NRAM_I34A0
ID NRAM_I34A0 Reviewed; 447 AA.
AC Q64968;
DT 06-MAR-2007, integrated into UniProtKB/Swiss-Prot.
DT 01-NOV-1996, sequence version 1.
DT 03-AUG-2022, entry version 109.
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/Fowl plague virus/Rostock/8/1934 H7N1).
OC Viruses; Riboviria; Orthornavirae; Negarnaviricota; Polyploviricotina;
OC Insthoviricetes; Articulavirales; Orthomyxoviridae; Alphainfluenzavirus.
OX NCBI_TaxID=392810;
OH NCBI_TaxID=8782; Aves.
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC RNA].
RA Williamson R., McCauley J.W., Inglis S.C.;
RT "Influenza A virus neuraminidase sequence.";
RL Submitted (AUG-1990) to the EMBL/GenBank/DDBJ databases.
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; X52226; CAA36475.1; -; Genomic_RNA.
DR PIR; S20711; S20711.
DR SMR; Q64968; -.
DR CAZy; GH34; Glycoside Hydrolase Family 34.
DR SABIO-RK; Q64968; -.
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..447
FT /note="Neuraminidase"
FT /id="PRO_0000280131"
FT TOPO_DOM 1..6
FT /note="Intravirion"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT TRANSMEM 7..27
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT TOPO_DOM 28..447
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..68
FT /note="Hypervariable stalk region"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT REGION 69..447
FT /note="Head of neuraminidase"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT ACT_SITE 129
FT /note="Proton donor/acceptor"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT ACT_SITE 380
FT /note="Nucleophile"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 96
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 130
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 255..256
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 271
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 272
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 276
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 302
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 346
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT CARBOHYD 66
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT CARBOHYD 124
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT CARBOHYD 213
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 70..395
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 102..107
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 162..209
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 211..216
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 257..270
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 259..268
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 296..313
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 399..424
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
SQ SEQUENCE 447 AA; 48679 MW; 72AAFFE8BB7B5C49 CRC64;
MNPNQKIITI GSICMGIGII SLILQIGNII SMWVSHSIQT ENQNHHEACN PSIAGQDAAS
VALAGNSSLC PISGWAIYSK DNGIRIGSKG DVFVIREPFI SCSHLECRTF FLTQGALLND
KHSNGTVKDR SPYRTLMSCP VGEAPSPYNS RFVSVAWSAS ACHDGMGWLT IGISGPDNGA
VAVLKYNGII TDTIKSWKNN ILRTQESECA CINGSCFTIM TDGPSNGQAS YKIFKIEKGK
VVKSSELNAP NYHYEECSCY PDAGEVMCVC RDNWHGSNRP WVSFNKNLDY QIGYICSGVF
GDNPRPNDGT GSCGPVSSNG AYGIKGFSFK YGNGVWIGRT KSTSSRSGFE MIWDPNGWTE
TDSSFSVKQD IVAITDWSGY SGSFVQHPEL TGLDCMRPCF WVELIRGRPN HNTIWTSGSS
ISFCGVNSDT VGWSWPDGAE LPFTIDK
