GAMT
Guanidinoacetatna N-metiltransferaza (EC 2.1.1.2) je enzim koji katalizira hemijsku reakciju, a kodiran je genom GAMT, koji se nalazi na hromosomu 19, pozicija 19p13.3.[5]
| Guanidinoacetatna N-metiltransferaza | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifikatori | |||||||||
| EC broj | 2.1.1.2 | ||||||||
| CAS broj | 9029-75-8 | ||||||||
| Baze podataka | |||||||||
| IntEnz | IntEnz pregled | ||||||||
| BRENDA | BRENDA unos | ||||||||
| ExPASy | NiceZyme pregled | ||||||||
| KEGG | KEGG unos | ||||||||
| MetaCyc | metabolički put | ||||||||
| PRIAM | profil | ||||||||
| PDB strukture | RCSB PDB PDBj PDBe PDBsum | ||||||||
| Ontologija gena | AmiGO / QuickGO | ||||||||
| |||||||||
- S-adenozil-L-metionin + gvanidinoacetat S-adenozil-L-homocistein + kreatin
Dakle, dva supstrata ovog enzima su S-adenozil metionin i guanidinoacetat, dok su njegova dva proizvoda S-adenozilhomocistein i kreatin. S-adenosyl-L-methionine + guanidinoacetate S-adenosyl-L-homocysteine + creatine
Ovaj enzim pripada porodici transferaza, posebno onima metiltransferaze koji prenose jedan ugljik. Sistematsko ime ove enzimske klase je S-adenozil-L-metionin: N-gvanidinoacetat metiltransferaze. Ostala uobičajena imena su GA metilferaza, guanidinoacetat metiltransferaza, guanidinoacetat-transmetilaza, metionin-guanidinocetna transmetilaza i guanidoacetat-metiltransferaza. Ovaj enzim učestvuje u metabolizmu glicina, serina i treonina, arginina i prolina.
Protein koji kodira ovaj gen je metiltransferaza, koja pretvara guanidoacetat u kreatin, koristeći S-adenozilmetionin kao donor metila. Defekti ovog gena upleteni su u neurološke sindrome i mišićnu hipotoniju, vjerovatno zbog nedostatka kreatina i akumulacije guanidinoacetata u mozgu pogođenih osoba. Za ovaj gen su opisane dvije varijante transkripta koje kodiraju različite izoforme.[5]
Strukturne studije
urediKrajem 2007. godine za ovu klasu enzima utvrđeno je 7 struktura, sa pristupnim kodovima u PDB 1KHH, 1P1B 1P1B , 1P1C 1P1C, 1XCJ 1XCJ, 1XCL 1XCL, 1ZX0 1ZX0 i 2BLN.
Također pogledajte
urediReference
uredi- ^ a b c GRCh38: Ensembl release 89: ENSG00000130005 - Ensembl, maj 2017
- ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000020150 - Ensembl, maj 2017
- ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ a b "Entrez Gene: GAMT guanidinoacetate N-methyltransferase".
Dopunska literatura
uredi- 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.
- 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. 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.
- Chae YJ; Chung CE; Kim BJ; et al. (1998). "The gene encoding guanidinoacetate methyltransferase (GAMT) maps to human chromosome 19 at band p13.3 and to mouse chromosome 10". Genomics. 49 (1): 162–4. doi:10.1006/geno.1998.5236. PMID 9570966.
- Jenne DE, Olsen AS, Zimmer M (1997). "The human guanidinoacetate methyltransferase (GAMT) gene maps to a syntenic region on 19p13.3, homologous to band C of mouse chromosome 10, but GAMT is not mutated in jittery mice". Biochem. Biophys. Res. Commun. 238 (3): 723–7. doi:10.1006/bbrc.1997.9992. PMID 9325156.
- 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.
- Stöckler S; Isbrandt D; Hanefeld F; et al. (1996). "Guanidinoacetate methyltransferase deficiency: the first inborn error of creatine metabolism in man". Am. J. Hum. Genet. 58 (5): 914–22. PMC 1914613. PMID 8651275.
- 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.
- Cantoni GL, Scarano E (1954). "The formation of S-adenosylhomocysteine in enzymatic transmethylation reactions". J. Am. Chem. Soc. 76 (18): 4744. doi:10.1021/ja01647a081.
- CANTONI GL, VIGNOS PJ (1954). "Enzymatic mechanism of creatine synthesis". J. Biol. Chem. 209 (2): 647–59. PMID 13192118.
Vanjski linkovi
uredi- PDBe-KB provides an overview of all the structure information available in the PDB for Human Guanidinoacetate N-methyltransferase
