Browse Text search Protein search Domain search Download User manual Related links Citation & Contact

The Alginate Export Porin (algE) Family [Function: Biogenesis/Secretion] Seed alignment | Full alignment | Pfam page | TC-DB page

Proteins of the AEP family are believed to export alginate (an acidic polysaccharide), across the outer membrane of Gram-negative bacteria. These proteins span the outer membrane forming a large ß-barrel comprised of 18 ß sheets, as the 3D structure of one of the family's members suggests. AlgE is a monomeric 18-stranded ß-barrel protein required for secretion of the extracellular polysaccharide alginate in Pseudomonas aeruginosa.

Specify pHMMs' % coverageUnspecified More than   
Representative image:  fam_img

Literature references

Alginate Biosynthesis Factories in Pseudomonas fluorescens: Localization and Correlation with Alginate Production Level
Appl Environ Microbiol. 2015 Dec 11;82(4):1227-1236. doi: 10.1128/AEM.03114-15. Print 2016 Feb 15.
PMID: 26655760

A conformational landscape for alginate secretion across the outer membrane of Pseudomonas aeruginosa
Acta Crystallogr D Biol Crystallogr. 2014 Aug;70(Pt 8):2054-68. doi: 10.1107/S1399004714001850. Epub 2014 Jul 25.
PMID: 25084326

Insights into the assembly of the alginate biosynthesis machinery in Pseudomonas aeruginosa
Appl Environ Microbiol. 2013 May;79(10):3264-72. doi: 10.1128/AEM.00460-13. Epub 2013 Mar 15.
PMID: 23503314

Dual roles of Pseudomonas aeruginosa AlgE in secretion of the virulence factor alginate and formation of the secretion complex
Appl Environ Microbiol. 2013 Mar;79(6):2002-11. doi: 10.1128/AEM.03960-12. Epub 2013 Jan 18.
PMID: 23335756

Structural basis for alginate secretion across the bacterial outer membrane
Proc Natl Acad Sci U S A. 2011 Aug 9;108(32):13083-8. doi: 10.1073/pnas.1104984108. Epub 2011 Jul 21.
PMID: 21778407

The Azotobacter vinelandii gene algJ encodes an outer-membrane protein presumably involved in export of alginate
Microbiology (Reading). 1996 Apr;142 ( Pt 4):873-80. doi: 10.1099/00221287-142-4-873.
PMID: 8936313

Overexpression of algE in Escherichia coli: subcellular localization, purification, and ion channel properties
J Bacteriol. 1994 Sep;176(18):5639-47. doi: 10.1128/jb.176.18.5639-5647.1994.
PMID: 7521870

Proteins in this family with 3D-structure
View Entry
# strands