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    Biochem J. 1999 Aug 1;341 ( Pt 3):537-43.

    Adenylosuccinate synthase from Saccharomyces cerevisiae: homologous overexpression, purification and characterization of the recombinant protein.

    Lipps G, Krauss G.

    Source

    University Bayreuth, Biochemistry II, Universitätsstrasse 30, D-95447 Bayreuth, Germany. georg.lipps@uni-bayreuth.de

    Abstract

    Adenylosuccinate synthase (EC 6.3.4.4) catalyses the first committed step in the synthesis of adenosine. We have overexpressed the cloned gene of Saccharomyces cerevisiae (ADE12) in S. cerevisiae. The recombinant enzyme exhibits similar kinetic behaviour to that of the native enzyme purified from S. cerevisiae. This ter-reactant dimeric enzyme shows Michaelis-Menten kinetics only with IMP. l-Aspartate and GTP display a weak negative co-operativity (Hill coefficient 0. 8-0.9). This negative co-operativity has not yet been reported for adenylosuccinate synthases from other organisms. Another unusual feature of the enzyme from S. cerevisiae is its negligible inhibition by adenine nucleotides and its pronounced inhibition by Cl(-) ions.

    PMID:
    10417315
    [PubMed - indexed for MEDLINE]
    PMCID:
    PMC1220389
    Free PMC Article

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