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Beta-cyanoalanine synthase: purification and characterization.

T N Akopyan, A E Braunstein, E V Goryachenkova

    Proceedings of the National Academy of Sciences of the United States of America
    |April 1, 1975
    PubMed
    Summary
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    Researchers purified beta-cyano-L-alanine synthase from blue lupine seedlings. This enzyme, crucial for amino acid synthesis, shows unique substrate specificity and resistance to common inhibitors.

    Area of Science:

    • Biochemistry
    • Enzymology

    Background:

    • Beta-cyano-L-alanine synthase (EC 4.4.1.9) is a pyridoxal-5'-phosphate (PLP)-dependent enzyme.
    • Understanding its properties is key to elucidating amino acid metabolism pathways.

    Purpose of the Study:

    • To purify and characterize beta-cyano-L-alanine synthase from blue lupine seedlings.
    • To investigate its substrate specificity and catalytic properties.

    Main Methods:

    • Purification of the enzyme from blue lupine seedlings.
    • Gel electrophoresis for homogeneity assessment.
    • Spectroscopic analysis (UV-Vis) and determination of molecular weight and isoelectric point.
    • Enzyme kinetics and isotopic exchange assays.

    Main Results:

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    • The enzyme was purified approximately 4000-fold and found to be homogeneous.
    • Molecular weight was determined to be 52,000 Da, with one mole of PLP per mole of protein.
    • L-cysteine was identified as the primary substrate, with beta-chloro- and beta-thiocyano acting as alternative cosubstrates.
    • The enzyme demonstrated resistance to DL-cycloserine and D-penicillamine.
    • Catalysis of slow isotopic alpha-H exchange in cysteine was observed, enhanced by cosubstrates.

    Conclusions:

    • Beta-cyano-L-alanine synthase from blue lupine is a well-characterized PLP-dependent enzyme.
    • Its substrate and cosubstrate specificities provide insights into its biological role.
    • The enzyme's resistance to certain inhibitors suggests unique catalytic mechanisms.