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Protein e, a 43-kDa protein from the outer membrane of Campylobacter jejuni UA580, was purified and reconstituted into lipid bilayer membranes. It was shown to form small channels with a single channel conductance of 8.82 nS in 1M KCl. Zero current potential measurements demonstrated that the channel was approx. 10-fold selective for K+ over Cl− ions. A porin with a similar single channel conductance was observed in fractions from the outer membrane of Campylobacter fetus UA60.
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Huyer et al. (1986) studied this question.
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