Summary
After treatment of red cell ghosts with chymotrypsin, the predominant intrinsic peptides remaining in the membrane fraction are 15,000 and 9,000 daltons mol wt. After partial extraction with Triton X-100, the residual membrane vesicles have almost no other stained peptides and such vesicles are reported to carry out anion transport activities sensitive to specific inhibitors. In vesicles derived from cells treated with DIDS(4,4′-diisothiocyano-2,2′-stilbene disulfonic acid), an irreversible inhibitor of anion transport that is highly localized in an abundant intrinsic protein known as band 3, the probe is largely recovered in the 15,000 dalton peptide. The part of band 3 from which it is derived is a previously reported 17,000 transmembrane segment (Steck, T.L., Ramos, R., Strapazon, E., 1976,Biochemistry 15:1154). The 9,000-dalton peptide is present in the vesicles in a one-to-one mole ratio with the 15,000-dalton peptide, suggesting that both are derived from the same protein. This conclusion is supported by the finding that the 35,000-dalton C-terminal end of band 3, derived by chymotrypsin treatment of cells, is further proteolysed if the cells are converted to ghosts and its disappearance coincides with the appearance of the 9,000-dalton fragment. Evidence is presented that the 9,000-dalton fragment crosses the bilayer and that it is closely associated with the 15,000-dalton peptide.
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This paper is dedicated to the memory of Walther Wilbrandt.
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Ramjeesingh, M., Grinstein, S. & Rothstein, A. Intrinsic segments of band 3 that are associated with anion transport across red blood cell membranes. J. Membrain Biol. 57, 95–102 (1980). https://doi.org/10.1007/BF01868996
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DOI: https://doi.org/10.1007/BF01868996