2Q06 : Crystal structure of Influenza A Virus H5N1 Nucleoprotein

  • Jun Wang (Contributor)
  • Andy Ka-Leung Ng (Contributor)
  • Hongmin Zhang (Contributor)
  • Kemin Tan (Contributor)
  • Jia Huai Wang (Contributor)
  • Pang-Chui Shaw (Contributor)



Experimental Technique/Method:X-RAY DIFFRACTION
Release Date:2008-05-27
Deposition Date:2007-05-21
Revision Date:2011-07-13
Molecular Weight:113686.73
Macromolecule Type:Protein
Residue Count:1008
Atom Site Count:7343

The threat of a pandemic outbreak of influenza virus A H5N1 has become a major concern worldwide. The nucleoprotein (NP) of the virus binds the RNA genome and acts as a key adaptor between the virus and the host cell. It, therefore, plays an important structural and functional role and represents an attractive drug target. Here, we report the 3.3-A crystal structure of H5N1 NP, which is composed of a head domain, a body domain, and a tail loop. Our structure resolves the important linker segments (residues 397-401, 429-437) that connect the tail loop with the remainder of the molecule and a flexible, basic loop (residues 73-91) located in an arginine-rich groove surrounding Arg150. Using surface plasmon resonance, we found the basic loop and arginine-rich groove, but mostly a protruding element containing Arg174 and Arg175, to be important in RNA binding by NP. We also used our crystal structure to build a ring-shaped assembly of nine NP subunits to model the miniribonucleoprotein particle previously visualized by electron microscopy. Our study of H5N1 NP provides insight into the oligomerization interface and the RNA-binding groove, which are attractive drug targets, and it identifies the epitopes that might be used for universal vaccine development.
Date made available2008

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