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    Biochemistry (Mosc). 2007 Jan;72(1):68-76.

    Binding of substrate at the effector site of pyrophosphatase increases the rate of its hydrolysis at the active site.

    Sitnik TS, Avaeva SM.

    Source

    Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119992, Russia.

    Abstract

    It is shown that in addition to the active site, each subunit of Escherichia coli inorganic pyrophosphatase (E-PPase) contains an extra binding site for the substrate magnesium pyrophosphate or its non-hydrolyzable analog magnesium methylenediphosphonate. The occupancy of the extra site stimulates the substrate conversion. Binding affinity of this site decreased or disappeared upon the conversion of E-PPase into a trimeric form or introduction of point mutations. However, when the slowly hydrolyzed substrate, lanthanum pyrophosphate (LaPP(i)), is used, the extra site was revealed in all enzyme forms of E-PPase and of Y-PPase (Saccharomyces cerevisiae PPase), resulting in about 100-fold activation of hydrolysis. A hypothesis on the localization of the extra site and the mechanism of its effect in E-PPase is presented.

    PMID:
    17309439
    [PubMed - indexed for MEDLINE]

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