acetyl-CoA + H2O + oxaloacetate = citrate + CoA + H(+) Carbohydrate metabolism; tricarboxylic acid cycle; isocitrate from oxaloacetate: step 1/2. Expressed only in siliques. Not expressed in flower, stem, cauline leaf, young leaf, mature leaf and senescent leaf. Weakly or not expressed during seedling growth. Citrate synthase is found in nearly all cells capable of oxidative metabolism. Belongs to the citrate synthase family.