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Gastric (H+,K+)-ATPase.

A Soumarmon, M J Lewin

    Biochimie
    |December 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    The gastric acid secretion enzyme (H+,K+)-ATPase exchanges ions and utilizes ATP. Its structure and function are detailed, revealing its role in active and passive transport.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Physiology

    Background:

    • Gastric acid secretion is regulated by the proton pump, (H+,K+)-ATPase.
    • This enzyme facilitates the exchange of hydrogen (H+) and potassium (K+) ions.
    • Understanding its function is crucial for comprehending gastric physiology.

    Purpose of the Study:

    • To elucidate the functional mechanisms of the (H+,K+)-ATPase.
    • To characterize the enzyme's structure and ATP binding sites.
    • To investigate its role in active and passive ion transport.

    Main Methods:

    • Enzyme assays measuring ATPase and PNPPase activity.
    • Solubilization and partial depolymerization of the enzyme using detergents (n-octylglucoside, cholate).
    • Analysis of enzyme subunits using SDS-PAGE.

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    Main Results:

    • The (H+,K+)-ATPase has two ATP binding sites with varying affinities for H+ and K+.
    • ATP hydrolysis at the high-affinity site forms an aspartyl phosphate intermediate, accumulating without K+.
    • The enzyme exists as a large complex (390-420 kDa) in membranes, with an inactive 95 kDa monomer in SDS.

    Conclusions:

    • The (H+,K+)-ATPase is a key enzyme in gastric acid production, catalyzing H+/K+ exchange via ATP hydrolysis.
    • Its activity is modulated by ion concentrations and ATP binding.
    • The enzyme functions as both an active transporter (with ATP) and a passive transporter (without ATP).