3NUH

A domain insertion in E. coli GyrB adopts a novel fold that plays a critical role in gyrase function


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.103 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.234 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

A domain insertion in Escherichia coli GyrB adopts a novel fold that plays a critical role in gyrase function.

Schoeffler, A.J.May, A.P.Berger, J.M.

(2010) Nucleic Acids Res. 38: 7830-7844

  • DOI: 10.1093/nar/gkq665

  • PubMed Abstract: 
  • DNA topoisomerases manage chromosome supercoiling and organization in all forms of life. Gyrase, a prokaryotic heterotetrameric type IIA topo, introduces negative supercoils into DNA by an ATP-dependent strand passage mechanism. All gyrase orthologs ...

    DNA topoisomerases manage chromosome supercoiling and organization in all forms of life. Gyrase, a prokaryotic heterotetrameric type IIA topo, introduces negative supercoils into DNA by an ATP-dependent strand passage mechanism. All gyrase orthologs rely on a homologous set of catalytic domains for function; however, these enzymes also can possess species-specific auxiliary regions. The gyrases of many gram-negative bacteria harbor a 170-amino acid insertion of unknown architecture and function in the metal- and DNA-binding TOPRIM domain of the GyrB subunit. We have determined the structure of the 212 kDa Escherichia coli gyrase DNA binding and cleavage core containing this insert to 3.1 Å resolution. We find that the insert adopts a novel, extended fold that braces the GyrB TOPRIM domain against the coiled-coil arms of its partner GyrA subunit. Structure-guided deletion of the insert greatly reduces the DNA binding, supercoiling and DNA-stimulated ATPase activities of gyrase. Mutation of a single amino acid at the contact point between the insert and GyrA more modestly impairs supercoiling and ATP turnover, and does not affect DNA binding. Our data indicate that the insert has two functions, acting as a steric buttress to pre-configure the primary DNA-binding site, and serving as a relay that may help coordinate communication between different functional domains.


    Organizational Affiliation

    Department of Molecular and Cell Biology, California Institute for Quantitative Biosciences, University of California, Berkeley and Fluidigm Corporation, South San Francisco, CA 94080, USA. jmberger@berkeley.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA gyrase subunit A
A
525Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: gyrA (hisW, nalA, parD)
EC: 5.99.1.3
Find proteins for P0AES4 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AES4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
DNA gyrase subunit B
B
420Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: gyrB (acrB, cou, himB, hisU, nalC, parA, pcbA)
EC: 5.99.1.3
Find proteins for P0AES6 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AES6
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.103 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.234 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 108.062α = 90.00
b = 147.493β = 90.00
c = 138.870γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-08-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance