4EG3 image
Entry Detail
PDB ID:
4EG3
Keywords:
Title:
Trypanosoma brucei methionyl-tRNA synthetase in complex with product methionyl-adenylate
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2012-03-30
Release Date:
2012-09-12
Method Details:
Experimental Method:
Resolution:
2.94 Å
R-Value Free:
0.26
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Methionyl-tRNA synthetase, putative
Mutations:K452A, K453R, E454A
Chain IDs:A, B
Chain Length:542
Number of Molecules:2
Biological Source:Trypanosoma brucei brucei
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
CAS A CYS S-(DIMETHYLARSENIC)CYSTEINE
Primary Citation
Distinct States of Methionyl-tRNA Synthetase Indicate Inhibitor Binding by Conformational Selection.
Structure 20 1681 1691 (2012)
PMID: 22902861 DOI: 10.1016/j.str.2012.07.011

Abstact

To guide development of new drugs targeting methionyl-tRNA synthetase (MetRS) for treatment of human African trypanosomiasis, crystal structure determinations of Trypanosoma brucei MetRS in complex with its substrate methionine and its intermediate product methionyl-adenylate were followed by those of the enzyme in complex with high-affinity aminoquinolone inhibitors via soaking experiments. Drastic changes in conformation of one of the two enzymes in the asymmetric unit allowed these inhibitors to occupy an enlarged methionine pocket and a new so-called auxiliary pocket. Interestingly, a small low-affinity compound caused the same conformational changes, removed the methionine without occupying the methionine pocket, and occupied the previously not existing auxiliary pocket. Analysis of these structures indicates that the binding of the inhibitors is the result of conformational selection, not induced fit.

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Primary Citation of related structures