IUBMB Enzyme Nomenclature


Accepted name: 2-oxo-3-(phosphooxy)propyl 3-oxoalkanoate synthase

Reaction: a medium-chain 3-oxoacyl-[acyl-carrier protein] + glycerone phosphate = 2-oxo-3-(phosphooxy)propyl 3-oxoalkanoate + a holo-[acyl-carrier protein]

Glossary: glycerone phosphate = dihydroxyacetone phosphate = 3-hydroxy-2-oxopropyl phosphate

Other name(s): afsA (gene name); scbA (gene name); barX (gene name)

Systematic name: 3-oxoacyl-[acyl-carrier protein]:glycerone phosphate 3-oxonacylltransferase

Comments: The enzyme catalyses the first committed step in the biosynthesis of γ-butyrolactone autoregulators that control secondary metabolism and morphological development in Streptomyces bacteria.

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:


1. Horinouchi, S., Suzuki, H., Nishiyama, M. and Beppu, T. Nucleotide sequence and transcriptional analysis of the Streptomyces griseus gene (afsA) responsible for A-factor biosynthesis. J. Bacteriol. 171 (1989) 1206-1210. [PMID: 2492509]

2. Kato, J.Y., Funa, N., Watanabe, H., Ohnishi, Y. and Horinouchi, S. Biosynthesis of γ-butyrolactone autoregulators that switch on secondary metabolism and morphological development in Streptomyces. Proc. Natl Acad. Sci. USA 104 (2007) 2378-2383. [PMID: 17277085]

3. Hsiao, N.H., Soding, J., Linke, D., Lange, C., Hertweck, C., Wohlleben, W. and Takano, E. ScbA from Streptomyces coelicolor A3(2) has homology to fatty acid synthases and is able to synthesize γ-butyrolactones. Microbiology 153 (2007) 1394-1404. [PMID: 17464053]

4. Lee, Y.J., Kitani, S. and Nihira, T. Null mutation analysis of an afsA-family gene, barX, that is involved in biosynthesis of the γ-butyrolactone autoregulator in Streptomyces virginiae. Microbiology 156 (2010) 206-210. [PMID: 19778967]

[EC created 2018]

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