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  • Title: Inactivation of human lactate dehydrogenase isozymes by sulfhydryl reagents.
    Author: Anderson BM, Anderson CD.
    Journal: Anal Biochem; 1987 Mar; 161(2):258-61. PubMed ID: 3578792.
    Abstract:
    Human lactate dehydrogenase isozymes, LDH-1 and LDH-5, were inactivated at 25 degrees C and pH 7.5 by N-alkylmaleimides of varying chain length, and by fluorescein mercuric acetate. Second-order rate constants for the inactivation of LDH-5 by N-alkylmaleimides increased with increasing chain length of the maleimide derivative while essentially no chain-length effect was observed in the inactivation of LDH-1. Both isozymes were effectively inactivated by low concentrations of fluorescein mercuric acetate, and in both cases saturation kinetics were observed. Dissociation constants obtained from double-reciprocal plotting methods indicated a twofold better binding of fluorescein mercuric acetate to LDH-1. Protection from fluorescein mercuric acetate by NAD was observed with both enzymes.
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