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5'-Nucleotidase was purified greater than 1000-fold from human placenta by treatment of plasma membranes with S. aureus phosphatidylinositol-specific phospholipase C and affinity chromatography on Con A Sepharose and AMP-Sepharose. The resulting enzyme had a specific activity of greater than 5000 mumol/hr/mg protein and a subunit molecular weight of 73,000. Goat antibodies against 5'-nucleotidase inhibited enzyme activity and detected 5'-nucleotidase after Western blotting. These antibodies also recognized a soluble form of 5'-nucleotidase and residual membrane-bound 5'-nucleotidase which could not be released by phosphatidylinositol-specific phospholipase C treatment, suggesting that the three forms of the enzyme are structurally related. The soluble 5'-nucleotidase may be derived from the membrane-bound form by the action of an endogenous phospholipase C. The structural basis for the inability of some of the membrane-bound 5'-nucleotidase to be released by phosphatidylinositol-specific phospholipase C is unknown.
L F Thompson, and
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L F Thompson, and
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L F Thompson, and
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L F Thompson, and
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L F Thompson, and
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L F Thompson, and
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L F Thompson, and
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