2WV9

Crystal Structure of the NS3 protease-helicase from Murray Valley encephalitis virus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.267 
  • R-Value Observed: 0.268 

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This is version 1.1 of the entry. See complete history


Literature

Crystal Structure of a Novel Conformational State of the Flavivirus Ns3 Protein: Implications for Polyprotein Processing and Viral Replication.

Assenberg, R.Mastrangelo, E.Walter, T.S.Verma, A.Milani, M.Owens, R.J.Stuart, D.I.Grimes, J.M.Mancini, E.J.

(2009) J Virol 83: 12895

  • DOI: 10.1128/JVI.00942-09
  • Primary Citation of Related Structures:  
    2WV9

  • PubMed Abstract: 
  • The flavivirus genome comprises a single strand of positive-sense RNA, which is translated into a polyprotein and cleaved by a combination of viral and host proteases to yield functional proteins. One of these, nonstructural protein 3 (NS3), is an en ...

    The flavivirus genome comprises a single strand of positive-sense RNA, which is translated into a polyprotein and cleaved by a combination of viral and host proteases to yield functional proteins. One of these, nonstructural protein 3 (NS3), is an enzyme with both serine protease and NTPase/helicase activities. NS3 plays a central role in the flavivirus life cycle: the NS3 N-terminal serine protease together with its essential cofactor NS2B is involved in the processing of the polyprotein, whereas the NS3 C-terminal NTPase/helicase is responsible for ATP-dependent RNA strand separation during replication. An unresolved question remains regarding why NS3 appears to encode two apparently disconnected functionalities within one protein. Here we report the 2.75-A-resolution crystal structure of full-length Murray Valley encephalitis virus NS3 fused with the protease activation peptide of NS2B. The biochemical characterization of this construct suggests that the protease has little influence on the helicase activity and vice versa. This finding is in agreement with the structural data, revealing a single protein with two essentially segregated globular domains. Comparison of the structure with that of dengue virus type 4 NS2B-NS3 reveals a relative orientation of the two domains that is radically different between the two structures. Our analysis suggests that the relative domain-domain orientation in NS3 is highly variable and dictated by a flexible interdomain linker. The possible implications of this conformational flexibility for the function of NS3 are discussed.


    Organizational Affiliation

    Division of Structural Biology, the Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
FLAVIVIRIN PROTEASE NS2B REGULATORY SUBUNIT, FLAVIVIRIN PROTEASE NS3 CATALYTIC SUBUNITA673Murray valley encephalitis virus (strain MVE-1-51)Mutation(s): 0 
EC: 3.4.21.91 (PDB Primary Data), 3.6.1.15 (UniProt), 3.6.4.13 (UniProt), 2.1.1.56 (UniProt), 2.1.1.57 (UniProt), 2.7.7.48 (UniProt)
Find proteins for P05769 (Murray valley encephalitis virus (strain MVE-1-51))
Explore P05769 
Go to UniProtKB:  P05769
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.267 
  • R-Value Observed: 0.268 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.91α = 90
b = 105.46β = 97.42
c = 80.068γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-12-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance