Required for the synthesis of OHHL (N-(3-oxohexanoyl)-L-homoserine lactone) also known as VAI or N-(beta-ketocaproyl)homoserine lactone or 3-oxo-N-(tetrahydro-2-oxo-3-furanyl)-hexanamide, an autoinducer molecule which binds to LuxR and thus acts in bioluminescence regulation. a fatty acyl-[ACP] + S-adenosyl-L-methionine = an N-acyl-L-homoserine lactone + H(+) + holo-[ACP] + S-methyl-5'-thioadenosine Belongs to the autoinducer synthase family.