Inhibition of pigeon breast muscle α‐ketoglutarate dehydrogenase by phosphonate analogues of α‐ketoglutarate

Abstract

Succinylphosphonate (SP) is a powerful inhibitor of alpha-ketoglutarate dehydrogenase (KGD). Methylation of the phosphonate reduces its inhibitory effect. The complex of KGD with SP undergoes a kinetically slow transition similar to the process observed during catalysis. alpha-Ketoglutarate binds to the enzyme-inhibitor complex, preventing its isomerisation.