4X0R

Crystal structure of human MxB stalk domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.905 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.218 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural insight into the assembly of human anti-HIV dynamin-like protein MxB/Mx2.

Xu, B.Kong, J.Wang, X.Wei, W.Xie, W.Yu, X.F.

(2015) Biochem.Biophys.Res.Commun. 456: 197-201

  • DOI: 10.1016/j.bbrc.2014.11.058

  • PubMed Abstract: 
  • Interferon (IFN) is a key component of the innate immune response to exogenous pathogens. Interferon increases the mRNA levels of interferon-stimulated genes (ISGs) in vivo, which is thought to account for its antiviral activity. Recent studies have ...

    Interferon (IFN) is a key component of the innate immune response to exogenous pathogens. Interferon increases the mRNA levels of interferon-stimulated genes (ISGs) in vivo, which is thought to account for its antiviral activity. Recent studies have indicated that human myxovirus resistance protein 2 (Mx2 or MxB), one of these ISGs, contributes to the inhibition of HIV-1 replication by interferon. MxB may bind to HIV-1 relatively late in the post-entry phase, and it leads to a reduced level of integrated viral DNA, thereby restricting HIV-1 infection. The N-terminal 91-aa domain of MxB and the assembly of MxB mediated by the Stalk domain have also been shown to be indispensible for MxB's anti-viral functions, but the mechanism involved has remained elusive. Here, we report the crystal structure (2.9Å) of the human MxB Stalk domain. MxB Stalk shows one dimer in the asymmetric unit. Each monomer contains a four-helix bundle. Interestingly, analyses of MxB dimer interfaces show that the majority of residues involved in the interface are not conserved between MxB and MxA, contributing to the building of a more stable MxB dimer. MxA and MxB Stalk domains share 46.7% sequence identity, and the structure of the MxA Stalk domain and the overall structure of MxB Stalk have a similar conformation. Our results indicate that although human Mx proteins share common structural characteristics, their dimerization strategies are unique, contributing to their unique contributions to viral restriction.


    Organizational Affiliation

    School of Life Sciences, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Interferon-induced GTP-binding protein Mx2
B, A
239Homo sapiensMutation(s): 4 
Gene Names: MX2
Find proteins for P20592 (Homo sapiens)
Go to Gene View: MX2
Go to UniProtKB:  P20592
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.905 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.218 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 154.612α = 90.00
b = 154.612β = 90.00
c = 103.340γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data scaling
PHASERphasing
PHENIXrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2014-11-23 
  • Released Date: 2014-12-10 
  • Deposition Author(s): Yu, X.-F., Xie, W.

Revision History 

  • Version 1.0: 2014-12-10
    Type: Initial release
  • Version 1.1: 2014-12-24
    Type: Database references
  • Version 1.2: 2015-01-21
    Type: Database references