4MN4

Structural Basis for the MukB-topoisomerase IV Interaction


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.204 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis for the MukB-topoisomerase IV interaction and its functional implications in vivo.

Vos, S.M.Stewart, N.K.Oakley, M.G.Berger, J.M.

(2013) Embo J. 32: 2950-2962

  • DOI: 10.1038/emboj.2013.218

  • PubMed Abstract: 
  • Chromosome partitioning in Escherichia coli is assisted by two interacting proteins, topoisomerase (topo) IV and MukB. MukB stimulates the relaxation of negative supercoils by topo IV; to understand the mechanism of their action and to define this fu ...

    Chromosome partitioning in Escherichia coli is assisted by two interacting proteins, topoisomerase (topo) IV and MukB. MukB stimulates the relaxation of negative supercoils by topo IV; to understand the mechanism of their action and to define this functional interplay, we determined the crystal structure of a minimal MukB-topo IV complex to 2.3 Å resolution. The structure shows that the so-called 'hinge' region of MukB forms a heterotetrameric assembly with a C-terminal DNA binding domain (CTD) on topo IV's ParC subunit. Biochemical studies show that the hinge stimulates topo IV by competing for a site on the CTD that normally represses activity on negatively supercoiled DNA, while complementation tests using mutants implicated in the interaction reveal that the cellular dependency on topo IV derives from a joint need for both strand passage and MukB binding. Interestingly, the configuration of the MukB·topo IV complex sterically disfavours intradimeric interactions, indicating that the proteins may form oligomeric arrays with one another, and suggesting a framework by which MukB and topo IV may collaborate during daughter chromosome disentanglement.


    Organizational Affiliation

    Department of Molecular and Cell Biology, University of California, Berkeley, CA, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA topoisomerase 4 subunit A
A, B
259Escherichia coli (strain K12)Gene Names: parC
EC: 5.99.1.3
Find proteins for P0AFI2 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AFI2
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Chromosome partition protein MukB
C, D
163Escherichia coli (strain K12)Gene Names: mukB
Find proteins for P22523 (Escherichia coli (strain K12))
Go to UniProtKB:  P22523
Small Molecules
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: 2.3 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.204 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 49.767α = 90.00
b = 103.737β = 90.00
c = 186.611γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
Blu-Icedata collection
PHENIXmodel building
PHENIXrefinement
PHENIXphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-10-23
    Type: Initial release
  • Version 1.1: 2014-01-22
    Type: Database references