Required for the synthesis of OHHL (N-(3-oxohexanoyl)-L-homoserine lactone), an autoinducer molecule which binds to EsaR. OHHL is necessary for biosynthesis of EPS virulence factor (extracellular heteropolysaccharide) which plays a role in the development of Stewart's wilt on sweet corn. 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.