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[1]
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NUCLEOTIDE SEQUENCE [GENOMIC RNA].
DOI=10.1038/282575a0; PubMed=399329 [NCBI, ExPASy, EBI, Israel, Japan]
Pasek M.,
Goto T.,
Gilbert W.,
Zink B.,
Schaller H.,
McKay P.,
Leadbetter G.,
Murray K.;
"Hepatitis B virus genes and their expression in E. coli.";
Nature 282:575-579(1979).
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[2]
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FUNCTION.
PubMed=2854056 [NCBI, ExPASy, EBI, Israel, Japan]
Bartenschlager R.,
Schaller H.;
"The amino-terminal domain of the hepadnaviral P-gene encodes the terminal protein (genome-linked protein) believed to prime reverse transcription.";
EMBO J. 7:4185-4192(1988).
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[3]
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MUTAGENESIS OF 133-TYR-PRO-134; ASP-540; GLU-718; ALA-725 AND ASP-737.
PubMed=2153228 [NCBI, ExPASy, EBI, Israel, Japan]
Radziwill G.,
Tucker W.,
Schaller H.;
"Mutational analysis of the hepatitis B virus P gene product: domain structure and RNase H activity.";
J. Virol. 64:613-620(1990).
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[4]
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FUNCTION.
PubMed=1380455 [NCBI, ExPASy, EBI, Israel, Japan]
Bartenschlager R.,
Schaller H.;
"Hepadnaviral assembly is initiated by polymerase binding to the encapsidation signal in the viral RNA genome.";
EMBO J. 11:3413-3420(1992).
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[5]
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REVIEW.
PubMed=17206754 [NCBI, ExPASy, EBI, Israel, Japan]
Beck J.,
Nassal M.;
"Hepatitis B virus replication.";
World J. Gastroenterol. 13:48-64(2007).
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- FUNCTION: Multifunctional enzyme that converts the viral RNA genome into dsDNA in viral cytoplasmic capsids. This enzyme displays a DNA polymerase activity that can copy either DNA or RNA templates, and a ribonuclease H (RNase H) activity that cleaves the RNA strand of RNA-DNA heteroduplexes in a partially processive 3'- to 5'-endonucleasic mode. Neo-synthesized pregenomic RNA (pgRNA) are encapsidated together with the P protein, and reverse-transcribed inside the nucleocapsid. Initiation of reverse-transcription occurs first by binding the epsilon loop on the pgRNA genome, and is initiated by protein priming, thereby the 5'-end of (-)DNA is covalently linked to P protein. Partial (+)DNA is synthesized from the (-)DNA template and generates the relaxed circular DNA (RC-DNA) genome. After budding and infection, the RC-DNA migrates in the nucleus, and is converted into a plasmid-like covalently closed circular DNA (cccDNA). The activity of P protein does not seem to be necessary for cccDNA generation, and is presumably released from (+)DNA by host nuclear DNA repair machinery (By similarity).
- CATALYTIC ACTIVITY: Deoxynucleoside triphosphate + DNA(n) = diphosphate + DNA(n+1).
- CATALYTIC ACTIVITY: Endonucleolytic cleavage to 5'-phosphomonoester.
- ENZYME REGULATION: Activated by host HSP70 and HSP40 in vitro to be able to bind the epsilon loop of the pgRNA. Because deletion of the RNase H region renders the protein partly chaperone-independent, the chaperones may be needed indirectly to releive occlusion of the RNA-binding site by this domain. Inhibited by several reverse-transcriptase inhibitors: Lamivudine, Adefovir and Entecavir (By similarity).
- DOMAIN: Terminal protein domain (TP) is hepadnavirus-specific. Spacer domain is highly variable and separates the TP and RT domains. Polymerase/reverse-transcriptase domain (RT) and ribonuclease H domain (RH) are similar to retrovirus reverse transcriptase/RNase H (By similarity).
- DOMAIN: The polymerase/reverse transcriptase (RT) and ribonuclease H (RH) domains are structured in five subdomains: finger, palm, thumb, connection and RNase H. Within the palm subdomain, the 'primer grip' region is thought to be involved in the positioning of the primer terminus for accommodating the incoming nucleotide. The RH domain stabilizes the association of RT with primer-template (By similarity).
- MISCELLANEOUS: Hepadnaviral virions contain probably just one P protein molecule per particle (By similarity).
- SIMILARITY: Belongs to the hepadnaviridae P protein family.
- SIMILARITY: Contains 1 reverse transcriptase domain.
- WEB RESOURCE: Name=HepSEQ; Note=Hepatitis virus B database; URL="http://www.hpa-bioinfodatabases.org.uk/hepatitis_open/main.php";.
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Copyrighted by the UniProt Consortium, see http://www.uniprot.org/terms.
Distributed under the Creative Commons Attribution-NoDerivs License.
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| Length: 750 AA [This is the length of the partial sequence of the unprocessed precursor] |
Molecular weight: 84674 Da [This is the MW of the partial sequence of the unprocessed precursor] |
CRC64: 325F45EBC83EB07D [This is a checksum on the sequence] |
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10 20 30 40 50 60
MPLSYQRFRR LLLLDDEAGP LEEELPRLAD EDLNRRVAED LNLGNLNVSI PWTHKVGNFT
70 80 90 100 110 120
GLYSSTVPVF NPHWKPPSFP NIHLHQDIIK KCEQFVGPLT VNEKRRLKLI MPARFYPNFT
130 140 150 160 170 180
KYLPLDKGIK PYYPEHLVNH YFQTRHYLHT LWKAGVLYKR VSTHSASFCG SPYSWEQELQ
190 200 210 220 230 240
HGAESFHQQS SGILSRPPVG SSLQSKHQQS RLGLQSQQGH LARRQQGRSW SIRARVHPTA
250 260 270 280 290 300
RRPFGVEPSG SGHNANLASK SASCLYQSPV RTAAYPAVST SENHSSSGHA LELHNLPPNS
310 320 330 340 350 360
ARSQSERPVF PCWWLQFRDS KPCSDYYLSH IVNLLEDWGP CAEHGEHHIR IPRTPARVTG
370 380 390 400 410 420
GVFLVDKNPH NTAESRLVVD FSQFSRGNYR VSWPKFAVPN LQSLTNLLSS NLSWLSLDVS
430 440 450 460 470 480
AAFYHLPLHP AAMPHLLVGS SGLSRYVARL SSNSRIINHQ HGILQNLHDS CSRNLYVSLL
490 500 510 520 530 540
LLYKTFGWKL HLYSHPIILG FRKIPMGVGL SPFLLAQFTS AICSVVRRAF PHCLAFSYMD
550 560 570 580 590 600
DVVLGAKSVQ HLESLFTAVT NFLLSLGIHL NPNKTKRWGY SLNFMGYVIG CWGSLPQDHI
610 620 630 640 650 660
IHKIKECFRK LPVHRPIDWK VCQRIVGLLG FAAPFTQCGY PALMPLYACI QSKQAFTFSP
670 680 690 700 710 720
TYKAFLCKQY LNLYPVAEQR PGLCQVFADA TPTGWGLVMG HQRMRGTFLA PLPIHTAELL
730 740 750
AACFARSRSG ANILGTDNSV VLSRKYTSFP
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P03155 in FASTA format |
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ExPASy Home page
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