Intracellular proton access in a Cl(-)/H(+) antiporter.

Abstract excerpt

Chloride-transporting membrane proteins of the CLC family appear in two distinct mechanistic flavors: H(+)-gated Cl(-) channels and Cl(-)/H(+) antiporters. Transmembrane H(+) movement is an essential feature of both types of CLC. X-ray crystal structures of CLC antiporters show the Cl(-) ion pathway through these proteins, but the H(+) pathway is known only inferentially by two conserved glutamate residues that...

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