Reaction: malonamoyl-[OxyC acyl-carrier protein] + 8 malonyl-CoA = 18-carbamoyl-3,5,7,9,11,13,15,17-octaoxooctadecanoyl-[OxyC acyl-carrier protein] + 8 CO2 + 8 CoA
For diagram of reaction click here.
Systematic name: malonyl-CoA:malonamoyl-[OxyC acyl-carrier protein] malonyltransferase
Comments: The synthesis, in the bacterium Streptomyces rimosus, of the tetracycline antibiotics core skeleton requires a minimal polyketide synthase (PKS) consisting of a ketosynthase (KS), a chain length factor (CLF), and an acyl-carrier protein (ACP). Initiation involves an amide-containing starter unit that becomes the C-2 amide that is present in the tetracycline compounds. Following the initiation, the PKS catalyses the iterative condensation of 8 malonyl-CoA molecules to yield the polyketide backbone of tetracycline. Throughout the proccess, the nascent chain is attached to the OxyC acyl-carrier protein.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
1. Thomas, R. and Williams, D.J. Oxytetracycline biosynthesis: origin of the carboxamide substituent. J. Chem. Soc., Chem. Commun. (1983) 677-679.
2. Zhang, W., Ames, B.D., Tsai, S.C. and Tang, Y. Engineered biosynthesis of a novel amidated polyketide, using the malonamyl-specific initiation module from the oxytetracycline polyketide synthase. Appl. Environ. Microbiol. 72 (2006) 2573-2580. [PMID: 16597959]
3. Yu, L., Cao, N., Wang, L., Xiao, C., Guo, M., Chu, J., Zhuang, Y. and Zhang, S. Oxytetracycline biosynthesis improvement in Streptomyces rimosus following duplication of minimal PKS genes. Enzyme Microb. Technol. 50 (2012) 318-324. [PMID: 22500899]