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P26087

- NCAP_I81A4

UniProt

P26087 - NCAP_I81A4

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Protein
Nucleoprotein
Gene
NP
Organism
Influenza A virus (strain A/Swine/Ontario/2/1981 H1N1)
Status
Reviewed - Annotation score: 3 out of 5 - Protein inferred from homologyi

Functioni

Encapsidates the negative strand viral RNA, protecting it from nucleases. The encapsidated genomic RNA is termed the ribonucleoprotein (RNP) and serves as template for transcription and replication. The RNP needs to be localized in the nucleus to start an infectious cycle, but is too large to diffuse through the nuclear pore complex. NP comprises at least 2 nuclear localization signals and is responsible of the active RNP import into the nucleus through the cellular importin alpha/beta pathway. Later in the infection, nucleus export of RNP are mediated through viral proteins NEP interacting with M1 which binds nucleoproteins. It is possible that the nucleoprotein binds directly exportin-1 (XPO1) and plays an active role in RNP nuclear export. M1 interaction with RNP seems to hide nucleoprotein's nuclear localization signals. Soon after a virion infects a new cell, M1 dissociates from the RNP under acidification of the virion driven by M2 protein. Dissociation of M1 from RNP unmask nucleoprotein's nuclear localization signals, targeting the RNP to the nucleus By similarity.

GO - Molecular functioni

  1. RNA binding Source: UniProtKB-KW
  2. structural molecule activity Source: InterPro

GO - Biological processi

  1. viral entry into host cell Source: UniProtKB-KW
  2. viral penetration into host nucleus Source: UniProtKB-KW
Complete GO annotation...

Keywords - Molecular functioni

Ribonucleoprotein

Keywords - Biological processi

Host-virus interaction, Viral penetration into host nucleus, Virus entry into host cell

Keywords - Ligandi

RNA-binding, Viral nucleoprotein

Names & Taxonomyi

Protein namesi
Recommended name:
Nucleoprotein
Alternative name(s):
Nucleocapsid protein
Short name:
Protein N
Gene namesi
Name:NP
OrganismiInfluenza A virus (strain A/Swine/Ontario/2/1981 H1N1)
Taxonomic identifieri384501 [NCBI]
Taxonomic lineageiVirusesssRNA negative-strand virusesOrthomyxoviridaeInfluenzavirus A
Virus hostiAves [TaxID: 8782]
Homo sapiens (Human) [TaxID: 9606]
Sus scrofa (Pig) [TaxID: 9823]

Subcellular locationi

Virion Reviewed prediction. Host nucleus

GO - Cellular componenti

  1. helical viral capsid Source: UniProtKB-KW
  2. host cell nucleus Source: UniProtKB-SubCell
  3. ribonucleoprotein complex Source: UniProtKB-KW
  4. viral nucleocapsid Source: UniProtKB-KW
Complete GO annotation...

Keywords - Cellular componenti

Capsid protein, Helical capsid protein, Host nucleus, Virion

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini1 – 498498Nucleoprotein
PRO_0000079135Add
BLAST

Post-translational modificationi

Late in virus-infected cells, may be cleaved from a 56-kDa protein to a 53-kDa protein by a cellular caspase. This cleavage might be a marker for the onset of apoptosis in infected cells or have a specific function in virus host interaction By similarity.

Interactioni

Subunit structurei

Homomultimerizes to form the nucleocapsid. May bind human exportin-1. Binds to viral genomic RNA. Protein-RNA contacts are mediated by a combination of electrostatic interactions between positively charged residues and the phosphate backbone and planar interactions between aromatic side chains and bases By similarity.

Structurei

3D structure databases

ProteinModelPortaliP26087.
SMRiP26087. Positions 22-496.

Family & Domainsi

Motif

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Motifi1 – 1818Unconventional nuclear localization signal By similarity
Add
BLAST
Motifi198 – 21619Bipartite nuclear localization signal By similarity
Add
BLAST

Sequence similaritiesi

Family and domain databases

InterProiIPR002141. Flu_NP.
[Graphical view]
PfamiPF00506. Flu_NP. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

P26087-1 [UniParc]FASTAAdd to Basket

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MASQGTKRSY EQMETGGERQ DATEIRASVG RMIGGIGRFY IQMCTELKLS    50
DYEGRLIQNS ITIERMVLSA FDERRNKYLE EHPSAGKDPK KTGGPIYRRV 100
DGKWMRELIL YDKEEIRRVW RQANNGEDAT AGLTHIMIWH SNLNDATYQR 150
TRALVRTGMD PRMCSLMQGS TLPRRSGAAG AAVKGVGTIA MELIRMIKRG 200
INDRNFWRGE NGRRTRIAYE RMCNILKGKF QTAAQRAMMD QVRESRNPGN 250
AEIEDLIFLA RSALILRGSV AHKSCLPACV YGLAVASGHD FEREGYSLVG 300
IDPFKLLQNS QVFSLIRPNE NPAHKSQLVW MACHSAAFED LRVSGFIRGK 350
KVVPRGKLST RGVQIASNEN VEAMDSSTLE LRSRYWAIRT RSGGNTNQQK 400
ASAGQISVQP TFSVQRNLPF ERATVMAAFI GNNEGRTSDM RIEIIRMMES 450
AKPEDLSFQG RGVFELSDEK ATNPIVPSFD MNNEGSYFFG DNAEEYDN 498
Length:498
Mass (Da):56,043
Last modified:May 1, 1992 - v1
Checksum:i94237149AC015D83
GO

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
M63767 Genomic RNA. Translation: AAA52266.1.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
M63767 Genomic RNA. Translation: AAA52266.1 .

3D structure databases

ProteinModelPortali P26087.
SMRi P26087. Positions 22-496.
ModBasei Search...
MobiDBi Search...

Protocols and materials databases

Structural Biology Knowledgebase Search...

Family and domain databases

InterProi IPR002141. Flu_NP.
[Graphical view ]
Pfami PF00506. Flu_NP. 1 hit.
[Graphical view ]
ProtoNeti Search...

Publicationsi

  1. "Evolution of influenza A virus nucleoprotein genes: implications for the origins of H1N1 human and classical swine viruses."
    Gorman O.T., Bean W.J., Kawaoka Y., Donatelli I., Guo Y., Webster R.G.
    J. Virol. 65:3704-3714(1991) [PubMed] [Europe PMC] [Abstract]
    Cited for: NUCLEOTIDE SEQUENCE [GENOMIC RNA].

Entry informationi

Entry nameiNCAP_I81A4
AccessioniPrimary (citable) accession number: P26087
Entry historyi
Integrated into UniProtKB/Swiss-Prot: May 1, 1992
Last sequence update: May 1, 1992
Last modified: February 19, 2014
This is version 51 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programViral Protein Annotation Program

Miscellaneousi

Documents

  1. SIMILARITY comments
    Index of protein domains and families

External Data

Dasty 3

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