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Gating the Selectivity Filter in ClC Chloride Channels
Raimund Dutzler,Ernest B. Campbell,Roderick MacKinnon*
ClC channels conduct chloride (Cl-) ions
across cell membranes and thereby govern the electrical activity of
muscle cells andcertain neurons, the transport of fluid and
electrolytes acrossepithelia, and the acidification of intracellular
vesicles. Thestructural basis of ClC channel gating was studied.
Crystal structuresof wild-type and mutant Escherichia coli
ClC channels bound toa monoclonal Fab fragment reveal three
Cl- binding sites within the 15-angstrom neck of an
hourglass-shapedpore. The Cl- binding site nearest the
extracellular solution can be occupiedeither by a Cl- ion
or by a glutamate carboxyl group. Mutations of this glutamateresidue
in Torpedo ray ClC channels alter gating in
electrophysiologicalassays. These findings reveal a form of gating in
which the glutamatecarboxyl group closes the pore by mimicking a
Cl- ion.
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
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