2ZIT image
Deposition Date 2008-02-24
Release Date 2008-06-24
Last Version Date 2024-04-03
Entry Detail
PDB ID:
2ZIT
Title:
Structure of the eEF2-ExoA-NAD+ complex
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.00 Å
R-Value Free:
0.26
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Elongation factor 2
Gene (Uniprot):EFT1, EFT2
Chain IDs:A, C, E
Chain Length:842
Number of Molecules:3
Biological Source:Saccharomyces cerevisiae
Polymer Type:polypeptide(L)
Molecule:Exotoxin A
Gene (Uniprot):eta
Chain IDs:B, D, F
Chain Length:207
Number of Molecules:3
Biological Source:Pseudomonas aeruginosa
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
DDE A HIS ?
Ligand Molecules
Primary Citation
The nature and character of the transition state for the ADP-ribosyltransferase reaction.
Embo Rep. 9 802 809 (2008)
PMID: 18583986 DOI: 10.1038/embor.2008.90

Abstact

Exotoxin A (ExoA) from Pseudomonas aeruginosa is an important virulence factor that belongs to a class of exotoxins that are secreted by pathogenic bacteria which cause human diseases such as cholera, diphtheria, pneumonia and whooping cough. We present the first crystal structures, to our knowledge, of ExoA in complex with elongation factor 2 (eEF2) and intact NAD(+), which indicate a direct role of two active-site loops in ExoA during the catalytic cycle. One loop moves to form a solvent cover for the active site of the enzyme and reaches towards the target residue (diphthamide) in eEF2 forming an important hydrogen bond. The NAD(+) substrate adopts a conformation remarkably different from that of the NAD(+) analogue, betaTAD, observed in previous structures, and fails to trigger any loop movements. Mutational studies of the two loops in the toxin identify several residues important for catalytic activity, in particular Glu 546 and Arg 551, clearly supporting the new complex structures. On the basis of these data, we propose a transition-state model for the toxin-catalysed reaction.

Legend

Protein

Chemical

Disease

Primary Citation of related structures