[1]
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NUCLEOTIDE SEQUENCE [GENOMIC RNA].
DOI=10.1038/290213a0; PubMed=7010182 [NCBI, ExPASy, EBI, Israel, Japan]
Fields S.,
Winter G.,
Brownlee G.G.;
"Structure of the neuraminidase gene in human influenza virus A/PR/8/34.";
Nature 290:213-217(1981).
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[2]
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NUCLEOTIDE SEQUENCE [GENOMIC RNA].
DOI=10.1098/rstb.2001.0979; PubMed=11779399 [NCBI, ExPASy, EBI, Israel, Japan]
Schickli J.H.,
Flandorfer A.,
Nakaya T.,
Martinez-Sobrido L.,
Garcia-Sastre A.,
Palese P.;
"Plasmid-only rescue of influenza A virus vaccine candidates.";
Philos. Trans. R. Soc. Lond., B, Biol. Sci. 356:1965-1973(2001).
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[3]
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NUCLEOTIDE SEQUENCE [GENOMIC RNA], AND REVERSE GENETICS.
DOI=10.1016/j.virusres.2004.02.028; PubMed=15163504 [NCBI, ExPASy, EBI, Israel, Japan]
de Wit E.,
Spronken M.I.J.,
Bestebroer T.M.,
Rimmelzwaan G.F.,
Osterhaus A.D.M.E.,
Fouchier R.A.M.;
"Efficient generation and growth of influenza virus A/PR/8/34 from eight cDNA fragments.";
Virus Res. 103:155-161(2004).
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[4]
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NUCLEOTIDE SEQUENCE [GENOMIC RNA].
Ghedin E.,
Spiro D.,
Miller N.,
Zaborsky J.,
Feldblyum T.,
Subbu V.,
Shumway M.,
Sparenborg J.,
Groveman L.,
Halpin R.,
Sitz J.,
Koo H.,
Salzberg S.L.,
Webster R.G.,
Hoffmann E.,
Krauss S.,
Naeve C.,
Bao Y.,
Bolotov P., ![]()
Dernovoy D.,
Kiryutin B.,
Lipman D.J.,
Tatusova T.;
"The NIAID influenza genome sequencing project.";
Submitted (MAR-2006) to the EMBL/GenBank/DDBJ databases.
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[5]
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NUCLEOTIDE SEQUENCE [GENOMIC RNA] OF 1-71.
DOI=10.1016/0042-6822(82)90162-3; PubMed=6927853 [NCBI, ExPASy, EBI, Israel, Japan]
Blok J.,
Air G.M.;
"Sequence variation at the 3' end of the neuraminidase gene from 39 influenza type A viruses.";
Virology 121:211-229(1982).
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[6]
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REVIEW.
DOI=10.1016/j.virusres.2004.08.012; PubMed=15567494 [NCBI, ExPASy, EBI, Israel, Japan]
Nayak D.P.,
Hui E.K.,
Barman S.;
"Assembly and budding of influenza virus.";
Virus Res. 106:147-165(2004).
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[7]
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REVIEW.
DOI=10.1056/NEJMra050740; PubMed=16192481 [NCBI, ExPASy, EBI, Israel, Japan]
Moscona A.;
"Neuraminidase inhibitors for influenza.";
N. Engl. J. Med. 353:1363-1373(2005).
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[8]
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REVIEW.
DOI=10.1248/bpb.28.399; PubMed=15744059 [NCBI, ExPASy, EBI, Israel, Japan]
Suzuki Y.;
"Sialobiology of influenza: molecular mechanism of host range variation of influenza viruses.";
Biol. Pharm. Bull. 28:399-408(2005).
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- FUNCTION: 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 ACTIVITY: 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.
- COFACTOR: Binds 1 calcium ion (By similarity).
- ENZYME REGULATION: 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.
- SUBUNIT: Homotetramer (By similarity).
- SUBCELLULAR LOCATION: Virion membrane (By similarity). Apical cell membrane; 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).
- DOMAIN: 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).
- PTM: N-glycosylated (By similarity).
- 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.
- SIMILARITY: Belongs to the glycosyl hydrolase 34 family [view classification].
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