Comparing the temperature-dependent conductance of the two structurally similar E. coli porins OmpC and OmpF.

ABSTRACT: The temperature-dependent ion conductance of OmpC, a major outer membrane channel of Escherichia coli, is predicted using all-atom molecular dynamics simulations and experimentally verified. To generalize previous results, OmpC is compared to its structural homolog OmpF at different KCl concentrations, pH values, and a broad temperature range. At low salt concentrations and up to room temperature, the molecular modeling predicts the experimental conductance accurately. At high salt concentrations above 1 M KCl and above room temperature, the simulations underestimate the conductance. Moreover, the temperature dependence of the channel conductance is different from that of the bulk, both in experiment and simulation, indicating a strong contribution of surface effects to the ion conductance

SUBMITTER: Biro I 

PROVIDER: S-EPMC2862207 | biostudies-literature | 2010 May

REPOSITORIES: biostudies-literature