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J. Biol. Chem., Vol. 265, Issue 27, 16166-16172, 09, 1990

Kinetics and regulation of the ankyrin-band 3 interaction of the human red blood cell membrane

BJ Thevenin and PS Low
Department of Chemistry, Purdue University, West Lafayette, Indiana 47907.

In an attempt to identify potential regulatory mechanisms for erythrocyte membrane-cytoskeletal interactions, the kinetics and pH dependence of the band 3-ankyrin interaction were investigated. Association of 125I-ankyrin with KI-stripped inside-out erythrocyte membrane vesicles was found to proceed in two kinetic phases. The initial, fast phase (t1/2 approximately 15-30 min) involved predominantly the binding of ankyrin to low affinity sites (KD approximately 130 nM) in a pH-dependent manner. The apparent pKa values describing this reversible pH dependence (7.2 +/- 0.1 and 9.2 +/- 0.1) defined states of band 3 with high, moderate, and no capacity to bind ankyrin (in order of increasing pH). Since the cytoplasmic domain of band 3 also exists in 3 distinct conformational states characterized by apparent pKa values of 7.2 and 9.2, it was hypothesized that the reversible structural equilibrium in band 3 could influence ankyrin binding. The second or slow phase of ankyrin binding to band 3 involved the conversion of low to high affinity sites (KD approximately 13 nM). This phase, which was largely temperature and pH independent, required roughly an order of magnitude longer to reach completion than the fast phase. Unfortunately, even though the slow phase could be cleanly separated from the fast phase at low pH, insufficient data were available to formulate a physical interpretation of its origin. Significantly, however, even after completion of the slow phase under the most quantitative binding conditions identified, a maximum of only 26% of the band 3 was found to bind ankyrin in situ. Although higher ankyrin-band 3 stoichiometries may be achievable with the isolated cytoplasmic fragment of band 3, we interpret the above 1:4 stoichiometry to suggest that the tetramer of band 3 constitutes the predominant ankyrin binding oligomer of band 3 on the membrane.
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