NRAM_I81A2
ID NRAM_I81A2 Reviewed; 470 AA.
AC P08326;
DT 01-AUG-1988, integrated into UniProtKB/Swiss-Prot.
DT 01-AUG-1988, sequence version 1.
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/Equine/Kentucky/1/1981).
OC Viruses; Riboviria; Orthornavirae; Negarnaviricota; Polyploviricotina;
OC Insthoviricetes; Articulavirales; Orthomyxoviridae; Alphainfluenzavirus.
OX NCBI_TaxID=475467;
OH NCBI_TaxID=8782; Aves.
OH NCBI_TaxID=9796; Equus caballus (Horse).
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC RNA].
RX PubMed=3788060; DOI=10.1016/0042-6822(86)90207-2;
RA Dale B., Brown R., Miller J., White R.T., Air G.M., Cordell B.;
RT "Nucleotide and deduced amino acid sequence of the influenza neuraminidase
RT genes of two equine serotypes.";
RL Virology 155:460-468(1986).
RN [2]
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 [3]
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 [4]
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; M14917; AAA43245.1; -; Genomic_RNA.
DR SMR; P08326; -.
DR CAZy; GH34; Glycoside Hydrolase Family 34.
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 HAMAP; MF_04071; INFV_NRAM; 1.
DR InterPro; IPR001860; Glyco_hydro_34.
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..470
FT /note="Neuraminidase"
FT /id="PRO_0000078697"
FT TOPO_DOM 1..14
FT /note="Intravirion"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT TRANSMEM 15..35
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT TOPO_DOM 36..470
FT /note="Virion surface"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT REGION 11..32
FT /note="Involved in apical transport and lipid raft
FT association"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT REGION 32..86
FT /note="Hypervariable stalk region"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT REGION 89..470
FT /note="Head of neuraminidase"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT ACT_SITE 149
FT /note="Proton donor/acceptor"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT ACT_SITE 402
FT /note="Nucleophile"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 116
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 150
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 275..276
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 291
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 292
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 296
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 322
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 368
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT CARBOHYD 39
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT CARBOHYD 46
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT CARBOHYD 54
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT CARBOHYD 84
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT CARBOHYD 144
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT CARBOHYD 293
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT CARBOHYD 398
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 90..417
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 122..127
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 182..229
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 231..236
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 277..290
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 279..288
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 316..335
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 421..446
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
SQ SEQUENCE 470 AA; 52171 MW; E71AAB9C31538A7A CRC64;
MNPNQKIIAI GSASLGILIL NVILHVVSII VTVLVLNNNG TGLNCNGTII REYNETVRVE
RITQWYNTNT IEYIERPSNE YYMNNTEPLC EAQGFAPFSK DNGIRIGSRG HVFVIREPFV
SCSPLECRTF FLTQGSLLND KHSNGTVKDR SPYRTLMSVK VGQSPNVYQA RFESVAWSAT
ACHDGKKWMT VGVTGPDNQA VAVVNYGGVP VDIINSWGRD ILRTQESSCT CIKGDCYWVM
TDGPANRQAK YRIFKAKDGR IIGQTDISFN GGHIEECSCY PNEGKVECVC RDNWTGTNRP
ILVISPDLSY TVGYLCAGIP TDTPRGEDSQ FTGSCTSPLG NKGYGVKGFG FRQGNDVWAG
RTISRTSRSG FEIIKIRNGW TQNSKDQIRK QVIIDNLNWS GYSGSFTLPV ELTKKGCLVP
CFWVEMIRGK PEDTTIWTSS SSIVMCGVDH KIASWSWHDG AILPFDIDKI
