Histidine is converted to histamine by:

Active form of Pyridoxine Pyridoxal Phosphate (PLP) Mainly used for Amino Acid metabolism. Coenzyme Role of Pyridoxal Phosphate (PLP) Transamination Alanine Amino Transferase (ALT) Aspartate Amino Transferase (AST) Alanine Glyoxalate Amino Transferase. Decarboxylation of amino acids This results in the formation of Biogenic Amines Glutamate: CABA 5-Hydroxy Tryptophan: Serotonin Histidine: Histamine Cysteine: Taurine Serine: Ethanolamine DOPA: Dopamine. Key Concept: Histidine is converted to Histamine by the process of decarboxylation.