ID Q9IP55_9INFA Unreviewed; 450 AA. AC Q9IP55; D1LN60; DT 01-OCT-2000, integrated into UniProtKB/TrEMBL. DT 01-OCT-2000, sequence version 1. DT 10-APR-2019, entry version 100. DE RecName: Full=Neuraminidase {ECO:0000256|HAMAP-Rule:MF_04071, ECO:0000256|RuleBase:RU361252, ECO:0000256|SAAS:SAAS00114532}; DE EC=3.2.1.18 {ECO:0000256|HAMAP-Rule:MF_04071, ECO:0000256|RuleBase:RU361252, ECO:0000256|SAAS:SAAS00114514}; GN Name=NA {ECO:0000256|HAMAP-Rule:MF_04071, GN ECO:0000256|RuleBase:RU361252, ECO:0000313|EMBL:ACZ45122.1}; OS Influenza A virus (A/Hong Kong/485/1997(H5N1)). OC Viruses; ssRNA viruses; ssRNA negative-strand viruses; OC Negarnaviricota; Polyploviricotina; Insthoviricetes; Articulavirales; OC Orthomyxoviridae; Alphainfluenzavirus. OX NCBI_TaxID=680692 {ECO:0000313|EMBL:AAF74324.1}; RN [1] {ECO:0000313|EMBL:AAF74324.1} RP NUCLEOTIDE SEQUENCE. RC STRAIN=A/Hong Kong/485/97 {ECO:0000313|EMBL:AAF74324.1}; RX PubMed=10769072; RA Hiromoto Y., Yamazaki Y., Fukushima T., Saito T., Lindstrom S.E., RA Omoe K., Nerome R., Lim W., Sugita S., Nerome K.; RT "Evolutionary characterization of the six internal genes of H5N1 human RT influenza A virus."; RL J. Gen. Virol. 81:1293-1303(2000). RN [2] {ECO:0000313|EMBL:ACZ45122.1, ECO:0000313|Proteomes:UP000120622} RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RC STRAIN=A/Hong Kong/485/1997 {ECO:0000313|EMBL:ACZ45122.1}; RA Kim L.M., Scott M.A., Suarez D.L., Spackman E., Swayne D.E., RA Afonso C.L.; RT "USDA Agriculture Research Service Avian Influenza Virus Sequencing RT Project."; RL Submitted (OCT-2009) to the EMBL/GenBank/DDBJ databases. CC -!- FUNCTION: Catalyzes the removal of terminal sialic acid residues CC from viral and cellular glycoconjugates. Cleaves off the terminal CC sialic acids on the glycosylated HA during virus budding to CC facilitate virus release. Additionally helps virus spread through CC the circulation by further removing sialic acids from the cell CC surface. These cleavages prevent self-aggregation and ensure the CC efficient spread of the progeny virus from cell to cell. CC Otherwise, infection would be limited to one round of replication. CC Described as a receptor-destroying enzyme because it cleaves a CC terminal sialic acid from the cellular receptors. May facilitate CC viral invasion of the upper airways by cleaving the sialic acid CC moities on the mucin of the airway epithelial cells. Likely to CC plays a role in the budding process through its association with CC lipid rafts during intracellular transport. May additionally CC display a raft-association independent effect on budding. Plays a CC role in the determination of host range restriction on replication CC and virulence. Sialidase activity in late endosome/lysosome CC traffic seems to enhance virus replication. {ECO:0000256|HAMAP- CC Rule:MF_04071, ECO:0000256|SAAS:SAAS00844152}. 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:0000256|HAMAP- CC Rule:MF_04071, ECO:0000256|RuleBase:RU361252, CC ECO:0000256|SAAS:SAAS01116071}; CC -!- COFACTOR: CC Name=Ca(2+); Xref=ChEBI:CHEBI:29108; Evidence={ECO:0000256|HAMAP- CC Rule:MF_04071, ECO:0000256|RuleBase:RU361252, CC ECO:0000256|SAAS:SAAS00612833}; CC -!- ACTIVITY REGULATION: Inhibited by the neuraminidase inhibitors CC zanamivir (Relenza) and oseltamivir (Tamiflu). These drugs CC interfere with the release of progeny virus from infected cells CC and are effective against all influenza strains. Resistance to CC neuraminidase inhibitors is quite rare. {ECO:0000256|HAMAP- CC Rule:MF_04071, ECO:0000256|SAAS:SAAS01070481}. CC -!- SUBUNIT: Homotetramer. {ECO:0000256|HAMAP-Rule:MF_04071, CC ECO:0000256|RuleBase:RU361252, ECO:0000256|SAAS:SAAS00114476}. CC -!- SUBCELLULAR LOCATION: Host apical cell membrane CC {ECO:0000256|HAMAP-Rule:MF_04071, ECO:0000256|SAAS:SAAS00582107}; CC Single-pass type II membrane protein {ECO:0000256|HAMAP- CC Rule:MF_04071, ECO:0000256|SAAS:SAAS00582107}. Virion membrane CC {ECO:0000256|HAMAP-Rule:MF_04071}. Note=Preferentially accumulates CC at the apical plasma membrane in infected polarized epithelial CC cells, which is the virus assembly site. Uses lipid rafts for cell CC surface transport and apical sorting. In the virion, forms a CC mushroom-shaped spike on the surface of the membrane. CC {ECO:0000256|HAMAP-Rule:MF_04071}. CC -!- DOMAIN: Intact N-terminus is essential for virion morphogenesis. CC Possess two apical sorting signals, one in the ectodomain, which CC is likely to be a glycan, and the other in the transmembrane CC domain. The transmembrane domain also plays a role in lipid raft CC association. {ECO:0000256|HAMAP-Rule:MF_04071}. CC -!- PTM: N-glycosylated. {ECO:0000256|HAMAP-Rule:MF_04071, CC ECO:0000256|RuleBase:RU361252}. CC -!- SIMILARITY: Belongs to the glycosyl hydrolase 34 family. CC {ECO:0000256|HAMAP-Rule:MF_04071, ECO:0000256|RuleBase:RU361252, CC ECO:0000256|SAAS:SAAS00582269}. CC -!- CAUTION: Lacks conserved residue(s) required for the propagation CC of feature annotation. {ECO:0000256|HAMAP-Rule:MF_04071}. CC --------------------------------------------------------------------------- CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms CC Distributed under the Creative Commons Attribution (CC BY 4.0) License CC --------------------------------------------------------------------------- DR EMBL; AF084274; AAF74324.1; -; Genomic_RNA. DR EMBL; GU052144; ACZ45122.1; -; Viral_cRNA. DR CAZy; GH34; Glycoside Hydrolase Family 34. DR Proteomes; UP000120622; 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:UniProtKB-UniRule. 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 {ECO:0000256|HAMAP-Rule:MF_04071, KW ECO:0000256|RuleBase:RU361252, ECO:0000256|SAAS:SAAS00114513}; KW Complete proteome {ECO:0000313|Proteomes:UP000120622}; KW Disulfide bond {ECO:0000256|HAMAP-Rule:MF_04071, KW ECO:0000256|SAAS:SAAS00114594}; KW Glycoprotein {ECO:0000256|HAMAP-Rule:MF_04071, KW ECO:0000256|RuleBase:RU361252}; KW Glycosidase {ECO:0000256|HAMAP-Rule:MF_04071, KW ECO:0000256|RuleBase:RU361252, ECO:0000256|SAAS:SAAS00114535}; KW Host cell membrane {ECO:0000256|HAMAP-Rule:MF_04071, KW ECO:0000256|RuleBase:RU361252, ECO:0000256|SAAS:SAAS00114522}; KW Host membrane {ECO:0000256|HAMAP-Rule:MF_04071, KW ECO:0000256|RuleBase:RU361252, ECO:0000256|SAAS:SAAS00114565}; KW Hydrolase {ECO:0000256|HAMAP-Rule:MF_04071, KW ECO:0000256|RuleBase:RU361252, ECO:0000256|SAAS:SAAS00114491}; KW Membrane {ECO:0000256|HAMAP-Rule:MF_04071, KW ECO:0000256|SAAS:SAAS00114461}; KW Metal-binding {ECO:0000256|HAMAP-Rule:MF_04071, KW ECO:0000256|RuleBase:RU361252, ECO:0000256|SAAS:SAAS00114385}; KW Signal-anchor {ECO:0000256|HAMAP-Rule:MF_04071}; KW Transmembrane {ECO:0000256|HAMAP-Rule:MF_04071, KW ECO:0000256|SAAS:SAAS00114524}; KW Transmembrane helix {ECO:0000256|HAMAP-Rule:MF_04071, KW ECO:0000256|SAAS:SAAS00114517}; KW Virion {ECO:0000256|HAMAP-Rule:MF_04071, KW ECO:0000256|RuleBase:RU361252, ECO:0000256|SAAS:SAAS00114362}. FT TRANSMEM 7 34 Helical. {ECO:0000256|HAMAP-Rule: FT MF_04071}. FT REGION 11 33 Involved in apical transport and lipid FT raft association. {ECO:0000256|HAMAP- FT Rule:MF_04071}. FT REGION 72 450 Head of neuraminidase. FT {ECO:0000256|HAMAP-Rule:MF_04071}. FT REGION 258 259 Substrate binding. {ECO:0000256|HAMAP- FT Rule:MF_04071}. FT ACT_SITE 132 132 Proton donor/acceptor. FT {ECO:0000256|HAMAP-Rule:MF_04071}. FT ACT_SITE 383 383 Nucleophile. {ECO:0000256|HAMAP-Rule: FT MF_04071}. FT METAL 275 275 Calcium; via carbonyl oxygen. FT {ECO:0000256|HAMAP-Rule:MF_04071}. FT METAL 279 279 Calcium; via carbonyl oxygen. FT {ECO:0000256|HAMAP-Rule:MF_04071}. FT METAL 305 305 Calcium. {ECO:0000256|HAMAP-Rule: FT MF_04071}. FT BINDING 99 99 Substrate. {ECO:0000256|HAMAP-Rule: FT MF_04071}. FT BINDING 133 133 Substrate. {ECO:0000256|HAMAP-Rule: FT MF_04071}. FT BINDING 274 274 Substrate. {ECO:0000256|HAMAP-Rule: FT MF_04071}. FT BINDING 349 349 Substrate. {ECO:0000256|HAMAP-Rule: FT MF_04071}. FT DISULFID 73 398 {ECO:0000256|HAMAP-Rule:MF_04071}. FT DISULFID 105 110 {ECO:0000256|HAMAP-Rule:MF_04071}. FT DISULFID 165 212 {ECO:0000256|HAMAP-Rule:MF_04071}. FT DISULFID 214 219 {ECO:0000256|HAMAP-Rule:MF_04071}. FT DISULFID 260 273 {ECO:0000256|HAMAP-Rule:MF_04071}. FT DISULFID 262 271 {ECO:0000256|HAMAP-Rule:MF_04071}. FT DISULFID 299 316 {ECO:0000256|HAMAP-Rule:MF_04071}. FT DISULFID 402 427 {ECO:0000256|HAMAP-Rule:MF_04071}. SQ SEQUENCE 450 AA; 49535 MW; E9CA5A0D59E7C8F3 CRC64; MNPNQKIITI GSICMVVGII SLMLQIGNII SVWVSHIIQT WHPNQPEPCN QSINFYTEQA AASVTLAGNS SLCPISGWAI YSKDNSIRIG SKGDVFVIRE PFISCSHLEC RTFFLTQGAL LNDKHSNGTV KDRSPYRTLM SCPVGEAPSP YNSRFESVAW SASACHDGIS WLTIGISGPD NGAVAVLKYN GIITDTIKSW RNNILRTQES ECACVNGSCF TVMTDGPSNE QASYKIFKIE KGRVVKSVEL NAPNYHYEEC SCYPDAGEIT CVCRDNWHGS NRPWVSFNQN LEYQIGYICS GVFGDSPRPN DGTGSCGPVS LNGAYGVKGF SFKYGNGVWI GRTKSTSSRS GFEMIWDPNG WTETDSSFSL KQDIIAITDW SGYSGSFIQH PELTGLNCMR PCFWVELIRG RPKEKTIWTS GSSVSFCGVN SDTMGWSWPD GAELPFTIDK //