Inhibitory effect of acidic pH on OmpC porin: wild-type and mutant studies.

Abstract:

:By use of the patch clamp technique, we have compared the electrophysiological signature of OmpC porin channels at neutral and acidic pH. The perfusion of pH 5.4 buffer to the periplasmic side of excised patches promoted the closure or block of approximately 20% of the open porins present in the patch without changes in their single channel conductance. Besides this effect on the main, long-lived open state, lowering the pH also suppressed the spontaneous transitions of channels to another distinct short-lived open state. The inhibitory effect on the opening kinetics was particularly visible in two mutants (K16Q and E109Q) in which transitions to the short-lived open state are enhanced by the mutations themselves at pH 7.2. On the other hand, the R124Q mutant responded to acidic pH by an increased gating to the short-lived open state. The results suggest that acidic pH stabilizes a closed state of OmpC porin, and that the pH sensitivity might be conferred in part by R124, but not by K16 or E109.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Liu N,Delcour AH

doi

10.1016/s0014-5793(98)00975-2

subject

Has Abstract

pub_date

1998-08-28 00:00:00

pages

160-4

issue

1-2

eissn

0014-5793

issn

1873-3468

pii

S0014-5793(98)00975-2

journal_volume

434

pub_type

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