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Sialic acid is a generic term for the N- or O-substituted derivatives of neuraminic acid, a monosaccharide with a nine-carbon backbone.^[1] It is also the name for the most common member of this group, N-acetylneuraminic acid (Neu5Ac or NANA). Sialic acids are found widely distributed in animal tissues and to a lesser extent in other organisms, ranging from plants and fungi to yeasts and bacteria, mostly in glycoproteins and gangliosides. In general, the amino group bears either an acetyl or a glycolyl group, but other modifications have been described. The hydroxyl substituents may vary considerably; acetyl, lactyl, methyl, sulfate, and phosphate groups have been found.^[2] The term "sialic acid" (from the Greek for saliva, σίαλον/sialon) was first introduced by Swedish biochemist Gunnar Blix in 1952.

Structure[edit source | edit]

The numbering of the sialic acid structure begins at the carboxylate carbon and continues around the chain. The configuration that places the carboxylate in the axial position is the alpha-anomer.

The alpha-anomer is the form that is found when sialic acid is bound to glycans. However, in solution, it is mainly (over 90%) in the beta-anomeric form. A bacterial enzyme with sialic acid mutarotase activity, NanM, that is able to rapidly equilibrate solutions of sialic acid to the resting equilibrium position of around 90% beta/10% alpha has been discovered.^[3]

Biosynthesis[edit source | edit]

In bacterial systems, sialic acids are biosynthesized by an aldolase enzyme. The enzyme uses a mannose derivative as a substrate, inserting three carbons from pyruvate into the resulting sialic acid structure. These enzymes can be used for chemoenzymatic synthesis of sialic acid derivatives.^[4]

Function[edit source | edit]

Sialic acid-rich glycoproteins (sialoglycoproteins) bind selectin in humans and other organisms. Metastatic cancer cells often express a high density of sialic acid-rich glycoproteins. This overexpression of sialic acid on surfaces creates a negative charge on cell membranes. This creates repulsion between cells (cell opposition)^[5] and helps these late-stage cancer cells enter the blood stream.

Sialic acid also plays an important role in human influenza infections. The influenza viruses (Orthomyxoviridae) have hemagglutinin activity (HA) glycoproteins on their surfaces that bind to sialic acids found on the surface of human erythrocytes and on the cell membranes of the upper respiratory tract. This is the basis of hemagglutination when viruses are mixed with blood cells, and entry of the virus into cells of the upper respiratory tract. Widely-used anti-influenza drugs (oseltamivir and zanamivir) are sialic acid analogs that interfere with release of newly generated viruses from infected cells by inhibiting the viral enzyme neuraminidase.

Many bacteria also use sialic acid in their biology, although this is usually limited to bacteria that live in association with higher animals (deuterostomes). Many of these incorporate sialic acid into cell surface features like their lipopolysaccharide and capsule, which helps them evade the innate immune response of the host.^[6] Other bacteria simply use sialic acid as a good nutrient source, as it contains both carbon and nitrogen and can be converted to fructose-6-phosphate, which can then enter central metabolism.

Sialic acid-rich oligosaccharides on the glycoconjugates (glycolipids, glycoproteins, proteoglycans) found on surface membranes help keep water at the surface of cells^{[citation needed]}. The sialic acid-rich regions contribute to creating a negative charge on the cells' surfaces. Since water is a polar molecule with partial positive charges on both hydrogen atoms, it is attracted to cell surfaces and membranes. This also contributes to cellular fluid uptake.

Sialic acid can "hide" mannose antigens on the surface of host cells or bacteria from mannose-binding lectin.^{[citation needed]} This prevents activation of complement.

Sialic acid in the form of polysialic acid is an unusual posttranslational modification that occurs on the neural cell adhesion molecules (NCAMs). In the synapse, the strong negative charge of the polysialic acid prevents NCAM cross-linking of cells.

References[edit source | edit]

^ Varki, Ajit; Roland Schauer (2008). in Essentials of Glycobiology. Cold Spring Harbor Press. pp. Ch. 14.
^ Schauer R. (2000). "Achievements and challenges of sialic acid research". Glycoconj. J. 17 (7–9): 485–499. doi:10.1023/A:1011062223612. PMID 11421344.
^ Severi E, Müller A, Potts JR, Leech A, Williamson D, Wilson KS, Thomas GH (2008). "Sialic acid mutarotation is catalyzed by the Escherichia coli beta-propeller protein YjhT". J Biol Chem 283 (8): 4841–91. PMID 18063573.
^ Hai Yu, Harshal Chokhawala, Shengshu Huang, and Xi Chen (2006). "One-pot three-enzyme chemoenzymatic approach to the synthesis of sialosides containing natural and non-natural functionalities". Nature Protocols 1 (5): 2485–2492. doi:10.1038/nprot.2006.401. PMC 2586341. PMID 17406495.
^ Fuster, Mark M.; Esko, Jeffrey D. (2005). "The sweet and sour of cancer: Glycans as novel therapeutic targets". Nature Reviews Cancer 5 (7): 526–42. doi:10.1038/nrc1649. PMID 16069816.
^ Severi E., Hood D.W., Thomas G.H. (2007). "Sialic acid utilization by bacterial pathogens". Microbiology 153 (9): 2817–2822. PMID 17768226.

External links[edit source | edit]

Sialic acid in evolution

English Journal

M89V Sialic acid Acetyl Esterase (SIAE) and all other non-synonymous common variants of this gene are catalytically normal.

Chellappa V, Taylor KN, Pedrick K, Donado C, Netravali IA, Haider K, Cariappa A, Dalomba NF, Pillai S.SourceMassachusetts General Hospital Cancer Center, Harvard Medical School, Boston, Massachusetts, United States of America.
PloS one.PLoS One.2013;8(1):e53453. doi: 10.1371/journal.pone.0053453. Epub 2013 Jan 7.
Catalytically defective rare variants of Sialic acid Acetyl Esterase (SIAE) have previously been linked to autoimmunity. Studies presented here confirm that the M89V SIAE protein and all other products of common variant alleles of SIAE are catalytically normal. Although overexpressing transfected no
PMID 23308225

The role of functionally defective rare germline variants of sialic acid acetylesterase in autoimmune Addison's disease.

Gan EH, MacArthur K, Mitchell AL, Pearce SH.SourceInstitute of Genetic Medicine, International Centre for Life, Newcastle University, Central Parkway, Newcastle upon Tyne NE1 3BZ, UK. earn.gan@ncl.ac.uk
European journal of endocrinology / European Federation of Endocrine Societies.Eur J Endocrinol.2012 Dec;167(6):825-8. doi: 10.1530/EJE-12-0579. Epub 2012 Sep 25.
BACKGROUND: Autoimmune Addison's disease (AAD) is a rare condition with a complex genetic basis. A panel of rare and functionally defective genetic variants in the sialic acid acetylesterase (SIAE) gene has recently been implicated in several common autoimmune conditions. We performed a case-control
PMID 23011869

Association of primary biliary cirrhosis with variants in the CLEC16A, SOCS1, SPIB and SIAE immunomodulatory genes.

Hirschfield GM, Xie G, Lu E, Sun Y, Juran BD, Chellappa V, Coltescu C, Mason AL, Milkiewicz P, Myers RP, Odin JA, Luketic VA, Bacon B, Bodenheimer H, Liakina V, Vincent C, Levy C, Pillai S, Lazaridis KN, Amos CI, Siminovitch KA.SourceLiver Centre, Toronto Western Hospital, Toronto, Ontario, Canada.
Genes and immunity.Genes Immun.2012 Jun;13(4):328-35. doi: 10.1038/gene.2011.89. Epub 2012 Jan 19.
We fine mapped two primary biliary cirrhosis (PBC) risk loci, CLEC16A (C-type lectin domain family 16 member A)-suppressor of cytokine signaling 1 (SOCS1) and Spi-B protein (SPIB) and sequenced a locus, sialic acid acetylesterase (SIAE), proposed to harbor autoimmunity-associated mutations. In all,
PMID 22257840

Japanese Journal

The sialate pyruvate-lyase from pig kidney: purification, properties and genetic relationship

SOMMER U.
Glycoconj. J. 16, 425-435, 1999
NAID 30012305458

Characterization of the Enzymatic 7-O-Acetylation of Sialic Acids and Evidence for Enzymatic O-Acety Migration from C-7 to C-9 in Bovine Submandibular Gland

Vandamme-Feldhaus Valerie,Schauer Roland
The journal of biochemistry 124(1), 111-121, 1998-07-01
NAID 10005847099

Characterization of the Enzymatic 7-O-Acetylation of Sialic Acids and Evidence for Enzymatic O-Acetyl Migration from C-7 to C-9 in Bovine Submandibular Gland.

,
The Journal of Biochemistry 124(1), 111-121, 1998
Microsomes prepared from bovine submandibular glands incubated with radioactive AcCoA incorporated acid-insoluble radioactivity, which was dependent on time, and the concentrations of AcCoA and protei …
NAID 130003417779

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