PMID:16949612
| Citation |
Baslé, A, Rummel, G, Storici, P, Rosenbusch, JP and Schirmer, T (2006) Crystal structure of osmoporin OmpC from E. coli at 2.0 A. J. Mol. Biol. 362:933-42 |
|---|---|
| Abstract |
Porins form transmembrane pores in the outer membrane of Gram-negative bacteria with matrix porin OmpF and osmoporin OmpC from Escherichia coli being differentially expressed depending on environmental conditions. The three-dimensional structure of OmpC has been determined to 2.0 A resolution by X-ray crystallography. As expected from the high sequence similarity, OmpC adopts the OmpF-like 16-stranded hollow beta-barrel fold with three beta-barrels associated to form a tight trimer. Unlike in OmpF, the extracellular loops form a continuous wall at the perimeter of the vestibule common to the three pores, due to a 14-residues insertion in loop L4. The pore constriction and the periplasmic outlet are very similar to OmpF with 74% of the pore lining residues being conserved. Overall, only few ionizable residues are exchanged at the pore lining. The OmpC structure suggests that not pore size, but electrostatic pore potential and particular atomic details of the pore linings are the critical parameters that physiologically distinguish OmpC from OmpF. |
| Links |
PubMed Online version:10.1016/j.jmb.2006.08.002 |
| Keywords |
Amino Acid Sequence; Bacterial Outer Membrane Proteins/chemistry; Bacterial Outer Membrane Proteins/isolation & purification; Binding Sites; Crystallography, X-Ray; Escherichia coli/chemistry; Escherichia coli/genetics; Escherichia coli Proteins/chemistry; Escherichia coli Proteins/isolation & purification; Hydrogen Bonding; Models, Chemical; Molecular Sequence Data; Porins/chemistry; Protein Binding; Protein Conformation; Protein Folding; Protein Structure, Secondary; Sequence Homology, Amino Acid; Water/chemistry |
| edit table |
Significance
You can help EcoliWiki by summarizing why this paper is useful
Useful Materials and Methods
You can help Ecoliwiki by describing the useful materials (strains, plasmids, antibodies, etc) described in this paper.
Annotations
<protect><annotationlinks/></protect>
EcoliWiki Links
Add links to pages that link here (e.g. gene, product, method pages)
See also
References
See Help:References for how to manage references in EcoliWiki.
