|Proceedings of the National Academy of Sciences of the United States of America (2008) 105:13093-8|
|Northeast Structural Genomics Consortium|
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Influenza A viruses are responsible for seasonal epidemics and high mortality pandemics. ...
A major function of the viral NS1A protein, a virulence factor, is the inhibition of the production of IFN-beta mRNA and other antiviral mRNAs. The NS1A protein of the human influenza A/Udorn/72 (Ud) virus inhibits the production of these antiviral mRNAs by binding the cellular 30-kDa subunit of the cleavage and polyadenylation specificity factor (CPSF30), which is required for the 3' end processing of all cellular pre-mRNAs. Here we report the 1.95-A resolution X-ray crystal structure of the complex formed between the second and third zinc finger domain (F2F3) of CPSF30 and the C-terminal domain of the Ud NS1A protein. The complex is a tetramer, in which each of two F2F3 molecules wraps around two NS1A effector domains that interact with each other head-to-head. This structure identifies a CPSF30 binding pocket on NS1A comprised of amino acid residues that are highly conserved among human influenza A viruses. Single amino acid changes within this binding pocket eliminate CPSF30 binding, and a recombinant Ud virus expressing an NS1A protein with such a substitution is attenuated and does not inhibit IFN-beta pre-mRNA processing. This binding pocket is a potential target for antiviral drug development. The crystal structure also reveals that two amino acids outside of this pocket, F103 and M106, which are highly conserved (>99%) among influenza A viruses isolated from humans, participate in key hydrophobic interactions with F2F3 that stabilize the complex.
|metabolism chemistry immunology |
|Binding Sites Crystallography, X-Ray Humans Phenylalanine Models, Molecular Protein Structure, Secondary Protein Structure, Quaternary Amino Acid Substitution Cell Line Zinc Fingers Thermodynamics Methionine Viral Nonstructural Proteins Influenza A virus Interferon Regulatory Factor-3 |
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