6AX8 image
Entry Detail
PDB ID:
6AX8
Keywords:
Title:
Mycobacterium tuberculosis methionyl-tRNA synthetase in complex with methionyl-adenylate
Biological Source:
PDB Version:
Deposition Date:
2017-09-06
Release Date:
2018-04-11
Method Details:
Experimental Method:
Resolution:
2.60 Å
R-Value Free:
0.24
R-Value Work:
0.23
R-Value Observed:
0.23
Space Group:
H 3
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Methionine-tRNA ligase
Chain IDs:A
Chain Length:519
Number of Molecules:1
Biological Source:Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)
Ligand Molecules
Primary Citation
The crystal structure of the drug target Mycobacterium tuberculosis methionyl-tRNA synthetase in complex with a catalytic intermediate.
Acta Crystallogr F Struct Biol Commun 74 245 254 (2018)
PMID: 29633973 DOI: 10.1107/S2053230X18003151

Abstact

Mycobacterium tuberculosis is a pathogenic bacterial infectious agent that is responsible for approximately 1.5 million human deaths annually. Current treatment requires the long-term administration of multiple medicines with substantial side effects. Lack of compliance, together with other factors, has resulted in a worrisome increase in resistance. New treatment options are therefore urgently needed. Here, the crystal structure of methionyl-tRNA synthetase (MetRS), an enzyme critical for protein biosynthesis and therefore a drug target, in complex with its catalytic intermediate methionyl adenylate is reported. Phenylalanine 292 of the M. tuberculosis enzyme is in an `out' conformation and barely contacts the adenine ring, in contrast to other MetRS structures where ring stacking occurs between the adenine and a protein side-chain ring in the `in' conformation. A comparison with human cytosolic MetRS reveals substantial differences in the active site as well as regarding the position of the connective peptide subdomain 1 (CP1) near the active site, which bodes well for arriving at selective inhibitors. Comparison with the human mitochondrial enzyme at the amino-acid sequence level suggests that arriving at inhibitors with higher affinity for the mycobacterial enzyme than for the mitochondrial enzyme might be achievable.

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Primary Citation of related structures