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The Gram-negative porin 2 (GBP-2) Family [Function: Non-specific diffusion channels] Seed alignment | Full alignment | Pfam page | TC-DB page

The Porin subfamily (Porin_2) contains proteins that form large aqueous channels, facilitating the diffusion of small hydrophilic molecules through the outer membrane in a non-specific manner. Important aspects of the channel activity are the conductance, the voltage dependence and the pH sensitivity. This family consists of the general diffusion porins originating mainly from the Alpha subdivision of Proteobacteria. Although members of this family share common structural and functional properties with the porins of General Bacterial Porin Family 1 (GBP-1) and the Rhodobacter porin family, they show a low sequence similarity to them. Prediction methods and low resolution experiments suggest that proteins of this family form ß-barrels, which is a common structural feature of general diffusion porins. DcaP is a highly abundant outer membrane (OM) protein in a pathogenic A. baumannii strain during infection. The X-ray crystal structure shows that surprisingly, DcaP is a trimeric 16-Stranded ß Barrel, “porin-like” OM protein.

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Literature references

New putative vaccine candidates against Acinetobacter baumannii using the reverse vaccinology method
Microb Pathog. 2020 Jun;143:104114. doi: 10.1016/j.micpath.2020.104114. Epub 2020 Mar 4.
PMID: 32145321

A Multidisciplinary Approach toward Identification of Antibiotic Scaffolds for Acinetobacter baumannii
Structure. 2019 Feb 5;27(2):268-280.e6. doi: 10.1016/j.str.2018.10.021. Epub 2018 Dec 13.
PMID: 30554842

Solute uptake through general porins
Front Biosci. 2003 May 1;8:d1055-71. doi: 10.2741/1132.
PMID: 12700124

The bacterial porin superfamily: sequence alignment and structure prediction
Mol Microbiol. 1991 Sep;5(9):2153-64. doi: 10.1111/j.1365-2958.1991.tb02145.x.
PMID: 1662760

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