Betaine—homocysteine S-methyltransferase
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| betaine-homocysteine S-methyltransferase | |||||||||
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| Lua error in package.lua at line 80: module 'Module:InfoboxImage/data' not found. Crystal structure of rat liver betaine homocysteine s-methyltransferase.[1] | |||||||||
| Identifiers | |||||||||
| EC no. | 2.1.1.5 | ||||||||
| CAS no. | Template:CAS | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| Gene Ontology | AmiGO / QuickGO | ||||||||
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In enzymology, a betaine-homocysteine S-methyltransferase also known as betaine-homocysteine methyltransferase (BHMT) is a zinc metallo-enzyme that catalyzes the transfer of a methyl group from trimethylglycine and a hydrogen ion from homocysteine to produce dimethylglycine and methionine respectively:[2]
BHMT belongs to the family of transferases, specifically those transferring one-carbon group methyltransferases. It participates in the metabolism of glycine, serine, threonine, and methionine.
Isozymes
In humans, there are two isozymes, BHMT[3][4] and BHMT2,[5][6] each encoded by a separate gene.
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Tissue distribution
BHMT is expressed most predominantly in the liver and kidney.[7]
Clinical significance
Mutations in the BHMT gene are known to exist in humans. Anomalies may influence the metabolism of homocysteine, which is implicated in disorders ranging from vascular disease, autism, and schizophrenia to neural tube birth defects such as spina bifida.
See also
References
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- ^ Template:PDB; Page Module:Citation/CS1/styles.css has no content.González B, Pajares MA, Martínez-Ripoll M, Blundell TL, Sanz-Aparicio J (May 2004). "Crystal structure of rat liver betaine homocysteine s-methyltransferase reveals new oligomerization features and conformational changes upon substrate binding". J. Mol. Biol. 338 (4): 771–82. CiteSeerX 10.1.1.320.5080. doi:10.1016/j.jmb.2004.03.005. PMID 15099744.
- ^ Page Module:Citation/CS1/styles.css has no content.Pajares MA, Pérez-Sala D (December 2006). "Betaine homocysteine S-methyltransferase: just a regulator of homocysteine metabolism?". Cell. Mol. Life Sci. 63 (23): 2792–803. doi:10.1007/s00018-006-6249-6. hdl:10261/13799. PMC 11136095. PMID 17086380. S2CID 6076708.
- ^ Page Module:Citation/CS1/styles.css has no content.Garrow TA (September 1996). "Purification, kinetic properties, and cDNA cloning of mammalian betaine-homocysteine methyltransferase". J. Biol. Chem. 271 (37): 22831–8. doi:10.1074/jbc.271.37.22831. PMID 8798461.
- ^ Page Module:Citation/CS1/styles.css has no content.Sunden SL, Renduchintala MS, Park EI, Miklasz SD, Garrow TA (September 1997). "Betaine-homocysteine methyltransferase expression in porcine and human tissues and chromosomal localization of the human gene". Arch. Biochem. Biophys. 345 (1): 171–4. doi:10.1006/abbi.1997.0246. PMID 9281325.
- ^ Page Module:Citation/CS1/styles.css has no content.Chadwick LH, McCandless SE, Silverman GL, Schwartz S, Westaway D, Nadeau JH (November 2000). "Betaine-homocysteine methyltransferase-2: cDNA cloning, gene sequence, physical mapping, and expression of the human and mouse genes". Genomics. 70 (1): 66–73. doi:10.1006/geno.2000.6319. PMID 11087663.
- ^ Page Module:Citation/CS1/styles.css has no content.Szegedi SS, Castro CC, Koutmos M, Garrow TA (April 2008). "Betaine-homocysteine S-methyltransferase-2 is an S-methylmethionine-homocysteine methyltransferase". J. Biol. Chem. 283 (14): 8939–45. doi:10.1074/jbc.M710449200. PMC 2276374. PMID 18230605.
- ^ Page Module:Citation/CS1/styles.css has no content.Sunden SL, Renduchintala MS, Park EI, Miklasz SD, Garrow TA (September 1997). "Betaine-homocysteine methyltransferase expression in porcine and human tissues and chromosomal localization of the human gene". Arch. Biochem. Biophys. 345 (1): 171–4. doi:10.1006/abbi.1997.0246. PMID 9281325.
Further reading
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- Page Module:Citation/CS1/styles.css has no content.Klee WA, Richards HH, Cantoni GL (1961). "The synthesis of methionine by enzymic transmethylation. VII Existence of two separate homocysteine methylpherases on mammalian liver". Biochim. Biophys. Acta. 54: 157–64. doi:10.1016/0006-3002(61)90948-9. PMID 14456704.
External links
- Betaine+Homocysteine+Methyltransferase at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
- EC 2.1.1.5
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