ID Q910H2_9INFA Unreviewed; 252 AA. AC Q910H2; DT 01-DEC-2001, integrated into UniProtKB/TrEMBL. DT 01-DEC-2001, sequence version 1. DT 08-MAY-2019, entry version 85. DE RecName: Full=Matrix protein 1 {ECO:0000256|HAMAP-Rule:MF_04068, ECO:0000256|RuleBase:RU362105, ECO:0000256|SAAS:SAAS00051333}; DE Short=M1 {ECO:0000256|HAMAP-Rule:MF_04068, ECO:0000256|RuleBase:RU362105}; GN Name=M {ECO:0000256|HAMAP-Rule:MF_04068, GN ECO:0000256|RuleBase:RU362105, ECO:0000313|EMBL:AAK49251.1}; OS Influenza A virus (A/HongKong/97/98(H5N1)). OC Viruses; ssRNA viruses; ssRNA negative-strand viruses; OC Negarnaviricota; Polyploviricotina; Insthoviricetes; Articulavirales; OC Orthomyxoviridae; Alphainfluenzavirus. OX NCBI_TaxID=88097 {ECO:0000313|EMBL:AAK49251.1}; RN [1] {ECO:0000313|EMBL:AAK49251.1} RP NUCLEOTIDE SEQUENCE. RC STRAIN=A/Hong Kong/97/98 {ECO:0000313|EMBL:AAK49251.1}; RA Shaw M.W., Cooper L.A., Xu X., Thompson W.W., Krauss S.L., Guan Y., RA Zhou N.N., Klimov A., Cox N.J., Webster R.G., Lim W., Shortridge K.F., RA Subbarao K.; RL Submitted (APR-2000) to the EMBL/GenBank/DDBJ databases. RN [2] {ECO:0000313|EMBL:AAK49251.1} RP NUCLEOTIDE SEQUENCE. RC STRAIN=A/Hong Kong/97/98 {ECO:0000313|EMBL:AAK49251.1}; RX PubMed=11748666; DOI=10.1002/jmv.2118; RA Shaw M., Cooper L., Xu X., Thompson W., Krauss S., Guan Y., Zhou N., RA Klimov A., Cox N., Webster R., Lim W., Shortridge K., Subbarao K.; RT "Molecular changes associated with the transmission of avian influenza RT a H5N1 and H9N2 viruses to humans."; RL J. Med. Virol. 66:107-114(2002). RN [3] {ECO:0000313|EMBL:AAK49251.1} RP NUCLEOTIDE SEQUENCE. RC STRAIN=A/Hong Kong/97/98 {ECO:0000313|EMBL:AAK49251.1}; RX PubMed=16318689; RG World Health Organization Global Influenza Program Surveillance Network; RT "Evolution of H5N1 avian influenza viruses in Asia."; RL Emerg. Infect. Dis. 11:1515-1521(2005). CC -!- FUNCTION: Determines the virion's shape: spherical or filamentous. CC Clinical isolates of influenza are characterized by the presence CC of significant proportion of filamentous virions, whereas after CC multiple passage on eggs or cell culture, virions have only CC spherical morphology. Filamentous virions are thought to be CC important to infect neighboring cells, and spherical virions more CC suited to spread through aerosol between hosts organisms. CC {ECO:0000256|HAMAP-Rule:MF_04068, ECO:0000256|RuleBase:RU362105, CC ECO:0000256|SAAS:SAAS00043117}. CC -!- FUNCTION: Plays critical roles in virus replication, from virus CC entry and uncoating to assembly and budding of the virus particle. CC M1 binding to ribonucleocapsids (RNPs) in nucleus seems to inhibit CC viral transcription. Interaction of viral NEP with M1-RNP is CC thought to promote nuclear export of the complex, which is CC targeted to the virion assembly site at the apical plasma membrane CC in polarized epithelial cells. Interactions with NA and HA may CC bring M1, a non-raft-associated protein, into lipid rafts. Forms a CC continuous shell on the inner side of the lipid bilayer in virion, CC where it binds the RNP. During virus entry into cell, the M2 ion CC channel acidifies the internal virion core, inducing M1 CC dissociation from the RNP. M1-free RNPs are transported to the CC nucleus, where viral transcription and replication can take place. CC {ECO:0000256|HAMAP-Rule:MF_04068, ECO:0000256|RuleBase:RU362105, CC ECO:0000256|SAAS:SAAS00043108}. CC -!- SUBUNIT: Homodimer and homomultimer. Interacts with NEP. Binds CC ribonucleocapsid by both interacting with genomic RNA and NP CC protein. May interact with HA and NA. Cannot bind NP without CC genomic RNA. {ECO:0000256|HAMAP-Rule:MF_04068, CC ECO:0000256|RuleBase:RU362105, ECO:0000256|SAAS:SAAS00841835}. CC -!- SUBCELLULAR LOCATION: Host nucleus {ECO:0000256|HAMAP- CC Rule:MF_04068, ECO:0000256|RuleBase:RU362105, CC ECO:0000256|SAAS:SAAS00552517}. Virion membrane CC {ECO:0000256|HAMAP-Rule:MF_04068, ECO:0000256|RuleBase:RU362105}; CC Peripheral membrane protein {ECO:0000256|HAMAP-Rule:MF_04068, CC ECO:0000256|RuleBase:RU362105}; Cytoplasmic side CC {ECO:0000256|HAMAP-Rule:MF_04068, ECO:0000256|RuleBase:RU362105}. CC -!- MISCELLANEOUS: Most abundant protein in virion. When expressed CC alone can form virus-like particles in transfected cells. CC {ECO:0000256|HAMAP-Rule:MF_04068, ECO:0000256|RuleBase:RU362105}. CC -!- SIMILARITY: Belongs to the influenza viruses Matrix protein M1 CC family. {ECO:0000256|HAMAP-Rule:MF_04068, CC ECO:0000256|RuleBase:RU362105, ECO:0000256|SAAS:SAAS00841834}. 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; AF255374; AAK49251.1; -; Viral_cRNA. DR GO; GO:0042025; C:host cell nucleus; IEA:UniProtKB-SubCell. DR GO; GO:0055036; C:virion membrane; IEA:UniProtKB-SubCell. DR GO; GO:0003723; F:RNA binding; IEA:UniProtKB-UniRule. DR GO; GO:0039660; F:structural constituent of virion; IEA:UniProtKB-UniRule. DR GO; GO:0046761; P:viral budding from plasma membrane; IEA:UniProtKB-UniRule. DR Gene3D; 1.10.10.180; -; 1. DR Gene3D; 1.20.91.10; -; 1. DR HAMAP; MF_04068; INFV_M1; 1. DR InterPro; IPR036039; Flu_matrix_M1. DR InterPro; IPR013188; Flu_matrix_M1_C. DR InterPro; IPR001561; Flu_matrix_M1_N. DR InterPro; IPR015423; Flu_matrix_M1_N_sub1. DR InterPro; IPR015799; Flu_matrix_M1_N_sub2. DR InterPro; IPR037533; INFV_M1. DR Pfam; PF00598; Flu_M1; 1. DR Pfam; PF08289; Flu_M1_C; 1. DR ProDom; PD596253; Flu_matrix_M1_C; 1. DR ProDom; PD001061; Flu_matrix_M1_N; 1. DR SMART; SM00759; Flu_M1_C; 1. DR SUPFAM; SSF48145; SSF48145; 1. PE 3: Inferred from homology; KW Host nucleus {ECO:0000256|HAMAP-Rule:MF_04068, KW ECO:0000256|RuleBase:RU362105, ECO:0000256|SAAS:SAAS00043121}; KW Membrane {ECO:0000256|HAMAP-Rule:MF_04068, KW ECO:0000256|RuleBase:RU362105, ECO:0000256|SAAS:SAAS00043330}; KW RNA-binding {ECO:0000256|HAMAP-Rule:MF_04068, KW ECO:0000256|RuleBase:RU362105, ECO:0000256|SAAS:SAAS00051402}; KW Viral matrix protein {ECO:0000256|HAMAP-Rule:MF_04068, KW ECO:0000256|RuleBase:RU362105, ECO:0000256|SAAS:SAAS00438110}; KW Virion {ECO:0000256|HAMAP-Rule:MF_04068, KW ECO:0000256|RuleBase:RU362105, ECO:0000256|SAAS:SAAS00438277}. FT DOMAIN 158 252 Flu_M1_C. {ECO:0000259|SMART:SM00759}. FT REGION 1 164 Membrane-binding. {ECO:0000256|HAMAP- FT Rule:MF_04068}. FT REGION 165 252 RNP-binding. {ECO:0000256|HAMAP-Rule: FT MF_04068}. FT MOTIF 101 105 Nuclear localization signal. FT {ECO:0000256|HAMAP-Rule:MF_04068}. SQ SEQUENCE 252 AA; 27821 MW; C2E7A890688CDFEE CRC64; MSLLTEVETY VLSIVPSGPL KAQIAQRLED VFAGKNTDLE ALMEWLKTRP ILSPLTKGIL GFVFTLTVPS ERGLQRRRFV QNALNGNGDP NNMDRAVKLY KKLKREMTFH GAKEVALSYS TGALASCMGL IYNRMGTVTT EVALGLVCAT CEQIADAQHR SHRQMATTTN PLIRHENRMV LASTTAKAME QMAGSSEQAA EAMEVASQAR QMVQAMRTIG THPSSSAGLK DDLIENLQAY QKRMGVQMQR FK //