| TCID | Name | Organismal Type | Example |
|---|---|---|---|
| 1.B.6.1.1 | OmpA porin | Bacteria | OmpA of E. coli (P0A910) |
| 1.B.6.1.2 | OmpF porin | Bacteria | OmpF (OprF) of Pseudomonas aeruginosa (P13794) |
| 1.B.6.1.3 | OmpATb porin (cation selective; pH dependent). The central domain (residues 73-220) has been reported to exhibit channel activity (Molle et al., 2006). However through structural analyses, Teriete et al. (2010) have provided evidence that it does not form a β-barrel, causing them to propose that it does not have porin activity. | Bacteria | OmpATb of Mycobacterium tuberculosis (P65593) |
| 1.B.6.1.4 | HMP-AB outer membrane porin (Gribun et al., 2004) | Bacteria | HMP-AB of Acinetobacter baumannii (Q8KWW6) |
| 1.B.6.1.5 | The OmpA-OmpF porin (OOP) family member, GmpA (involved in acetic acid fermentation; under quorum sensing control) (Iida et al., 2008). (most similar to 1.B.6.1.4) | Bacteria | GmpA of Gluconacetobacter intermedius (B3A000) |
| 1.B.6.2.1 | Outer membrane porin precursor, OmpX (8 TM β-strands) (NMR structures in lipid bilayers solved (Mahalakshmi et al., 2007; Mahalakshmi and Marassi, 2008) | Bacteria | OmpX of E. coli (P0A917) |
| 1.B.6.2.2 | The attachment inversion locus (Ail) (Bartra et al., 2007) | Proteobacteria | Ail of Yersinia pestis (Q0WCZ9) |
