Oxaloacetate is formed from
Aminotransferase (transaminase) reactions form pyruvate from alanine, oxaloacetate from aspaate, and a-ketoglutarate from glutamate. Because these reactions are reversible, the cycle also serves as a source of carbon skeletons for the synthesis of these amino acids. Other amino acids contribute to gluconeogenesis because their carbon skeletons give rise to citric acid cycle intermediates. Alanine, cysteine, glycine, hydroxyproline, serine, threonine, and tryptophan yield pyruvate; arginine, histidine, glutamine, and proline yield a-ketoglutarate; isoleucine, methionine, and valine yield succinyl-CoA; tyrosine and phenylalanine yield fumarate. Reference: Harper; 30th edition; Page no: 165
Glutamate
Histidine
Aspaate
Alanine
Metabolism of carbohydrate