1i78
From Proteopedia
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| , resolution 2.6Å | |||||||
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| Ligands: | and | ||||||
| Gene: | OMPT (Escherichia coli) | ||||||
| Activity: | Omptin, with EC number 3.4.23.49 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
CRYSTAL STRUCTURE OF OUTER MEMBRANE PROTEASE OMPT FROM ESCHERICHIA COLI
Overview
OmpT from Escherichia coli belongs to a family of highly homologous outer membrane proteases, known as omptins, which are implicated in the virulence of several pathogenic Gram-negative bacteria. Here we present the crystal structure of OmpT, which shows a 10-stranded antiparallel beta-barrel that protrudes far from the lipid bilayer into the extracellular space. We identified a putative binding site for lipopolysaccharide, a molecule that is essential for OmpT activity. The proteolytic site is located in a groove at the extracellular top of the vase-shaped beta-barrel. Based on the constellation of active site residues, we propose a novel proteolytic mechanism, involving a His-Asp dyad and an Asp-Asp couple that activate a putative nucleophilic water molecule. The active site is fully conserved within the omptin family. Therefore, the structure described here provides a sound basis for the design of drugs against omptin-mediated bacterial pathogenesis. Coordinates are in the Protein Data Bank (accession No. 1I78)
About this Structure
1I78 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Crystal structure of the outer membrane protease OmpT from Escherichia coli suggests a novel catalytic site., Vandeputte-Rutten L, Kramer RA, Kroon J, Dekker N, Egmond MR, Gros P, EMBO J. 2001 Sep 17;20(18):5033-9. PMID:11566868
Page seeded by OCA on Thu Mar 20 11:46:34 2008
