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CHR, A Novel Family Of Prokaryotic Proton Motive Force-Driven Transporters Probably Containing Chromate/Sulfate Antiporters

Dietrich H. Nies, Sandra Koch, Shinichiro Wachi, Nicola Peitzsch, Milton H. Saier

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ABSTRACT We describe a small family of proteins, CHR, which contains members that function in chromate and/or sulfate transport. CHR proteins occur in bacteria and archaea. They consist of about 400 amino acyl residues, appear to have 10 transmembrane α-helical segments in an unusual 4+6 arrangement, and arose by an intragenic duplication event.