<prompt> Histidine is converted to histamine by:TransaminationHydroxylationDecarboxylationReduction  <response>: Active form of PyridoxinePyridoxal Phosphate PLPMainly used for Amino Acid metabolism.Coenzyme Role of Pyridoxal Phosphate PLPTransaminationAlanine Amino Transferase ALTAspartate Amino Transferase ASTAlanine Glyoxalate Amino Transferase.Decarboxylation of amino acidsThis results in the formation of Biogenic AminesGlutamate: CABA5-Hydroxy Tryptophan: SerotoninHistidine: HistamineCysteine: TaurineSerine: EthanolamineDOPA: Dopamine.Key Concept:Histidine is converted to Histamine by the process of decarboxylation. 