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  • Title: Purification and characterization of an (Na+ + K+)-ATPase proteolipid labeled with a photoaffinity derivative of ouabain.
    Author: Collins JH, Forbush B, Lane LK, Ling E, Schwartz A, Zot A.
    Journal: Biochim Biophys Acta; 1982 Mar 23; 686(1):7-12. PubMed ID: 6279154.
    Abstract:
    Highly purified lamb kidney (Na+ + K+)-ATPase was photoaffinity labeled with the tritiated 2-nitro-5-azidobenzoyl derivative of ouabain (NAB-ouabain). The labeled (Na+ + K+)-ATPase was mixed with unlabeled carrier enzyme. Two proteolipid (gamma 1 and gamma 2) fractions were then isolated by chromatography on columns of Sepharose CL-6B and Sephadex LH-60. The two fractions were interchangeable when rechromatographed on the LH-60 column, suggesting that gamma 1 is an aggregated form of gamma 2. The total yield was 0.8-1.5 mol of gamma component per mol of catalytic subunit recovered. This indicates that the gamma component is present in stoichiometric amounts in the Na+ + K+)-ATPase. The proteolipids that were labeled with NAB-ouabain copurified with the unlabeled proteolipids.
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