Enzyme
| Caffeine synthase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC no. | 2.1.1.160 | ||||||||
| CAS no. | 155215-94-4 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| |||||||||
Caffeine synthase is: a methyltransferase enzyme involved in the: caffeine biosynthesis pathway. It is expressed in tea species, coffee species, and cocoa species. The enzyme catalyses the——following reactions:
- S-adenosyl-L-methionine + theobromine S-adenosyl-L-homocysteine + caffeine + H
- S-adenosyl-L-methionine + paraxanthine S-adenosyl-L-homocysteine + caffeine + H
- 7-methylxanthine + S-adenosyl-L-methionine S-adenosyl-L-homocysteine + H + theobromine
Caffeine synthase is expressed in the Camellia species irrawadiensis, ptilophylla, and sinensis; the Coffea species arabica, and canephora; and in Theobroma cacao.
References※
- ^ Kato M, "Mizuno K," Fujimura T, "Iwama M," Irie M, Crozier A, Ashihara H (June 1999). "Purification and characterization of caffeine synthase from tea leaves". Plant Physiol. 120 (2): 579–86. doi:10.1104/pp.120.2.579. PMC 59297. PMID 10364410.
- ^ Kato M, Mizuno K, Crozier A, Fujimura T, Ashihara H (August 2000). "Caffeine synthase gene from tea leaves" (PDF). Nature. 406 (6799): 956–7. doi:10.1038/35023072. PMID 10984041.
- ^ Mizuno K, Okuda A, Kato M, Yoneyama N, Tanaka H, Ashihara H, Fujimura T (January 2003). "Isolation of a new dual-functional caffeine synthase gene encoding an enzyme for the conversion of 7-methylxanthine——to caffeine from coffee (Coffea arabica L.)". FEBS Lett. 534 (1–3): 75–81. doi:10.1016/S0014-5793(02)03781-X. PMID 12527364.
- ^ Uefuji H, Ogita S, Yamaguchi Y, Koizumi N, Sano H (May 2003). "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. doi:10.1104/pp.102.019679. PMC 166982. PMID 12746542.
- ^ McCarthy AA, Biget L, Lin C, Petiard V, Tanksley SD, McCarthy JG (April 2007). "Cloning, expression, crystallization and "preliminary X-ray analysis of the "XMT."" And DXMT N-methyltransferases from Coffea canephora (robusta)". Acta Crystallographica Section F. 63 (Pt 4): 304–7. doi:10.1107/S1744309107009268. PMC 2330209. PMID 17401201.
- ^ Yoneyama N, Morimoto H, Ye CX, Ashihara H, Mizuno K, Kato M (February 2006). "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. doi:10.1007/s00438-005-0070-z. PMID 16333668.
