Abstract
Evidence for an enamine mechanism of inactivation of pig brain γ-aminobutyric acid (GABA) aminotransferase by (S,E)-4-amino-5-fluoropent-2-enoic acid is presented. apo-GABA aminotransferase reconstituted with [3H]pyridoxal 5′-phosphate is inactivated by (S,E)-4-amino-5-fluoropent-2-enoic acid and the pH is raised to 12. All of the radioactivity is released from the enzyme as an adduct of the cofactor; no [3H]pyridoxamine 5′-phosphate is generated.
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