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[Substrate specificity of cysteine lyase].

Z A Tolosa, P N Maslova, E V Goriachenkova

    Biokhimiia (Moscow, Russia)
    |March 1, 1975
    PubMed
    Summary

    Cysteine lyase, a phosphopyridoxal-dependent enzyme, primarily acts on L-cysteine. It exhibits broad cosubstrate specificity, synthesizing L-cysteic acid but not utilizing alpha-phenyl- or alpha-methylcysteine.

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    Area of Science:

    • Biochemistry
    • Enzymology

    Background:

    • Cysteine lyase is a phosphopyridoxal-dependent enzyme.
    • It belongs to the beta-replacing lyases subgroup.

    Purpose of the Study:

    • To investigate the substrate specificity of cysteine lyase.
    • To understand its catalytic mechanisms and substrate interactions.

    Main Methods:

    • Enzyme assays were performed to determine substrate and cosubstrate preferences.
    • Kinetic analysis was used to determine inhibition constants.
    • Isotope exchange reactions were employed to study reaction mechanisms.

    Main Results:

    • Cysteine lyase shows narrow specificity for L-cysteine as the amino substrate.
    • It demonstrates broad specificity for cosubstrates, synthesizing L-cysteic acid.
    • The enzyme catalyzes alpha-H exchange in cysteine but not in analogues like L-alanine or serine.
    • L-serine inhibits the reaction by interfering with pyridoxylidene derivative formation.

    Conclusions:

    • Cysteine lyase is highly specific for L-cysteine.
    • Its mechanism involves pyridoxylidene intermediate formation and alpha,beta-elimination.
    • The enzyme's specificity is crucial for its biological function.

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