Catalyzes the reduction of a carbon-carbon double bond in an enoyl moiety that is covalently linked to an acyl carrier protein (ACP). It confers resistance to triclosan. a 2,3-saturated acyl-[ACP] + NADP(+) = a (2E)-enoyl-[ACP] + H(+) + NADPH (2E)-butenoyl-[ACP] + H(+) + NADPH = butanoyl-[ACP] + NADP(+) Inhibited by triclosan. Lipid metabolism; fatty acid biosynthesis. Homotetramer. Expressed during exponential growth. Cells lacking this gene exhibit a 250-fold decrease in the triclosan MIC. Belongs to the short-chain dehydrogenases/reductases (SDR) family.