Myxococcus xanthus MglA in GDP bound conformation

Experimental Data Snapshot

  • Resolution: 1.35 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.152 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Allosteric regulation of a prokaryotic small Ras-like GTPase contributes to cell polarity oscillations in bacterial motility.

Baranwal, J.Lhospice, S.Kanade, M.Chakraborty, S.Gade, P.R.Harne, S.Herrou, J.Mignot, T.Gayathri, P.

(2019) PLoS Biol 17: e3000459-e3000459

  • DOI: https://doi.org/10.1371/journal.pbio.3000459
  • Primary Citation of Related Structures:  
    5YMX, 6IZW

  • PubMed Abstract: 

    Mutual gliding motility A (MglA), a small Ras-like GTPase; Mutual gliding motility B (MglB), its GTPase activating protein (GAP); and Required for Motility Response Regulator (RomR), a protein that contains a response regulator receiver domain, are major components of a GTPase-dependent biochemical oscillator that drives cell polarity reversals in the bacterium Myxococcus xanthus. We report the crystal structure of a complex of M. xanthus MglA and MglB, which reveals that the C-terminal helix (Ct-helix) from one protomer of the dimeric MglB binds to a pocket distal to the active site of MglA. MglB increases the GTPase activity of MglA by reorientation of key catalytic residues of MglA (a GAP function) combined with allosteric regulation of nucleotide exchange by the Ct-helix (a guanine nucleotide exchange factor [GEF] function). The dual GAP-GEF activities of MglB accelerate the rate of GTP hydrolysis over multiple enzymatic cycles. Consistent with its GAP and GEF activities, MglB interacts with MglA bound to either GTP or GDP. The regulation is essential for cell polarity, because deletion of the Ct-helix causes bipolar localization of MglA, MglB, and RomR, thereby causing reversal defects in M. xanthus. A bioinformatics analysis reveals the presence of Ct-helix in homologues of MglB in other bacterial phyla, suggestive of the prevalence of the allosteric mechanism among other prokaryotic small Ras-like GTPases.

  • Organizational Affiliation

    Indian Institute of Science Education and Research, Pune, India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mutual gliding-motility protein MglA
A, B
203Myxococcus xanthus DK 1622Mutation(s): 0 
Gene Names: mglAMXAN_1925
Find proteins for Q1DB04 (Myxococcus xanthus (strain DK1622))
Explore Q1DB04 
Go to UniProtKB:  Q1DB04
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ1DB04
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on GDP

Download Ideal Coordinates CCD File 
C [auth A],
G [auth B]
C10 H15 N5 O11 P2
Query on MPD

Download Ideal Coordinates CCD File 
C6 H14 O2
Query on IMD

Download Ideal Coordinates CCD File 
D [auth A],
H [auth B]
C3 H5 N2
Query on EDO

Download Ideal Coordinates CCD File 
E [auth A],
I [auth B]
C2 H6 O2
Experimental Data & Validation

Experimental Data

  • Resolution: 1.35 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.152 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.34α = 90
b = 68.61β = 90
c = 89.42γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-24
    Type: Initial release
  • Version 1.1: 2019-10-16
    Changes: Data collection, Database references
  • Version 1.2: 2023-11-22
    Changes: Data collection, Database references, Refinement description