3LJB

Structural basis of oligomerisation in the MxA stalk

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.196 

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Literature

Structural basis of oligomerization in the stalk region of dynamin-like MxA.

Gao, S., von der Malsburg, A., Paeschke, S., Behlke, J., Haller, O., Kochs, G., Daumke, O.

(2010) Nature 465: 502-506

  • DOI: 10.1038/nature08972
  • Primary Citation of Related Structures:  
    3LJB

  • PubMed Abstract: 

    • The interferon-inducible dynamin-like myxovirus resistance protein 1 (MxA; also called MX1) GTPase is a key mediator of cell-autonomous innate immunity against pathogens such as influenza viruses. MxA partially localizes to COPI-positive membranes of the smooth endoplasmic reticulum-Golgi intermediate compartment ...

    The interferon-inducible dynamin-like myxovirus resistance protein 1 (MxA; also called MX1) GTPase is a key mediator of cell-autonomous innate immunity against pathogens such as influenza viruses. MxA partially localizes to COPI-positive membranes of the smooth endoplasmic reticulum-Golgi intermediate compartment. At the point of infection, it redistributes to sites of viral replication and promotes missorting of essential viral constituents. It has been proposed that the middle domain and the GTPase effector domain of dynamin-like GTPases constitute a stalk that mediates oligomerization and transmits conformational changes from the G domain to the target structure; however, the molecular architecture of this stalk has remained elusive. Here we report the crystal structure of the stalk of human MxA, which folds into a four-helical bundle. This structure tightly oligomerizes in the crystal in a criss-cross pattern involving three distinct interfaces and one loop. Mutations in each of these interaction sites interfere with native assembly, oligomerization, membrane binding and antiviral activity of MxA. On the basis of these results, we propose a structural model for dynamin oligomerization and stimulated GTP hydrolysis that is consistent with previous structural predictions and has functional implications for all members of the dynamin family.

    Organizational Affiliation: 

    Max-Delbrück-Centrum for Molecular Medicine, Crystallography, Robert-Rössle-Strasse 10, 13125 Berlin, Germany.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Interferon-induced GTP-binding protein Mx1A, B271Homo sapiensMutation(s): 0 
Gene Names: MX1
UniProt & NIH Common Fund Data Resources
Find proteins for P20591 (Homo sapiens)
Explore P20591 
Go to UniProtKB:  P20591
PHAROS:  P20591
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP20591
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.196 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.147α = 65.82
b = 57.366β = 88.47
c = 57.491γ = 74.87
Software Package:
Software NamePurpose
XDSdata scaling
MOLREPphasing
REFMACrefinement
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2010-01-26 
  • Released Date: 2010-05-05 
    • Deposition Author(s): Gao, S., Daumke, O.

Revision History  (Full details and data files)

  • Version 1.0: 2010-05-05
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance