HBSAG_HBVE1
ID HBSAG_HBVE1 Reviewed; 399 AA.
AC Q69603;
DT 26-FEB-2008, integrated into UniProtKB/Swiss-Prot.
DT 26-FEB-2008, sequence version 2.
DT 25-MAY-2022, entry version 79.
DE RecName: Full=Large envelope protein {ECO:0000255|HAMAP-Rule:MF_04075};
DE AltName: Full=L glycoprotein {ECO:0000255|HAMAP-Rule:MF_04075};
DE AltName: Full=L-HBsAg {ECO:0000255|HAMAP-Rule:MF_04075};
DE Short=LHB {ECO:0000255|HAMAP-Rule:MF_04075};
DE AltName: Full=Large S protein {ECO:0000255|HAMAP-Rule:MF_04075};
DE AltName: Full=Large surface protein {ECO:0000255|HAMAP-Rule:MF_04075};
DE AltName: Full=Major surface antigen {ECO:0000255|HAMAP-Rule:MF_04075};
GN Name=S {ECO:0000255|HAMAP-Rule:MF_04075};
OS Hepatitis B virus genotype E subtype ayw4 (isolate Kou) (HBV-E).
OC Viruses; Riboviria; Pararnavirae; Artverviricota; Revtraviricetes;
OC Blubervirales; Hepadnaviridae; Orthohepadnavirus;
OC hepatitis B virus genotype E.
OX NCBI_TaxID=489495;
OH NCBI_TaxID=9606; Homo sapiens (Human).
OH NCBI_TaxID=9598; Pan troglodytes (Chimpanzee).
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX PubMed=8291231; DOI=10.1006/viro.1994.1060;
RA Norder H., Courouce A.M., Magnius L.O.;
RT "Complete genomes, phylogenetic relatedness, and structural proteins of six
RT strains of the hepatitis B virus, four of which represent two new
RT genotypes.";
RL Virology 198:489-503(1994).
RN [2]
RP REVIEW.
RX PubMed=8957666; DOI=10.1159/000150471;
RA Bruss V., Gerhardt E., Vieluf K., Wunderlich G.;
RT "Functions of the large hepatitis B virus surface protein in viral particle
RT morphogenesis.";
RL Intervirology 39:23-31(1996).
RN [3]
RP REVIEW.
RX PubMed=9498079; DOI=10.1007/978-1-4615-5383-0_20;
RA Block T.M., Lu X., Mehta A., Park J., Blumberg B.S., Dwek R.;
RT "Role of glycan processing in hepatitis B virus envelope protein
RT trafficking.";
RL Adv. Exp. Med. Biol. 435:207-216(1998).
RN [4]
RP REVIEW.
RX PubMed=15567498; DOI=10.1016/j.virusres.2004.08.016;
RA Bruss V.;
RT "Envelopment of the hepatitis B virus nucleocapsid.";
RL Virus Res. 106:199-209(2004).
RN [5]
RP REVIEW.
RX PubMed=16863502; DOI=10.1111/j.1349-7006.2006.00235.x;
RA Wang H.C., Huang W., Lai M.D., Su I.J.;
RT "Hepatitis B virus pre-S mutants, endoplasmic reticulum stress and
RT hepatocarcinogenesis.";
RL Cancer Sci. 97:683-688(2006).
CC -!- FUNCTION: The large envelope protein exists in two topological
CC conformations, one which is termed 'external' or Le-HBsAg and the other
CC 'internal' or Li-HBsAg. In its external conformation the protein
CC attaches the virus to cell receptors and thereby initiating infection.
CC This interaction determines the species specificity and liver tropism.
CC This attachment induces virion internalization predominantly through
CC caveolin-mediated endocytosis. The large envelope protein also assures
CC fusion between virion membrane and endosomal membrane. In its internal
CC conformation the protein plays a role in virion morphogenesis and
CC mediates the contact with the nucleocapsid like a matrix protein.
CC {ECO:0000255|HAMAP-Rule:MF_04075}.
CC -!- FUNCTION: The middle envelope protein plays an important role in the
CC budding of the virion. It is involved in the induction of budding in a
CC nucleocapsid independent way. In this process the majority of envelope
CC proteins bud to form subviral lipoprotein particles of 22 nm of
CC diameter that do not contain a nucleocapsid. {ECO:0000255|HAMAP-
CC Rule:MF_04075}.
CC -!- SUBUNIT: [Isoform L]: In its internal form (Li-HBsAg), interacts with
CC the capsid protein and with the isoform S. Interacts with host
CC chaperone CANX. {ECO:0000250|UniProtKB:P03141}.
CC -!- SUBUNIT: [Isoform M]: Associates with host chaperone CANX through its
CC pre-S2 N glycan; this association may be essential for isoform M proper
CC secretion. {ECO:0000250|UniProtKB:P03141}.
CC -!- SUBUNIT: [Isoform S]: Interacts with isoform L. Interacts with the
CC antigens of satellite virus HDV (HDVAgs); this interaction is required
CC for encapsidation of HDV genomic RNA. {ECO:0000250|UniProtKB:P03141}.
CC -!- SUBCELLULAR LOCATION: Virion membrane {ECO:0000255|HAMAP-
CC Rule:MF_04075}.
CC -!- ALTERNATIVE PRODUCTS:
CC Event=Alternative splicing, Alternative initiation; Named isoforms=3;
CC Name=L; Synonyms=Large envelope protein, LHB, L-HBsAg;
CC IsoId=Q69603-1; Sequence=Displayed;
CC Name=M; Synonyms=Middle envelope protein, MHB, M-HBsAg;
CC IsoId=Q69603-2; Sequence=VSP_031414;
CC Name=S; Synonyms=Small envelope protein, SHB, S-HBsAg;
CC IsoId=Q69603-3; Sequence=VSP_031413;
CC -!- DOMAIN: The large envelope protein is synthesized with the pre-S region
CC at the cytosolic side of the endoplasmic reticulum and, hence will be
CC within the virion after budding. Therefore the pre-S region is not N-
CC glycosylated. Later a post-translational translocation of N-terminal
CC pre-S and TM1 domains occur in about 50% of proteins at the virion
CC surface. These molecules change their topology by an unknown mechanism,
CC resulting in exposure of pre-S region at virion surface. For isoform M
CC in contrast, the pre-S2 region is translocated cotranslationally to the
CC endoplasmic reticulum lumen and is N-glycosylated. {ECO:0000255|HAMAP-
CC Rule:MF_04075}.
CC -!- PTM: Isoform M is N-terminally acetylated by host at a ratio of 90%,
CC and N-glycosylated by host at the pre-S2 region.
CC {ECO:0000250|UniProtKB:P03138, ECO:0000255|HAMAP-Rule:MF_04075}.
CC -!- PTM: Myristoylated. {ECO:0000255|HAMAP-Rule:MF_04075}.
CC -!- BIOTECHNOLOGY: Systematic vaccination of individuals at risk of
CC exposure to the virus has been the main method of controlling the
CC morbidity and mortality associated with hepatitis B. The first
CC hepatitis B vaccine was manufactured by the purification and
CC inactivation of HBsAg obtained from the plasma of chronic hepatitis B
CC virus carriers. The vaccine is now produced by recombinant DNA
CC techniques and expression of the S isoform in yeast cells. The pre-S
CC region do not seem to induce strong enough antigenic response.
CC -!- SIMILARITY: Belongs to the orthohepadnavirus major surface antigen
CC family. {ECO:0000255|HAMAP-Rule:MF_04075}.
CC -!- SEQUENCE CAUTION:
CC Sequence=CAA53355.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR EMBL; X75664; CAA53355.1; ALT_INIT; Genomic_DNA.
DR PIR; JQ1578; JQ1578.
DR PIR; JQ2079; JQ2079.
DR PIR; JQ2087; JQ2087.
DR PIR; JQ2088; JQ2088.
DR PIR; JQ2089; JQ2089.
DR PIR; JQ2091; JQ2091.
DR PIR; JQ2092; JQ2092.
DR Proteomes; UP000008538; Genome.
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:0075513; P:caveolin-mediated endocytosis of virus by host cell; IEA:UniProtKB-KW.
DR GO; GO:0039654; P:fusion of virus membrane with host endosome membrane; IEA:UniProtKB-KW.
DR GO; GO:0019062; P:virion attachment to host cell; IEA:UniProtKB-UniRule.
DR HAMAP; MF_04075; HBV_HBSAG; 1.
DR InterPro; IPR000349; HBV_HBSAG.
DR Pfam; PF00695; vMSA; 1.
PE 1: Evidence at protein level;
KW Acetylation; Alternative initiation; Alternative splicing;
KW Caveolin-mediated endocytosis of virus by host;
KW Fusion of virus membrane with host endosomal membrane;
KW Fusion of virus membrane with host membrane; Glycoprotein;
KW Host-virus interaction; Lipoprotein; Membrane; Myristate; Transmembrane;
KW Transmembrane helix; Viral attachment to host cell;
KW Viral penetration into host cytoplasm; Virion; Virus endocytosis by host;
KW Virus entry into host cell.
FT INIT_MET 1
FT /note="Removed; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT CHAIN 2..399
FT /note="Large envelope protein"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT /id="PRO_0000319089"
FT TOPO_DOM 2..252
FT /note="Intravirion; in internal conformation"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT TOPO_DOM 2..180
FT /note="Virion surface; in external conformation"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT TRANSMEM 181..201
FT /note="Helical; Name=TM1; Note=In external conformation"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT TOPO_DOM 202..252
FT /note="Intravirion; in external conformation"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT TRANSMEM 253..273
FT /note="Helical; Name=TM2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT TOPO_DOM 274..347
FT /note="Virion surface"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT TRANSMEM 348..368
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT TOPO_DOM 369..374
FT /note="Intravirion"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT TRANSMEM 375..397
FT /note="Helical; Name=TM3"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT TOPO_DOM 398..399
FT /note="Virion surface"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT REGION 2..173
FT /note="Pre-S"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT REGION 2..118
FT /note="Pre-S1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT REGION 85..110
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT REGION 119..173
FT /note="Pre-S2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT COMPBIAS 92..107
FT /note="Polar residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT LIPID 2
FT /note="N-myristoyl glycine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT CARBOHYD 319
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04075"
FT VAR_SEQ 1..173
FT /note="Missing (in isoform S)"
FT /evidence="ECO:0000305"
FT /id="VSP_031413"
FT VAR_SEQ 1..118
FT /note="Missing (in isoform M)"
FT /evidence="ECO:0000305"
FT /id="VSP_031414"
FT MOD_RES Q69603-2:1
FT /note="N-acetylmethionine"
FT /evidence="ECO:0000305"
FT CARBOHYD Q69603-2:4
FT /note="N-linked (GlcNAc...) asparagine"
FT /evidence="ECO:0000305"
SQ SEQUENCE 399 AA; 43984 MW; 79B52A0B9A55DB73 CRC64;
MGLSWTVPLE WGKNISTTNP LGFFPDHQLD PAFRANTRNP DWDHNPNKDH WTEANKVGVG
AFGPGFTPPH GGLLGWSPQA QGMLKTLPAD PPPASTNRQS GRQPTPITPP LRDTHPQAMQ
WNSTTFHQAL QDPRVRGLYF PAGGSSSGTV NPVPTTASLI SSIFSRIGDP APNMESITSG
FLGPLLVLQA GFFLLTKILT IPQSLDSWWT SLNFLGGAPV CLGQNSQSPT SNHSPTSCPP
ICPGYRWMCL RRFIIFLFIL LLCLIFLLVL LDYQGMLPVC PLIPGSSTTS TGPCRTCMTL
AQGTSMFPSC CCSKPSDGNC TCIPIPSSWA FGKFLWEWAS ARFSWLSLLV PFVQWFAGLS
PTVWLSVIWM MWYWGPSLYD ILSPFIPLLP IFFCLWVYI
