Independently gated multiple substates of an epithelial chloride-channel protein.
We have purified a protein from Necturus maculosus gallbladder cells that forms chloride channels in an artificial membrane. The same protein apparently can form channels that are highly selective for chloride but can have conductances varying from 9 to about 150 pS. The high-conductance channels are blocked by the monoclonal antibody used to purify the protein, but this antibody has no effect on the 9-pS channels. The observation that gating of the low- and high-conductance states is independent and that the antibody affects only the latter has implications regarding the control of chloride conductance in cell membranes and the different types of channels described in those cells.
Finn
A L
AL
Department of Medicine, University of North Carolina, Chapel Hill 27599-7155.
Dillard
M
M
Gaido
M
M
D000818:Animals; D000906:Antibodies / Q000494:pharmacology; D002462:Cell Membrane / Q000502:physiology; D018118:Chloride Channels; D004848:Epithelium / Q000502:physiology; D005704:Gallbladder / Q000502:physiology*; D015640:Ion Channel Gating; D007473:Ion Channels / Q000502:physiology*; D008051:Lipid Bilayers; D008564:Membrane Potentials; D008565:Membrane Proteins / Q000302:isolation & purification / Q000502:physiology*; D009338:Necturus maculosus
D000906:Antibodies; D018118:Chloride Channels; D007473:Ion Channels; D008051:Lipid Bilayers; D008565:Membrane Proteins