6GAV image
Entry Detail
PDB ID:
6GAV
Title:
Extremely 'open' clamp structure of DNA gyrase: role of the Corynebacteriales GyrB specific insert
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2018-04-12
Release Date:
2019-02-20
Method Details:
Experimental Method:
Resolution:
2.60 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:DNA gyrase subunit B,DNA gyrase subunit A
Chain IDs:A, B
Chain Length:1179
Number of Molecules:2
Biological Source:Mycobacterium tuberculosis
Ligand Molecules
Primary Citation
Overall Structures of Mycobacterium tuberculosis DNA Gyrase Reveal the Role of a Corynebacteriales GyrB-Specific Insert in ATPase Activity.
Structure 27 579 589.e5 (2019)
PMID: 30744994 DOI: 10.1016/j.str.2019.01.004

Abstact

Despite sharing common features, previous studies have shown that gyrases from different species have been modified throughout evolution to modulate their properties. Here, we report two crystal structures of Mycobacterium tuberculosis DNA gyrase, an apo and AMPPNP-bound form at 2.6-Å and 3.3-Å resolution, respectively. These structures provide high-resolution structural data on the quaternary organization and interdomain connections of a gyrase (full-length GyrB-GyrA57)2 thus providing crucial inputs on this essential drug target. Together with small-angle X-ray scattering studies, they revealed an "extremely open" N-gate state, which persists even in the DNA-free gyrase-AMPPNP complex and an unexpected connection between the ATPase and cleavage core domains mediated by two Corynebacteriales-specific motifs, respectively the C-loop and DEEE-loop. We show that the C-loop participates in the stabilization of this open conformation, explaining why this gyrase has a lower ATPase activity. Our results image a conformational state which might be targeted for drug discovery.

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Primary Citation of related structures