Molecular function

Catalysis of the reaction: a 2,3-saturated acyl-[ACP] + NADP+ = a (2E)-enoyl-[ACP] + H+ + NADPH.

This reaction completes each cycle of fatty acid elongation by catalyzing the stereospecific reduction of the double bond at position 2 of a growing fatty acid chain, while linked to the acyl- carrier protein, in an NADPH-dependent manner. Note that EC has reaction describing the stereo-specificity of the reaction with respect to NADP+ (cf. EC 1.3.1.39, EC 1.3.1.10 and EC 1.3.1.9).