21. The biosynthesis of histamine from histidine is catalyzed by the enzyme L-histidine decarboxylase . 22. GABA is synthesized in a single step from its precursor glutamate by glutamic acid decarboxylase . 23. Ornithine decarboxylase can catalyse the decarboxylation of DFMO instead of ornithine, as shown above. 24. L-DOPA is transformed into dopamine in the dopaminergic neurons by dopa-decarboxylase . 25. It, alongside inhibitors of peripheral dopa decarboxylase , have been used to complement levodopa. 26. Mevalonate diphosphate decarboxylase recognizes and binds two substrates : ATP and mevalonate 5-diphosphate. 27. Proposed mechanism for human mevalonate diphosphate decarboxylase . 28. Mevalonate diphosphate decarboxylase is a potential enzyme to be targeted in the cholesterol synthesis pathway. 29. Aromatic L-amino acid decarboxylase ( AADC ) levels were at no time affected. 30. It is an inhibitor of glutamate decarboxylase .
