This article is about the ATM protein. For the ATM cell type, see adipose tissue macrophages.
ATM serine/threonine kinase |
Identifiers |
Symbols |
ATM ; AT1; ATA; ATC; ATD; ATDC; ATE; TEL1; TELO1 |
External IDs |
OMIM: 607585 HomoloGene: 30952 ChEMBL: 3797 GeneCards: ATM Gene |
EC number |
2.7.11.1 |
Gene ontology |
Molecular function |
• DNA binding
• protein serine/threonine kinase activity
• DNA-dependent protein kinase activity
• protein binding
• ATP binding
• 1-phosphatidylinositol-3-kinase activity
• protein complex binding
• histone serine kinase activity
• protein dimerization activity
• protein N-terminus binding
|
Cellular component |
• chromosome, telomeric region
• nucleoplasm
• spindle
• cytoplasmic membrane-bounded vesicle
|
Biological process |
• telomere maintenance
• double-strand break repair via homologous recombination
• response to hypoxia
• somitogenesis
• pre-B cell allelic exclusion
• DNA repair
• double-strand break repair
• protein phosphorylation
• cellular response to DNA damage stimulus
• DNA damage induced protein phosphorylation
• DNA damage response, signal transduction by p53 class mediator resulting in cell cycle arrest
• cell cycle arrest
• mitotic spindle assembly checkpoint
• reciprocal meiotic recombination
• signal transduction
• brain development
• heart development
• determination of adult lifespan
• intrinsic apoptotic signaling pathway in response to DNA damage
• response to ionizing radiation
• peptidyl-serine phosphorylation
• negative regulation of B cell proliferation
• V(D)J recombination
• cellular response to heat
• histone-serine phosphorylation
• phosphatidylinositol-3-phosphate biosynthetic process
• lipoprotein catabolic process
• positive regulation of apoptotic process
• positive regulation of DNA damage response, signal transduction by p53 class mediator
• positive regulation of neuron apoptotic process
• protein autophosphorylation
• oocyte development
• neuron apoptotic process
• histone mRNA catabolic process
• cellular response to gamma radiation
• signal transduction involved in mitotic G2 DNA damage checkpoint
• replicative senescence
• regulation of cellular response to heat
|
Sources: Amigo / QuickGO |
|
Orthologs |
Species |
Human |
Mouse |
Entrez |
472 |
11920 |
Ensembl |
ENSG00000149311 |
ENSMUSG00000034218 |
UniProt |
Q13315 |
Q62388 |
RefSeq (mRNA) |
NM_000051 |
NM_007499 |
RefSeq (protein) |
NP_000042 |
NP_031525 |
Location (UCSC) |
Chr 11:
108.22 – 108.37 Mb |
Chr 9:
53.44 – 53.54 Mb |
PubMed search |
[1] |
[2] |
|
Ataxia telangiectasia mutated (ATM) is a serine/threonine protein kinase that is recruited and activated by DNA double-strand breaks. It phosphorylates several key proteins that initiate activation of the DNA damage checkpoint, leading to cell cycle arrest, DNA repair or apoptosis. Several of these targets, including p53, CHK2, BRCA1, NBS1 and H2AX are tumor suppressors.
The protein is named for the disorder ataxia telangiectasia caused by mutations of ATM.[1]
Contents
- 1 Introduction
- 2 Structure
- 3 Function
- 4 Regulation
- 5 Role in cancer
- 6 ATM mutation frequencies in sporadic cancers
- 7 Frequent epigenetic deficiencies of ATM in cancers
- 8 Meiosis
- 9 Interactions
- 10 See also
- 11 References
- 12 Further reading
- 13 External links
Introduction
Throughout the cell cycle the DNA is monitored for damage. Damages result from errors during replication, by-products of metabolism, general toxic drugs or ionizing radiation. The cell cycle has different DNA damage checkpoints, which inhibit the next or maintain the current cell cycle step. There are two main checkpoints, the G1/S and the G2/M, during the cell cycle, which preserve correct progression. ATM plays a role in cell cycle delay after DNA damage, especially after double-strand breaks (DSBs).[2] ATM together with NBS1 act as primary DSB sensor proteins. Different mediators, such as Mre11 and MDC1, acquire post-translational modifications which are generated by the sensor proteins. These modified mediator proteins then amplify the DNA damage signal, and transduce the signals to downstream effectors such as CHK2 and p53.
Structure
The ATM gene codes for a 350 kDa protein consisting of 3056 amino acids.[3] ATM belongs to the superfamily of phosphatidylinositol 3-kinase-related kinases (PIKKs). The PIKK superfamily comprises six Ser/Thr-protein kinases that show a sequence similarity to phosphatidylinositol 3-kinases (PI3Ks). This protein kinase family includes amongst others ATR (ATM- and RAD3-related), DNA-PKcs (DNA-dependent protein kinase catalytic subunit) and mTOR (mammalian target of rapamycin). Characteristic for ATM are five domains. These are from N-Terminus to C-Terminus the HEAT repeat domain, the FRAP-ATM-TRRAP (FAT) domain, the kinase domain (KD), the PIKK-regulatory domain (PRD) and the FAT-C-terminal (FATC) domain. The HEAT repeats directly bind to the C-terminus of NBS1. The FAT domain interacts with ATM's kinase domain to stabilize the C-terminus region of ATM itself. The KD domain resumes kinase activity, while the PRD and the FATC domain regulate it. Although no structure for ATM has been solved, the overall shape of ATM is very similar to DNA-PKcs and is composed of a head and a long arm that is thought to wrap around double-stranded DNA after a conformational change. The entire N-terminal domain together with the FAT domain are predicted to adopt an α-helical structure, which was found by sequence analysis. This α-helical structure is believed to form a tertiary structure, which has a curved, tubular shape present for example in the Huntingtin protein, which also contains HEAT repeats. FATC is the C-terminal domain with a length of about 30 amino acids. It is highly conserved and consists of an α-helix followed by a sharp turn, which is stabilized by a disulfide bond.[4]
Schematic illustration of the four known conserved domains in four members of the PIKKs family.
[4]
Function
A complex of the three proteins MRE11, RAD50 and NBS1 (XRS2 in yeast), called the MRN complex in humans, recruits ATM to double strand breaks (DSBs) and holds the two ends together. ATM directly interacts with the NBS1 subunit and phosphorylates the histone variant H2AX on Ser139.[5] This phosphorylation generates binding sites for adaptor proteins with a BRCT domain. These adaptor proteins then recruit different factors including the effector protein kinase CHK2 and the tumor suppressor p53. The ATM-mediated DNA damage response consists of a rapid and a delayed response. The effector kinase CHK2 is phosphorylated and thereby activated by ATM. Activated CHK2 phosphorylates phosphatase CDC25A, which is degraded thereupon and can no longer dephosphorylate CDK2-Cyclin, resulting in cell-cycle arrest. If the DSB can not be repaired during this rapid response, ATM additionally phosphorylates MDM2 and p53 at Ser15.[6] p53 is also phosphorylated by the effector kinase CHK2. These phosphorylation events lead to stabilization and activation of p53 and subsequent transcription of numerous p53 target genes including CDK inhibitor p21 which lead to long-term cell-cycle arrest or even apoptosis.[7]
ATM-mediated two-step response to DNA double strand breaks. In the rapid response activated ATM phosphorylates effector kinase CHK2 which phophphorylates CDC25A, targeting it for ubiquitination and degradation. Therefore, phosphorylated CDK2-Cyclin accumulates and progression through the cell cycle is blocked. In the delayed response ATM phosphorylates the inhibitor of p53, MDM2, and p53, which is also phosphorylated by Chk2. The resulting activation and stabilization of p53 leads to an increased expression of Cdk inhibitor p21, which further helps to keep Cdk activity low and to maintain long-term cell cycle arrest.
[7]
The protein kinase ATM may also be involved in mitochondrial homeostasis, as a regulator of mitochondrial autophagy (mitophagy) whereby old, dysfunctional mitochondria are removed.[8]
Regulation
A functional MRN complex is required for ATM activation after double strand breaks (DSBs). The complex functions upstream of ATM in mammalian cells and induces conformational changes that facilitate an increase in the affinity of ATM towards its substrates, such as CHK2 and p53.[2] Inactive ATM is present in the cells without DSBs as dimers or multimers. Upon DNA damage, ATM autophosphorylates on residue Ser1981. This phosphorylation provokes dissociation of ATM dimers, which is followed by the release of active ATM monomers.[9] Further autophosphorylation (of residues Ser367 and Ser1893) is required for normal activity of the ATM kinase. Activation of ATM by the MRN complex is preceded by at least two steps, i.e. recruitment of ATM to DSB ends by the mediator of DNA damage checkpoint protein 1 (MDC1) which binds to MRE11, and the subsequent stimulation of kinase activity with the NBS1 C-terminus. The three domains FAT, PRD and FATC are all involved in regulating the activity of the KD kinase domain. The FAT domain interacts with ATM's KD domain to stabilize the C-terminus region of ATM itself. The FATC domain is critical for kinase activity and highly sensitive to mutagenesis. It mediates protein-protein interaction for example with the histone acetyltransferase TIP60 (HIV-1 Tat interacting protein 60 kDa), which acetylates ATM on residue Lys3016. The acetylation occurs in the C-terminal half of the PRD domain and is required for ATM kinase activation and for its conversion into monomers. While deletion of the entire PRD domain abolishes the kinase activity of ATM, specific small deletions show no effect.[4]
Role in cancer
Ataxia telangiectasia (AT) is a rare human disease characterized by cerebellar degeneration, extreme cellular sensitivity to radiation and a predisposition to cancer. All AT patients contain mutations in the ATM gene (ATM). Most other AT-like disorders are defective in genes encoding the MRN protein complex. One feature of the ATM protein is its rapid increase in kinase activity immediately following double-strand break formation.[10][11] The phenotypic manifestation of AT is due to the broad range of substrates for the ATM kinase, involving DNA repair, apoptosis, G1/S, intra-S checkpoint and G2/M checkpoints, gene regulation, translation initiation, and telomere maintenance.[12] Therefore, a defect in ATM has severe consequences in repairing certain types of damage to DNA, and cancer may result from improper repair. AT patients have an increased risk for breast cancer that has been ascribed to ATM's interaction and phosphorylation of BRCA1 and its associated proteins following DNA damage.[13] Certain kinds of leukemias and lymphomas, including Mantle cell lymphoma, T-ALL, atypical B cell chronic lymphocytic leukemia, and T-PLL are also associated with ATM defects.[14]
ATM mutation frequencies in sporadic cancers
Mutations in the ATM gene are found at relatively low frequencies in sporadic cancers. According to COSMIC, the Catalogue Of Somatic Mutations In Cancer, the frequencies with which heterozygous mutations in ATM are found in common cancers include 0.7% in 713 ovarian cancers, 0.9% in central nervous system cancers, 1.9% in 1,120 breast cancers, 2.1% in 847 kidney cancers, 4.6% in colon cancers, 7.2% among 1,040 lung cancers and 11.1% in 1790 hematopoetic and lymphoid tissue cancers.[15]
Frequent epigenetic deficiencies of ATM in cancers
ATM is one of the DNA repair genes frequently hypermethylated in its promoter region in various cancers (see table of such genes in Cancer epigenetics). The promoter methylation of ATM causes reduced protein or mRNA expression of ATM.
More than 73% of brain tumors were found to be methylated in the ATM gene promoter and there was strong inverse correlation between ATM promoter methylation and its protein expression (p < 0.001).[16]
The ATM gene promoter was observed to be hypermethylated in 53% of small (impalpable) breast cancers[17] and was hypermethylated in 78% of stage II or greater breast cancers with a highly significant correlation (P = 0.0006) between reduced ATM mRNA abundance and aberrant methylation of the ATM gene promoter.[18]
In non-small cell lung cancer (NSCLC), the ATM promoter methylation status of paired tumors and surrounding histologically uninvolved lung tissue was found to be 69% and 59%, respectively. However, in more advanced NSCLC the frequency of ATM promoter methylation was lower at 22%.[19] The finding of ATM promoter methylation in surrounding histologically uninvolved lung tissue suggests that ATM deficiency may be present early in a field defect leading to progression to NSCLC.
In squamous cell carcinoma of the head and neck, 42% of tumors displayed ATM promoter methylation.[20]
DNA damage appears to be the primary underlying cause of cancer,[21][22] and deficiencies in DNA repair likely underlie many forms of cancer.[23] If DNA repair is deficient, DNA damage tends to accumulate. Such excess DNA damage may increase mutational errors during DNA replication due to error-prone translesion synthesis. Excess DNA damage may also increase epigenetic alterations due to errors during DNA repair.[24][25] Such mutations and epigenetic alterations may give rise to cancer. The frequent epigenetic deficiency of ATM in a number of cancers likely contributed to the progression of those cancers.
Meiosis
ATM functions during meiotic prophase.[26] The wild-type ATM gene is expressed at a 4-fold increased level in human testes compared to somatic cells (such as skin fibroblasts).[27] In both mice and humans, ATM deficiency results in female and male infertility. Deficient ATM expression causes severe meiotic disruption during prophase I.[28] In addition, impaired ATM-mediated DNA double-strand break (DSB) repair has been identified as a likely cause of aging of mouse and human oocytes.[29] Expression of the ATM gene, as well as other key DSB repair genes, declines with age in mouse and human oocytes and this decline is paralleled by an increase of DSBs in primordial follicles.[29] These findings indicate that ATM-mediated homologous recombinational repair is a crucial function of meiosis.
Interactions
Ataxia telangiectasia mutated has been shown to interact with:
- Abl gene,[30][31][32]
- BRCA1,[13][33][34][35][36][37][38]
- Bloom syndrome protein,[34][39]
- DNA-PKcs,[33][40]
- FANCD2,[41][42]
- MRE11A,[33][34]
- Nibrin,[33][34]
- P53,[33][43][44][45][46]
- RAD17,[33][47]
- RAD51,[30]
- RBBP8,[33][48]
- RHEB,[49]
- RRM2B,[50]
- SMC1A[51]
- TERF1,[31] and
- TP53BP1.[52][53]
See also
- DNA repair
- Ataxia telangiectasia
- Ataxia telangiectasia and Rad3 related
References
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- ^ Kim ST, Xu B, Kastan MB (March 2002). "Involvement of the cohesin protein, Smc1, in Atm-dependent and independent responses to DNA damage". Genes Dev. 16 (5): 560–70. doi:10.1101/gad.970602. PMC 155347. PMID 11877376.
- ^ Fernandez-Capetillo O, Chen HT, Celeste A, Ward I, Romanienko PJ, Morales JC, Naka K, Xia Z, Camerini-Otero RD, Motoyama N, Carpenter PB, Bonner WM, Chen J, Nussenzweig A (Dec 2002). "DNA damage-induced G2-M checkpoint activation by histone H2AX and 53BP1". Nat. Cell Biol. 4 (12): 993–7. doi:10.1038/ncb884. PMID 12447390.
- ^ Ward IM, Minn K, Jorda KG, Chen J (May 2003). "Accumulation of checkpoint protein 53BP1 at DNA breaks involves its binding to phosphorylated histone H2AX". J. Biol. Chem. 278 (22): 19579–82. doi:10.1074/jbc.C300117200. PMID 12697768.
Further reading
- Giaccia AJ, Kastan MB (1998). "The complexity of p53 modulation: emerging patterns from divergent signals". Genes Dev. 12 (19): 2973–83. doi:10.1101/gad.12.19.2973. PMID 9765199.
- Jef Akst (2015). "Another Telomere-Regulating Enzyme Found". The Scientist (November 12).
- Kastan MB, Lim DS (2001). "The many substrates and functions of ATM". Nature Reviews Molecular Cell Biology 1 (3): 179–86. doi:10.1038/35043058. PMID 11252893.
- Shiloh Y (2002). "ATM: from phenotype to functional genomics--and back". Ernst Schering Res. Found. Workshop (36): 51–70. PMID 11859564.
- Redon C, Pilch D, Rogakou E, Sedelnikova O, Newrock K, Bonner W (2002). "Histone H2A variants H2AX and H2AZ". Current Opinion in Genetics & Development 12 (2): 162–9. doi:10.1016/S0959-437X(02)00282-4. PMID 11893489.
- Tang Y (2003). "[ATM and Cancer]". Zhongguo Shi Yan Xue Ye Xue Za Zhi 10 (1): 77–80. PMID 12513844.
- Shiloh Y (2003). "ATM and related protein kinases: safeguarding genome integrity". Nature Reviews Cancer 3 (3): 155–68. doi:10.1038/nrc1011. PMID 12612651.
- Gumy-Pause F, Wacker P, Sappino AP (2004). "ATM gene and lymphoid malignancies". Leukemia 18 (2): 238–42. doi:10.1038/sj.leu.2403221. PMID 14628072.
- Kurz EU, Lees-Miller SP (2005). "DNA damage-induced activation of ATM and ATM-dependent signaling pathways". DNA Repair (Amst.) 3 (8–9): 889–900. doi:10.1016/j.dnarep.2004.03.029. PMID 15279774.
- Abraham RT (2005). "The ATM-related kinase, hSMG-1, bridges genome and RNA surveillance pathways". DNA Repair (Amst.) 3 (8–9): 919–25. doi:10.1016/j.dnarep.2004.04.003. PMID 15279777.
- Lavin MF, Scott S, Gueven N, Kozlov S, Peng C, Chen P (2005). "Functional consequences of sequence alterations in the ATM gene". DNA Repair (Amst.) 3 (8–9): 1197–205. doi:10.1016/j.dnarep.2004.03.011. PMID 15279808.
- Meulmeester E, Pereg Y, Shiloh Y, Jochemsen AG (2006). "ATM-mediated phosphorylations inhibit Mdmx/Mdm2 stabilization by HAUSP in favor of p53 activation". Cell Cycle 4 (9): 1166–70. doi:10.4161/cc.4.9.1981. PMID 16082221.
- Ahmed M, Rahman N (2006). "ATM and breast cancer susceptibility". Oncogene 25 (43): 5906–11. doi:10.1038/sj.onc.1209873. PMID 16998505.
External links
- http://www.hprd.org/protein/06347
- Drosophila telomere fusion - The Interactive Fly
- GeneReviews/NCBI/NIH/UW entry on Ataxia telangiectasia
- OMIM entries on Ataxia telangiectasia
Kinases: Serine/threonine-specific protein kinases (EC 2.7.11-12)
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Serine/threonine-specific protein kinases (EC 2.7.11.1-EC 2.7.11.20)
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Serine/threonine-specific protein kinases (EC 2.7.11.21-EC 2.7.11.30)
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Polo kinase (EC 2.7.11.21) |
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Cyclin-dependent kinase (EC 2.7.11.22) |
- CDK1
- CDK2
- CDKL2
- CDK3
- CDK4
- CDK5
- CDKL5
- CDK6
- CDK7
- CDK8
- CDK9
- CDK10
- CDK12
- CDC2L5
- PCTK1
- PCTK2
- PCTK3
- PFTK1
- CDC2L1
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(RNA-polymerase)-subunit kinase (EC 2.7.11.23) |
- RPS6KA5
- RPS6KA4
- P70S6 kinase
- P70-S6 Kinase 1
- RPS6KB2
- RPS6KA2
- RPS6KA3
- RPS6KA1
- RPS6KC1
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Mitogen-activated protein kinase (EC 2.7.11.24) |
- Extracellular signal-regulated
- MAPK1
- MAPK3
- MAPK4
- MAPK6
- MAPK7
- MAPK12
- MAPK15
- C-Jun N-terminal
- P38 mitogen-activated protein
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MAP3K (EC 2.7.11.25) |
- MAP kinase kinase kinases
- MAP3K1
- MAP3K2
- MAP3K3
- MAP3K4
- MAP3K5
- MAP3K6
- MAP3K7
- MAP3K8
- RAFs
- MLKs
- MAP3K12
- MAP3K13
- MAP3K9
- MAP3K10
- MAP3K11
- MAP3K7
- ZAK
- CDC7
- MAP3K14
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Tau-protein kinase (EC 2.7.11.26) |
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(acetyl-CoA carboxylase) kinase (EC 2.7.11.27) |
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Tropomyosin kinase (EC 2.7.11.28) |
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Low-density-lipoprotein receptor kinase (EC 2.7.11.29) |
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Receptor protein serine/threonine kinase (EC 2.7.11.30) |
- Bone morphogenetic protein receptors
- BMPR1
- BMPR1A
- BMPR1B
- BMPR2
- ACVR1
- ACVR1B
- ACVR1C
- ACVR2A
- ACVR2B
- ACVRL1
- Anti-Müllerian hormone receptor
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Dual-specificity kinases (EC 2.7.12)
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MAP2K |
- MAP2K1
- MAP2K2
- MAP2K3
- MAP2K4
- MAP2K5
- MAP2K6
- MAP2K7
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Proteins: enzymes
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Activity |
- Active site
- Binding site
- Catalytic triad
- Oxyanion hole
- Enzyme promiscuity
- Catalytically perfect enzyme
- Coenzyme
- Cofactor
- Enzyme catalysis
- Enzyme kinetics
- Lineweaver–Burk plot
- Michaelis–Menten kinetics
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Regulation |
- Allosteric regulation
- Cooperativity
- Enzyme inhibitor
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Classification |
- EC number
- Enzyme superfamily
- Enzyme family
- List of enzymes
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Types |
- EC1 Oxidoreductases(list)
- EC2 Transferases(list)
- EC3 Hydrolases(list)
- EC4 Lyases(list)
- EC5 Isomerases(list)
- EC6 Ligases(list)
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