Ternary complex formation of pig heart lactate dehydrogenase with spin-labelled coenzymes and inhibitors as studied by electron spin resonance
1979; Elsevier BV; Volume: 568; Issue: 2 Linguagem: Inglês
10.1016/0005-2744(79)90296-1
ISSN1878-1454
AutoresH. Wenzel, Wolfgang E. Trommer,
Tópico(s)Electrochemical sensors and biosensors
ResumoThe formation of ternary inhibitor and 'dead end' complexes of pig heart lactate dehydrogenase (L-lactate:NAD+ oxidoreductase, EC 1.1.1.27) was studied by means of two NAD derivatives, spin-labelled at N6 and C-8 of the adenine ring. Dissociation constants calculated for the inhibitors oxamate and oxalate from their corresponding ternary complexes are in excellent agreement with data from literature derived from sedimentation experiments. However, the recently postulated enzyme-NADH-sulfite complex was not observed. The mobility of the spin-label, i.e. the protein conformation near the adenine binding pocket in various ternary complexes depends on the type of inhibition or substrate employed.
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