Beta-ketoacyl-ACP synthase I

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3-oxoacyl-[acyl-carrier-protein] synthase I
EC no.
CAS no.9077-10-5
IntEnzIntEnz view
ExPASyNiceZyme view
MetaCycmetabolic pathway
PDB structuresRCSB PDB PDBe PDBsum
Gene OntologyAmiGO / QuickGO

In enzymology, a beta-ketoacyl-acyl-carrier-protein synthase I (EC is an enzyme that catalyzes the chemical reaction

an acyl-acyl-carrier-protein + malonyl-acyl-carrier-protein a 3-oxoacyl-acyl-carrier-protein + CO2 + acyl-carrier-protein

Thus, the two substrates of this enzyme are acyl-acyl-carrier-protein and malonyl-acyl-carrier-protein, whereas its 3 products are 3-oxoacyl-acyl-carrier-protein, CO2, and acyl carrier protein. This enzyme participates in fatty acid biosynthesis. This enzyme belongs to the family of transferases, specifically those acyltransferases transferring groups other than aminoacyl groups.


The systematic name of this enzyme class is acyl-[acyl-carrier-protein]:malonyl-[acyl-carrier-protein] C-acyltransferase (decarboxylating).

Other names in common use include:

  • beta-ketoacyl-ACP synthase I,
  • beta-ketoacyl synthetase,
  • beta-ketoacyl-ACP synthetase,
  • beta-ketoacyl-acyl carrier protein synthetase,
  • beta-ketoacyl-[acyl carrier protein] synthase,
  • beta-ketoacylsynthase,
  • condensing enzyme (CE),
  • 3-ketoacyl-acyl carrier protein synthase,
  • fatty acid condensing enzyme,
  • acyl-malonyl(acyl-carrier-protein)-condensing enzyme,
  • acyl-malonyl acyl carrier protein-condensing enzyme,
  • beta-ketoacyl acyl carrier protein synthase,
  • 3-oxoacyl-[acyl-carrier-protein] synthase,
  • 3-oxoacyl:ACP synthase I,
  • KASI,
  • KAS I,
  • FabF1, and
  • FabB.


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  • Toomey RE, Wakil SJ (Mar 1966). "Studies on the mechanism of fatty acid synthesis. XVI. Preparation and general properties of acyl-malonyl acyl carrier protein-condensing enzyme from Escherichia coli". The Journal of Biological Chemistry. 241 (5): 1159–65. PMID 5327099.
  • D'Agnolo G, Rosenfeld IS, Vagelos PR (Jul 1975). "Multiple forms of beta-ketoacyl-acyl carrier protein synthetase in Escherichia coli". The Journal of Biological Chemistry. 250 (14): 5289–94. PMID 237914.
  • Garwin JL, Klages AL, Cronan JE (Dec 1980). "Structural, enzymatic, and genetic studies of beta-ketoacyl-acyl carrier protein synthases I and II of Escherichia coli". The Journal of Biological Chemistry. 255 (24): 11949–56. PMID 7002930.
  • Wang H, Cronan JE (Aug 2004). "Functional replacement of the FabA and FabB proteins of Escherichia coli fatty acid synthesis by Enterococcus faecalis FabZ and FabF homologues". The Journal of Biological Chemistry. 279 (33): 34489–95. doi:10.1074/jbc.M403874200. PMID 15194690.
  • Neidhardt, F.C. (Ed.), Escherichia coli and Salmonella: Cellular and Molecular Biology, 2nd ed., vol. 1, ASM Press, Washington, DC, 1996, p. 612-636.