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- W2019771198 abstract "The equilibrium binding of hemoglobin to isolated band 3 protein exhibited positive cooperativity [Hill coefficient = 1.65 +/- 0.1; total number of binding sites at pH 6.6 in 5 mM sodium phosphate buffer = 32 500 +/- 940 pmol/mg; Ka = (3.0 +/- 0.5) X 10(5) M-1]. The binding was reversible and ionic in nature as the bound hemoglobin was readily displaced by KCl, ATP, and 2,3-diphosphoglycerate, the latter two being more effective than KCl on a molar basis. The ratio of the interaction of hemoglobin to band 3 protein per se was 1:1, whereas the band 3 preparation as a whole (protein + lipids) was 3:1. Saturating levels of glyceraldehyde-3-phosphate dehydrogenase blocked only 33% of the total binding sites which were localized at the cytoplasmic segment; the remaining 67% was localized in lipids by their extraction with acetone. Reconstitution of acetone-extracted band 3 with phospholipid liposomes indicated phosphatidylserine as the binding site. The positive cooperativity in binding to acetone-extracted band 3 was increased (Hill constant = 2.1 +/- 0.1) compared to the band 3 preparation. After separation of the alpha and beta chains of hemoglobin, only the alpha chain binds to band 3 with positive cooperativity to an extent of 45-50% of native hemoglobin with similar affinity. The binding capacity of p-(hydroxymercuri)benzoate (HMB) derivatives of hemoglobin and its alpha chain was less than that of native hemoglobin, whereas HMB-beta chain or beta chain did not bind.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2019771198 date "1986-06-03" @default.
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- W2019771198 title "Interaction of hemoglobin and its component .alpha. and .beta. chains with band 3 protein" @default.
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- W2019771198 doi "https://doi.org/10.1021/bi00359a054" @default.
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