| Symbol: | PorB |
| PorB | |
| Pfam: | PF11565 |
| Interpro: | IPR021114 |
| Tcdb: | 1.B.34 |
| Opm Family: | 190 |
| Opm Protein: | 2vql |
Porins B and C are cell wall channel-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]