1.B.86.  The OmpO Outer Membrane Porin (OmpO) Family 

Some members of the OmpO family of bacteria play roles in oxidative stress tolerance (Ku et al. 2023; Yang et al. 2025). This has been documented with  Stenotrophomonas maltophilia KJ and Xanthomonas fragariae (see references cited above).


This family belongs to the Outer Membrane Pore-forming Protein I (OMPP-I) Superfamily .
 

References:

Ku, R.H., L.H. Li, Y.F. Liu, E.W. Hu, Y.T. Lin, H.F. Lu, and T.C. Yang. (2023). Implication of the σ Regulon Members OmpO and σ in the Δ-Mediated Decrease of Oxidative Stress Tolerance in Stenotrophomonas maltophilia. Microbiol Spectr 11: e0108023.
Yang, T.C., S.C. Wu, T.Y. Yeh, H.F. Lu, Y.T. Lin, and L.H. Li. (2025). NagPIBAF upregulation and ompO downregulation compromise oxidative stress tolerance of Stenotrophomonas maltophilia. BMC Microbiol 25: 122.
Examples:

TC#NameOrganismal TypeExample
1.B.86.1.1

OmpO family porin of an unclassified Stenotrophomonas species of 190 aas with 1 N-terminal TMS.


OmpO porin of an unclassified Stenotrophomonas

 
1.B.86.1.2

OmpO family porin of 198 aas and 1 N-terminal TMS.

OmpO of Xanthomonas fragariae

 
1.B.86.1.3

Outer membrane beta-barrel protein of 218 aas and 1 N-terminal TMS.

OmpO of Lysobacter auxotrophicus

 
1.B.86.1.4

Outer membrane beta-barrel protein, OmpO, of 213 aas and 1 N-terminal TMS.

OmpO of Vulcaniibacterium thermophilum

 
1.B.86.1.5

OmpO Porin family outer membrane protein of 198 aas and 1 N-terminal TMS as well as 1 C-terminal TMS.

OmpO of Idiomarina xiamenensis

 
1.B.86.1.6

Porin of 194 aas and 10 transmembrane β-strands, Omp1X (Park et al. 2014).

Proteobacteria

Porin of Xanthomonas oryzae