Porins B and C are cell wallchannel-forming proteins from Corynebacterium. Porin B from Corynebacterium glutamicum (Brevibacterium flavum) allows the exchange of material across the mycolic acid layer, which is the protective nonpolar barrier. Porin B has an alpha helical core structure consisting of four alpha-helices surrounding a nonpolar interior. There is a disulfide bridge between helices 1 and 4 to form a stable covalently bound ring.[1] The channel of PorB is oligomeric.[1]
^ abZiegler K, Benz R, Schulz GE (June 2008). "A putative alpha-helical porin from Corynebacterium glutamicum". J. Mol. Biol. 379 (3): 482–91. doi:10.1016/j.jmb.2008.04.017. PMID18462756.
