Biology:Theobromine synthase
| Theobromine synthase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC number | 2.1.1.159 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
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Theobromine synthase (EC 2.1.1.159) is an enzyme that catalyzes the chemical reaction
- REDIRECT Template:Chemical reaction
This is a methylation reaction in which the 7-methylxanthine is converted to theobromine. The methyl group comes from the cofactor, S-adenosyl methionine (SAM), which becomes S-adenosyl-L-homocysteine (SAH). The enzyme was characterised from coffee plants.[1][2]
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:7-methylxanthine N3-methyltransferase. Other names in common use include monomethylxanthine methyltransferase, MXMT, CTS1, CTS2, and S-adenosyl-L-methionine:7-methylxanthine 3-N-methyltransferase.[3] The reaction is part of the biosynthesis pathway to caffeine.[4]
References
- ↑ "7-Methylxanthine methyltransferase of coffee plants. Gene isolation and enzymatic properties". J. Biol. Chem. 276 (11): 8213–8. 2001. doi:10.1074/jbc.M009480200. PMID 11108716.
- ↑ "Molecular cloning and functional characterization of three distinct N-methyltransferases involved in the caffeine biosynthetic pathway in coffee plants". Plant Physiol. 132 (1): 372–80. 2003. doi:10.1104/pp.102.019679. PMID 12746542.
- ↑ Enzyme 2.1.1.159 at KEGG Pathway Database.
- ↑ "Substrate specificity of N-methyltransferase involved in purine alkaloids synthesis is dependent upon one amino acid residue of the enzyme". Mol. Genet. Genomics 275 (2): 125–35. 2006. doi:10.1007/s00438-005-0070-z. PMID 16333668.
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