medium-chain s-acyl fatty acid synthase thioester hydrolase ( thioesterase ii ) , a discrete 263-residue serine active-site enzyme , modifies the product specificity of the de novo lipogenic pathway in certain specialized tissues by hydrolyzing the thioester bond linking the growing acyl chain to the 4'-phosphopantetheine of the fatty acid synthase .
C0020289
hydrolase
C0015683
fatty acid synthase