Outer‐membrane protein PhoE from Escherichia coli forms anion‐selective pores in lipid‐bilayer membranes

Roland BENZ, Richard P. DARVEAU, Robert Hancock

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Abstract

Porin PhoE of the outer membrane of Escherichia coli was isolated and purified. Reconstitution experiments with lipid bilayer membranes showed that this protein formed pores which had a single channel conductance of 210 pS at 0.1 M KCl. The PhoE pores were obviously not voltage‐controlled or regulated. In contrast to pores formed by the OmpF porin from E. coli the PhoE channel was found to be anion‐selective at neutral pH. Chloride is about three to ten times more permeable through the pore than alkali ions. On the basis of the observed pH dependence of the permeability ratio of anions and cations, this anionic selectivity is explained by the assumption that the PhoE pore contains an excess of fixed positive charges.

Original languageEnglish
Pages (from-to)319-324
Number of pages6
JournalEuropean Journal of Biochemistry
Volume140
Issue number2
DOIs
Publication statusPublished or Issued - 1 Jan 1984
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry

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