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Submitted on January 23, 2003
Accepted on March 11, 2003
Gating the Selectivity Filter in ClC Chloride Channels
Raimund Dutzler 1,Ernest B. Campbell 1,Roderick MacKinnon 1*
1 Howard Hughes Medical Institute, Laboratory of Molecular Neurobiology and Biophysics, Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.
* To whom correspondence should be addressed. E-mail: mackinn{at}rockvax.rockefeller.edu.
ClC channels conduct Cl- ions across cell membranes and therebygovern the electrical activity of muscle cells and certain neurons,the transport of fluid and electrolytes across epithelia, andthe acidification of intracellular vesicles. The structuralbasis of ClC channel gating was studied. Crystal structuresof wild type and mutant E. coli ClC channels bound to a monoclonalFab reveal three Cl- binding sites within the 15 Å neckof an hourglass shaped pore. The Cl- binding site nearest theextracellular solution can be occupied either by a Cl- ion orby a glutamate carboxyl group. Mutations of this glutamate residuein Torpedo ray ClC channels alter gating in electrophysiologicalassays. These findings reveal a form of gating in which theglutamate carboxyl group closes the pore by mimicking a Cl-ion.
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