Guanidinoacetate N-methyltransferase

Guanidinoacetate N-methyltransferase (EC 2.1.1.2) is an enzyme that is encoded by gene GAMT located on chromosome 19p13.3 and catalyzes the chemical reaction:

GAMT
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 3ORH
Identifiers
Aliases	GAMT, CCDS2, HEL-S-20, PIG2, TP53I2, guanidinoacetate N-methyltransferase
External IDs	OMIM: 601240; MGI: 1098221; HomoloGene: 32089; GeneCards: GAMT; OMA:GAMT - orthologs
Gene location (Human) Chr. Chromosome 19 (human) Band 19p13.3 Start 1,397,026 bp End 1,401,570 bp
Gene location (Mouse) Chr. Chromosome 10 (mouse) Band 10 C1|10 39.72 cM Start 80,093,985 bp End 80,096,846 bp
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in muscle of thigh right lobe of liver gastrocnemius muscle Skeletal muscle tissue of rectus abdominis triceps brachii muscle vastus lateralis muscle glutes thoracic diaphragm biceps brachii Skeletal muscle tissue of biceps brachii Top expressed in left lobe of liver adrenal gland yolk sac gallbladder right kidney muscle of thigh esophagus triceps brachii muscle proximal tubule temporal muscle More reference expression data BioGPS More reference expression data
Gene ontology Molecular function methyltransferase activity transferase activity guanidinoacetate N-methyltransferase activity S-adenosylmethionine-dependent methyltransferase activity Cellular component cytoplasm cytosol nucleus Biological process muscle contraction regulation of multicellular organism growth methylation spermatogenesis animal organ morphogenesis creatine metabolic process creatine biosynthetic process S-adenosylhomocysteine metabolic process S-adenosylmethionine metabolic process Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 2593 14431 Ensembl ENSG00000130005 ENSMUSG00000020150 UniProt Q14353 O35969 RefSeq (mRNA) NM_138924 NM_000156 NM_010255 NM_001347119 RefSeq (protein) NP_000147 NP_620279 NP_001334048 NP_034385 Location (UCSC) Chr 19: 1.4 – 1.4 Mb Chr 10: 80.09 – 80.1 Mb PubMed search
Wikidata
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guanidinoacetate N-methyltransferase
Identifiers
EC no.	2.1.1.2
CAS no.	9029-75-8
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
Search PMC articles PubMed articles NCBI proteins

glycocyamine

+ SAM

 

 

 

 

 

 

 

creatine

+ SAH

 

This is a methylation reaction in which glycocyamine is converted to creatine. The methyl group comes from the cofactor, S-adenosyl methionine (SAM), which loses its methyl group and becomes S-adenosyl-L-homocysteine (SAH).

This enzyme belongs to the family of transferases, specifically those transferring one-carbon group methyltransferases. The systematic name of this enzyme class is S-adenosyl-L-methionine:N-guanidinoacetate methyltransferase. Other names in common use include GA methylpherase, guanidinoacetate methyltransferase, guanidinoacetate transmethylase, methionine-guanidinoacetic transmethylase, and guanidoacetate methyltransferase. It participates in the metabolism of amino acids.

Defects in the gene which encodes this protein have been implicated in neurologic syndromes and muscular hypotonia, probably due to creatine deficiency and accumulation of guanidinoacetate in the brain of affected individuals. Two transcript variants encoding different isoforms have been described for this gene.

Structural studies

As of late 2007, 7 structures have been solved for this class of enzymes, with PDB accession codes 1KHH, 1P1B, 1P1C, 1XCJ, 1XCL, 1ZX0, and 2BLN.

See also

• Guanidinoacetate methyltransferase deficiency

Further reading

• Almeida LS, Vilarinho L, Darmin PS, et al. (2007). "A prevalent pathogenic GAMT mutation (c.59G>C) in Portugal". Mol. Genet. Metab. 91 (1): 1–6. doi:10.1016/j.ymgme.2007.01.005. PMID 17336114.
• Morris AA, Appleton RE, Power B, et al. (2007). "Guanidinoacetate methyltransferase deficiency masquerading as a mitochondrial encephalopathy". J. Inherit. Metab. Dis. 30 (1): 100. doi:10.1007/s10545-006-0478-2. PMID 17171576. S2CID 20768084.
• Almeida LS, Rosenberg EH, Martinez-Muñoz C, et al. (2007). "Overexpression of GAMT restores GAMT activity in primary GAMT-deficient fibroblasts". Mol. Genet. Metab. 89 (4): 392–4. doi:10.1016/j.ymgme.2006.06.006. PMID 16899382.
• Gerhard DS, Wagner L, Feingold EA, et al. (2004). "The Status, Quality, and Expansion of the NIH Full-Length cDNA Project: The Mammalian Gene Collection (MGC)". Genome Res. 14 (10B): 2121–7. doi:10.1101/gr.2596504. PMC 528928. PMID 15489334.
• Grimwood J, Gordon LA, Olsen A, et al. (2004). "The DNA sequence and biology of human chromosome 19". Nature. 428 (6982): 529–35. Bibcode:2004Natur.428..529G. doi:10.1038/nature02399. PMID 15057824.
• Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. Bibcode:2002PNAS...9916899M. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932.
• Komoto J, Huang Y, Hu Y, et al. (2000). "Crystallization and preliminary x-ray diffraction studies of guanidinoacetate methyltransferase from rat liver" (PDF). Acta Crystallogr. D. 55 (Pt 11): 1928–9. doi:10.1107/S0907444999010318. hdl:1808/17175. PMID 10531498.
• Polyak K, Xia Y, Zweier JL, et al. (1997). "A model for p53-induced apoptosis". Nature. 389 (6648): 300–5. Bibcode:1997Natur.389..300P. doi:10.1038/38525. PMID 9305847. S2CID 4429638.
• Isbrandt D, von Figura K (1996). "Cloning and sequence analysis of human guanidinoacetate N-methyltransferase cDNA". Biochim. Biophys. Acta. 1264 (3): 265–7. doi:10.1016/0167-4781(95)00184-0. PMID 8547310.

External links

• PDBe-KB provides an overview of all the structure information available in the PDB for Human Guanidinoacetate N-methyltransferase