| Structural highlights
Function
[POL_HV1B1] 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).[1] 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 myristoylated N-terminus. The second function is to play a role in nuclear localization of the viral genome at the very start of cell infection. Matrix protein is the part of the pre-integration complex. It binds in the cytoplasm the human BAF protein which prevent autointegration of the viral genome, and might be included in virions at the ration of zero to 3 BAF dimer per virion. The myristoylation signal and the NLS thus 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).[2] Capsid protein p24 forms the conical core that encapsulates the genomic RNA-nucleocapsid complex in the virion. Most core are conical, with only 7% tubular. The core is constituted by capsid protein hexamer subunits. The core is disassembled soon after virion entry. Interaction with human PPIA/CYPA protects the virus from restriction by human TRIM5-alpha and from an unknown antiviral activity in human cells. This capsid restriction by TRIM5 is one of the factors which restricts HIV-1 to the human species (By similarity).[3] 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).[4] 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 (By similarity).[5] Reverse transcriptase/ribonuclease H (RT) is a multifunctional enzyme that converts the viral 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(3)-Lys 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 probably can 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).[6] 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 HIV genome, a 5 bp duplication of host DNA is produced at the ends of HIV-1 integration. Alternatively, Integrase may catalyze the excision of viral DNA just after strand transfer, this is termed disintegration (By similarity).[7]
Publication Abstract from PubMed
Polymorphisms have been poorly understood effects on drug susceptibility and may affect the outcome of HIV treatment. We have discovered that an HIV-1 reverse transcriptase (RT) polymorphism (RT172K) is present in clinical samples and in widely used laboratory strains (BH10) and profoundly affects HIV-1 susceptibility to both nucleoside (NRTIs) and nonnucleoside RT inhibitors (NNRTIs) when combined with certain mutations. Polymorphism 172K significantly suppressed AZT resistance caused by excision (e.g. thymidine associated mutations, TAMs), not by discrimination mechanism mutations (e.g. Q151M complex). Moreover it attenuated resistance to nevirapine or efavirenz imparted by NNRTI mutations. Although 172K favored RT-DNA binding at an excisable pre-translocation conformation, it decreased excision by TAM-containing RT. 172K affected DNA handling and decreased RT processivity without significantly affecting the kcat/Km for dNTP. Surface plasmon resonance experiments revealed that RT172K decreased DNA binding by increasing the dissociation rate. Hence, the increased AZT susceptibility of RT172K results from its increased dissociation from the chain-terminated DNA and reduced primer unblocking. We solved a high-resolution (2.15 A) crystal structure of RT mutated at 172 and compared crystal structures of RT172R and RT172K bound to NNRTIs or DNA/dNTP. Our structural analyses highlight differences in the interactions between alpha-helix E (where 172 resides) and active site beta9-strand that involve the YMDD loop and the NNRTI binding pocket. Such changes may increase dissociation of DNA, thus suppressing excision-based NRTI resistance, and also offset the effect of NNRTI resistance mutations thereby restoring NNRTI binding.
HIV-1 reverse transcriptase (RT) polymorphism 172K, suppresses the effect of clinically relevant drug resistance mutations to both nucleoside and nonnucleoside RT inhibitors.,Hachiya A, Marchand B, Kirby KA, Michailidis E, Tu X, Palczewski K, Ong YT, Li Z, Griffin DT, Schuckmann MM, Tanuma J, Oka S, Singh K, Kodama EN, Sarafianos SG J Biol Chem. 2012 Jul 2. PMID:22761416[8]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Smith CM, Leon O, Smith JS, Roth MJ. Sequence requirements for removal of tRNA by an isolated human immunodeficiency virus type 1 RNase H domain. J Virol. 1998 Aug;72(8):6805-12. PMID:9658129
- ↑ Smith CM, Leon O, Smith JS, Roth MJ. Sequence requirements for removal of tRNA by an isolated human immunodeficiency virus type 1 RNase H domain. J Virol. 1998 Aug;72(8):6805-12. PMID:9658129
- ↑ Smith CM, Leon O, Smith JS, Roth MJ. Sequence requirements for removal of tRNA by an isolated human immunodeficiency virus type 1 RNase H domain. J Virol. 1998 Aug;72(8):6805-12. PMID:9658129
- ↑ Smith CM, Leon O, Smith JS, Roth MJ. Sequence requirements for removal of tRNA by an isolated human immunodeficiency virus type 1 RNase H domain. J Virol. 1998 Aug;72(8):6805-12. PMID:9658129
- ↑ Smith CM, Leon O, Smith JS, Roth MJ. Sequence requirements for removal of tRNA by an isolated human immunodeficiency virus type 1 RNase H domain. J Virol. 1998 Aug;72(8):6805-12. PMID:9658129
- ↑ Smith CM, Leon O, Smith JS, Roth MJ. Sequence requirements for removal of tRNA by an isolated human immunodeficiency virus type 1 RNase H domain. J Virol. 1998 Aug;72(8):6805-12. PMID:9658129
- ↑ Smith CM, Leon O, Smith JS, Roth MJ. Sequence requirements for removal of tRNA by an isolated human immunodeficiency virus type 1 RNase H domain. J Virol. 1998 Aug;72(8):6805-12. PMID:9658129
- ↑ Hachiya A, Marchand B, Kirby KA, Michailidis E, Tu X, Palczewski K, Ong YT, Li Z, Griffin DT, Schuckmann MM, Tanuma J, Oka S, Singh K, Kodama EN, Sarafianos SG. HIV-1 reverse transcriptase (RT) polymorphism 172K, suppresses the effect of clinically relevant drug resistance mutations to both nucleoside and nonnucleoside RT inhibitors. J Biol Chem. 2012 Jul 2. PMID:22761416 doi:10.1074/jbc.M112.351551
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