Involved in the synthesis of the acyl-homoserine lactone (AHL) signal N-(3-hydroxydodecanoyl)-L-HSL (3-hydroxy-C(12)-HSL or OH-dDHL). Probably part of a quorum-sensing system with AnoR. a fatty acyl-[ACP] + S-adenosyl-L-methionine = an N-acyl-L-homoserine lactone + H(+) + holo-[ACP] + S-methyl-5'-thioadenosine Positively regulated by AnoR. Deletion mutant does not produce OH-dDHL. Belongs to the autoinducer synthase family.