S-Adenosylmethionine synthetase
| Methionine adenosyltransferase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
S-adenosylmethionine synthase 2, tetramer, Human | |||||||||
| Identifiers | |||||||||
| EC no. | 2.5.1.6 | ||||||||
| CAS no. | 9012-52-6 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| |||||||||
S-Adenosylmethionine synthetase (EC 2.5.1.6), also known as methionine adenosyltransferase (MAT), is an enzyme that creates S-adenosylmethionine (also known as AdoMet, SAM or SAMe) by reacting methionine (a non-polar amino acid) and ATP (the basic currency of energy).
Three types of MAT have been identified in mammals, and are denoted MAT I, II, and III. MAT I (resp. III) is composed of 4 (resp. 2) copies of the protein subunit coded by the gene MAT1A, while MAT II is a more complicated complex of the subunits coded by MAT2A and MAT2B.