Javier Farinas, Alfred N. van Hoek, Lan Bo Shi, Christopher Erickson, A. S. Verkman
Abstract:CHIP28 is an abundant water-transporting protein in erythrocytes, kidney proximal tubule, and other fluid-transporting tissues. To determine the environment of the four tryptophans in CHIP28, fluorescence spectra and quenching by polar and nonpolar compounds were measured in stripped human erythrocyte membranes containing CHIP28 and in proteoliposomes reconstituted with purified CHIP28; comparative studies were performed in membranes containing MIP26. Functional analysis showed that CHIP28 water permeability w…
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