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NRAM_I72A3
ID   NRAM_I72A3              Reviewed;         469 AA.
AC   P03475; Q463X2; Q75VQ3;
DT   21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT   06-MAR-2007, sequence version 2.
DT   03-AUG-2022, entry version 127.
DE   RecName: Full=Neuraminidase {ECO:0000255|HAMAP-Rule:MF_04071};
DE            EC=3.2.1.18 {ECO:0000255|HAMAP-Rule:MF_04071};
GN   Name=NA {ECO:0000255|HAMAP-Rule:MF_04071};
OS   Influenza A virus (strain A/Memphis/102/1972 H3N2).
OC   Viruses; Riboviria; Orthornavirae; Negarnaviricota; Polyploviricotina;
OC   Insthoviricetes; Articulavirales; Orthomyxoviridae; Alphainfluenzavirus.
OX   NCBI_TaxID=385640;
OH   NCBI_TaxID=8782; Aves.
OH   NCBI_TaxID=9721; Cetacea (whales).
OH   NCBI_TaxID=9606; Homo sapiens (Human).
OH   NCBI_TaxID=9709; Phocidae (true seals).
OH   NCBI_TaxID=9823; Sus scrofa (Pig).
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC RNA].
RX   PubMed=14741372; DOI=10.1016/s0014-5793(03)01503-5;
RA   Suzuki T., Takahashi T., Saito T., Guo C.T., Hidari K.I.-P.J., Miyamoto D.,
RA   Suzuki Y.;
RT   "Evolutional analysis of human influenza A virus N2 neuraminidase genes
RT   based on the transition of the low-pH stability of sialidase activity.";
RL   FEBS Lett. 557:228-232(2004).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [GENOMIC RNA].
RA   Ghedin E., Spiro D., Miller N., Zaborsky J., Feldblyum T., Subbu V.,
RA   Shumway M., Sparenborg J., Groveman L., Halpin R., Sitz J., Koo H.,
RA   Salzberg S.L., Webster R.G., Hoffmann E., Krauss S., Naeve C., Bao Y.,
RA   Bolotov P., Dernovoy D., Kiryutin B., Lipman D.J., Tatusova T.;
RT   "The NIAID influenza genome sequencing project.";
RL   Submitted (AUG-2005) to the EMBL/GenBank/DDBJ databases.
RN   [3]
RP   NUCLEOTIDE SEQUENCE [GENOMIC RNA] OF 1-91.
RX   PubMed=6896994; DOI=10.1021/bi00260a015;
RA   Blok J., Air G.M.;
RT   "Variation in the membrane-insertion and 'stalk' sequences in eight
RT   subtypes of influenza type A virus neuraminidase.";
RL   Biochemistry 21:4001-4007(1982).
RN   [4]
RP   REVIEW.
RX   PubMed=15567494; DOI=10.1016/j.virusres.2004.08.012;
RA   Nayak D.P., Hui E.K., Barman S.;
RT   "Assembly and budding of influenza virus.";
RL   Virus Res. 106:147-165(2004).
RN   [5]
RP   REVIEW.
RX   PubMed=16192481; DOI=10.1056/nejmra050740;
RA   Moscona A.;
RT   "Neuraminidase inhibitors for influenza.";
RL   N. Engl. J. Med. 353:1363-1373(2005).
RN   [6]
RP   REVIEW.
RX   PubMed=15744059; DOI=10.1248/bpb.28.399;
RA   Suzuki Y.;
RT   "Sialobiology of influenza: molecular mechanism of host range variation of
RT   influenza viruses.";
RL   Biol. Pharm. Bull. 28:399-408(2005).
CC   -!- FUNCTION: Catalyzes the removal of terminal sialic acid residues from
CC       viral and cellular glycoconjugates. Cleaves off the terminal sialic
CC       acids on the glycosylated HA during virus budding to facilitate virus
CC       release. Additionally helps virus spread through the circulation by
CC       further removing sialic acids from the cell surface. These cleavages
CC       prevent self-aggregation and ensure the efficient spread of the progeny
CC       virus from cell to cell. Otherwise, infection would be limited to one
CC       round of replication. Described as a receptor-destroying enzyme because
CC       it cleaves a terminal sialic acid from the cellular receptors. May
CC       facilitate viral invasion of the upper airways by cleaving the sialic
CC       acid moieties on the mucin of the airway epithelial cells. Likely to
CC       plays a role in the budding process through its association with lipid
CC       rafts during intracellular transport. May additionally display a raft-
CC       association independent effect on budding. Plays a role in the
CC       determination of host range restriction on replication and virulence.
CC       Sialidase activity in late endosome/lysosome traffic seems to enhance
CC       virus replication. {ECO:0000255|HAMAP-Rule:MF_04071}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=Hydrolysis of alpha-(2->3)-, alpha-(2->6)-, alpha-
CC         (2->8)- glycosidic linkages of terminal sialic acid residues in
CC         oligosaccharides, glycoproteins, glycolipids, colominic acid and
CC         synthetic substrates.; EC=3.2.1.18; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_04071};
CC   -!- COFACTOR:
CC       Name=Ca(2+); Xref=ChEBI:CHEBI:29108;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_04071};
CC   -!- ACTIVITY REGULATION: Inhibited by the neuraminidase inhibitors
CC       zanamivir (Relenza) and oseltamivir (Tamiflu). These drugs interfere
CC       with the release of progeny virus from infected cells and are effective
CC       against all influenza strains. Resistance to neuraminidase inhibitors
CC       is quite rare. {ECO:0000255|HAMAP-Rule:MF_04071}.
CC   -!- SUBUNIT: Homotetramer. {ECO:0000255|HAMAP-Rule:MF_04071}.
CC   -!- SUBCELLULAR LOCATION: Virion membrane {ECO:0000255|HAMAP-
CC       Rule:MF_04071}. Host apical cell membrane {ECO:0000255|HAMAP-
CC       Rule:MF_04071}; Single-pass type II membrane protein
CC       {ECO:0000255|HAMAP-Rule:MF_04071}. Note=Preferentially accumulates at
CC       the apical plasma membrane in infected polarized epithelial cells,
CC       which is the virus assembly site. Uses lipid rafts for cell surface
CC       transport and apical sorting. In the virion, forms a mushroom-shaped
CC       spike on the surface of the membrane. {ECO:0000255|HAMAP-
CC       Rule:MF_04071}.
CC   -!- DOMAIN: Intact N-terminus is essential for virion morphogenesis.
CC       Possesses two apical sorting signals, one in the ectodomain, which is
CC       likely to be a glycan, and the other in the transmembrane domain. The
CC       transmembrane domain also plays a role in lipid raft association.
CC       {ECO:0000255|HAMAP-Rule:MF_04071}.
CC   -!- PTM: N-glycosylated. {ECO:0000255|HAMAP-Rule:MF_04071}.
CC   -!- MISCELLANEOUS: The influenza A genome consist of 8 RNA segments.
CC       Genetic variation of hemagglutinin and/or neuraminidase genes results
CC       in the emergence of new influenza strains. The mechanism of variation
CC       can be the result of point mutations or the result of genetic
CC       reassortment between segments of two different strains.
CC   -!- SIMILARITY: Belongs to the glycosyl hydrolase 34 family.
CC       {ECO:0000255|HAMAP-Rule:MF_04071}.
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DR   EMBL; AB124659; BAD16643.1; -; Genomic_RNA.
DR   EMBL; CY002098; AAZ43386.1; -; Genomic_RNA.
DR   EMBL; V01091; CAA24275.1; -; Unassigned_RNA.
DR   SMR; P03475; -.
DR   CAZy; GH34; Glycoside Hydrolase Family 34.
DR   PRO; PR:P03475; -.
DR   Proteomes; UP000118421; Genome.
DR   GO; GO:0020002; C:host cell plasma membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-UniRule.
DR   GO; GO:0055036; C:virion membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0052794; F:exo-alpha-(2->3)-sialidase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0052795; F:exo-alpha-(2->6)-sialidase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0052796; F:exo-alpha-(2->8)-sialidase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0005975; P:carbohydrate metabolic process; IEA:InterPro.
DR   GO; GO:0046761; P:viral budding from plasma membrane; IEA:UniProtKB-UniRule.
DR   CDD; cd15483; Influenza_NA; 1.
DR   HAMAP; MF_04071; INFV_NRAM; 1.
DR   InterPro; IPR001860; Glyco_hydro_34.
DR   InterPro; IPR033654; Sialidase_Influenza_A/B.
DR   InterPro; IPR036278; Sialidase_sf.
DR   Pfam; PF00064; Neur; 1.
DR   SUPFAM; SSF50939; SSF50939; 1.
PE   3: Inferred from homology;
KW   Calcium; Disulfide bond; Glycoprotein; Glycosidase; Host cell membrane;
KW   Host membrane; Hydrolase; Membrane; Metal-binding; Signal-anchor;
KW   Transmembrane; Transmembrane helix; Virion.
FT   CHAIN           1..469
FT                   /note="Neuraminidase"
FT                   /id="PRO_0000078708"
FT   TOPO_DOM        1..9
FT                   /note="Intravirion"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   TRANSMEM        10..30
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   TOPO_DOM        31..469
FT                   /note="Virion surface"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   REGION          11..33
FT                   /note="Involved in apical transport and lipid raft
FT                   association"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   REGION          36..88
FT                   /note="Hypervariable stalk region"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   REGION          91..469
FT                   /note="Head of neuraminidase"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   ACT_SITE        151
FT                   /note="Proton donor/acceptor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   ACT_SITE        406
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   BINDING         118
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   BINDING         152
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   BINDING         276..277
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   BINDING         292
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   BINDING         293
FT                   /ligand="Ca(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29108"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   BINDING         297
FT                   /ligand="Ca(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29108"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   BINDING         324
FT                   /ligand="Ca(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29108"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   BINDING         371
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   CARBOHYD        61
FT                   /note="N-linked (GlcNAc...) asparagine; by host"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   CARBOHYD        70
FT                   /note="N-linked (GlcNAc...) asparagine; by host"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   CARBOHYD        86
FT                   /note="N-linked (GlcNAc...) asparagine; by host"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   CARBOHYD        146
FT                   /note="N-linked (GlcNAc...) asparagine; by host"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   CARBOHYD        200
FT                   /note="N-linked (GlcNAc...) asparagine; by host"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   CARBOHYD        234
FT                   /note="N-linked (GlcNAc...) asparagine; by host"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   CARBOHYD        402
FT                   /note="N-linked (GlcNAc...) asparagine; by host"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   DISULFID        92..417
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   DISULFID        124..129
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   DISULFID        183..230
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   DISULFID        232..237
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   DISULFID        278..291
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   DISULFID        280..289
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   DISULFID        318..337
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   DISULFID        421..447
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT   CONFLICT        28
FT                   /note="I -> M (in Ref. 3; CAA24275)"
FT   CONFLICT        46
FT                   /note="A -> G (in Ref. 3; CAA24275)"
FT   CONFLICT        51..52
FT                   /note="MP -> TL (in Ref. 3; CAA24275)"
FT   CONFLICT        67
FT                   /note="Y -> H (in Ref. 3; CAA24275)"
FT   CONFLICT        383..384
FT                   /note="WS -> LF (in Ref. 1; BAD16643)"
SQ   SEQUENCE   469 AA;  52146 MW;  005D07E579580B27 CRC64;
     MNPNQKIITI GSVSLTIATI CFLMQIAILV TTVTLHFKQY ECDSPANNQV MPCEPIIIER
     NITEIVYLTN TTIEKEICPK LVEYRNWSKP QCKITGFAPF SKDNSIRLSA GGDIWVTREP
     YVSCDPGKCY QFALGQGTTL DNKHSNDTIH DRTPHRTLLM NELGVPFHLG TRQVCIAWSS
     SSCHDGKAWL HVCVTGYDKN ATASFIYDGR LVDSIGSWSQ NILRTQESEC VCINGTCTVV
     MTDGSASGRA DTKILFIEEG KIVHISPLSG SAQHVEECSC YPRYPGVRCI CRDNWKGSNR
     PVVDINVKDY SIDSSYVCSG LVGDTPRNND RSSNSYCRNP NNEKGNHGVK GWAFDDGNDV
     WMGRTISEDS RSGYETFKVI GGWSTPNSKL QINRQVIVDS DNRSGYSGIF SVEGKSCINR
     CFYVELIRGR EQETRVWWTS NSIVVFCGTS GTYGTGSWPD GADINLMPI
 
 
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