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Q20NV8

- NRAM_I80AD

UniProt

Q20NV8 - NRAM_I80AD

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Protein

Neuraminidase

Gene

NA

Organism
Influenza A virus (strain A/Gull/Minnesota/945/1980 H13N6)
Status
Reviewed - Annotation score: 5 out of 5- Protein inferred from homologyi

Functioni

Catalyzes the removal of terminal sialic acid residues from viral and cellular glycoconjugates. Cleaves off the terminal sialic acids on the glycosylated HA during virus budding to facilitate virus release. Additionally helps virus spread through the circulation by further removing sialic acids from the cell surface. These cleavages prevent self-aggregation and ensure the efficient spread of the progeny virus from cell to cell. Otherwise, infection would be limited to one round of replication. Described as a receptor-destroying enzyme because it cleaves a terminal sialic acid from the cellular receptors. May facilitate viral invasion of the upper airways by cleaving the sialic acid moities on the mucin of the airway epithelial cells. Likely to plays a role in the budding process through its association with lipid rafts during intracellular transport. May additionally display a raft-association independent effect on budding. Plays a role in the determination of host range restriction on replication and virulence. Sialidase activity in late endosome/lysosome traffic seems to enhance virus replication.

Catalytic activityi

Hydrolysis of alpha-(2->3)-, alpha-(2->6)-, alpha-(2->8)- glycosidic linkages of terminal sialic acid residues in oligosaccharides, glycoproteins, glycolipids, colominic acid and synthetic substrates.

Cofactori

Binds 1 calcium ion per subunit.By similarity

Enzyme regulationi

Inhibited by the neuraminidase inhibitors zanamivir (Relenza) and oseltamivir (Tamiflu). These drugs interfere with the release of progeny virus from infected cells and are effective against all influenza strains. Resistance to neuraminidase inhibitors is quite rare.

Sites

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Binding sitei119 – 1191SubstrateBy similarity
Active sitei152 – 1521Proton donor/acceptorBy similarity
Binding sitei153 – 1531SubstrateBy similarity
Binding sitei294 – 2941SubstrateBy similarity
Metal bindingi295 – 2951Calcium; via carbonyl oxygenBy similarity
Metal bindingi299 – 2991Calcium; via carbonyl oxygenBy similarity
Metal bindingi326 – 3261CalciumBy similarity
Binding sitei373 – 3731SubstrateBy similarity
Active sitei407 – 4071NucleophileBy similarity

GO - Molecular functioni

  1. exo-alpha-(2->3)-sialidase activity Source: UniProtKB-EC
  2. exo-alpha-(2->6)-sialidase activity Source: UniProtKB-EC
  3. exo-alpha-(2->8)-sialidase activity Source: UniProtKB-EC
  4. metal ion binding Source: UniProtKB-KW

GO - Biological processi

  1. carbohydrate metabolic process Source: InterPro
Complete GO annotation...

Keywords - Molecular functioni

Glycosidase, Hydrolase

Keywords - Ligandi

Calcium, Metal-binding

Names & Taxonomyi

Protein namesi
Recommended name:
Neuraminidase (EC:3.2.1.18)
Gene namesi
Name:NA
OrganismiInfluenza A virus (strain A/Gull/Minnesota/945/1980 H13N6)
Taxonomic identifieri385597 [NCBI]
Taxonomic lineageiVirusesssRNA negative-strand virusesOrthomyxoviridaeInfluenzavirus A
Virus hostiAves [TaxID: 8782]
ProteomesiUP000008581: Genome

Subcellular locationi

Virion membrane By similarity. Host apical cell membrane By similarity; Single-pass type II membrane protein By similarity
Note: Preferentially accumulates at the apical plasma membrane in infected polarized epithelial cells, which is the virus assembly site. Uses lipid rafts for cell surface transport and apical sorting. In the virion, forms a mushroom-shaped spike on the surface of the membrane By similarity.By similarity

GO - Cellular componenti

  1. host cell plasma membrane Source: UniProtKB-KW
  2. integral component of membrane Source: UniProtKB-KW
  3. virion membrane Source: InterPro
Complete GO annotation...

Keywords - Cellular componenti

Host cell membrane, Host membrane, Membrane, Virion

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini1 – 471471NeuraminidasePRO_0000280135Add
BLAST

Amino acid modifications

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Glycosylationi51 – 511N-linked (GlcNAc...); by hostSequence Analysis
Glycosylationi54 – 541N-linked (GlcNAc...); by hostSequence Analysis
Glycosylationi63 – 631N-linked (GlcNAc...); by hostSequence Analysis
Glycosylationi68 – 681N-linked (GlcNAc...); by hostSequence Analysis
Glycosylationi71 – 711N-linked (GlcNAc...); by hostSequence Analysis
Glycosylationi87 – 871N-linked (GlcNAc...); by hostSequence Analysis
Disulfide bondi93 ↔ 420By similarity
Disulfide bondi125 ↔ 130By similarity
Glycosylationi147 – 1471N-linked (GlcNAc...); by hostSequence Analysis
Disulfide bondi177 ↔ 195By similarity
Disulfide bondi185 ↔ 232By similarity
Glycosylationi202 – 2021N-linked (GlcNAc...); by hostSequence Analysis
Disulfide bondi234 ↔ 239By similarity
Disulfide bondi280 ↔ 293By similarity
Disulfide bondi282 ↔ 291By similarity
Disulfide bondi320 ↔ 338By similarity
Glycosylationi403 – 4031N-linked (GlcNAc...); by hostSequence Analysis
Disulfide bondi424 ↔ 450By similarity

Post-translational modificationi

N-glycosylated.By similarity

Keywords - PTMi

Disulfide bond, Glycoprotein

Interactioni

Subunit structurei

Homotetramer.By similarity

Structurei

3D structure databases

ProteinModelPortaliQ20NV8.
SMRiQ20NV8. Positions 83-471.
ModBaseiSearch...
MobiDBiSearch...

Topological domain

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Topological domaini1 – 66IntravirionSequence Analysis
Topological domaini28 – 471444Virion surfaceSequence AnalysisAdd
BLAST

Transmembrane

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Transmembranei7 – 2721Helical; Signal-anchor for type II membrane proteinSequence AnalysisAdd
BLAST

Family & Domainsi

Region

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Regioni11 – 3323Involved in apical transport and lipid raft associationBy similarityAdd
BLAST
Regioni36 – 9156Hypervariable stalk regionBy similarityAdd
BLAST
Regioni92 – 471380Head of neuraminidaseBy similarityAdd
BLAST
Regioni278 – 2792Substrate bindingBy similarity

Domaini

Intact N-terminus is essential for virion morphogenesis. Possess two apical sorting signals, one in the ectodomain, which is likely to be a glycan, and the other in the transmembrane domain. The transmembrane domain also plays a role in lipid raft association By similarity.By similarity

Sequence similaritiesi

Belongs to the glycosyl hydrolase 34 family.Curated

Keywords - Domaini

Signal-anchor, Transmembrane, Transmembrane helix

Family and domain databases

Gene3Di2.120.10.10. 1 hit.
InterProiIPR001860. Glyco_hydro_34.
IPR011040. Sialidases.
[Graphical view]
PfamiPF00064. Neur. 1 hit.
[Graphical view]
SUPFAMiSSF50939. SSF50939. 1 hit.

Sequencei

Sequence statusi: Complete.

Q20NV8-1 [UniParc]FASTAAdd to Basket

« Hide

        10         20         30         40         50
MNPNQKIICI SATGMTLSVV SLLVGIANLG LNIGLHYKVG YTPDVNTPNV
60 70 80 90 100
NGTNSTTTTI INNNTQNNFT NITNIIQNKN EERTFLNLTK PLCEVNSWHI
110 120 130 140 150
LSKDNAIRIG EDANILVTRE PYLSCDPQGC RMFALSQGTT LKGRHANGTI
160 170 180 190 200
HDRSPFRALV SWEMGQAPSP YNAKIECIGW SSTSCHDGIS RMSICMSGPN
210 220 230 240 250
NNASAVVWYG GRPVTEIPSW AGNILRTQES ECVCHKGICP VVMTDGPANN
260 270 280 290 300
KAATKIIYFK EGKIQKIEEL TGTAQHIEEC SCYGAKEVIK CICRDNWKGA
310 320 330 340 350
NRPVITIDPD MMTHTSKYLC SKILTDTSRP NDPNNGNCDA PITGGGPDPG
360 370 380 390 400
VKGFAFLDGE NSWLGRTISK DSRSGYEVLK VPNAETNTQS GPITHQIIVN
410 420 430 440 450
NQNWSGYSGA FIDYWANKEC FNPCFYVELI RGRPKESSVL WTSNSIVALC
460 470
GSRERLGSWS WHDGAEITYF K
Length:471
Mass (Da):51,775
Last modified:April 18, 2006 - v1
Checksum:iE43232C661501B40
GO

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
CY005860 Genomic RNA. Translation: ABB21764.1.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
CY005860 Genomic RNA. Translation: ABB21764.1 .

3D structure databases

ProteinModelPortali Q20NV8.
SMRi Q20NV8. Positions 83-471.
ModBasei Search...
MobiDBi Search...

Protocols and materials databases

Structural Biology Knowledgebase Search...

Family and domain databases

Gene3Di 2.120.10.10. 1 hit.
InterProi IPR001860. Glyco_hydro_34.
IPR011040. Sialidases.
[Graphical view ]
Pfami PF00064. Neur. 1 hit.
[Graphical view ]
SUPFAMi SSF50939. SSF50939. 1 hit.
ProtoNeti Search...

Publicationsi

  1. Cited for: NUCLEOTIDE SEQUENCE [GENOMIC RNA].
  2. "Assembly and budding of influenza virus."
    Nayak D.P., Hui E.K., Barman S.
    Virus Res. 106:147-165(2004) [PubMed] [Europe PMC] [Abstract]
    Cited for: REVIEW.
  3. "Neuraminidase inhibitors for influenza."
    Moscona A.
    N. Engl. J. Med. 353:1363-1373(2005) [PubMed] [Europe PMC] [Abstract]
    Cited for: REVIEW.
  4. "Sialobiology of influenza: molecular mechanism of host range variation of influenza viruses."
    Suzuki Y.
    Biol. Pharm. Bull. 28:399-408(2005) [PubMed] [Europe PMC] [Abstract]
    Cited for: REVIEW.

Entry informationi

Entry nameiNRAM_I80AD
AccessioniPrimary (citable) accession number: Q20NV8
Entry historyi
Integrated into UniProtKB/Swiss-Prot: March 6, 2007
Last sequence update: April 18, 2006
Last modified: October 29, 2014
This is version 49 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programViral Protein Annotation Program

Miscellaneousi

Miscellaneous

The influenza A genome consist of 8 RNA segments. Genetic variation of hemagglutinin and/or neuraminidase genes results in the emergence of new influenza strains. The mechanism of variation can be the result of point mutations or the result of genetic reassortment between segments of two different strains.

Keywords - Technical termi

Complete proteome

Documents

  1. Glycosyl hydrolases
    Classification of glycosyl hydrolase families and list of entries
  2. SIMILARITY comments
    Index of protein domains and families

External Data

Dasty 3