3EEB image
Deposition Date 2008-09-04
Release Date 2008-10-21
Last Version Date 2024-02-21
Entry Detail
PDB ID:
3EEB
Keywords:
TOXIN
Title:
Structure of the V. cholerae RTX cysteine protease domain
Biological Source:
Source Organism:
Vibrio cholerae (Taxon ID: 666)
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.10 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.20
Space Group:
P 21 21 21
3EEB validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:RTX toxin RtxA
Gene (Uniprot):rtxA
Chain IDs:A, B
Chain Length:209
Number of Molecules:2
Biological Source:Vibrio cholerae
UniProt ID:Q9KS12 Pfam ID:PF11713
Ligand Molecules
IHP
NA
Primary Citation
Small molecule-induced allosteric activation of the Vibrio cholerae RTX cysteine protease domain
Science 322 265 268 (2008)
PMID: 18845756 DOI: 10.1126/science.1162403

Abstact

Vibrio cholerae RTX (repeats in toxin) is an actin-disrupting toxin that is autoprocessed by an internal cysteine protease domain (CPD). The RTX CPD is efficiently activated by the eukaryote-specific small molecule inositol hexakisphosphate (InsP6), and we present the 2.1 angstrom structure of the RTX CPD in complex with InsP6. InsP6 binds to a conserved basic cleft that is distant from the protease active site. Biochemical and kinetic analyses of CPD mutants indicate that InsP6 binding induces an allosteric switch that leads to the autoprocessing and intracellular release of toxin-effector domains.

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Primary Citation of related structures
3EEB