Nucleotide-free stalkless-MxA

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.213 

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This is version 1.2 of the entry. See complete history


Transient Dimerization of Human MxA Promotes GTP Hydrolysis, Resulting in a Mechanical Power Stroke.

Rennie, M.L.McKelvie, S.A.Bulloch, E.M.Kingston, R.L.

(2014) Structure 22: 1433-1445

  • DOI: https://doi.org/10.1016/j.str.2014.08.015
  • Primary Citation of Related Structures:  
    4P4S, 4P4T, 4P4U

  • PubMed Abstract: 

    Myxovirus resistance (Mx) proteins restrict replication of numerous viruses. They are closely related to membrane-remodeling fission GTPases, such as dynamin. Mx proteins can tubulate lipids and form rings or filaments that may interact directly with viral structures. GTPase domain dimerization is thought to allow crosstalk between the rungs of a tubular or helical assembly, facilitating constriction. We demonstrate that the GTPase domain of MxA dimerizes to facilitate catalysis, in a fashion analogous to dynamin. GTP binding is associated with the lever-like movement of structures adjacent to the GTPase domain, while GTP hydrolysis returns MxA to its resting state. Dimerization is not significantly promoted by substrate binding and occurs only transiently, yet is central to catalytic efficiency. Therefore, we suggest dimerization functions to coordinate the activity of spatially adjacent Mx molecules within an assembly, allowing their mechanical power strokes to be synchronized at key points in the contractile cycle.

  • Organizational Affiliation

    Maurice Wilkins Centre, School of Biological Sciences, University of Auckland, Auckland 1010, New Zealand.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Interferon-induced GTP-binding protein Mx1363Homo sapiensMutation(s): 3 
Gene Names: MX1
UniProt & NIH Common Fund Data Resources
Find proteins for P20591 (Homo sapiens)
Explore P20591 
Go to UniProtKB:  P20591
PHAROS:  P20591
GTEx:  ENSG00000157601 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP20591
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.213 
  • Space Group: I 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.33α = 90
b = 77β = 90
c = 205.95γ = 90
Software Package:
Software NamePurpose

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Maurice Wilkins Centre, Auckland Medical Research FoundationNew Zealand--

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-05
    Type: Initial release
  • Version 1.1: 2016-07-20
    Changes: Data collection
  • Version 1.2: 2023-12-27
    Changes: Data collection, Database references, Derived calculations