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Abstract
The present work discloses a procedure for preparation of human liver plasma membranes containing catalytically competent insulin receptor kinase. In addition to insulin promoted phosphorylation of the β-subunit of insulin receptor kinase, insulin promoted phosphorylation of pp120 and two other new proteins was demonstrated. The new proteins with molecular weights of 50,000 and 120,000 do not bind to WGA, pp120 antibody or insulin receptor antibody, but bind to the antiphosphotyrosyl antibody. The identity and physiological significance of these putative substrates for insulin receptor kinase remains to be established.
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