Referenced in: none

Automatically associated channels: Kv2.1

Title: The arachidonate-activatable, NADPH oxidase-associated H+ channel is contained within the multi-membrane-spanning N-terminal region of gp91-phox.

Authors: L M Henderson, S Thomas, G Banting, J B Chappell

Journal, date & volume: Biochem. J., 1997 Aug 1 , 325 ( Pt 3), 701-5

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/9271091

Abstract
The generation of superoxide by the NADPH oxidase of neutrophils is accompanied by the efflux of H+ ions through a H+ channel. gp91-phox, a protein component of the oxidase, has been shown previously to function as a H+ channel [Henderson, Banting and Chappell (1995) J. Biol. Chem. 270, 5909-5916]. We have constructed a CHO cell line (CHO-N) that expresses an N-terminal fragment of gp91-phox containing the predicted multiple transmembrane domains of the protein. These cells exhibit H+ fluxes in response to an imposed proton motive force and in the presence of arachidonate (to open the channel). The H+ fluxes were indistinguishable from those observed in cells expressing full-length gp91-phox. Therefore the N-terminal 230 amino acids of gp91-phox contain all that is required to function as the NADPH oxidase-associated H+ channel.