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  • Title: Chemical modification of histidine, tyrosine, tryptophan and cysteine residues in carp (Cyprinus carpio) muscle enolase.
    Author: Pietkiewicz J, Kustrzeba-Wójcicka I, Wolna E, Wolny M.
    Journal: Biochem Int; 1987 May; 14(5):805-14. PubMed ID: 3454643.
    Abstract:
    Enolase from carp (Cyprinus Carpio) muscle was modified by diethylpyrocarbonate, tetranitromethane, N-bromosuccinimide and 5,5'-dithiobis(2-nitrobenzoic acid). The extent and rate of modification and its effect on the enzyme activity were determined. Modification of histidine, tyrosine and tryptophan residues caused complete inactivation of the enzyme; Mg2+ as well as 2-phosphoglycerate markedly altered the rates of modification and inactivation. The above-mentioned amino acid residues seem to be essential for the functioning of muscle enolases. Modification of cysteine residues had no effect on the enolase activity.
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