Corynebacterial porin B

{{Short description|Bacterial proteins}}

{{Infobox protein family

| Symbol = PorB

| Name = PorB

| image =

| width =

| caption = crystal structure of porb from corynebacterium glutamicum (crystal form ii)

| Pfam = PF11565

| Pfam_clan =

| InterPro = IPR021114

| SMART =

| PROSITE =

| MEROPS =

| SCOP =

| TCDB = 1.B.34

| OPM family = 190

| OPM protein = 2vql

| CAZy =

| CDD =

}}

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.{{cite journal |vauthors=Ziegler K, Benz R, Schulz GE | title = A putative alpha-helical porin from Corynebacterium glutamicum | journal = J. Mol. Biol. | volume = 379 | issue = 3 | pages = 482–91 |date=June 2008 | pmid = 18462756 | doi = 10.1016/j.jmb.2008.04.017 }} The channel of PorB is oligomeric.