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Cysteine synthase from rape leaves.

M Masada, K Fukushima, G Tamura

    Journal of Biochemistry
    |May 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Researchers purified cysteine synthase from Brassica chinensis var. Komatsuna. This enzyme, crucial for amino acid synthesis, was found to be a dimer with bound pyridoxal phosphate.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Plant Science

    Background:

    • Cysteine synthase (O-Acetyl-L-serine acetate-lyase) catalyzes a key step in cysteine biosynthesis.
    • Understanding the properties of cysteine synthase is vital for comprehending sulfur metabolism in plants.

    Purpose of the Study:

    • To highly purify cysteine synthase from rape (Brassica chinensis var. Komatsuna).
    • To characterize the molecular properties of the purified enzyme.

    Main Methods:

    • Enzyme purification from Brassica chinensis var. Komatsuna extract.
    • Homogeneity assessment using Sephadex G-100 gel filtration.
    • Subunit analysis via dodecylsulfate-polyacrylamide gel electrophoresis (SDS-PAGE).

    Main Results:

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    • The purified cysteine synthase preparation was homogeneous.
    • The enzyme exhibited a molecular weight of approximately 62,000 Daltons.
    • SDS-PAGE indicated the enzyme consists of two identical subunits.
    • Two moles of pyridoxal phosphate were bound per mole of enzyme.

    Conclusions:

    • Cysteine synthase from Brassica chinensis var. Komatsuna has been successfully purified.
    • The enzyme is a homodimer with a molecular weight of 62 kDa.
    • The presence of pyridoxal phosphate suggests its role as a cofactor in the enzyme's catalytic activity.