Required for the synthesis of a yet unknown N-aceyl-homoserine lactone (N-aceyl-HSL), an autoinducer molecule which binds to PhzR and thus regulates phenazine production. 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.