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• W1569324951 abstract "The Mr approximately 540,000 dimeric actin gelation protein, actin-binding protein (ABP), has previously been shown in human platelets to link actin to membrane glycoprotein Ib (GPIb) (Fox, J. E. B. (1985) J. Biol. Chem. 260, 11970-11977; Okita, J. R., Pidard, D., Newman, P. J., Montgomery, R. R., and Kunicki, T. J. (1985) J. Cell Biol. 100, 317-321). We have examined further the interaction between ABP and GPIb. Platelet extracts were depleted of ABP by precipitation with anti-ABP monoclonal antibodies (mAbs); in resulting precipitates, ABP monomer is complexed with GPIb in a 5:1 molar ratio. The ABP.GPIb complex is resistant to chaotropic solvents but dissociated by the ionic detergent, sodium dodecyl sulfate. Treatment of intact platelets with the ionophore A23187 activates a Ca2+-dependent protease which cleaves the Mr approximately 270,000 ABP subunit into three fragments of Mr 190,000, 100,000, and 90,000; the latter fragment is derived from the Mr 100,000 fragment. Anti-ABP mAbs coprecipitated GPIb with the Mr 100,000 and 90,000 fragments, but not with the Mr 190,000 fragment which contains the ABP self-association site. In the reciprocal experiment, anti-GPIb antibodies co-precipitated only the Mr 100,000 and 90,000 ABP fragments. Actin also co-precipitated with the Mr 100,000 and 90,000, but not with the Mr 190,000 ABP fragment. The anti-ABP mAb that precipitated the Mr 100,000-90,000 GPIb-binding ABP fragment recognizes a trypsin cleavage fragment of ABP that binds actin filaments in vitro. These findings establish that both the GPIb-binding site and actin-binding sites are in the same region of the ABP monomer. Because of the extended bipolar conformation of the ABP molecule, the data suggest that the GPIb.actin-binding region is located remote from the self-association, or dimerization, site of the ABP subunit." @default.
• W1569324951 created "2016-06-24" @default.
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• W1569324951 date "1988-09-01" @default.
• W1569324951 modified "2023-10-10" @default.
• W1569324951 title "Localization of the domain of actin-binding protein that binds to membrane glycoprotein Ib and actin in human platelets." @default.
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• W1569324951 doi "https://doi.org/10.1016/s0021-9258(18)37705-6" @default.
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