MglA bound to GDP in P1 tetrameric arrangement

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.212 

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Structural analysis of the Ras-like G protein MglA and its cognate GAP MglB and implications for bacterial polarity.

Miertzschke, M.Koerner, C.Vetter, I.R.Keilberg, D.Hot, E.Leonardy, S.Sogaard-Andersen, L.Wittinghofer, A.

(2011) EMBO J 30: 4185-4197

  • DOI: https://doi.org/10.1038/emboj.2011.291
  • Primary Citation of Related Structures:  
    3T12, 3T1O, 3T1Q, 3T1R, 3T1S, 3T1T, 3T1V, 3T1X

  • PubMed Abstract: 

    The bacterium Myxococcus xanthus uses a G protein cycle to dynamically regulate the leading/lagging pole polarity axis. The G protein MglA is regulated by its GTPase-activating protein (GAP) MglB, thus resembling Ras family proteins. Here, we show structurally and biochemically that MglA undergoes a dramatic, GDP-GTP-dependent conformational change involving a screw-type forward movement of the central β2-strand, never observed in any other G protein. This movement and complex formation with MglB repositions the conserved residues Arg53 and Gln82 into the active site. Residues required for catalysis are thus not provided by the GAP MglB, but by MglA itself. MglB is a Roadblock/LC7 protein and functions as a dimer to stimulate GTP hydrolysis in a 2:1 complex with MglA. In vivo analyses demonstrate that hydrolysis mutants abrogate Myxococcus' ability to regulate its polarity axis changing the reversal behaviour from stochastic to oscillatory and that both MglA GTPase activity and MglB GAP catalysis are essential for maintaining a proper polarity axis.

  • Organizational Affiliation

    Structural Biology Group, Max-Planck-Institute for Molecular Physiology, Dortmund, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Gliding protein mglA
A, B, C, D
198Thermus thermophilus HB8Mutation(s): 0 
Gene Names: TTHA1132
Find proteins for Q5SJ82 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore Q5SJ82 
Go to UniProtKB:  Q5SJ82
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5SJ82
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.212 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.69α = 99.91
b = 62.86β = 100.14
c = 81.47γ = 108.54
Software Package:
Software NamePurpose
PROdata collection
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-08-31
    Type: Initial release
  • Version 1.1: 2011-11-02
    Changes: Database references