Acyl carrier protein–β-ketoacyl-ACP synthase complex (ACP-KAS complex)

The Acyl carrier protein–β-ketoacyl-ACP synthase (ACP-KAS) complex is a fundamental component of the Type II fatty acid synthesis (FAS II) pathway in bacteria (White et al., 2005, Annu Rev Biochem). This complex involves the interaction between the acyl carrier protein (ACP), which carries the growing acyl chain, and various β-ketoacyl-ACP synthases (FabH, FabB, and FabF) that catalyze the condensation of malonyl-ACP with an acyl group (Zhang et al., 2001, J Biol Chem). This step is the primary driver of fatty acid chain elongation, which is essential for the formation of the bacterial cell membrane and other lipid-derived structures. Because the bacterial FAS II system is structurally distinct from the human Type I fatty acid synthase (FAS I), it is a highly selective target for antibiotic development (Wright & Reynolds, 2007, Curr Opin Microbiol). Natural products such as platensimycin and platencin have been identified as potent inhibitors of the KAS enzymes within this complex, showing significant efficacy against multi-drug resistant pathogens like MRSA (Wang et al., 2006, Nature). Despite their potency, challenges remain in optimizing these inhibitors for clinical use due to poor pharmacokinetic properties and the potential for rapid resistance development (Parsons & Rock, 2011, Prog Lipid Res).

Other names

ACP-FabH complexACP-FabB complexACP-FabF complex3-oxoacyl-[acyl-carrier-protein] synthase complexBacterial fatty acid synthase II condensing complex

Inhibition of the condensation reaction between malonyl-ACP and an acyl group, preventing fatty acid chain elongation.