NSP4_ROTB2
ID NSP4_ROTB2 Reviewed; 213 AA.
AC A9Q1L1;
DT 14-APR-2009, integrated into UniProtKB/Swiss-Prot.
DT 05-FEB-2008, sequence version 1.
DT 03-AUG-2022, entry version 47.
DE RecName: Full=Non-structural glycoprotein 4 {ECO:0000255|HAMAP-Rule:MF_04091};
DE Short=NSP4 {ECO:0000255|HAMAP-Rule:MF_04091};
DE AltName: Full=NCVP5 {ECO:0000255|HAMAP-Rule:MF_04091};
DE AltName: Full=NS28 {ECO:0000255|HAMAP-Rule:MF_04091};
OS Rotavirus X (isolate RVX/Human/Bangladesh/NADRV-B219/2002/GXP[X]) (RV
OS ADRV-N) (Rotavirus (isolate novel adult diarrhea rotavirus-B219)).
OC Viruses; Riboviria; Orthornavirae; Duplornaviricota; Resentoviricetes;
OC Reovirales; Reoviridae; Sedoreovirinae; Rotavirus; unclassified Rotavirus.
OX NCBI_TaxID=348136;
OH NCBI_TaxID=9606; Homo sapiens (Human).
RN [1]
RP NUCLEOTIDE SEQUENCE [MRNA].
RX PubMed=18814255; DOI=10.1002/jmv.21286;
RA Nagashima S., Kobayashi N., Ishino M., Alam M.M., Ahmed M.U., Paul S.K.,
RA Ganesh B., Chawla-Sarkar M., Krishnan T., Naik T.N., Wang Y.-H.;
RT "Whole genomic characterization of a human rotavirus strain B219 belonging
RT to a novel group of the genus Rotavirus.";
RL J. Med. Virol. 80:2023-2033(2008).
CC -!- FUNCTION: Plays an essential role in the virus replication cycle by
CC acting as a viroporin. Creates a pore in the host reticulum endoplasmic
CC and as a consequence releases Ca(2+) in the cytoplasm of infected cell.
CC In turn, high levels of cytoplasmic calcium trigger membrane
CC trafficking and transport of viral ER-associated proteins to
CC viroplasms, sites of viral genome replication and immature particle
CC assembly. {ECO:0000255|HAMAP-Rule:MF_04091}.
CC -!- FUNCTION: The secreted form acts as an enterotoxin that causes
CC phospholipase C-dependent elevation of the intracellular calcium
CC concentration in host intestinal mucosa cells. Increased concentration
CC of intracellular calcium disrupts the cytoskeleton and the tight
CC junctions, raising the paracellular permeability. Potentiates chloride
CC ion secretion through a calcium ion-dependent signaling pathway,
CC inducing age-dependent diarrhea. To perform this enterotoxigenic role
CC in vivo, NSP4 is released from infected enterocytes in a soluble form
CC capable of diffusing within the intestinal lumen and interacting with
CC host plasma membrane receptors on neighboring epithelial cells such as
CC integrins ITGA1/ITGB1 and ITGA2/ITGB1. {ECO:0000255|HAMAP-
CC Rule:MF_04091}.
CC -!- SUBUNIT: Homotetramer. Interacts with the immature particle in the
CC viroplasm. Interacts with host CAV1, early and late in infection.
CC Interacts with host integrin ITGA1/ITGB1 heterodimer. Interacts with
CC host integrin ITGA2/ITGB1 heterodimer. Interaction with microtubules
CC blocks trafficking to the Golgi apparatus. {ECO:0000255|HAMAP-
CC Rule:MF_04091}.
CC -!- SUBCELLULAR LOCATION: Host rough endoplasmic reticulum membrane
CC {ECO:0000255|HAMAP-Rule:MF_04091}; Single-pass type III membrane
CC protein {ECO:0000255|HAMAP-Rule:MF_04091}. Host membrane, host caveola
CC {ECO:0000255|HAMAP-Rule:MF_04091}; Single-pass type III membrane
CC protein {ECO:0000255|HAMAP-Rule:MF_04091}. Secreted {ECO:0000255|HAMAP-
CC Rule:MF_04091}. Note=NSP4 localizes also in vesicular structures which
CC contain autophagosomal markers and associate with viroplasms in virus-
CC infected cells. Additionally, a soluble form of glycosylated NSP4 is
CC secreted despite retention of its transmembrane domain.
CC {ECO:0000255|HAMAP-Rule:MF_04091}.
CC -!- PTM: The N-glycosyl content is primarily Man(9)GlcNAc, with a small
CC amount of Man(8)GlcNAc. {ECO:0000255|HAMAP-Rule:MF_04091}.
CC -!- SIMILARITY: Belongs to the rotavirus NSP4 family. {ECO:0000255|HAMAP-
CC Rule:MF_04091}.
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DR EMBL; EF453359; ABR32126.1; -; mRNA.
DR SMR; A9Q1L1; -.
DR Proteomes; UP000174021; Genome.
DR GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR GO; GO:0044155; C:host caveola; IEA:UniProtKB-SubCell.
DR GO; GO:0044169; C:host cell rough endoplasmic reticulum membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-UniRule.
DR GO; GO:0044385; C:integral to membrane of host cell; IEA:UniProtKB-KW.
DR GO; GO:0005216; F:ion channel activity; IEA:UniProtKB-KW.
DR GO; GO:0090729; F:toxin activity; IEA:UniProtKB-UniRule.
DR GO; GO:0039520; P:induction by virus of host autophagy; IEA:UniProtKB-KW.
DR GO; GO:0039707; P:pore formation by virus in membrane of host cell; IEA:UniProtKB-KW.
DR GO; GO:0051259; P:protein complex oligomerization; IEA:UniProtKB-KW.
DR HAMAP; MF_04091; ROTA_NSP4; 1.
DR InterPro; IPR002107; Rotavirus_NSP4.
PE 2: Evidence at transcript level;
KW Activation of host autophagy by virus; Enterotoxin; Glycoprotein;
KW Host endoplasmic reticulum; Host membrane; Host-virus interaction;
KW Ion channel; Ion transport; Membrane; Reference proteome; Secreted;
KW Signal-anchor; Toxin; Transmembrane; Transmembrane helix; Transport;
KW Viral ion channel; Virulence.
FT CHAIN 1..213
FT /note="Non-structural glycoprotein 4"
FT /id="PRO_0000369865"
FT TOPO_DOM 1..51
FT /note="Lumenal"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04091"
FT TRANSMEM 52..74
FT /note="Helical; Signal-anchor for type III membrane
FT protein"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04091"
FT TOPO_DOM 75..213
FT /note="Cytoplasmic"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04091"
FT CARBOHYD 50
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00498"
SQ SEQUENCE 213 AA; 25265 MW; 262CC9CC256EABB6 CRC64;
MEGTSESPIL DEFEANSNDY DNEFISRFSQ NPLHAFSLFT NGNIQEYFMN NSLEKIIIHI
VLIIISLCGI KAQTSKIIYI VRLLFWKMYN VINNLVNKMI NREKIADRQI VDNRFREFEE
RFRILLLQHD ENIAKQDNIV QYNKLDNFAE SIKSEFNLKV AEMERRFQEL KWRCDMIANK
TMNTIVLTNT VDSTNKDEKI IFDEGSVVQY NRE
