. PMID 20813532.
^ Yang Q, Del Campo M, Lambowitz AM, Jankowsky E (October 2007). "DEAD-box proteins unwind duplexes by local strand separation". Mol. Cell 28 (2): 253–63. doi:10.1016/j.molcel.2007.08.016. PMID 17964264.
^ Liu F, Putnam A, Jankowsky E (December 2008). "ATP hydrolysis is required for DEAD-box protein recycling but not for duplex unwinding". Proc. Natl. Acad. Sci. U.S.A. 105 (51): 20209–14. doi:10.1073/pnas.0811115106. PMC 2629341. PMID 19088201.
^ Jarmoskaite I, Russell R (2011). "DEAD-box proteins as RNA helicases and chaperones". Wiley Interdiscip Rev RNA 2 (1): 135–52. doi:10.1002/wrna.50. PMC 3032546. PMID 21297876.
^ Matson SW, Tabor S, Richardson CC (November 1983). "The jean 4 protein of bacteriophage T7. Characterization of helicase activity". J. Biol. Chem. 258 (22): 14017–24. PMID 6315716.
^ Sarlós K, Gyimesi M, Kovács M (June 2012). "RecQ helicase translocates along single-stranded DNA with a moderate processivity and tight mechanochemical coupling". Proc. Natl. Acad. Sci. U.S.A. 109 (25): 9804–9. doi:10.1073/pnas.1114468109. PMC 3382518. PMID 22665805.
^ Borowiec, J. (1996) DNA Replication in Eukaryotic Cells. Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY. 545-574

External links[edit]

DNA Helicases at the US National Library of Medicine Medical Subject Headings (MeSH)
RNA Helicases at the US National Library of Medicine Medical Subject Headings (MeSH)

UpToDate Contents

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1. 様々な抗核抗体 miscellaneous antinuclear antibodies
2. 分子遺伝学の原理 principles of molecular genetics
3. 炎症性ミオパチーの病因 pathogenesis of inflammatory myopathies
4. DiGeorge syndrome: Epidemiology and pathogenesis
5. DiGeorge syndrome: Clinical features and diagnosis

English Journal

The selective footprints of viral pressures at the human RIG-I-like receptor family.

Vasseur E, Patin E, Laval G, Pajon S, Fornarino S, Crouau-Roy B, Quintana-Murci L.AbstractThe RIG-I-like receptors (RLRs)-RIG-I, IFIH1 (or MDA5) and LGP2-are thought to be key actors in the innate immune system, as they play a major role in sensing RNA viruses in the cytosol of host cells. Despite the increasingly recognized importance of the RLR family in antiviral immunity, no population genetic studies have yet attempted to compare the evolutionary history of its different members in humans. Here, we characterized the levels of naturally occurring genetic variation in the RLRs in a panel of individuals of different ethnic origins, to assess to what extent natural selection has acted on this family of microbial sensors. Our results show that amino acid-altering variation at RIG-I, particularly in the helicase domain, has been under stronger evolutionary constraint than that at IFIH1 and LGP2, reflecting an important role for RIG-I in sensing numerous RNA viruses and/or functional constraints related to the binding of viral substrates. Such evolutionary constraints have been much more relaxed at IFIH1 and LGP2, which appear to have evolved adaptively in specific human populations. Notably, we identified several mutations showing signatures of positive selection, including two non-synonymous polymorphisms in IFIH1 (R460H and R843H) and one in LGP2 (Q425R), suggesting a selective advantage related to the sensing of RNA viruses by IFIH and to the regulatory functions of LGP2. In light of the fact that some of these mutations have been associated with altered risks of developing autoimmune disorders, our study provides an additional example of the evolutionary conflict between infection and autoimmunity.
Human molecular genetics.Hum Mol Genet.2011 Nov 15;20(22):4462-74. Epub 2011 Aug 24.
The RIG-I-like receptors (RLRs)-RIG-I, IFIH1 (or MDA5) and LGP2-are thought to be key actors in the innate immune system, as they play a major role in sensing RNA viruses in the cytosol of host cells. Despite the increasingly recognized importance of the RLR family in antiviral immunity, no populati
PMID 21865300

The DNA damage checkpoint allows recombination between divergent DNA sequences in budding yeast.

George CM, Lyndaker AM, Alani E.SourceDepartment of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853-2073, United States.
DNA repair.DNA Repair (Amst).2011 Nov 10;10(11):1086-94. Epub 2011 Oct 5.
In the early steps of homologous recombination, single-stranded DNA (ssDNA) from a broken chromosome invades homologous sequence located in a sister or homolog donor. In genomes that contain numerous repetitive DNA elements or gene paralogs, recombination can potentially occur between non-allelic/di
PMID 21978436

Japanese Journal

Hepatitis C Virus NS3 Protein Can Activate the Notch-Signaling Pathway through Binding to a Transcription Factor, SRCAP

Iwai Atsushi,Takegami Tsutomu,Shiozaki Takuya,Miyazaki Tadaaki
PLoS One 6(6), e20718, 2011-06-06
… Nonstructural protein 3 (NS3) of HCV has serine protease and RNA helicase domains, and is essential for the viral replication. …
NAID 120003075341

ZAPS is a potent stimulator of signaling mediated by the RNA helicase RIG-I during antiviral responses

Hayakawa Sumio,Shiratori Souichi,Yamato Hiroaki,Kameyama Takeshi,Kitatsuji Chihiro,Kashigi Fumi,Goto Showhey,Kameoka Shoichiro,Fujikura Daisuke,Yamada Taisho,Mizutani Tatsuaki,Kazumata Mika,Sato Maiko,Tanaka Junji,Asaka Masahiro,Ohba Yusuke,Miyazaki Tadaaki,Imamura Masahiro,Takaoka Akinori
Nature Immunology 12(1), 37-44, 2011-01
The poly(ADP-ribose) polymerases (PARPs) participate in various processes. Here, we report that the PARP-13/ZAP shorter isoform (hereafter called ZAPS), rather than the full length protein, is selecti …
NAID 120003118156

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★リンクテーブル★

リンク元	「ヘリケース」
拡張検索	「RecQ helicase」「DNA helicase family」

「ヘリケース」

RNA helicase
Identifiers
EC number	3.6.4.13
Databases
IntEnz	IntEnz view
BRENDA	BRENDA entry
ExPASy	NiceZyme view
KEGG	KEGG entry
MetaCyc	metabolic pathway
PRIAM	profile
PDB structures	RCSB PDB PDBe PDBsum
Search
PMC	articles
PubMed	articles
NCBI	proteins

Search
PMC	articles
PubMed	articles
NCBI	proteins

DNA helicase
Identifiers
EC number	3.6.4.12
Databases
IntEnz	IntEnz view
BRENDA	BRENDA entry
ExPASy	NiceZyme view
KEGG	KEGG entry
MetaCyc	metabolic pathway
PRIAM	profile
PDB structures	RCSB PDB PDBe PDBsum
Search
PMC	articles
PubMed	articles
NCBI	proteins

　　[★]

英: helicase
関: ヘリカーゼ

「RecQ helicase」

　　[★] (DNA巻き戻し修復酵素)RecQヘリカーゼ

「DNA helicase family」

　　[★] DNAヘリカーゼファミリー

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[Patel2006-3] Patel, S. S.; Donmez, I (2006). "Mechanisms of Helicases". Journal of Biological Chemistry 281 (27): 18265–18268. doi:10.1074/jbc.R600008200. ISSN 0021-9258. PMID 16670085.

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[Johnson-5] Johnson DS, Bai L, Smith BY, Patel SS, Wang MD (2007). "Single-molecule studies reveal dynamics of DNA unwinding by the ring-shaped t7 helicase". Cell 129 (7): 1299–309. doi:10.1016/j.cell.2007.04.038. PMC 2699903. PMID 17604719.

[physorg1-6] "Researchers solve mystery of how DNA strands separate". 2007-07-03. Retrieved 2007-07-05.

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[Abdel-8] Abdel-Monem M, Dürwald H, Hoffmann-Berling H (June 1976). "Enzymic unwinding of DNA. 2. Chain separation by an ATP-dependent DNA unwinding enzyme". Eur. J. Biochem. 65 (2): 441–9. doi:10.1111/j.1432-1033.1976.tb10359.x. PMID 133023.

[Hotta-9] Hotta Y, Stern H (May 1978). "DNA unwinding protein from meiotic cells of Lilium". Biochemistry 17 (10): 1872–80. doi:10.1021/bi00603a011. PMID 207302.

[Venkatesan_1982-10] Venkatesan M, Silver LL, Nossal NG (October 1982). "Bacteriophage T4 jean 41 protein, required for the synthesis of RNA primers, is also a DNA helicase". J. Biol. Chem. 257 (20): 12426–34. PMID 6288720.

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[12] Hubscher U, Stalder HP (1985). "Mammalian DNA helicase". Nucleic Acids Res 13: 5471–5483. doi:10.1093/nar/13.15.5471. PMID 3162158.

[pmid3019672-13] Stahl H, Dröge P, Knippers R (August 1986). "DNA helicase activity of SV40 large tumor antigen". EMBO J. 5 (8): 1939–44. PMC 1167061. PMID 3019672.

[pmid3017945-14] Sugino A, Ryu BH, Sugino T, Naumovski L, Friedberg EC (September 1986). "A new DNA-dependent ATPase which stimulates yeast DNA polymerase I and has DNA-unwinding activity". J. Biol. Chem. 261 (25): 11744–50. PMID 3017945.

[pmid2546125-15] Gorbalenya AE, Koonin EV, Donchenko AP, Blinov VM (June 1989). "Two related superfamilies of putative helicases involved in replication, recombination, repair and expression of DNA and RNA genomes". Nucleic Acids Res. 17 (12): 4713–30. doi:10.1093/nar/17.12.4713. PMC 318027. PMID 2546125.

[16] Linder, P., Lasko, P.F., Ashburner, M., Leroy, P., Nielson, P.J., Nishi, K., Schneir, J., Slonimski, P.P. (1989) Birth of the DEAD-box. Nature (London) 337, 121-122.

[pmid1702201-17] Tuteja N, Tuteja R, Rahman K, Kang LY, Falaschi A (December 1990). "A DNA helicase from human cells". Nucleic Acids Res. 18 (23): 6785–92. doi:10.1093/nar/18.23.6785. PMC 332732. PMID 1702201.

[pmid1326759-18] Hehman GL, Hauswirth WW (September 1992). "DNA helicase from mammalian mitochondria". Proc. Natl. Acad. Sci. U.S.A. 89 (18): 8562–6. doi:10.1073/pnas.89.18.8562. PMC 49960. PMID 1326759.

[pmid8665952-19] Tuteja N, Phan TN, Tewari KK (May 1996). "Purification and characterization of a DNA helicase from pea chloroplast that translocates in the 3'-to-5' direction". Eur. J. Biochem. 238 (1): 54–63. doi:10.1111/j.1432-1033.1996.0054q.x. PMID 8665952.

[pmid12387853-20] Tuteja R, Malhotra P, Song P, Tuteja N, Chauhan VS (2002). "Isolation and characterization of an eIF-4A homologue from Plasmodium cynomolgi". Mol. Biochem. Parasitol. 124 (1–2): 79–83. doi:10.1016/S0166-6851(02)00205-0. PMID 12387853.

[Singleton-21] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p Martin Singleton, Mark S. Dillingham, and Dale B. Wigley (2007). "Structure and mechanism of Helicases and Nucleic Acid Translocases". The Annual Review of Biochemistry 76: 23–50. doi:10.1146/annurev.biochem.76.052305.115300. PMID 17506634.

[Fairman-22] Margaret E. Fairman-Williams, Ulf-Peter Guenther and Echard Jankowsky (2010). "SF1 and SF2 helicases: family matters". Current Opinion in Structural Biology 20 (3): 313–324. doi:10.1016/j.sbi.2010.03.011. PMC 2916977. PMID 20456941.

[Umate-23] Pavan Umate, Narendra Tuteja and Renu Tuteja (2011). "Genome-wide comprehensive análisis of human helicases". Communicative & Integrative Biology 4 (1): 118–137. doi:10.4161/cib.4.1.13844. PMC 3073292. PMID 21509200.

[PUB00033628-24] Koonin EV, Aravind L, Iyer LM (2001). "Common origin of four diverse families of large eukaryotic DNA viruses". J. Virol. 75 (23): 11720–34. doi:10.1128/JVI.75.23.11720-11734.2001. PMC 114758. PMID 11689653.

[PUB00014778-25] Koonin EV, Aravind L, Leipe DD, Iyer LM (2004). "Evolutionary history and higher order classification of AAA+ ATPases". J. Struct. Biol. 146 (1–2): 11–31. doi:10.1016/j.jsb.2003.10.010. PMID 15037234.

[ropers-26] Ropers HH, Hamel BC (January 2005). "X-linked mental retardation". Nat. Rev. Genet. 6 (1): 46–57. doi:10.1038/nrg1501. PMID 15630421.

[gibbons-27] Gibbons RJ, Picketts DJ, Villard L, Higgs DR (March 1995). "Mutations in a putative global transcriptional regulator cause X-linked mental retardation with alpha-thalassemia ATR-X syndrome". Cell 80 (6): 837–45. doi:10.1016/0092-8674(95)90287-2. PMID 7697714.

[nextprot-28] Nextrprot Online Protein Database. " ATRX-Transcriptional regulator ATRX.", Retrieved on 12 November 2012.

[picketts-29] Picketts DJ, Higgs DR, Bachoo S, Blake DJ, Quarrell OW, Gibbons RJ (December 1996). "ATRX encodes a novel member of the SNF2 family of proteins: mutations point to a common mechanism underlying the ATR-X syndrome". Hum. Mol. Genet. 5 (12): 1899–907. doi:10.1093/hmg/5.12.1899. PMID 8968741.

[gibbons2006-30] Gibbons R (2006). "Alpha thalassaemia-mental retardation, X linked". Orphanet J Rare Dis 1: 15. doi:10.1186/1750-1172-1-15. PMC 1464382. PMID 16722615.

[pagon-31] Pagon RA, Bird TD, Dolan CR, Stephens K, Adam MP, Stevenson RE (1993). Alpha-Thalassemia X-Linked Intellectual Disability Syndrome. PMID 20301622.

[gibbons1995-32] Gibbons RJ, Picketts DJ, Villard L, Higgs DR (March 1995). "Mutations in a putative global transcriptional regulator cause X-linked mental retardation with alpha-thalassemia (ATR-X syndrome)". Cell 80 (6): 837–45. doi:10.1016/0092-8674(95)90287-2. PMID 7697714.

[singleton-33] Singleton MR, Dillingham MS, Wigley DB (2007). "Structure and mechanism of helicases and nucleic acid translocases". Annu. Rev. Biochem. 76: 23–50. doi:10.1146/annurev.biochem.76.052305.115300. PMID 17506634.

[rudolf-34] Rudolf J, Rouillon C, Schwarz-Linek U, White MF (January 2010). "The helicase XPD unwinds bubble structures and is not stalled by DNA lesions removed by the nucleotide excision repair pathway". Nucleic Acids Res. 38 (3): 931–41. doi:10.1093/nar/gkp1058. PMC 2817471. PMID 19933257.

[fan-35] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o Fan L, Fuss JO, Cheng QJ, Arvai AS, Hammel M, Roberts VA, Cooper PK, Tainer JA (May 2008). "XPD helicase structures and activities: insights into the cancer and aging phenotypes from XPD mutations". Cell 133 (5): 789–800. doi:10.1016/j.cell.2008.04.030. PMC 3055247. PMID 18510924.

[laine-36] Lainé JP, Mocquet V, Egly JM (2006). "TFIIH enzymatic activities in transcription and nucleotide excision repair". Meth. Enzymol. Methods in Enzymology 408: 246–63. doi:10.1016/S0076-6879(06)08015-3. ISBN 9780121828134. PMID 16793373.

[tirode-37] Tirode F, Busso D, Coin F, Egly JM (January 1999). "Reconstitution of the transcription factor TFIIH: assignment of functions for the three enzymatic subunits, XPB, XPD, and cdk7". Mol. Cell 3 (1): 87–95. doi:10.1016/S1097-2765(00)80177-X. PMID 10024882.

[sung-38] Sung P, Bailly V, Weber C, Thompson LH, Prakash L, Prakash S (October 1993). "Human xeroderma pigmentosum group D jean encodes a DNA helicase". Nature 365 (6449): 852–5. doi:10.1038/365852a0. PMID 8413672.

[schaeffer-39] Schaeffer L, Roy R, Humbert S, Moncollin V, Vermeulen W, Hoeijmakers JH, Chambon P, Egly JM (April 1993). "DNA repair helicase: a component of BTF2 (TFIIH) basic transcription factor". Science 260 (5104): 58–63. doi:10.1126/science.8465201. PMID 8465201.

[hanada-40] Hanada K, Hickson ID (September 2007). "Molecular jeanetics of RecQ helicase disorders". Cell. Mol. Life Sci. 64 (17): 2306–22. doi:10.1007/s00018-007-7121-z. PMID 17571213.

[opresko-41] Opresko PL, Cheng WH, Bohr VA (April 2004). "Junction of RecQ helicase biochemistry and human disease". J. Biol. Chem. 279 (18): 18099–102. doi:10.1074/jbc.R300034200. PMID 15023996.

[ouyang-42] Ouyang KJ, Woo LL, Ellis NA (2008). "Homologous recombination and maintenance of genome integrity: cancer and aging through the prism of human RecQ helicases". Mech. Ageing Dev. 129 (7–8): 425–40. doi:10.1016/j.mad.2008.03.003. PMID 18430459.

[ellis-43] Ellis NA, Groden J, Ye TZ, Straughen J, Lennon DJ, Ciocci S, Proytcheva M, German J (November 1995). "The Bloom's syndrome jean product is homologous to RecQ helicases". Cell 83 (4): 655–66. doi:10.1016/0092-8674(95)90105-1. PMID 7585968.

[selak-44] Selak N, Bachrati CZ, Shevelev I, Dietschy T, van Loon B, Jacob A, Hübscher U, Hoheisel JD, Hickson ID, Stagljar I (September 2008). "The Bloom's syndrome helicase (BLM) interacts physically and functionally with p12, the smallest subunit of human DNA polymerase delta". Nucleic Acids Res. 36 (16): 5166–79. doi:10.1093/nar/gkn498. PMC 2532730. PMID 18682526.

[gray-45] Gray MD, Shen JC, Kamath-Loeb AS, Blank A, Sopher BL, Martin GM, Oshima J, Loeb LA (September 1997). "The Werner syndrome protein is a DNA helicase". Nat. Genet. 17 (1): 100–3. doi:10.1038/ng0997-100. PMID 9288107.

[kitao-46] Kitao S, Shimamoto A, Goto M, Miller RW, Smithson WA, Lindor NM, Furuichi Y (May 1999). "Mutations in RECQL4 cause a subset of cases of Rothmund-Thomson syndrome". Nat. Genet. 22 (1): 82–4. doi:10.1038/8788. PMID 10319867.

[rnadatabase-47] Jankowsky, A.; Guenther, U. -P.; Jankowsky, E. (2010). "The RNA helicase database". Nucleic Acids Research 39 (Database issue): D338–D341. doi:10.1093/nar/gkq1002. PMC 3013637. PMID 21112871. edit

[rnavirus-48] Steimer, L.; Klostermeier, D. (2012). "RNA helicases in infection and disease". RNA Biology 9 (6): 751–771. doi:10.4161/rna.20090. PMID 22699555. edit

[isbn1-84755-914-X-49] Jankowsky E, Fairman-Williams ME (2010). "An introduction to RNA helicases: superfamilies, families, and major themes". In Jankowsky E. RNA Helicases (RSC Biomolecular Sciences). Cambridge, England: Royal Society of Chemistry. p. 5. ISBN 1-84755-914-X.

[rnahelicases-50] Ranji, A.; Boris-Lawrie, K. (2010). "RNA helicases: Emerging roles in viral replication and the host innate response". RNA Biology 7 (6): 775–787. doi:10.4161/rna.7.6.14249. PMC 3073335. PMID 21173576. edit

[pmid20813532-51] Jankowsky E (January 2011). "RNA helicases at work: binding and rearranging". Trends Biochem. Sci. 36 (1): 19–29. doi:10.1016/j.tibs.2010.07.008. PMC 3017212. PMID 20813532.

[pmid17964264-52] Yang Q, Del Campo M, Lambowitz AM, Jankowsky E (October 2007). "DEAD-box proteins unwind duplexes by local strand separation". Mol. Cell 28 (2): 253–63. doi:10.1016/j.molcel.2007.08.016. PMID 17964264.

[pmid19088201-53] Liu F, Putnam A, Jankowsky E (December 2008). "ATP hydrolysis is required for DEAD-box protein recycling but not for duplex unwinding". Proc. Natl. Acad. Sci. U.S.A. 105 (51): 20209–14. doi:10.1073/pnas.0811115106. PMC 2629341. PMID 19088201.

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[57] Borowiec, J. (1996) DNA Replication in Eukaryotic Cells. Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY. 545-574

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helicase