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.