2R7J

Crystal Structure of rotavirus non structural protein NSP2 with H225A mutation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.226 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystallographic and Biochemical Analysis of Rotavirus NSP2 with Nucleotides Reveals a Nucleoside Diphosphate Kinase-Like Activity

Kumar, M.Jayaram, H.Vasquez-Del Carpio, R.Jiang, X.Taraporewala, Z.F.Jacobson, R.H.Patton, J.T.Prasad, B.V.V.

(2007) J.Virol. 81: 12272-12284

  • DOI: 10.1128/JVI.00984-07
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Rotavirus, the major pathogen of infantile gastroenteritis, carries a nonstructural protein, NSP2, essential for viroplasm formation and genome replication/packaging. In addition to RNA-binding and helix-destabilizing properties, NSP2 exhibits nucleo ...

    Rotavirus, the major pathogen of infantile gastroenteritis, carries a nonstructural protein, NSP2, essential for viroplasm formation and genome replication/packaging. In addition to RNA-binding and helix-destabilizing properties, NSP2 exhibits nucleoside triphosphatase activity. A conserved histidine (H225) functions as the catalytic residue for this enzymatic activity, and mutation of this residue abrogates genomic double-stranded RNA synthesis without affecting viroplasm formation. To understand the structural basis of the phosphatase activity of NSP2, we performed crystallographic analyses of native NSP2 and a functionally defective H225A mutant in the presence of nucleotides. These studies showed that nucleotides bind inside a cleft between the two domains of NSP2 in a region that exhibits structural similarity to ubiquitous cellular HIT (histidine triad) proteins. Only minor conformational alterations were observed in the cleft upon nucleotide binding and hydrolysis. This hydrolysis involved the formation of a stable phosphohistidine intermediate. These observations, reminiscent of cellular nucleoside diphosphate (NDP) kinases, prompted us to investigate whether NSP2 exhibits phosphoryl-transfer activity. Bioluminometric assay showed that NSP2 exhibits an NDP kinase-like activity that transfers the bound phosphate to NDPs. However, NSP2 is distinct from the highly conserved cellular NDP kinases in both its structure and catalytic mechanism, thus making NSP2 a potential target for antiviral drug design. With structural similarities to HIT proteins, which are not known to exhibit NDP kinase activity, NSP2 represents a unique example among structure-activity relationships. The newly observed phosphoryl-transfer activity of NSP2 may be utilized for homeostasis of nucleotide pools in viroplasms during genome replication.


    Related Citations: 
    • Rotavirus protein involved in genome replication and packaging exhibits a HIT-like fold
      Jayaram, H.,Taraporewala, Z.,Patton, J.T.,Prasad, B.V.V.
      (2002) Nature 417: 311


    Organizational Affiliation

    Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Non-structural RNA-binding protein 35
A
317Rotavirus A (strain RVA/SA11-Ramig/G3P[X])Mutation(s): 1 
EC: 3.6.4.-
Find proteins for Q03243 (Rotavirus A (strain RVA/SA11-Ramig/G3P[X]))
Go to UniProtKB:  Q03243
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.226 
  • Space Group: I 4 2 2
Unit Cell:
Length (Å)Angle (°)
a = 106.963α = 90.00
b = 106.963β = 90.00
c = 151.147γ = 90.00
Software Package:
Software NamePurpose
HKL-3000data reduction
HKL-3000data collection
AMoREphasing
HKL-3000data scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-10-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance