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Database: UniProt
Entry: POLS_IBDVU
LinkDB: POLS_IBDVU
Original site: POLS_IBDVU 
ID   POLS_IBDVU              Reviewed;        1012 AA.
AC   Q82635;
DT   07-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1996, sequence version 1.
DT   02-DEC-2020, entry version 77.
DE   RecName: Full=Structural polyprotein;
DE            Short=PP;
DE   Contains:
DE     RecName: Full=Precursor of VP2;
DE              Short=Pre-VP2;
DE   Contains:
DE     RecName: Full=Capsid protein VP2;
DE   Contains:
DE     RecName: Full=Structural peptide 1;
DE              Short=p1;
DE     AltName: Full=pep46;
DE   Contains:
DE     RecName: Full=Structural peptide 2;
DE              Short=p2;
DE     AltName: Full=pep7a;
DE   Contains:
DE     RecName: Full=Structural peptide 3;
DE              Short=p3;
DE     AltName: Full=pep7b;
DE   Contains:
DE     RecName: Full=Structural peptide 4;
DE              Short=p4;
DE     AltName: Full=pep11;
DE   Contains:
DE     RecName: Full=Protease VP4;
DE              EC=3.4.21.-;
DE     AltName: Full=Non-structural protein VP4;
DE              Short=NS;
DE   Contains:
DE     RecName: Full=Capsid protein VP3;
OS   Avian infectious bursal disease virus (isolate Chicken/UK/UK661/1989)
OS   (IBDV) (Gumboro disease virus).
OC   Viruses; Riboviria; Orthornavirae; Birnaviridae; Avibirnavirus.
OX   NCBI_TaxID=644440;
OH   NCBI_TaxID=9031; Gallus gallus (Chicken).
OH   NCBI_TaxID=9103; Meleagris gallopavo (Wild turkey).
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC RNA].
RX   PubMed=8725117; DOI=10.1016/0168-1702(95)01253-2;
RA   Brown M.D., Skinner M.A.;
RT   "Coding sequences of both genome segments of a European 'very virulent'
RT   infectious bursal disease virus.";
RL   Virus Res. 40:1-15(1996).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [GENOMIC RNA].
RX   PubMed=7688411; DOI=10.1099/0022-1317-74-8-1563;
RA   Schnitzler D., Bernstein F., Muller H., Becht H.;
RT   "The genetic basis for the antigenicity of the VP2 protein of the
RT   infectious bursal disease virus.";
RL   J. Gen. Virol. 74:1563-1571(1993).
CC   -!- FUNCTION: Capsid protein VP2 self assembles to form an icosahedral
CC       capsid with a T=13 symmetry, about 70 nm in diameter, and consisting of
CC       260 VP2 trimers. The capsid encapsulates the genomic dsRNA. VP2 is also
CC       involved in attachment and entry into the host cell by interacting with
CC       host ITGA4/ITGB1 (By similarity). {ECO:0000250}.
CC   -!- FUNCTION: The precursor of VP2 plays an important role in capsid
CC       assembly. First, pre-VP2 and VP2 oligomers assemble to form a
CC       procapsid. Then, the pre-VP2 intermediates may be processed into VP2
CC       proteins by proteolytic cleavage mediated by VP4 to obtain the mature
CC       virion. The final capsid is composed of pentamers and hexamers but VP2
CC       has a natural tendency to assemble into all-pentameric structures.
CC       Therefore pre-VP2 may be required to allow formation of the hexameric
CC       structures (By similarity). {ECO:0000250}.
CC   -!- FUNCTION: Protease VP4 is a serine protease that cleaves the
CC       polyprotein into its final products. Pre-VP2 is first partially
CC       cleaved, and may be completely processed by VP4 upon capsid maturation.
CC       {ECO:0000255|PROSITE-ProRule:PRU00881}.
CC   -!- FUNCTION: Capsid protein VP3 plays a key role in virion assembly by
CC       providing a scaffold for the capsid made of VP2. May self-assemble to
CC       form a T=4-like icosahedral inner-capsid composed of at least 180
CC       trimers. Plays a role in genomic RNA packaging by recruiting VP1 into
CC       the capsid and interacting with the dsRNA genome segments to form a
CC       ribonucleoprotein complex. Additionally, the interaction of the VP3 C-
CC       terminal tail with VP1 removes the inherent structural blockade of the
CC       polymerase active site. Thus, VP3 can also function as a
CC       transcriptional activator (By similarity). {ECO:0000250}.
CC   -!- FUNCTION: Structural peptide 1 is a small peptide derived from pre-VP2
CC       C-terminus. It destabilizes and perforates cell membranes, suggesting a
CC       role during entry (By similarity). {ECO:0000250}.
CC   -!- FUNCTION: Structural peptide 2 is a small peptide derived from pre-VP2
CC       C-terminus. It is not essential for the virus viability, but viral
CC       growth is affected when missing (By similarity). {ECO:0000250}.
CC   -!- FUNCTION: Structural peptide 3 is a small peptide derived from pre-VP2
CC       C-terminus. It is not essential for the virus viability, but viral
CC       growth is affected when missing (By similarity). {ECO:0000250}.
CC   -!- SUBUNIT: Capsid protein VP2 is a homotrimer. A central divalent metal
CC       stabilizes the VP2 trimer, possibly calcium (By similarity). Capsid
CC       protein VP3 is a homodimer. Capsid protein VP2 interacts with host
CC       ITGA4/ITGB1. Capsid protein VP3 interacts (via C-terminus) with VP1 in
CC       the cytoplasm. Capsid VP3 interacts with VP2 (By similarity).
CC       {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: [Capsid protein VP2]: Virion {ECO:0000305}. Host
CC       cytoplasm {ECO:0000305}.
CC   -!- SUBCELLULAR LOCATION: [Capsid protein VP3]: Virion {ECO:0000305}. Host
CC       cytoplasm {ECO:0000305}.
CC   -!- SUBCELLULAR LOCATION: [Structural peptide 1]: Virion {ECO:0000305}.
CC       Host cytoplasm {ECO:0000305}.
CC   -!- SUBCELLULAR LOCATION: [Structural peptide 2]: Virion {ECO:0000305}.
CC       Host cytoplasm {ECO:0000305}.
CC   -!- SUBCELLULAR LOCATION: [Structural peptide 3]: Virion {ECO:0000305}.
CC       Host cytoplasm {ECO:0000305}.
CC   -!- SUBCELLULAR LOCATION: [Structural peptide 4]: Virion {ECO:0000305}.
CC       Host cytoplasm {ECO:0000305}.
CC   -!- PTM: Specific enzymatic cleavages yield mature proteins. The capsid
CC       assembly seems to be regulated by polyprotein processing. The protease
CC       VP4 cleaves itself off the polyprotein, thus releasing pre-VP2 and VP3
CC       within the infected cell. During capsid assembly, the C-terminus of
CC       pre-VP2 is further processed by VP4, giving rise to VP2, the external
CC       capsid protein and three small peptides that all stay closely
CC       associated with the capsid (By similarity). {ECO:0000250}.
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DR   EMBL; X92760; CAA63416.1; -; Genomic_RNA.
DR   PIR; JC1327; JC1327.
DR   PIR; JQ2198; JQ2198.
DR   RefSeq; NP_690838.1; NC_004178.1.
DR   SMR; Q82635; -.
DR   GeneID; 956509; -.
DR   KEGG; vg:956509; -.
DR   Proteomes; UP000007249; Genome.
DR   GO; GO:0030430; C:host cell cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0019028; C:viral capsid; IEA:UniProtKB-KW.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0008236; F:serine-type peptidase activity; IEA:UniProtKB-KW.
DR   GO; GO:0005198; F:structural molecule activity; IEA:InterPro.
DR   Gene3D; 1.10.150.620; -; 1.
DR   Gene3D; 1.10.8.880; -; 1.
DR   Gene3D; 2.60.120.20; -; 1.
DR   InterPro; IPR002662; Birna_VP2.
DR   InterPro; IPR002663; Birna_VP3.
DR   InterPro; IPR043048; Birna_VP3_dom1.
DR   InterPro; IPR043049; Birna_VP3_dom2.
DR   InterPro; IPR025775; Birna_VP4_Prtase_dom.
DR   InterPro; IPR029053; Viral_coat.
DR   Pfam; PF01766; Birna_VP2; 1.
DR   Pfam; PF01767; Birna_VP3; 1.
DR   Pfam; PF01768; Birna_VP4; 1.
DR   PROSITE; PS51548; BIRNAVIRUS_VP4_PRO; 1.
PE   3: Inferred from homology;
KW   Capsid protein; Host cytoplasm; Hydrolase; Metal-binding; Protease;
KW   Reference proteome; Serine protease; Virion.
FT   CHAIN           1..1012
FT                   /note="Structural polyprotein"
FT                   /id="PRO_0000378358"
FT   CHAIN           1..512
FT                   /note="Precursor of VP2"
FT                   /id="PRO_0000378359"
FT   CHAIN           1..441
FT                   /note="Capsid protein VP2"
FT                   /id="PRO_0000378360"
FT   PEPTIDE         442..487
FT                   /note="Structural peptide 1"
FT                   /evidence="ECO:0000250"
FT                   /id="PRO_0000378361"
FT   PEPTIDE         488..494
FT                   /note="Structural peptide 2"
FT                   /evidence="ECO:0000250"
FT                   /id="PRO_0000378362"
FT   PEPTIDE         495..501
FT                   /note="Structural peptide 3"
FT                   /evidence="ECO:0000250"
FT                   /id="PRO_0000378363"
FT   PEPTIDE         502..512
FT                   /note="Structural peptide 4"
FT                   /evidence="ECO:0000250"
FT                   /id="PRO_0000378364"
FT   CHAIN           513..755
FT                   /note="Protease VP4"
FT                   /id="PRO_0000378365"
FT   CHAIN           756..1012
FT                   /note="Capsid protein VP3"
FT                   /id="PRO_0000378366"
FT   DOMAIN          513..755
FT                   /note="Peptidase S50"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00881"
FT   REGION          1003..1012
FT                   /note="Interaction with VP1 protein"
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        652
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00881"
FT   ACT_SITE        692
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00881"
FT   METAL           30
FT                   /note="Divalent metal cation; shared with trimeric
FT                   partners"
FT                   /evidence="ECO:0000250"
FT   SITE            441..442
FT                   /note="Cleavage; by protease VP4"
FT                   /evidence="ECO:0000250"
FT   SITE            487..488
FT                   /note="Cleavage; by protease VP4"
FT                   /evidence="ECO:0000250"
FT   SITE            494..495
FT                   /note="Cleavage; by protease VP4"
FT                   /evidence="ECO:0000250"
FT   SITE            501..502
FT                   /note="Cleavage; by protease VP4"
FT                   /evidence="ECO:0000250"
FT   SITE            512..513
FT                   /note="Cleavage; by protease VP4"
FT                   /evidence="ECO:0000250"
FT   SITE            755..756
FT                   /note="Cleavage; by protease VP4"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   1012 AA;  109307 MW;  04505B8632B634DE CRC64;
     MTNLQDQTQQ IVPFIRSLLM PTTGPASIPD DTLEKHTLRS ETSTYNLTVG DTGSGLIVFF
     PGFPGSIVGA HYTLQSNGNY KFDQMLLTAQ NLPASYNYCR LVSRSLTVRS STLPGGVYAL
     NGTINAVTFQ GSLSELTDVS YNGLMSATAN INDKIGNVLV GEGVTVLSLP TSYDLGYVRL
     GDPIPAIGLD PKMVATCDSS DRPRVYTITA ADDYQFSSQY QAGGVTITLF SANIDAITSL
     SIGGELVFQT SVQGLILGAT IYLIGFDGTA VITRAVAADN GLTAGTDNLM PFNIVIPTSE
     ITQPITSIKL EIVTSKSGGQ AGDQMSWSAS GSLAVTIHGG NYPGALRPVT LVAYERVATG
     SVVTVAGVSN FELIPNPELA KNLVTEYGRF DPGAMNYTKL ILSERDRLGI KTVWPTREYT
     DFREYFMEVA DLNSPLKIAG AFGFKDIIRA LRRIAVPVVS TLFPPAAPLA HAIGEGVDYL
     LGDEAQAASG TARAASGKAR AASGRIRQLT LAADKGYEVV ANLFQVPQNP VVDGILASPG
     ILRGAHNLDC VLREGATLFP VVITTVEDAM TPKALNSKMF AVIEGVREDL QPPSQRGSFI
     RTLSGHRVYG YAPDGVLPLE TGRVYTVVPI DGVWDDSIML SKDPIPPIVG SSGNLAIAYM
     DVFRPKVPIH VAMTGALNAY GEIENVSFRS TKLATAHRLG LKLAGPGAFD VNTGSNWATF
     IKRFPHNPRD WDRLPYLNLP YLPPNAGRQY DLAMAASEFK ETPELESAVR AMEAAANVDP
     LFQSALSVFM WLEENGIVTD MANFALSDPN AHRMRNFLAN APQAGSKSQR AKYGTAGYGV
     EARGPTPEGA QREKDTRISK KMETMGIYFA TPEWVALNGH RGPSPGQLKY WQNTREIPDP
     NEDYLDYVHA EKSRLASEGQ ILRAATSIYG APGQAEPPQA FIDEVAKVYE VNHGRGPNQE
     QMKDLLLTAM EMKHRNPRRA PPKPKPKPNV PTQRPPGRLG RWIRAVSDED LE
//
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