the c4-enzymes phosphoenolpyruvate carboxylase ( ec 4.1.1.31 ) and malate dehydrogenase ( decarboxylating ) ( ec 1.1.1.40 ) and the non-photosynthetic linked enzymes malate dehydrogenase ( nad ) ( ec 1.1.1.37 ) , aspartate-2-oxoglutarate aminotransferase ( ec 1.1.1.37 ) , aspartate-2-oxoglutarate aminotransferase ( ec 2.6.1.1 . )
C0024544
malate dehydrogenase
C0030016
ec