Gag-Pol polyprotein
Details
- Name
- Gag-Pol polyprotein
- Synonyms
- Pr160Gag-Pol
- Gene Name
- gag-pol
- Organism
- SIV-mac
- Amino acid sequence
>lcl|BSEQ0037147|Gag-Pol polyprotein MGARNSVLSGKKADELEKIRLRPGGKKKYMLKHVVWAANELDRFGLAESLLENKEGCQKI LSVLAPLVPTGSENLKSLYNTVCVIWCIHAEEKVKHTEEAKQIVQRHLVMETGTAETMPK TSRPTAPFSGRGGNYPVQQIGGNYTHLPLSPRTLNAWVKLIEEKKFGAEVVSGFQALSEG CLPYDINQMLNCVGDHQAAMQIIRDIINEEAADWDLQHPQQAPQQGQLREPSGSDIAGTT STVEEQIQWMYRQQNPIPVGNIYRRWIQLGLQKCVRMYNPTNILDVKQGPKEPFQSYVDR FYKSLRAEQTDPAVKNWMTQTLLIQNANPDCKLVLKGLGTNPTLEEMLTACQGVGGPGQK ARLMAEALKEALAPAPIPFAAAQQKGPRKPIKCWNCGKEGHSARQCRAPRRQGCWKCGKM DHVMAKCPNRQAGFFRPWPLGKEAPQFPHGSSASGADANCSPRRTSCGSAKELHALGQAA ERKQREALQGGDRGFAAPQFSLWRRPVVTAHIEGQPVEVLLDTGADDSIVTGIELGPHYT PKIVGGIGGFINTKEYKNVEIEVLGKRIKGTIMTGDTPINIFGRNLLTALGMSLNLPIAK VEPVKSPLKPGKDGPKLKQWPLSKEKIVALREICEKMEKDGQLEEAPPTNPYNTPTFAIK KKDKNKWRMLIDFRELNRVTQDFTEVQLGIPHPAGLAKRKRITVLDIGDAYFSIPLDEEF RQYTAFTLPSVNNAEPGKRYIYKVLPQGWKGSPAIFQYTMRHVLEPFRKANPDVTLVQYM DDILIASDRTDLEHDRVVLQLKELLNSIGFSSPEEKFQKDPPFQWMGYELWPTKWKLQKI ELPQRETWTVNDIQKLVGVLNWAAQIYPGIKTKHLCRLIRGKMTLTEEVQWTEMAEAEYE ENKIILSQEQEGCYYQESKPLEATVIKSQDNQWSYKIHQEDKILKVGKFAKIKNTHTNGV RLLAHVIQKIGKEAIVIWGQVPKFHLPVEKDVWEQWWTDYWQVTWIPEWDFISTPPLVRL VFNLVKDPIEGEETYYVDGSCSKQSKEGKAGYITDRGKDKVKVLEQTTNQQAELEAFLMA LTDSGPKANIIVDSQYVMGIITGCPTESESRLVNQIIEEMIKKTEIYVAWVPAHKGIGGN QEIDHLVSQGIRQVLFLEKIEPAQEEHSKYHSNIKELVFKFGLPRLVAKQIVDTCDKCHQ KGEAIHGQVNSDLGTWQMDCTHLEGKIVIVAVHVASGFIEAEVIPQETGRQTALFLLKLA SRWPITHLHTDNGANFASQEVKMVAWWAGIEHTFGVPYNPQSQGVVEAMNHHLKNQIDRI REQANSVETIVLMAVHCMNFKRRGGIGDMTPAERLINMITTEQEIQFQQSKNSKFKNFRV YYREGRDQLWKGPGELLWKGEGAVILKVGTDIKVVPRRKAKIIKDYGGGKEMDSSSHMED TGEAREVA
- Number of residues
- 1448
- Molecular Weight
- 163370.835
- Theoretical pI
- 8.02
- GO Classification
- Functionsaspartic-type endopeptidase activity / DNA binding / DNA-directed DNA polymerase activity / exoribonuclease H activity / RNA binding / RNA-directed DNA polymerase activity / RNA-DNA hybrid ribonuclease activity / structural molecule activity / zinc ion bindingProcessesDNA integration / DNA recombination / establishment of integrated proviral latency / suppression by virus of host gene expression / viral entry into host cell / viral penetration into host nucleus / viral release from host cellComponentshost cell cytoplasm / host cell nucleus / host cell plasma membrane / membrane / viral nucleocapsid
- General Function
- Zinc ion binding
- Specific Function
- Gag-Pol polyprotein and Gag polyprotein may regulate their own translation, by the binding genomic RNA in the 5'-UTR. At low concentration, Gag-Pol and Gag would promote translation, whereas at high concentration, the polyproteins encapsidate genomic RNA and then shutt off translation (By similarity).Matrix protein p17 has two main functions: in infected cell, it targets Gag and Gag-pol polyproteins to the plasma membrane via a multipartite membrane-binding signal, that includes its myristointegration complex. The myristoylation signal and the NLS exert conflicting influences its subcellular localization. The key regulation of these motifs might be phosphorylation of a portion of MA molecules on the C-terminal tyrosine at the time of virus maturation, by virion-associated cellular tyrosine kinase. Implicated in the release from host cell mediated by Vpu (By similarity).Capsid protein p24 forms the conical core that encapsulates the genomic RNA-nucleocapsid complex in the virion. The core is constituted by capsid protein hexamer subunits. The core is disassembled soon after virion entry. Interaction with host PPIA/CYPA protects the virus from restriction by host TRIM5-alpha and from an unknown antiviral activity in host cells. This capsid restriction by TRIM5 is one of the factors which restricts SIV to the simian species (By similarity).Nucleocapsid protein p7 encapsulates and protects viral dimeric unspliced (genomic) RNA. Binds these RNAs through its zinc fingers. Facilitates rearangement of nucleic acid secondary structure during retrotranscription of genomic RNA. This capability is referred to as nucleic acid chaperone activity (By similarity).The aspartyl protease mediates proteolytic cleavages of Gag and Gag-Pol polyproteins during or shortly after the release of the virion from the plasma membrane. Cleavages take place as an ordered, step-wise cascade to yield mature proteins. This process is called maturation. Displays maximal activity during the budding process just prior to particle release from the cell. Also cleaves Nef and Vif, probably concomitantly with viral structural proteins on maturation of virus particles. Hydrolyzes host EIF4GI and PABP1 in order to shut off the capped cellular mRNA translation. The resulting inhibition of cellular protein synthesis serves to ensure maximal viral gene expression and to evade host immune response (By similarity).Reverse transcriptase/ribonuclease H (RT) is a multifunctional enzyme that converts the viral dimeric RNA genome into dsDNA in the cytoplasm, shortly after virus entry into the cell. 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. Conversion of viral genomic RNA into dsDNA requires many steps. A tRNA binds to the primer-binding site (PBS) situated at the 5'-end of the viral RNA. RT uses the 3' end of the tRNA primer to perform a short round of RNA-dependent minus-strand DNA synthesis. The reading proceeds through the U5 region and ends after the repeated (R) region which is present at both ends of viral RNA. The portion of the RNA-DNA heteroduplex is digested by the RNase H, resulting in a ssDNA product attached to the tRNA primer. This ssDNA/tRNA hybridizes with the identical R region situated at the 3' end of viral RNA. This template exchange, known as minus-strand DNA strong stop transfer, can be either intra- or intermolecular. RT uses the 3' end of this newly synthesized short ssDNA to perform the RNA-dependent minus-strand DNA synthesis of the whole template. RNase H digests the RNA template except for two polypurine tracts (PPTs) situated at the 5'-end and near the center of the genome. It is not clear if both polymerase and RNase H activities are simultaneous. RNase H can probably proceed both in a polymerase-dependent (RNA cut into small fragments by the same RT performing DNA synthesis) and a polymerase-independent mode (cleavage of remaining RNA fragments by free RTs). Secondly, RT performs DNA-directed plus-strand DNA synthesis using the PPTs that have not been removed by RNase H as primers. PPTs and tRNA primers are then removed by RNase H. The 3' and 5' ssDNA PBS regions hybridize to form a circular dsDNA intermediate. Strand displacement synthesis by RT to the PBS and PPT ends produces a blunt ended, linear dsDNA copy of the viral genome that includes long terminal repeats (LTRs) at both ends (By similarity).Integrase catalyzes viral DNA integration into the host chromosome, by performing a series of DNA cutting and joining reactions. This enzyme activity takes place after virion entry into a cell and reverse transcription of the RNA genome in dsDNA. The first step in the integration process is 3' processing. This step requires a complex comprising the viral genome, matrix protein, Vpr and integrase. This complex is called the pre-integration complex (PIC). The integrase protein removes 2 nucleotides from each 3' end of the viral DNA, leaving recessed CA OH's at the 3' ends. In the second step, the PIC enters cell nucleus. This process is mediated through integrase and Vpr proteins, and allows the virus to infect a non dividing cell. This ability to enter the nucleus is specific of lentiviruses, other retroviruses cannot and rely on cell division to access cell chromosomes. In the third step, termed strand transfer, the integrase protein joins the previously processed 3' ends to the 5' ends of strands of target cellular DNA at the site of integration. The 5'-ends are produced by integrase-catalyzed staggered cuts, 5 bp apart. A Y-shaped, gapped, recombination intermediate results, with the 5'-ends of the viral DNA strands and the 3' ends of target DNA strands remaining unjoined, flanking a gap of 5 bp. The last step is viral DNA integration into host chromosome. This involves host DNA repair synthesis in which the 5 bp gaps between the unjoined strands are filled in and then ligated. Since this process occurs at both cuts flanking the SIV genome, a 5 bp duplication of host DNA is produced at the ends of SIV integration. Alternatively, Integrase may catalyze the excision of viral DNA just after strand transfer, this is termed disintegration (By similarity).
- Pfam Domain Function
- Transmembrane Regions
- Not Available
- Cellular Location
- Virion
- Gene sequence
>lcl|BSEQ0003530|3171 bp GTGTTGGAATTGTGGGAAGGAAGGACACTCTGCAAGGCAATGCAGAGCCCCAAGAAGACA GGGATGCTGGAAATGTGGAAAAATGGACCATGTTATGGCCAAATGCCCAAACAGACAGGC GGGTTTTTTAGGCCTTGGCCCTTGGGGAAAGAAGCCCCGCAATTTCCCCATGGCTCAAGT GCATCAGGGGCTGACGCCAACTGCTCCCCCAGAAGAACCAGCTGTGGATCTGCTAAAGAA CTACATGCACTTGGGCAAGCAGCAGAGAGAAAGCAGAGGGAAGCCTTACAAGGAGGTGAC AGAGGATTTGCTGCACCTCAATTCTCTCTTTGGAGGAGACCAGTAGTCACTGCTCATATT GAAGGACAGCCTGTAGAAGTATTATTAGATACAGGGGCTGATGATTCTATTGTAACAGGA ATAGAGTTAGGTCCACATTATACCCCAAAAATAGTAGGAGGAATAGGAGGTTTTATTAAT ACTAAAGAATACAAAAATGTAGAAATAGAAGTTTTAGGCAAAAGGATTAAAGGGACAATC ATGACAGGGGACACCCCGATTAACATTTTTGGTAGAAATTTACTAACAGCTCTGGGGATG TCTCTAAATCTTCCCATAGCTAAGGTAGAGCCTGTAAAGTCGCCCTTAAAGCCAGGAAAG GATGGACCAAAATTGAAGCAGTGGCCATTATCAAAAGAAAAGATAGTTGCATTAAGAGAA ATCTGTGAAAAGATGGAAAAAGATGGTCAGTTGGAGGAAGCTCCCCCGACCAATCCATAT AACACCCCCACATTTGCTATAAAGAAAAAGGATAAAAACAAATGGAGAATGCTGATAGAT TTTAGGGAACTAAATAGGGTCACTCAAGACTTTACGGAAGTCCAATTAGGAATACCACAC CCTGCAGGACTAGCAAAAAGGAAAAGGATTACAGTACTGGATATAGGTGACGCATATTTC TCTATACCTCTAGATGAAGAATTTAGGCAGTACACTGCCTTTACTTTACCATCAGTAAAT AATGCAGAGCCAGGAAAACGATACATTTATAAGGTTCTGCCTCAGGGATGGAAGGGGTCA CCAGCCATCTTCCAATACACTATGAGACATGTGCTAGAACCCTTCAGGAAGGCAAATCCA GATGTGACCTTAGTCCAGTATATGGATGACATCTTAATAGCTAGTGACAGGACAGACCTG GAACATGACAGGGTAGTTTTACAGTTAAAAGAACTCTTAAATAGCATAGGGTTTTCATCC CCAGAAGAGAAATTCCAAAAAGATCCCCCATTTCAATGGATGGGGTACGAATTGTGGCCG ACAAAATGGAAGTTGCAAAAGATAGAGTTGCCACAAAGAGAGACCTGGACAGTGAATGAT ATACAGAAGTTAGTAGGAGTATTAAATTGGGCAGCTCAAATTTATCCAGGTATAAAAACC AAACATCTCTGTAGGTTAATTAGAGGAAAAATGACTCTAACAGAGGAAGTTCAGTGGACT GAGATGGCAGAAGCAGAATATGAGGAAAATAAAATAATTCTCAGTCAGGAACAAGAAGGA TGTTATTACCAAGAAAGCAAGCCATTAGAAGCCACGGTGATAAAGAGTCAGGACAATCAG TGGTCTTATAAAATTCACCAAGAAGACAAAATACTGAAAGTAGGAAAATTTGCAAAGATA AAGAATACACATACCAATGGAGTTAGACTATTAGCACATGTAATACAGAAAATAGGAAAG GAAGCAATAGTGATCTGGGGACAGGTCCCAAAATTCCACTTACCAGTTGAGAAGGATGTA TGGGAACAGTGGTGGACAGACTATTGGCAGGTAACCTGGATACCGGAATGGGATTTCATC TCAACACCACCATTAGTAAGATTAGTCTTCAATCTAGTGAAGGACCCTATAGAGGGAGAA GAAACCTATTATGTAGATGGATCATGTAGTAAACAGTCAAAAGAAGGAAAAGCAGGATAT ATCACAGACAGGGGCAAAGACAAGGTAAAAGTGTTAGAACAGACTACTAATCAACAAGCA GAATTGGAAGCATTTCTCATGGCATTGACAGACTCAGGGCCAAAGGCAAATATTATAGTA GACTCACAATATGTTATGGGAATAATAACAGGATGCCCTACAGAATCAGAGAGCAGGCTA GTTAACCAAATAATAGAAGAAATGATCAAAAAGACAGAAATTTATGTGGCATGGGTACCA GCACACAAAGGTATAGGAGGAAACCAAGAAATAGACCACCTAGTTAGTCAAGGGATTAGA CAAGTTCTCTTCTTGGAAAAGATAGAGCCAGCACAAGAAGAACATAGTAAATACCATAGT AACATAAAAGAATTGGTATTCAAATTTGGATTACCCAGACTAGTGGCCAAACAGATAGTA GACACATGTGATAAATGTCATCAAAAAGGAGAAGCTATACATGGGCAGGTAAATTCAGAC CTAGGGACTTGGCAAATGGATTGTACCCATCTAGAGGGAAAAATAGTCATAGTTGCAGTA CATGTAGCTAGTGGATTCATAGAAGCAGAAGTAATTCCACAAGAAACAGGAAGACAGACA GCACTATTTCTGTTAAAATTGGCAAGCAGATGGCCTATTACACATCTGCACACAGATAAT GGTGCTAACTTTGCTTCGCAAGAAGTAAAGATGGTTGCATGGTGGGCAGGGATAGAGCAC ACCTTTGGGGTACCATACAATCCACAGAGTCAGGGAGTAGTGGAAGCAATGAATCACCAC CTGAAAAATCAAATAGATAGAATCAGGGAACAAGCAAATTCAGTAGAAACCATAGTATTA ATGGCAGTTCATTGCATGAATTTTAAAAGAAGGGGAGGAATAGGGGATATGACTCCAGCA GAAAGATTAATTAACATGATCACTACAGAACAAGAAATACAATTTCAACAATCAAAAAAC TCAAAATTTAAAAATTTTCGGGTCTATTACAGAGAAGGCAGAGATCAGCTGTGGAAGGGA CCCGGTGAGCTATTGTGGAAAGGGGAAGGAGCAGTCATCTTAAAGGTAGGAACAGACATT AAGGTAGTACCCAGGAGAAAGGCTAAAATTATCAAAGATTATGGAGGAGGAAAAGAGATG GATAGTAGTTCCCACATGGAGGATACCGGAGAGGCTAGAGAGGTGGCATAG
- Chromosome Location
- Not Available
- Locus
- Not Available
- External Identifiers
Resource Link UniProtKB ID P05896 UniProtKB Entry Name POL_SIVM1 GenBank Protein ID 61731 GenBank Gene ID Y00277 - General References
- Chakrabarti L, Guyader M, Alizon M, Daniel MD, Desrosiers RC, Tiollais P, Sonigo P: Sequence of simian immunodeficiency virus from macaque and its relationship to other human and simian retroviruses. Nature. 1987 Aug 6-12;328(6130):543-7. [Article]
- Rose RB, Craik CS, Stroud RM: Domain flexibility in retroviral proteases: structural implications for drug resistant mutations. Biochemistry. 1998 Feb 24;37(8):2607-21. [Article]