4G3N

Mycobacterium tuberculosis gyrase type IIA topoisomerase C-terminal domain at 1.4 A resolution

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 

Literature

Mycobacterium tuberculosis DNA gyrase possesses two functional GyrA-boxes.

Bouige, A., Darmon, A., Piton, J., Roue, M., Petrella, S., Capton, E., Forterre, P., Aubry, A., Mayer, C.

(2013) Biochem.J. 455: 285-294

  • DOI: 10.1042/BJ20130430

  • PubMed Abstract: 

    • In contrast with most bacteria which possess two type II topoisomerases (topoisomerase IV and DNA gyrase), Mycobacterium tuberculosis possesses only one, DNA gyrase, which is functionally a hybrid enzyme. Functional differences between the two type I ...

    In contrast with most bacteria which possess two type II topoisomerases (topoisomerase IV and DNA gyrase), Mycobacterium tuberculosis possesses only one, DNA gyrase, which is functionally a hybrid enzyme. Functional differences between the two type IIA topoisomerases are thought to be specified by a CTD (C-terminal DNA-binding domain), which controls DNA recognition. To explore the molecular mechanism responsible for the hybrid functions of the M. tuberculosis DNA gyrase, we conducted a series of sequence analyses and structural and biochemical experiments with the isolated GyrA CTD and the holoenzyme. Although the CTD displayed a global structure similar to that of bona fide GyrA and ParC paralogues, it harbours a second key motif similar in all respects to that of the conserved GyrA-box sequence motif. Biochemical assays showed that the GyrA-box is responsible for DNA supercoiling, whereas the second GyrA-box-l (GyrA-box-like motif) is responsible for the enhanced decatenation activity, suggesting that the mechanistic originality of M. tuberculosis DNA gyrase depends largely on the particular DNA path around the CTD allowed for by the presence of GyrA-box-l. The results of the present study also provide, through phylogenetic exploration of the entire Corynebacterineae suborder, a new and broader insight into the functional diversity of bacterial type IIA topoisomerases.

    Organizational Affiliation: 

    *UPMC Université Paris 06, ER5, EA 1541, Laboratoire de Bactériologie-Hygiène, 91 bd de l'Hôpital, F 75013 Paris, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA gyrase subunit A
A
327Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Gene Names: gyrA
EC: 5.99.1.3
Find proteins for P9WG47 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WG47
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.185 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 38.700α = 90.00
b = 80.519β = 90.00
c = 88.182γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
BUSTERrefinement
ADSCdata collection
AMoREphasing
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-08-07
    Type: Initial release
  • Version 1.1: 2013-10-23
    Type: Database references