M1_I000F
ID M1_I000F Reviewed; 252 AA.
AC P05775;
DT 01-NOV-1988, integrated into UniProtKB/Swiss-Prot.
DT 01-NOV-1988, sequence version 1.
DT 29-SEP-2021, entry version 109.
DE RecName: Full=Matrix protein 1 {ECO:0000255|HAMAP-Rule:MF_04068};
DE Short=M1 {ECO:0000255|HAMAP-Rule:MF_04068};
GN Name=M {ECO:0000255|HAMAP-Rule:MF_04068};
OS Influenza A virus (strain A/Chicken/Weybridge H7N7) (Influenza A virus
OS (strain A/FPV/Weybridge H7N7)).
OC Viruses; Riboviria; Orthornavirae; Negarnaviricota; Polyploviricotina;
OC Insthoviricetes; Articulavirales; Orthomyxoviridae; Alphainfluenzavirus.
OX NCBI_TaxID=11384;
OH NCBI_TaxID=8782; Aves.
OH NCBI_TaxID=9796; Equus caballus (Horse).
OH NCBI_TaxID=9606; Homo sapiens (Human).
OH NCBI_TaxID=9709; Phocidae (true seals).
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC RNA].
RX PubMed=3414185; DOI=10.1016/0168-1702(88)90021-4;
RA Markushin S., Ghiasi H., Sokolov N., Shilov A., Sinitsin B., Brown D.,
RA Klimov A., Nayak D.;
RT "Nucleotide sequence of RNA segment 7 and the predicted amino sequence of
RT M1 and M2 proteins of FPV/Weybridge (H7N7) and WSN (H1N1) influenza
RT viruses.";
RL Virus Res. 10:263-272(1988).
RN [2]
RP NUCLEOTIDE SEQUENCE [MRNA].
RX PubMed=3450279;
RA Karginov V.A., Blinov V.M., Safronov P.F., Mamaev L.V., Golovin S.Y.,
RA Netesov S.V., Samokhvalov E.I., Sharova N.K., Yuferov V.P., Urivaev L.V.,
RA Bukrinskaya A.G.;
RT "Comparative analysis of primary structure of M-genes in remantadine-
RT resistant and remantadine-sensitive strains of influenza virus
RT A/FPV/Weybridge (H7N7) strains.";
RL Bioorg. Khim. 13:1638-1643(1987).
CC -!- FUNCTION: Plays critical roles in virus replication, from virus entry
CC and uncoating to assembly and budding of the virus particle. M1 binding
CC to ribonucleocapsids (RNPs) in nucleus seems to inhibit viral
CC transcription. Interaction of viral NEP with M1-RNP is thought to
CC promote nuclear export of the complex, which is targeted to the virion
CC assembly site at the apical plasma membrane in polarized epithelial
CC cells. Interactions with NA and HA may bring M1, a non-raft-associated
CC protein, into lipid rafts. Forms a continuous shell on the inner side
CC of the lipid bilayer in virion, where it binds the RNP. During virus
CC entry into cell, the M2 ion channel acidifies the internal virion core,
CC inducing M1 dissociation from the RNP. M1-free RNPs are transported to
CC the nucleus, where viral transcription and replication can take place.
CC {ECO:0000255|HAMAP-Rule:MF_04068}.
CC -!- FUNCTION: Determines the virion's shape: spherical or filamentous.
CC Clinical isolates of influenza are characterized by the presence of
CC significant proportion of filamentous virions, whereas after multiple
CC passage on eggs or cell culture, virions have only spherical
CC morphology. Filamentous virions are thought to be important to infect
CC neighboring cells, and spherical virions more suited to spread through
CC aerosol between hosts organisms. {ECO:0000255|HAMAP-Rule:MF_04068}.
CC -!- SUBUNIT: Homodimer and homomultimer. Interacts with NEP. Binds
CC ribonucleocapsid by both interacting with genomic RNA and NP protein.
CC May interact with HA and NA. Cannot bind NP without genomic RNA.
CC {ECO:0000255|HAMAP-Rule:MF_04068}.
CC -!- SUBCELLULAR LOCATION: Virion membrane {ECO:0000255|HAMAP-
CC Rule:MF_04068}; Peripheral membrane protein {ECO:0000255|HAMAP-
CC Rule:MF_04068}; Cytoplasmic side {ECO:0000255|HAMAP-Rule:MF_04068}.
CC Host nucleus {ECO:0000255|HAMAP-Rule:MF_04068}.
CC -!- ALTERNATIVE PRODUCTS:
CC Event=Alternative splicing; Named isoforms=2;
CC Comment=Only the first 9 residues are shared by the 2 isoforms.;
CC Name=M1;
CC IsoId=P05775-1; Sequence=Displayed;
CC Name=M2;
CC IsoId=P05778-1; Sequence=External;
CC -!- MISCELLANEOUS: Most abundant protein in virion. When expressed alone
CC can form virus-like particles in transfected cells. {ECO:0000255|HAMAP-
CC Rule:MF_04068}.
CC -!- SIMILARITY: Belongs to the influenza viruses Matrix protein M1 family.
CC {ECO:0000255|HAMAP-Rule:MF_04068}.
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DR EMBL; M23917; AAA43251.1; -; Genomic_RNA.
DR EMBL; M38299; AAA43314.1; ALT_TERM; mRNA.
DR PIR; PN0083; PN0083.
DR SMR; P05775; -.
DR GO; GO:0042025; C:host cell nucleus; IEA:UniProtKB-SubCell.
DR GO; GO:0016020; C:membrane; IEA:UniProtKB-KW.
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 SMART; SM00759; Flu_M1_C; 1.
DR SUPFAM; SSF48145; SSF48145; 1.
PE 2: Evidence at transcript level;
KW Alternative splicing; Host nucleus; Membrane; RNA-binding;
KW Viral matrix protein; Virion.
FT CHAIN 1..252
FT /note="Matrix protein 1"
FT /id="PRO_0000078860"
FT REGION 1..164
FT /note="Membrane-binding"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04068"
FT REGION 165..252
FT /note="RNP-binding"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04068"
FT MOTIF 101..105
FT /note="Nuclear localization signal"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04068"
FT VARIANT 109
FT /note="F -> L (in remantadine-resistant)"
FT CONFLICT 28
FT /note="L -> I (in Ref. 2; AAA43314)"
FT CONFLICT 41
FT /note="V -> A (in Ref. 2; AAA43314)"
FT CONFLICT 53
FT /note="S -> A (in Ref. 2; AAA43314)"
FT CONFLICT 95
FT /note="K -> R (in Ref. 2; AAA43314)"
FT CONFLICT 101
FT /note="R -> K (in Ref. 2; AAA43314)"
FT CONFLICT 144
FT /note="F -> L (in Ref. 2; AAA43314)"
FT CONFLICT 158
FT /note="Q -> H (in Ref. 2; AAA43314)"
FT CONFLICT 181
FT /note="L -> M (in Ref. 2; AAA43314)"
FT CONFLICT 212..213
FT /note="MV -> IG (in Ref. 2; AAA43314)"
SQ SEQUENCE 252 AA; 27904 MW; 8B823F78A2E91573 CRC64;
MSLLTEVETY VLSIIPSGPL KAEIAQRLED VFAGKNTDLE VLMEWLKTRP ILSPLTKGVL
GFVFTLTVPS ERGLQRRRFV QNALNGNGDP NNMDKAVKLY RKLKREITFY GAKEVALSYS
TGALASCMGL IYNRMGTVTT EVAFGLVCAT CEQIADSQHR SHRQMVTTTN PLIRHENRMV
LASTTAKAME QMAGSSEQAA EAMEVASQAR QMVQAMRTVG THPSSSAGLK DDLLENLQAY
QKRMGVQLQR FK
