An official website of the United States government

Non-structural protein 1 (Influenza A virus (A/turkey/Ontario/6118/1968(H8N4)))

Protein
Dates
  • Create:
    2017-04-15
  • Modify:
    2025-01-19
Description
An influenzavirus non-structural protein 1 that is encoded in the genome of the H8N4 strain A/Turkey/Ontario/6118/1968.
Inhibits post-transcriptional processing of cellular pre-mRNA, by binding and inhibiting two cellular proteins that are required for the 3'-end processing of cellular pre-mRNAs: the 30 kDa cleavage and polyadenylation specificity factor/CPSF4 and the poly(A)-binding protein 2/PABPN1. In turn, unprocessed 3' end pre-mRNAs accumulate in the host nucleus and are no longer exported to the cytoplasm. Cellular protein synthesis is thereby shut off very early after virus infection. Viral protein synthesis is not affected by the inhibition of the cellular 3' end processing machinery because the poly(A) tails of viral mRNAs are produced by the viral polymerase through a stuttering mechanism. Prevents the establishment of the cellular antiviral state by inhibiting TRIM25-mediated RIGI ubiquitination, which normally triggers the antiviral transduction signal that leads to the activation of type I IFN genes by transcription factors IRF3 and IRF7. Also binds poly(A) and U6 snRNA. Inhibits the integrated stress response (ISR) in the infected cell by blocking dsRNA binding by EIF2AK2/PKR and further phosphorylation of EIF2S1/EIF-2ALPHA. Stress granule formation is thus inhibited, which allows protein synthesis and viral replication.

1 Names and Identifiers

1.1 Synonyms

  • Non-structural protein 1
  • NS1
  • NS1A

1.2 Other Identifiers

1.2.1 UniProt ID

1.2.2 PRO ID

1.2.3 InterPro Protein

3 Sequence

>sp|Q0A462|NS1_I68A3 Non-structural protein 1 (Run BLAST)

MDSNTVSSFQVDCFLWHVRKRFADQELGDAPFLDRLRRDQKSLRGRGSTLGLDIETATRAGKQIVERILEEESDEALKMTIASVPASRYLTDMTLEEMSRDWFMLMPKQKVAGSLCIRMDQAIMDKNIILKANFSVIFDRLETLILLRAFTEEGAIVGEISPLPSLPGHIDEDVKNAIGVLIGGLEWNDNTVRVSETLQRFAWRSSNEDGRPPLPPKQKRKMARTIESEV

4 Domains

4.1 CDD Domains

4.2 InterPro Domains

5 Literature

5.1 Consolidated References

6 Patents

7 Information Sources

  1. NCBI Protein
    LICENSE
    NCBI Website and Data Usage Policies and Disclaimers
    https://www.ncbi.nlm.nih.gov/home/about/policies/
  2. PubChem
  3. InterPro
    LICENSE
    All of the InterPro, Pfam, PRINTS and SFLD downloadable data provided on the InterPro website is freely available under CC0 1.0 Universal (CC0 1.0) Public Domain Dedication.
    https://www.ebi.ac.uk/interpro/about/license/
  4. NCBI Conserved Domains (CDD)
    LICENSE
    NCBI Website and Data Usage Policies and Disclaimers
    https://www.ncbi.nlm.nih.gov/home/about/policies/
  5. Protein Ontology
    LICENSE
    PRO is distributed under the Creative Commons CC-BY 4.0 license (https://creativecommons.org/licenses/by/4.0/).
  6. UniProt
    LICENSE
    We have chosen to apply the Creative Commons Attribution (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/) License to all copyrightable parts of our databases.
    https://www.uniprot.org/help/license
CONTENTS