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DPOL_HBVC9
ID   DPOL_HBVC9              Reviewed;         843 AA.
AC   P0C690;
DT   18-MAR-2008, integrated into UniProtKB/Swiss-Prot.
DT   18-MAR-2008, sequence version 1.
DT   03-AUG-2022, entry version 57.
DE   RecName: Full=Protein P {ECO:0000255|HAMAP-Rule:MF_04073};
DE   Includes:
DE     RecName: Full=DNA-directed DNA polymerase {ECO:0000255|HAMAP-Rule:MF_04073};
DE              EC=2.7.7.7 {ECO:0000255|HAMAP-Rule:MF_04073};
DE   Includes:
DE     RecName: Full=RNA-directed DNA polymerase {ECO:0000255|HAMAP-Rule:MF_04073};
DE              EC=2.7.7.49 {ECO:0000255|HAMAP-Rule:MF_04073};
DE   Includes:
DE     RecName: Full=Ribonuclease H {ECO:0000255|HAMAP-Rule:MF_04073};
DE              EC=3.1.26.4 {ECO:0000255|HAMAP-Rule:MF_04073};
GN   Name=P {ECO:0000255|HAMAP-Rule:MF_04073};
OS   Hepatitis B virus genotype C subtype ayw (isolate Australia/AustRC/1992)
OS   (HBV-C).
OC   Viruses; Riboviria; Pararnavirae; Artverviricota; Revtraviricetes;
OC   Blubervirales; Hepadnaviridae; Orthohepadnavirus;
OC   hepatitis B virus genotype C.
OX   NCBI_TaxID=489471;
OH   NCBI_TaxID=9606; Homo sapiens (Human).
OH   NCBI_TaxID=9598; Pan troglodytes (Chimpanzee).
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=11257194; DOI=10.1099/0022-1317-82-4-883;
RA   Sugauchi F., Mizokami M., Orito E., Ohno T., Kato H., Suzuki S., Kimura Y.,
RA   Ueda R., Butterworth L.A., Cooksley W.G.;
RT   "A novel variant genotype C of hepatitis B virus identified in isolates
RT   from Australian Aborigines: complete genome sequence and phylogenetic
RT   relatedness.";
RL   J. Gen. Virol. 82:883-892(2001).
RN   [2]
RP   REVIEW.
RX   PubMed=17206754; DOI=10.3748/wjg.v13.i1.48;
RA   Beck J., Nassal M.;
RT   "Hepatitis B virus replication.";
RL   World J. Gastroenterol. 13:48-64(2007).
CC   -!- FUNCTION: Multifunctional enzyme that converts the viral RNA genome
CC       into dsDNA in viral cytoplasmic capsids. This enzyme displays a DNA
CC       polymerase activity that can copy either DNA or RNA templates, and a
CC       ribonuclease H (RNase H) activity that cleaves the RNA strand of RNA-
CC       DNA heteroduplexes in a partially processive 3'- to 5'-endonucleasic
CC       mode. Neo-synthesized pregenomic RNA (pgRNA) are encapsidated together
CC       with the P protein, and reverse-transcribed inside the nucleocapsid.
CC       Initiation of reverse-transcription occurs first by binding the epsilon
CC       loop on the pgRNA genome, and is initiated by protein priming, thereby
CC       the 5'-end of (-)DNA is covalently linked to P protein. Partial (+)DNA
CC       is synthesized from the (-)DNA template and generates the relaxed
CC       circular DNA (RC-DNA) genome. After budding and infection, the RC-DNA
CC       migrates in the nucleus, and is converted into a plasmid-like
CC       covalently closed circular DNA (cccDNA). The activity of P protein does
CC       not seem to be necessary for cccDNA generation, and is presumably
CC       released from (+)DNA by host nuclear DNA repair machinery.
CC       {ECO:0000255|HAMAP-Rule:MF_04073}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a 2'-deoxyribonucleoside 5'-triphosphate + DNA(n) =
CC         diphosphate + DNA(n+1); Xref=Rhea:RHEA:22508, Rhea:RHEA-COMP:17339,
CC         Rhea:RHEA-COMP:17340, ChEBI:CHEBI:33019, ChEBI:CHEBI:61560,
CC         ChEBI:CHEBI:173112; EC=2.7.7.7; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_04073};
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a 2'-deoxyribonucleoside 5'-triphosphate + DNA(n) =
CC         diphosphate + DNA(n+1); Xref=Rhea:RHEA:22508, Rhea:RHEA-COMP:17339,
CC         Rhea:RHEA-COMP:17340, ChEBI:CHEBI:33019, ChEBI:CHEBI:61560,
CC         ChEBI:CHEBI:173112; EC=2.7.7.49; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_04073};
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=Endonucleolytic cleavage to 5'-phosphomonoester.; EC=3.1.26.4;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_04073};
CC   -!- ACTIVITY REGULATION: Activated by host HSP70 and HSP40 in vitro to be
CC       able to bind the epsilon loop of the pgRNA. Because deletion of the
CC       RNase H region renders the protein partly chaperone-independent, the
CC       chaperones may be needed indirectly to relieve occlusion of the RNA-
CC       binding site by this domain. Inhibited by several reverse-transcriptase
CC       inhibitors: Lamivudine, Adefovir and Entecavir. {ECO:0000255|HAMAP-
CC       Rule:MF_04073}.
CC   -!- DOMAIN: Terminal protein domain (TP) is hepadnavirus-specific. Spacer
CC       domain is highly variable and separates the TP and RT domains.
CC       Polymerase/reverse-transcriptase domain (RT) and ribonuclease H domain
CC       (RH) are similar to retrovirus reverse transcriptase/RNase H.
CC       {ECO:0000255|HAMAP-Rule:MF_04073}.
CC   -!- DOMAIN: The polymerase/reverse transcriptase (RT) and ribonuclease H
CC       (RH) domains are structured in five subdomains: finger, palm, thumb,
CC       connection and RNase H. Within the palm subdomain, the 'primer grip'
CC       region is thought to be involved in the positioning of the primer
CC       terminus for accommodating the incoming nucleotide. The RH domain
CC       stabilizes the association of RT with primer-template.
CC       {ECO:0000255|HAMAP-Rule:MF_04073}.
CC   -!- MISCELLANEOUS: Hepadnaviral virions contain probably just one P protein
CC       molecule per particle. {ECO:0000255|HAMAP-Rule:MF_04073}.
CC   -!- SIMILARITY: Belongs to the hepadnaviridae P protein family.
CC       {ECO:0000255|HAMAP-Rule:MF_04073}.
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DR   EMBL; AB048704; -; NOT_ANNOTATED_CDS; Genomic_DNA.
DR   Proteomes; UP000007927; Genome.
DR   GO; GO:0003677; F:DNA binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0003887; F:DNA-directed DNA polymerase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0003964; F:RNA-directed DNA polymerase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0004523; F:RNA-DNA hybrid ribonuclease activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0006260; P:DNA replication; IEA:UniProtKB-UniRule.
DR   GO; GO:0039503; P:suppression by virus of host innate immune response; IEA:UniProtKB-UniRule.
DR   Gene3D; 3.30.70.270; -; 1.
DR   HAMAP; MF_04073; HBV_DPOL; 1.
DR   InterPro; IPR043502; DNA/RNA_pol_sf.
DR   InterPro; IPR001462; DNApol_viral_C.
DR   InterPro; IPR000201; DNApol_viral_N.
DR   InterPro; IPR037531; HBV_DPOL.
DR   InterPro; IPR043128; Rev_trsase/Diguanyl_cyclase.
DR   InterPro; IPR000477; RT_dom.
DR   Pfam; PF00336; DNA_pol_viral_C; 1.
DR   Pfam; PF00242; DNA_pol_viral_N; 1.
DR   Pfam; PF00078; RVT_1; 1.
DR   SUPFAM; SSF56672; SSF56672; 1.
DR   PROSITE; PS50878; RT_POL; 1.
PE   3: Inferred from homology;
KW   DNA replication; DNA-binding; DNA-directed DNA polymerase; Endonuclease;
KW   Host-virus interaction; Hydrolase;
KW   Inhibition of host innate immune response by virus;
KW   Inhibition of host RLR pathway by virus; Magnesium; Metal-binding;
KW   Multifunctional enzyme; Nuclease; Nucleotidyltransferase;
KW   RNA-directed DNA polymerase; Transferase; Viral immunoevasion.
FT   CHAIN           1..843
FT                   /note="Protein P"
FT                   /id="PRO_0000323265"
FT   DOMAIN          357..600
FT                   /note="Reverse transcriptase"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04073"
FT   REGION          1..177
FT                   /note="Terminal protein domain (TP)"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04073"
FT   REGION          178..346
FT                   /note="Spacer"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04073"
FT   REGION          218..243
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          291..315
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          347..690
FT                   /note="Polymerase/reverse transcriptase domain (RT)"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04073"
FT   COMPBIAS        218..236
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   BINDING         429
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_note="catalytic"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04073"
FT   BINDING         551
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_note="catalytic"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04073"
FT   BINDING         552
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_note="catalytic"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04073"
FT   SITE            63
FT                   /note="Priming of reverse-transcription by covalently
FT                   linking the first nucleotide of the (-)DNA"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04073"
SQ   SEQUENCE   843 AA;  94536 MW;  719D2DF862472A84 CRC64;
     MPLSYQHFRK LLLLDDEAGP LEEELPRLAD EGLNRRVAED LNLGNPNVSI PWTHKVGNFT
     GLYSSTVPVF NPDWQTPKFP DIHLKEDIIN RCQNYVGPLT VNEKRRLKLI MPARFYPTLT
     KYLPLEKGIK PYYPEHAVNH YFKTRHYLHT LWKAGILYKR ETTRSASFCG SPYSWEQELQ
     HGRLVFQTSE RHGDESFCSQ SSGILSRSPV GPCVRSQLKQ SRLGLQPQQG SLARGKSGRS
     GSIRARVHPT TRRFFGVEPA GPGHIDNSAS SSSSCIHQSA VRKTTHSHLT TAQRHSPSGH
     AVEFHSIPPS SAGSQSKGSV FSCWWLQFRN SKPCSEYCLS HLINLHEDWG PCIEHGEHNI
     RIPRTPARVT GGVFLVDKNP HNTSESRLVV DFSQFSRGSS RVYWPKFAVP NLQSLTNLLS
     SNLSWLSLDV SAAFYHLPLH PAAMPHLLVG SSGLSRYVAR LSSTSRINDH QHGTLQNLHD
     HCSRNLYVSL MLLYKTFGRK LHLYSHPIIL GFRKIPMGVG LSPFLLAQFT SAICSVVRRA
     FPHCLAFSYM DDLVLGAKSV QHLESLFTAV TNFLMSLGIH LNPHKTKRWG YSLNFMGYVI
     GSWGSLPQEH IVHKLKHCFR KLPVNRPIDW KVCQRIVGLL GFAAPFTQCG YPALMPLYAC
     IQAKQAFTFS PTYKAFLCKQ YLNLYPVARQ RAGLCQVFAD ATPTGWGLAI GHQRVRGTFV
     APLPIHTAEL LAACFARSRS GANILGTDNS VVLSRKYTSF PWLLGCAANW ILRGTSFVYV
     PSALNPADDP SRGRLGIYRP LLRLPFRPST GRTSLYADSP SVPSHLPDRV HFASPLHVAW
     RPP
 
 
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