Abstract
PorB is one of the major porins found in the cell wall of C. glutamicum. Somewhat surprisingly, for an outer membrane protein, the recently determined X-ray structures of PorB monomers revealed a helical topology. A model for the pentameric protein was proposed base upon (1) the required polar interior and nonpolar exterior of the porin, (2) a recurring crystal packing contact around a 2-fold axis, (3) the assumption of a simple Cn symmetry, (4) the experimentally established electric conductivity and anion selectivity and (5) the generally observed shape of porin channels.
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