Enzyme glutamate oxaloacetate transaminase catalyzes the reaction between glutamate and oxaloacetate with the formation of a-ketoglutarate and aspartate due to transfer of one amino group from glutamate to oxaloacetate. Pyridoxal phosphate acts as the carrier of the amino group. Whenever it accepts the amino group, it transforms to pyridoxamine phosphate, and after the release of the amino group, it again becomes pyridoxal phosphate. Aspartate is decarboxylated by aspartate decarboxylase taking the help of pyridoxal phosphate.