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Yoshida Y, Niimi Y, Fushihara D, Katakura H, Fukui R, Murase H, Tomoike F, Hashiya F, Murakami T, Kodama EN, Suzuki T, Yasukawa K, Kimura Y, Abe H. 2'-β-Methylselenyl nucleos(t)ide analogs as reverse transcriptase inhibitors against diverse HIV mutants. Bioorg Med Chem 2024; 110:117813. [PMID: 38954919 DOI: 10.1016/j.bmc.2024.117813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Revised: 06/18/2024] [Accepted: 06/20/2024] [Indexed: 07/04/2024]
Abstract
Nucleoside reverse transcriptase inhibitors (NRTIs) have been extensively studied as drugs targeting HIV RT. However, the practice or use of approved NRTIs lacking the 3'-hydroxy group often promotes frequent HIV mutations and generates drug-resistance. Here, we describe a novel NRTI with 2'-β-methylselenyl modification. We found that this modification inhibited the DNA elongation reaction by HIV-1 RT despite having a 3'-hydroxy group. Moreover, the conformation of this nucleoside analog is controlled at C3'-endo, a conformation that resists excision from the elongating DNA by HIV RT. Accordingly, the designed analogs exhibited activity against both wild-type HIV and multidrug-resistant HIV mutants.
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Affiliation(s)
- Yuki Yoshida
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Yushi Niimi
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Daichi Fushihara
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Hideo Katakura
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Ryusuke Fukui
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Hirotaka Murase
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Fumiaki Tomoike
- Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Fumitaka Hashiya
- Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Tsutomu Murakami
- AIDS Research Center, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Eiichi N Kodama
- International Research Institute of Disaster Science, Graduate School of Medicine, and Tohoku Medical Megabank Organization, Tohoku University, 2-1, Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575, Japan
| | - Tetsuro Suzuki
- Department of Microbiology and Immunology, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
| | - Kiyoshi Yasukawa
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Yasuaki Kimura
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan.
| | - Hiroshi Abe
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan; CREST, Japan Science and Technology Agency 7, Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan; Institute for Glyco-core Research (iGCORE), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan.
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2
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Cilento ME, Kirby KA, Sarafianos SG. Avoiding Drug Resistance in HIV Reverse Transcriptase. Chem Rev 2021; 121:3271-3296. [PMID: 33507067 DOI: 10.1021/acs.chemrev.0c00967] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
HIV reverse transcriptase (RT) is an enzyme that plays a major role in the replication cycle of HIV and has been a key target of anti-HIV drug development efforts. Because of the high genetic diversity of the virus, mutations in RT can impart resistance to various RT inhibitors. As the prevalence of drug resistance mutations is on the rise, it is necessary to design strategies that will lead to drugs less susceptible to resistance. Here we provide an in-depth review of HIV reverse transcriptase, current RT inhibitors, novel RT inhibitors, and mechanisms of drug resistance. We also present novel strategies that can be useful to overcome RT's ability to escape therapies through drug resistance. While resistance may not be completely avoidable, designing drugs based on the strategies and principles discussed in this review could decrease the prevalence of drug resistance.
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Affiliation(s)
- Maria E Cilento
- Laboratory of Biochemical Pharmacology, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia 30322, United States.,Children's Healthcare of Atlanta, Atlanta, Georgia 30307, United States
| | - Karen A Kirby
- Laboratory of Biochemical Pharmacology, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia 30322, United States.,Children's Healthcare of Atlanta, Atlanta, Georgia 30307, United States
| | - Stefan G Sarafianos
- Laboratory of Biochemical Pharmacology, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia 30322, United States.,Children's Healthcare of Atlanta, Atlanta, Georgia 30307, United States
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3
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Nucleocapsid Protein Precursors NCp9 and NCp15 Suppress ATP-Mediated Rescue of AZT-Terminated Primers by HIV-1 Reverse Transcriptase. Antimicrob Agents Chemother 2020; 64:AAC.00958-20. [PMID: 32747359 DOI: 10.1128/aac.00958-20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 07/29/2020] [Indexed: 01/20/2023] Open
Abstract
In HIV-1, development of resistance to AZT (3'-azido-3'-deoxythymidine) is mediated by the acquisition of thymidine analogue resistance mutations (TAMs) (i.e., M41L, D67N, K70R, L210W, T215F/Y, and K219E/Q) in the viral reverse transcriptase (RT). Clinically relevant combinations of TAMs, such as M41L/T215Y or D67N/K70R/T215F/K219Q, enhance the ATP-mediated excision of AZT monophosphate (AZTMP) from the 3' end of the primer, allowing DNA synthesis to continue. Additionally, during HIV-1 maturation, the Gag polyprotein is cleaved to release a mature nucleocapsid protein (NCp7) and two intermediate precursors (NCp9 and NCp15). NC proteins interact with the viral genome and facilitate the reverse transcription process. Using wild-type and TAM-containing RTs, we showed that both NCp9 and NCp15 inhibited ATP-mediated rescue of AZTMP-terminated primers annealed to RNA templates but not DNA templates, while NCp7 had no effect on rescue activity. RNase H inactivation by introducing the active-site mutation E478Q led to the loss of the inhibitory effect shown by NCp9. NCp15 had a stimulatory effect on the RT's RNase H activity not observed with NCp7 and NCp9. However, analysis of RNase H cleavage patterns revealed that in the presence of NCp9, RNA/DNA complexes containing duplexes of 12 bp had reduced stability in comparison with those obtained in the absence of NC or with NCp7 or NCp15. These effects are expected to have a strong influence on the inhibitory action of NCp9 and NCp15 by affecting the efficiency of RNA-dependent DNA polymerization after unblocking DNA primers terminated with AZTMP and other nucleotide analogues.
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Maldonado JO, Mansky LM. The HIV-1 Reverse Transcriptase A62V Mutation Influences Replication Fidelity and Viral Fitness in the Context of Multi-Drug-Resistant Mutations. Viruses 2018; 10:v10070376. [PMID: 30029500 PMCID: PMC6070896 DOI: 10.3390/v10070376] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 07/03/2018] [Accepted: 07/11/2018] [Indexed: 02/04/2023] Open
Abstract
Emergence of human immunodeficiency virus type 1 (HIV-1) drug resistance arises from mutation fixation in the viral genome during antiretroviral therapy. Primary mutations directly confer antiviral drug resistance, while secondary mutations arise that do not confer drug resistance. The A62V amino acid substitution in HIV-1 reverse transcriptase (RT) was observed to be associated with multi-drug resistance, but is not known to be a resistance-conferring mutation. In particular, A62V was observed in various multi-dideoxynucleoside resistant (MDR) mutation complexes, including the Q151M complex (i.e., A62V, V75I, F77L, F116Y, and Q151M), and the T69SSS insertion complex, which has a serine–serine insertion between amino acid positions 69 and 70 (i.e., M41L, A62V, T69SSS, K70R, and T215Y). However, what selective advantage is conferred to the virus remains unresolved. In this study, we hypothesized that A62V could influence replication fidelity and viral fitness with viruses harboring the Q151M and T69SSS MDR mutation complexes. A single-cycle replication assay and a dual-competition fitness assay were used to assess viral mutant frequency and viral fitness, respectively. A62V was found to increase the observed lower mutant frequency identified with each of the viruses harboring the MDR mutation complexes in the single-cycle assay. Furthermore, A62V was observed to improve viral fitness of replication-competent MDR viruses. Taken together, these observations indicate an adaptive role of A62V in virus replication fidelity and viral fitness, which would likely enhance virus persistence during drug-selective pressure.
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Affiliation(s)
- José O Maldonado
- Institute for Molecular Virology & DDS-PhD Dual Degree Program, University of Minnesota-Twin Cities, 18-242 Moos Tower, 515 Delaware Street SE, Minneapolis, MN 55455, USA.
| | - Louis M Mansky
- Institute for Molecular Virology, University of Minnesota-Twin Cities, 18-242 Moos Tower, 515 Delaware Street SE, Minneapolis, MN 55455, USA.
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Álvarez M, Nevot M, Mendieta J, Martínez MA, Menéndez-Arias L. Amino acid residues in HIV-2 reverse transcriptase that restrict the development of nucleoside analogue resistance through the excision pathway. J Biol Chem 2017; 293:2247-2259. [PMID: 29275329 DOI: 10.1074/jbc.ra117.000177] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 12/21/2017] [Indexed: 01/13/2023] Open
Abstract
Nucleoside reverse transcriptase (RT) inhibitors (NRTIs) are the backbone of current antiretroviral treatments. However, the emergence of viral resistance against NRTIs is a major threat to their therapeutic effectiveness. In HIV-1, NRTI resistance-associated mutations either reduce RT-mediated incorporation of NRTI triphosphates (discrimination mechanism) or confer an ATP-mediated nucleotide excision activity that removes the inhibitor from the 3' terminus of DNA primers, enabling further primer elongation (excision mechanism). In HIV-2, resistance to zidovudine (3'-azido-3'-deoxythymidine (AZT)) and other NRTIs is conferred by mutations affecting nucleotide discrimination. Mutations of the excision pathway such as M41L, D67N, K70R, or S215Y (known as thymidine-analogue resistance mutations (TAMs)) are rare in the virus from HIV-2-infected individuals. Here, we demonstrate that mutant M41L/D67N/K70R/S215Y HIV-2 RT lacks ATP-dependent excision activity, and recombinant virus containing this RT remains susceptible to AZT inhibition. Mutant HIV-2 RTs were tested for their ability to unblock and extend DNA primers terminated with AZT and other NRTIs, when complexed with RNA or DNA templates. Our results show that Met73 and, to a lesser extent, Ile75 suppress excision activity when TAMs are present in the HIV-2 RT. Interestingly, recombinant HIV-2 carrying a mutant D67N/K70R/M73K RT showed 10-fold decreased AZT susceptibility and increased rescue efficiency on AZT- or tenofovir-terminated primers, as compared with the double-mutant D67N/K70R. Molecular dynamics simulations reveal that Met73influences β3-β4 hairpin loop conformation, whereas its substitution affects hydrogen bond interactions at position 70, required for NRTI excision. Our work highlights critical HIV-2 RT residues impeding the development of excision-mediated NRTI resistance.
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Affiliation(s)
- Mar Álvarez
- From the Centro de Biología Molecular "Severo Ochoa" (Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid), c/Nicolás Cabrera, 1, Campus de Cantoblanco, 28049 Madrid
| | - María Nevot
- the Laboratori de Retrovirologia, Fundació irsiCaixa, Hospital Universitari Germans Trias i Pujol, Badalona, 08916 Barcelona, and
| | - Jesús Mendieta
- From the Centro de Biología Molecular "Severo Ochoa" (Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid), c/Nicolás Cabrera, 1, Campus de Cantoblanco, 28049 Madrid.,the Departamento de Biotecnología, Universidad Francisco de Vitoria, Pozuelo de Alarcón, 28223 Madrid, Spain
| | - Miguel A Martínez
- the Laboratori de Retrovirologia, Fundació irsiCaixa, Hospital Universitari Germans Trias i Pujol, Badalona, 08916 Barcelona, and
| | - Luis Menéndez-Arias
- From the Centro de Biología Molecular "Severo Ochoa" (Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid), c/Nicolás Cabrera, 1, Campus de Cantoblanco, 28049 Madrid,
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6
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Structural Insights into HIV Reverse Transcriptase Mutations Q151M and Q151M Complex That Confer Multinucleoside Drug Resistance. Antimicrob Agents Chemother 2017; 61:AAC.00224-17. [PMID: 28396546 DOI: 10.1128/aac.00224-17] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Accepted: 03/28/2017] [Indexed: 12/26/2022] Open
Abstract
HIV-1 reverse transcriptase (RT) is targeted by multiple drugs. RT mutations that confer resistance to nucleoside RT inhibitors (NRTIs) emerge during clinical use. Q151M and four associated mutations, A62V, V75I, F77L, and F116Y, were detected in patients failing therapies with dideoxynucleosides (didanosine [ddI], zalcitabine [ddC]) and/or zidovudine (AZT). The cluster of the five mutations is referred to as the Q151M complex (Q151Mc), and an RT or virus containing Q151Mc exhibits resistance to multiple NRTIs. To understand the structural basis for Q151M and Q151Mc resistance, we systematically determined the crystal structures of the wild-type RT/double-stranded DNA (dsDNA)/dATP (complex I), wild-type RT/dsDNA/ddATP (complex II), Q151M RT/dsDNA/dATP (complex III), Q151Mc RT/dsDNA/dATP (complex IV), and Q151Mc RT/dsDNA/ddATP (complex V) ternary complexes. The structures revealed that the deoxyribose rings of dATP and ddATP have 3'-endo and 3'-exo conformations, respectively. The single mutation Q151M introduces conformational perturbation at the deoxynucleoside triphosphate (dNTP)-binding pocket, and the mutated pocket may exist in multiple conformations. The compensatory set of mutations in Q151Mc, particularly F116Y, restricts the side chain flexibility of M151 and helps restore the DNA polymerization efficiency of the enzyme. The altered dNTP-binding pocket in Q151Mc RT has the Q151-R72 hydrogen bond removed and has a switched conformation for the key conserved residue R72 compared to that in wild-type RT. On the basis of a modeled structure of hepatitis B virus (HBV) polymerase, the residues R72, Y116, M151, and M184 in Q151Mc HIV-1 RT are conserved in wild-type HBV polymerase as residues R41, Y89, M171, and M204, respectively; functionally, both Q151Mc HIV-1 and wild-type HBV are resistant to dideoxynucleoside analogs.
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7
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Martín V, Perales C, Fernández-Algar M, Dos Santos HG, Garrido P, Pernas M, Parro V, Moreno M, García-Pérez J, Alcamí J, Torán JL, Abia D, Domingo E, Briones C. An Efficient Microarray-Based Genotyping Platform for the Identification of Drug-Resistance Mutations in Majority and Minority Subpopulations of HIV-1 Quasispecies. PLoS One 2016; 11:e0166902. [PMID: 27959928 PMCID: PMC5154500 DOI: 10.1371/journal.pone.0166902] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 11/04/2016] [Indexed: 02/07/2023] Open
Abstract
The response of human immunodeficiency virus type 1 (HIV-1) quasispecies to antiretroviral therapy is influenced by the ensemble of mutants that composes the evolving population. Low-abundance subpopulations within HIV-1 quasispecies may determine the viral response to the administered drug combinations. However, routine sequencing assays available to clinical laboratories do not recognize HIV-1 minority variants representing less than 25% of the population. Although several alternative and more sensitive genotyping techniques have been developed, including next-generation sequencing (NGS) methods, they are usually very time consuming, expensive and require highly trained personnel, thus becoming unrealistic approaches in daily clinical practice. Here we describe the development and testing of a HIV-1 genotyping DNA microarray that detects and quantifies, in majority and minority viral subpopulations, relevant mutations and amino acid insertions in 42 codons of the pol gene associated with drug- and multidrug-resistance to protease (PR) and reverse transcriptase (RT) inhibitors. A customized bioinformatics protocol has been implemented to analyze the microarray hybridization data by including a new normalization procedure and a stepwise filtering algorithm, which resulted in the highly accurate (96.33%) detection of positive/negative signals. This microarray has been tested with 57 subtype B HIV-1 clinical samples extracted from multi-treated patients, showing an overall identification of 95.53% and 89.24% of the queried PR and RT codons, respectively, and enough sensitivity to detect minority subpopulations representing as low as 5–10% of the total quasispecies. The developed genotyping platform represents an efficient diagnostic and prognostic tool useful to personalize antiviral treatments in clinical practice.
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Affiliation(s)
- Verónica Martín
- Centro de Biología Molecular ‘Severo Ochoa’ (CBMSO, CSIC-UAM). Campus de Cantoblanco, Madrid, Spain
| | - Celia Perales
- Centro de Biología Molecular ‘Severo Ochoa’ (CBMSO, CSIC-UAM). Campus de Cantoblanco, Madrid, Spain
- Centro de Investigación Biomédica en Red de enfermedades hepáticas y digestivas (CIBERehd), Spain
- Liver Unit, Internal Medicine, Laboratory of Malalties Hepàtiques, Vall d’Hebron Institut de Recerca-Hospital Universitari Vall d´Hebron (VHIR-HUVH), Universitat Autònoma de Barcelona. Barcelona, Spain
| | - María Fernández-Algar
- Department of Molecular Evolution, Centro de Astrobiología (CAB, CSIC-INTA). Torrejón de Ardoz, Madrid, Spain
| | - Helena G. Dos Santos
- Centro de Biología Molecular ‘Severo Ochoa’ (CBMSO, CSIC-UAM). Campus de Cantoblanco, Madrid, Spain
| | - Patricia Garrido
- Biotherapix, SLU. Parque Tecnológico de Madrid, Tres Cantos, Madrid. Spain
| | - María Pernas
- Biotherapix, SLU. Parque Tecnológico de Madrid, Tres Cantos, Madrid. Spain
| | - Víctor Parro
- Department of Molecular Evolution, Centro de Astrobiología (CAB, CSIC-INTA). Torrejón de Ardoz, Madrid, Spain
| | - Miguel Moreno
- Department of Molecular Evolution, Centro de Astrobiología (CAB, CSIC-INTA). Torrejón de Ardoz, Madrid, Spain
| | - Javier García-Pérez
- AIDS Immunopathogenesis Unit, Instituto de Salud Carlos III. Majadahonda, Madrid, Spain
| | - José Alcamí
- AIDS Immunopathogenesis Unit, Instituto de Salud Carlos III. Majadahonda, Madrid, Spain
| | - José Luis Torán
- Biotherapix, SLU. Parque Tecnológico de Madrid, Tres Cantos, Madrid. Spain
| | - David Abia
- Centro de Biología Molecular ‘Severo Ochoa’ (CBMSO, CSIC-UAM). Campus de Cantoblanco, Madrid, Spain
| | - Esteban Domingo
- Centro de Biología Molecular ‘Severo Ochoa’ (CBMSO, CSIC-UAM). Campus de Cantoblanco, Madrid, Spain
- Centro de Investigación Biomédica en Red de enfermedades hepáticas y digestivas (CIBERehd), Spain
| | - Carlos Briones
- Centro de Investigación Biomédica en Red de enfermedades hepáticas y digestivas (CIBERehd), Spain
- Department of Molecular Evolution, Centro de Astrobiología (CAB, CSIC-INTA). Torrejón de Ardoz, Madrid, Spain
- * E-mail:
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8
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Impact of human immunodeficiency virus type-1 sequence diversity on antiretroviral therapy outcomes. Viruses 2014; 6:3855-72. [PMID: 25333465 PMCID: PMC4213566 DOI: 10.3390/v6103855] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 10/09/2014] [Accepted: 10/13/2014] [Indexed: 12/04/2022] Open
Abstract
Worldwide circulating HIV-1 genomes show extensive variation represented by different subtypes, polymorphisms and drug-resistant strains. Reports on the impact of sequence variation on antiretroviral therapy (ART) outcomes are mixed. In this review, we summarize relevant published data from both resource-rich and resource-limited countries in the last 10 years on the impact of HIV-1 sequence diversity on treatment outcomes. The prevalence of transmission of drug resistant mutations (DRMs) varies considerably, ranging from 0% to 27% worldwide. Factors such as geographic location, access and availability to ART, duration since inception of treatment programs, quality of care, risk-taking behaviors, mode of transmission, and viral subtype all dictate the prevalence in a particular geographical region. Although HIV-1 subtype may not be a good predictor of treatment outcome, review of emerging evidence supports the fact that HIV-1 genome sequence-resulting from natural polymorphisms or drug-associated mutations-matters when it comes to treatment outcomes. Therefore, continued surveillance of drug resistant variants in both treatment-naïve and treatment-experienced populations is needed to reduce the transmission of DRMs and to optimize the efficacy of the current ART armamentarium.
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9
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Singh K, Flores JA, Kirby KA, Neogi U, Sonnerborg A, Hachiya A, Das K, Arnold E, McArthur C, Parniak M, Sarafianos SG. Drug resistance in non-B subtype HIV-1: impact of HIV-1 reverse transcriptase inhibitors. Viruses 2014; 6:3535-62. [PMID: 25254383 PMCID: PMC4189038 DOI: 10.3390/v6093535] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 09/09/2014] [Accepted: 09/09/2014] [Indexed: 01/20/2023] Open
Abstract
Human immunodeficiency virus (HIV) causes approximately 2.5 million new infections every year, and nearly 1.6 million patients succumb to HIV each year. Several factors, including cross-species transmission and error-prone replication have resulted in extraordinary genetic diversity of HIV groups. One of these groups, known as group M (main) contains nine subtypes (A-D, F-H and J-K) and causes ~95% of all HIV infections. Most reported data on susceptibility and resistance to anti-HIV therapies are from subtype B HIV infections, which are prevalent in developed countries but account for only ~12% of all global HIV infections, whereas non-B subtype HIV infections that account for ~88% of all HIV infections are prevalent primarily in low and middle-income countries. Although the treatments for subtype B infections are generally effective against non-B subtype infections, there are differences in response to therapies. Here, we review how polymorphisms, transmission efficiency of drug-resistant strains, and differences in genetic barrier for drug resistance can differentially alter the response to reverse transcriptase-targeting therapies in various subtypes.
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Affiliation(s)
- Kamalendra Singh
- Christopher Bond Life Sciences Center, University of Missouri, Columbia, MO 65211, USA.
| | - Jacqueline A Flores
- Christopher Bond Life Sciences Center, University of Missouri, Columbia, MO 65211, USA.
| | - Karen A Kirby
- Christopher Bond Life Sciences Center, University of Missouri, Columbia, MO 65211, USA.
| | - Ujjwal Neogi
- Division of Clinical Microbiology, Department of Laboratory Medicine, Karolinska Institute, Stockholm 141 86, Sweden.
| | - Anders Sonnerborg
- Division of Clinical Microbiology, Department of Laboratory Medicine, Karolinska Institute, Stockholm 141 86, Sweden.
| | - Atsuko Hachiya
- Clinical Research Center, Department of Infectious Diseases and Immunology, National Hospital Organization, Nagoya Medical Center, Nagoya 460-0001, Japan.
| | - Kalyan Das
- Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, NJ 08854, USA.
| | - Eddy Arnold
- Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, NJ 08854, USA.
| | - Carole McArthur
- Department of Oral and Craniofacial Science , School of Dentistry, University of Missouri, Kansas City, MO 64108, USA.
| | - Michael Parniak
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA.
| | - Stefan G Sarafianos
- Christopher Bond Life Sciences Center, University of Missouri, Columbia, MO 65211, USA.
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Megens S, Vaira D, De Baets G, Dekeersmaeker N, Schrooten Y, Li G, Schymkowitz J, Rousseau F, Vandamme AM, Moutschen M, Van Laethem K. Horizontal gene transfer from human host to HIV-1 reverse transcriptase confers drug resistance and partly compensates for replication deficits. Virology 2014; 456-457:310-8. [DOI: 10.1016/j.virol.2014.03.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 01/24/2014] [Accepted: 03/22/2014] [Indexed: 10/25/2022]
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11
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Li Z, Terry B, Olds W, Protack T, Deminie C, Minassian B, Nowicka-Sans B, Sun Y, Dicker I, Hwang C, Lataillade M, Hanna GJ, Krystal M. In vitro cross-resistance profile of nucleoside reverse transcriptase inhibitor (NRTI) BMS-986001 against known NRTI resistance mutations. Antimicrob Agents Chemother 2013; 57:5500-8. [PMID: 23979732 PMCID: PMC3811251 DOI: 10.1128/aac.01195-13] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Accepted: 08/14/2013] [Indexed: 01/03/2023] Open
Abstract
BMS-986001 is a novel HIV nucleoside reverse transcriptase inhibitor (NRTI). To date, little is known about its resistance profile. In order to examine the cross-resistance profile of BMS-986001 to NRTI mutations, a replicating virus system was used to examine specific amino acid mutations known to confer resistance to various NRTIs. In addition, reverse transcriptases from 19 clinical isolates with various NRTI mutations were examined in the Monogram PhenoSense HIV assay. In the site-directed mutagenesis studies, a virus containing a K65R substitution exhibited a 0.4-fold change in 50% effective concentration (EC50) versus the wild type, while the majority of viruses with the Q151M constellation (without M184V) exhibited changes in EC50 versus wild type of 0.23- to 0.48-fold. Susceptibility to BMS-986001 was also maintained in an L74V-containing virus (0.7-fold change), while an M184V-only-containing virus induced a 2- to 3-fold decrease in susceptibility. Increasing numbers of thymidine analog mutation pattern 1 (TAM-1) pathway mutations correlated with decreases in susceptibility to BMS-986001, while viruses with TAM-2 pathway mutations exhibited a 5- to 8-fold decrease in susceptibility, regardless of the number of TAMs. A 22-fold decrease in susceptibility to BMS-986001 was observed in a site-directed mutant containing the T69 insertion complex. Common non-NRTI (NNRTI) mutations had little impact on susceptibility to BMS-986001. The results from the site-directed mutants correlated well with the more complicated genotypes found in NRTI-resistant clinical isolates. Data from clinical studies are needed to determine the clinically relevant resistance cutoff values for BMS-986001.
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Affiliation(s)
- Zhufang Li
- Bristol-Myers Squibb, Research and Development, Wallingford, Connecticut, USA
| | - Brian Terry
- Bristol-Myers Squibb, Research and Development, Wallingford, Connecticut, USA
| | - William Olds
- Bristol-Myers Squibb, Research and Development, Wallingford, Connecticut, USA
| | - Tricia Protack
- Bristol-Myers Squibb, Research and Development, Wallingford, Connecticut, USA
| | - Carol Deminie
- Bristol-Myers Squibb, Research and Development, Wallingford, Connecticut, USA
| | - Beatrice Minassian
- Bristol-Myers Squibb, Research and Development, Wallingford, Connecticut, USA
| | - Beata Nowicka-Sans
- Bristol-Myers Squibb, Research and Development, Wallingford, Connecticut, USA
| | - Yongnian Sun
- Bristol-Myers Squibb, Research and Development, Wallingford, Connecticut, USA
| | - Ira Dicker
- Bristol-Myers Squibb, Research and Development, Wallingford, Connecticut, USA
| | - Carey Hwang
- Bristol-Myers Squibb, Research and Development, Hopewell, New Jersey, USA
| | - Max Lataillade
- Bristol-Myers Squibb, Research and Development, Wallingford, Connecticut, USA
| | - George J. Hanna
- Bristol-Myers Squibb, Research and Development, Princeton, New Jersey, USA
| | - Mark Krystal
- Bristol-Myers Squibb, Research and Development, Wallingford, Connecticut, USA
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12
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Das K, Arnold E. HIV-1 reverse transcriptase and antiviral drug resistance. Part 2. Curr Opin Virol 2013; 3:119-28. [PMID: 23602470 DOI: 10.1016/j.coviro.2013.03.014] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2013] [Revised: 03/12/2013] [Accepted: 03/20/2013] [Indexed: 11/29/2022]
Abstract
Structures of RT and its complexes combined with biochemical and clinical data help in illuminating the molecular mechanisms of different drug-resistance mutations. The NRTI drugs that are used in combinations have different primary mutation sites. RT mutations that confer resistance to one drug can be hypersensitive to another RT drug. Structure of an RT-DNA-nevirapine complex revealed how NNRTI binding forbids RT from forming a polymerase competent complex. Collective knowledge about various mechanisms of drug resistance by RT has broader implications for understanding and targeting drug resistance in general. In Part 1, we discussed the role of RT in developing HIV-1 drug resistance, structural and functional states of RT, and the nucleoside/nucleotide analog (NRTI) and non-nucleoside (NNRTI) drugs used in treating HIV-1 infections. In this part, we discuss structural understanding of various mechanisms by which RT confers antiviral drug resistance.
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Affiliation(s)
- Kalyan Das
- Center for Advanced Biotechnology and Medicine (CABM), Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ 08854, USA
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13
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Menéndez-Arias L. Molecular basis of human immunodeficiency virus type 1 drug resistance: overview and recent developments. Antiviral Res 2013; 98:93-120. [PMID: 23403210 DOI: 10.1016/j.antiviral.2013.01.007] [Citation(s) in RCA: 162] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Revised: 01/26/2013] [Accepted: 01/29/2013] [Indexed: 12/15/2022]
Abstract
The introduction of potent combination therapies in the mid-90s had a tremendous effect on AIDS mortality. However, drug resistance has been a major factor contributing to antiretroviral therapy failure. Currently, there are 26 drugs approved for treating human immunodeficiency virus (HIV) infections, although some of them are no longer prescribed. Most of the available antiretroviral drugs target HIV genome replication (i.e. reverse transcriptase inhibitors) and viral maturation (i.e. viral protease inhibitors). Other drugs in clinical use include a viral coreceptor antagonist (maraviroc), a fusion inhibitor (enfuvirtide) and two viral integrase inhibitors (raltegravir and elvitegravir). Elvitegravir and the nonnucleoside reverse transcriptase inhibitor rilpivirine have been the most recent additions to the antiretroviral drug armamentarium. An overview of the molecular mechanisms involved in antiretroviral drug resistance and the role of drug resistance-associated mutations was previously presented (Menéndez-Arias, L., 2010. Molecular basis of human immunodeficiency virus drug resistance: an update. Antiviral Res. 85, 210-231). This article provides now an updated review that covers currently approved drugs, new experimental agents (e.g. neutralizing antibodies) and selected drugs in preclinical or early clinical development (e.g. experimental integrase inhibitors). Special attention is dedicated to recent research on resistance to reverse transcriptase and integrase inhibitors. In addition, recently discovered interactions between HIV and host proteins and novel strategies to block HIV assembly or viral entry emerge as promising alternatives for the development of effective antiretroviral treatments.
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Affiliation(s)
- Luis Menéndez-Arias
- Centro de Biología Molecular "Severo Ochoa"-Consejo Superior de Investigaciones Científicas & Universidad Autónoma de Madrid, c/ Nicolás Cabrera 1, Campus de Cantoblanco, 28049 Madrid, Spain.
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14
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Ducloux C, Mougel M, Goldschmidt V, Didierlaurent L, Marquet R, Isel C. A pyrophosphatase activity associated with purified HIV-1 particles. Biochimie 2012; 94:2498-507. [PMID: 22766015 DOI: 10.1016/j.biochi.2012.06.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Accepted: 06/22/2012] [Indexed: 01/17/2023]
Abstract
Treatment of HIV-1 with nucleoside reverse transcription inhibitors leads to the emergence of resistance mutations in the reverse transcriptase (RT) gene. Resistance to 3'-azido-3'-deoxythymidine (AZT) and to a lesser extent to 2'-3'-didehydro-2'-3'-dideoxythymidine is mediated by phosphorolytic excision of the chain terminator. Wild-type RT excises AZT by pyrophosphorolysis, while thymidine-associated resistance mutations in RT (TAMs) favour ATP as the donor substrate. However, in vitro, resistant RT still uses pyrophosphate more efficiently than ATP. We performed in vitro (-) strong-stop DNA synthesis experiments, with wild-type and AZT-resistant HIV-1 RTs, in the presence of physiologically relevant pyrophosphate and/or ATP concentrations and found that in the presence of pyrophosphate, ATP and AZTTP, TAMs do not enhance in vitro (-) strong-stop DNA synthesis. We hypothesized that utilisation of ATP in vivo is driven by intrinsic low pyrophosphate concentrations within the reverse transcription complex, which could be explained by the packaging of a cellular pyrophosphatase. We showed that over-expressed flagged-pyrophosphatase was associated with HIV-1 viral-like particles. In addition, we demonstrated that when HIV-1 particles were purified in order to avoid cellular microvesicle contamination, a pyrophosphatase activity was specifically associated to them. The presence of a pyrophosphatase activity in close proximity to the reverse transcription complex is most likely advantageous to the virus, even in the absence of any drug pressure.
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Affiliation(s)
- Céline Ducloux
- Architecture et Réactivité de l'ARN, Université de Strasbourg, CNRS, IBMC, 15 Rue René Descartes, 67084 Strasbourg, France.
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15
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Sierra S, Walter H. Targets for Inhibition of HIV Replication: Entry, Enzyme Action, Release and Maturation. Intervirology 2012; 55:84-97. [DOI: 10.1159/000331995] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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16
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Altered strand transfer activity of a multiple-drug-resistant human immunodeficiency virus type 1 reverse transcriptase mutant with a dipeptide fingers domain insertion. J Mol Biol 2011; 415:248-62. [PMID: 22100453 DOI: 10.1016/j.jmb.2011.11.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Revised: 11/01/2011] [Accepted: 11/06/2011] [Indexed: 11/23/2022]
Abstract
Prolonged highly active anti-retroviral therapy with multiple nucleoside reverse transcriptase inhibitors for the treatment of patients infected with human immunodeficiency virus type 1 (HIV-1) can induce the development of an HIV-1 reverse transcriptase (RT) harboring a dipeptide insertion at the RT fingers domain with a background thymidine analog mutation. This mutation renders viral resistance to multiple nucleoside reverse transcriptase inhibitors. We investigated the effect of the dipeptide fingers domain insertion mutation on strand transfer activity using two clinical RT variants isolated during the pre-treatment and post-treatment of an infected patient, termed pre-drug RT without dipeptide insertion and post-drug RT with Ser-Gly insertion, respectively. First, the post-drug RT displayed elevated strand transfer activity compared to the pre-drug RT, with two different RNA templates. Second, the post-drug RT exhibited less RNA template degradation than the pre-drug RT but higher polymerization-dependent RNase H activity. Third, the post-drug RT had a faster association rate (k(on)) for template binding and a lower equilibrium binding constant K(d) for the template, leading to a template binding affinity tighter than that of the pre-drug RT. The k(off) values for the pre-drug RT and the post-drug RT were similar. Finally, the removal of the dipeptide insertion from the post-drug RT abolished the elevated strand transfer activity and RNase H activity, in addition to the loss of azidothymidine resistance. These biochemical data suggest that the dipeptide insertion elevates strand transfer activity by increasing the interaction of the RT with the RNA donor template, promoting cleavage that generates more invasion sites for the acceptor template during DNA synthesis.
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17
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Ibe S, Sugiura W. Clinical significance of HIV reverse-transcriptase inhibitor-resistance mutations. Future Microbiol 2011; 6:295-315. [PMID: 21449841 DOI: 10.2217/fmb.11.7] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
In this article, we summarize recent knowledge on drug-resistance mutations within HIV reverse transcriptase (RT). Several large-scale HIV-1 genotypic analyses have revealed that the most prevalent nucleos(t)ide analog RT inhibitor (NRTI)-resistance mutation is M184V/I followed by a series of thymidine analog-associated mutations: M41L, D67N, K70R, L210W, T215Y/F and K219Q/E. Among non-nucleoside RT inhibitor (NNRTI)-resistance mutations, K103N was frequently observed, followed by Y181C and G190A. Interestingly, V106M was identified in HIV-1 subtype C as a subtype-specific multi-NNRTI-resistance mutation. Regarding mutations in the HIV-1 RT C-terminal region, including the connection subdomain and RNase H domain, their clinical impacts are still controversial, although their effects on NRTI and NNRTI resistance have been confirmed in vitro. In HIV-2 infections, the high prevalence of the Q151M mutation associated with multi-NRTI resistance has been frequently observed.
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Affiliation(s)
- Shiro Ibe
- Department of Infection & Immunology, Clinical Research Center, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
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18
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Hachiya A, Kodama EN, Schuckmann MM, Kirby KA, Michailidis E, Sakagami Y, Oka S, Singh K, Sarafianos SG. K70Q adds high-level tenofovir resistance to "Q151M complex" HIV reverse transcriptase through the enhanced discrimination mechanism. PLoS One 2011; 6:e16242. [PMID: 21249155 PMCID: PMC3020970 DOI: 10.1371/journal.pone.0016242] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2010] [Accepted: 12/08/2010] [Indexed: 11/21/2022] Open
Abstract
HIV-1 carrying the “Q151M complex” reverse transcriptase (RT) mutations (A62V/V75I/F77L/F116Y/Q151M, or Q151Mc) is resistant to many FDA-approved nucleoside RT inhibitors (NRTIs), but has been considered susceptible to tenofovir disoproxil fumarate (TFV-DF or TDF). We have isolated from a TFV-DF-treated HIV patient a Q151Mc-containing clinical isolate with high phenotypic resistance to TFV-DF. Analysis of the genotypic and phenotypic testing over the course of this patient's therapy lead us to hypothesize that TFV-DF resistance emerged upon appearance of the previously unreported K70Q mutation in the Q151Mc background. Virological analysis showed that HIV with only K70Q was not significantly resistant to TFV-DF. However, addition of K70Q to the Q151Mc background significantly enhanced resistance to several approved NRTIs, and also resulted in high-level (10-fold) resistance to TFV-DF. Biochemical experiments established that the increased resistance to tenofovir is not the result of enhanced excision, as K70Q/Q151Mc RT exhibited diminished, rather than enhanced ATP-based primer unblocking activity. Pre-steady state kinetic analysis of the recombinant enzymes demonstrated that addition of the K70Q mutation selectively decreases the binding of tenofovir-diphosphate (TFV-DP), resulting in reduced incorporation of TFV into the nascent DNA chain. Molecular dynamics simulations suggest that changes in the hydrogen bonding pattern in the polymerase active site of K70Q/Q151Mc RT may contribute to the observed changes in binding and incorporation of TFV-DP. The novel pattern of TFV-resistance may help adjust therapeutic strategies for NRTI-experienced patients with multi-drug resistant (MDR) mutations.
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Affiliation(s)
- Atsuko Hachiya
- Department of Molecular Microbiology and Immunology, University of Missouri School of Medicine, Columbia, Missouri, United States of America
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Eiichi N. Kodama
- Division of Emerging Infectious Diseases, Tohoku University School of Medicine, Sendai, Japan
- * E-mail: (SGS); (ENK)
| | - Matthew M. Schuckmann
- Department of Molecular Microbiology and Immunology, University of Missouri School of Medicine, Columbia, Missouri, United States of America
| | - Karen A. Kirby
- Department of Molecular Microbiology and Immunology, University of Missouri School of Medicine, Columbia, Missouri, United States of America
| | - Eleftherios Michailidis
- Department of Molecular Microbiology and Immunology, University of Missouri School of Medicine, Columbia, Missouri, United States of America
| | - Yasuko Sakagami
- Institute for Virus Research, Kyoto University, Kyoto, Japan
| | - Shinichi Oka
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Kamalendra Singh
- Department of Molecular Microbiology and Immunology, University of Missouri School of Medicine, Columbia, Missouri, United States of America
| | - Stefan G. Sarafianos
- Department of Molecular Microbiology and Immunology, University of Missouri School of Medicine, Columbia, Missouri, United States of America
- * E-mail: (SGS); (ENK)
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Scarth B, McCormick S, Götte M. Effects of mutations F61A and A62V in the fingers subdomain of HIV-1 reverse transcriptase on the translocational equilibrium. J Mol Biol 2010; 405:349-60. [PMID: 21056575 DOI: 10.1016/j.jmb.2010.10.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2010] [Revised: 09/30/2010] [Accepted: 10/08/2010] [Indexed: 01/20/2023]
Abstract
Changes of the translocational status of human immunodeficiency virus type 1 (HIV-1) reverse transcriptase (RT) can affect susceptibility to antiretroviral drugs. The pyrophosphate analogue phosphonoformic acid (PFA) binds specifically to and traps the pretranslocated complex of HIV-1 RT, while nucleotide-competing RT inhibitors trap the posttranslocated conformation. Here, we attempted to assess the potential role of residues in the fingers subdomain as determinants of polymerase translocation. The fingers can exist in open and closed conformations; however, the relationship between such conformational changes and the translocation status of HIV-1 RT remains elusive. We focused on substitution F61A and the neighboring A62V that is frequently associated with drug-resistance-conferring mutations. The proximity of these residues to the nucleic acid substrate suggested a possible role in translocation for these amino acid changes. We employed site-specific footprinting, binding assays, and DNA-synthesis inhibition experiments to study F61A and A62V, alone and against a background of known drug-resistance mutations. We demonstrate that F61A causes a strong bias to the posttranslocational state, while A62V shows a subtle bias toward pretranslocation regardless of the mutational background. Increases in the population of pretranslocated complexes were accompanied by increases in PFA activity, while F61A is literally resistant to PFA. Our data shed light on equilibria between pre- and posttranslocated complexes with the fingers subdomain in its open or closed conformations. We propose that a binary, pretranslocated complex in a closed conformation is stabilized with A62V and destabilized with F61A.
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Affiliation(s)
- Brian Scarth
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec, Canada
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20
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Betancor G, Puertas MC, Nevot M, Garriga C, Martínez MA, Martinez-Picado J, Menéndez-Arias L. Mechanisms involved in the selection of HIV-1 reverse transcriptase thumb subdomain polymorphisms associated with nucleoside analogue therapy failure. Antimicrob Agents Chemother 2010; 54:4799-811. [PMID: 20733040 PMCID: PMC2976120 DOI: 10.1128/aac.00716-10] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2010] [Revised: 07/06/2010] [Accepted: 08/17/2010] [Indexed: 12/15/2022] Open
Abstract
Previous studies showed an increased prevalence of human immunodeficiency virus type 1 (HIV-1) reverse transcriptase (RT) thumb subdomain polymorphisms Pro272, Arg277, and Thr286 in patients failing therapy with nucleoside analogue combinations. Interestingly, wild-type HIV-1(BH10) RT contains Pro272, Arg277, and Thr286. Here, we demonstrate that in the presence of zidovudine, HIV-1(BH10) RT mutations P272A/R277K/T286A produce a significant reduction of the viral replication capacity in peripheral blood mononuclear cells in both the absence and presence of M41L/T215Y. In studies carried out with recombinant enzymes, we show that RT thumb subdomain mutations decrease primer-unblocking activity on RNA/DNA complexes, but not on DNA/DNA template-primers. These effects were observed with primers terminated with thymidine analogues (i.e., zidovudine and stavudine) and carbovir (the relevant derivative of abacavir) and were more pronounced when mutations were introduced in the wild-type HIV-1(BH10) RT sequence context. RT thumb subdomain mutations increased by 2-fold the apparent dissociation equilibrium constant (K(d)) for RNA/DNA without affecting the K(d) for DNA/DNA substrates. RNase H assays carried out with RNA/DNA complexes did not reveal an increase in the reaction rate or in secondary cleavage events that could account for the decreased excision activity. The interaction of Arg277 with the phosphate backbone of the RNA template in HIV-1 RT bound to RNA/DNA and the location of Thr286 close to the RNA strand are consistent with thumb polymorphisms playing a role in decreasing nucleoside RT inhibitor excision activity on RNA/DNA template-primers by affecting interactions with the template-primer duplex without involvement of the RNase H activity of the enzyme.
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Affiliation(s)
- Gilberto Betancor
- Centro de Biología Molecular “Severo Ochoa” (Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid), c/Nicolás Cabrera 1, Campus de Cantoblanco, 28049 Madrid, Spain, Fundació irsiCaixa, Hospital Universitari Germans Trias i Pujol, 08916 Badalona, Spain, Centro Nacional de Epidemiología, Instituto de Salud Carlos III, 28029 Madrid, Spain, Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain
| | - Maria C. Puertas
- Centro de Biología Molecular “Severo Ochoa” (Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid), c/Nicolás Cabrera 1, Campus de Cantoblanco, 28049 Madrid, Spain, Fundació irsiCaixa, Hospital Universitari Germans Trias i Pujol, 08916 Badalona, Spain, Centro Nacional de Epidemiología, Instituto de Salud Carlos III, 28029 Madrid, Spain, Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain
| | - María Nevot
- Centro de Biología Molecular “Severo Ochoa” (Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid), c/Nicolás Cabrera 1, Campus de Cantoblanco, 28049 Madrid, Spain, Fundació irsiCaixa, Hospital Universitari Germans Trias i Pujol, 08916 Badalona, Spain, Centro Nacional de Epidemiología, Instituto de Salud Carlos III, 28029 Madrid, Spain, Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain
| | - César Garriga
- Centro de Biología Molecular “Severo Ochoa” (Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid), c/Nicolás Cabrera 1, Campus de Cantoblanco, 28049 Madrid, Spain, Fundació irsiCaixa, Hospital Universitari Germans Trias i Pujol, 08916 Badalona, Spain, Centro Nacional de Epidemiología, Instituto de Salud Carlos III, 28029 Madrid, Spain, Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain
| | - Miguel A. Martínez
- Centro de Biología Molecular “Severo Ochoa” (Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid), c/Nicolás Cabrera 1, Campus de Cantoblanco, 28049 Madrid, Spain, Fundació irsiCaixa, Hospital Universitari Germans Trias i Pujol, 08916 Badalona, Spain, Centro Nacional de Epidemiología, Instituto de Salud Carlos III, 28029 Madrid, Spain, Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain
| | - Javier Martinez-Picado
- Centro de Biología Molecular “Severo Ochoa” (Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid), c/Nicolás Cabrera 1, Campus de Cantoblanco, 28049 Madrid, Spain, Fundació irsiCaixa, Hospital Universitari Germans Trias i Pujol, 08916 Badalona, Spain, Centro Nacional de Epidemiología, Instituto de Salud Carlos III, 28029 Madrid, Spain, Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain
| | - Luis Menéndez-Arias
- Centro de Biología Molecular “Severo Ochoa” (Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid), c/Nicolás Cabrera 1, Campus de Cantoblanco, 28049 Madrid, Spain, Fundació irsiCaixa, Hospital Universitari Germans Trias i Pujol, 08916 Badalona, Spain, Centro Nacional de Epidemiología, Instituto de Salud Carlos III, 28029 Madrid, Spain, Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain
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Tu X, Das K, Han Q, Bauman JD, Clark AD, Hou X, Frenkel YV, Gaffney BL, Jones RA, Boyer PL, Hughes SH, Sarafianos SG, Arnold E. Structural basis of HIV-1 resistance to AZT by excision. Nat Struct Mol Biol 2010; 17:1202-9. [PMID: 20852643 PMCID: PMC2987654 DOI: 10.1038/nsmb.1908] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2010] [Accepted: 07/20/2010] [Indexed: 02/02/2023]
Abstract
Human immunodeficiency virus (HIV-1) develops resistance to 3'-azido-2',3'-deoxythymidine (AZT, zidovudine) by acquiring mutations in reverse transcriptase that enhance the ATP-mediated excision of AZT monophosphate from the 3' end of the primer. The excision reaction occurs at the dNTP-binding site, uses ATP as a pyrophosphate donor, unblocks the primer terminus and allows reverse transcriptase to continue viral DNA synthesis. The excision product is AZT adenosine dinucleoside tetraphosphate (AZTppppA). We determined five crystal structures: wild-type reverse transcriptase-double-stranded DNA (RT-dsDNA)-AZTppppA; AZT-resistant (AZTr; M41L D67N K70R T215Y K219Q) RT-dsDNA-AZTppppA; AZTr RT-dsDNA terminated with AZT at dNTP- and primer-binding sites; and AZTr apo reverse transcriptase. The AMP part of AZTppppA bound differently to wild-type and AZTr reverse transcriptases, whereas the AZT triphosphate part bound the two enzymes similarly. Thus, the resistance mutations create a high-affinity ATP-binding site. The structure of the site provides an opportunity to design inhibitors of AZT-monophosphate excision.
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Affiliation(s)
- Xiongying Tu
- Center for Advanced Biotechnology and Medicine, Piscataway, New Jersey, USA
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Abstract
HIV-1 Reverse Transcriptase (HIV-1 RT) has been the target of numerous approved anti-AIDS drugs that are key components of Highly Active Anti-Retroviral Therapies (HAART). It remains the target of extensive structural studies that continue unabated for almost twenty years. The crystal structures of wild-type or drug-resistant mutant HIV RTs in the unliganded form or in complex with substrates and/or drugs have offered valuable glimpses into the enzyme’s folding and its interactions with DNA and dNTP substrates, as well as with nucleos(t)ide reverse transcriptase inhibitor (NRTI) and non-nucleoside reverse transcriptase inhibitor (NNRTIs) drugs. These studies have been used to interpret a large body of biochemical results and have paved the way for innovative biochemical experiments designed to elucidate the mechanisms of catalysis and drug inhibition of polymerase and RNase H functions of RT. In turn, the combined use of structural biology and biochemical approaches has led to the discovery of novel mechanisms of drug resistance and has contributed to the design of new drugs with improved potency and ability to suppress multi-drug resistant strains.
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Das K, Bandwar RP, White KL, Feng JY, Sarafianos SG, Tuske S, Tu X, Clark AD, Boyer PL, Hou X, Gaffney BL, Jones RA, Miller MD, Hughes SH, Arnold E. Structural basis for the role of the K65R mutation in HIV-1 reverse transcriptase polymerization, excision antagonism, and tenofovir resistance. J Biol Chem 2009; 284:35092-100. [PMID: 19812032 PMCID: PMC2787370 DOI: 10.1074/jbc.m109.022525] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
K65R is a primary reverse transcriptase (RT) mutation selected in human immunodeficiency virus type 1-infected patients taking antiretroviral regimens containing tenofovir disoproxil fumarate or other nucleoside analog RT drugs. We determined the crystal structures of K65R mutant RT cross-linked to double-stranded DNA and in complexes with tenofovir diphosphate (TFV-DP) or dATP. The crystals permit substitution of TFV-DP with dATP at the dNTP-binding site. The guanidinium planes of the arginines K65R and Arg72 were stacked to form a molecular platform that restricts the conformational adaptability of both of the residues, which explains the negative effects of the K65R mutation on nucleotide incorporation and on excision. Furthermore, the guanidinium planes of K65R and Arg72 were stacked in two different rotameric conformations in TFV-DP- and dATP-bound structures that may help explain how K65R RT discriminates the drug from substrates. These K65R-mediated effects on RT structure and function help us to visualize the complex interaction with other key nucleotide RT drug resistance mutations, such as M184V, L74V, and thymidine analog resistance mutations.
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Affiliation(s)
- Kalyan Das
- Center for Advanced Biotechnology and Medicine (CABM), Rutgers University, Piscataway, New Jersey 08854, USA
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Matamoros T, Nevot M, Martínez MA, Menéndez-Arias L. Thymidine analogue resistance suppression by V75I of HIV-1 reverse transcriptase: effects of substituting valine 75 on stavudine excision and discrimination. J Biol Chem 2009; 284:32792-802. [PMID: 19801659 DOI: 10.1074/jbc.m109.038885] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Val(75) of HIV-1 reverse transcriptase (RT) plays a role in positioning the template nucleotide +1 during the formation of the ternary complex. Mutations, such as V75M and V75A, emerge in patients infected with HIV-1 group M subtype B and group O variants, after failing treatment with stavudine (d4T) and other nucleoside RT inhibitors. V75I is an accessory mutation of the Q151M multidrug resistance complex of HIV-1 RT and is rarely associated with thymidine analogue resistance mutations (TAMs). In vitro, it confers resistance to acyclovir. TAMs confer resistance to zidovudine (AZT) and d4T by increasing the rate of ATP-mediated excision of the terminal nucleotide monophosphate (primer unblocking). In a wild-type HIV-1 group O RT sequence context, V75A and V75M conferred increased excision activity on d4T-terminated primers, in the presence of PP(i). In contrast, V75I decreased the PP(i)-mediated unblocking efficiency on AZT and d4T-terminated primers, in different sequence contexts (i.e. wild-type group M subtype B or group O RTs). Interestingly, in the sequence context of an excision-proficient RT (i.e. M41L/A62V/T69SSS/K70R/T215Y), the introduction of V75I led to a significant decrease of its ATP-dependent excision activity on AZT-, d4T-, and acyclovir-terminated primers. The excision rate of d4T-monophosphate in the presence of ATP (3.2 mm) was about 10 times higher for M41L/A62V/T69SSS/K70R/T215Y than for the mutant M41L/A62V/T69SSS/K70R/V75I/T215Y RT. The antagonistic effect of V75I with TAMs was further demonstrated in phenotypic assays. Recombinant HIV-1 containing the M41L/A62V/T69SSS/K70R/V75I/T215Y RT showed 18.3- and 1.5-fold increased susceptibility to AZT and d4T, respectively, in comparison with virus containing the M41L/A62V/T69SSS/K70R/T215Y RT.
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Affiliation(s)
- Tania Matamoros
- Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, c/Nicolás Cabrera 1, Campus de Cantoblanco, 28049 Madrid, Spain
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Menéndez-Arias L. Molecular basis of human immunodeficiency virus drug resistance: an update. Antiviral Res 2009; 85:210-31. [PMID: 19616029 DOI: 10.1016/j.antiviral.2009.07.006] [Citation(s) in RCA: 133] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2009] [Revised: 06/26/2009] [Accepted: 07/03/2009] [Indexed: 11/25/2022]
Abstract
Antiretroviral therapy has led to a significant decrease in human immunodeficiency virus (HIV)-related mortality. Approved antiretroviral drugs target different steps of the viral life cycle including viral entry (coreceptor antagonists and fusion inhibitors), reverse transcription (nucleoside and non-nucleoside inhibitors of the viral reverse transcriptase), integration (integrase inhibitors) and viral maturation (protease inhibitors). Despite the success of combination therapies, the emergence of drug resistance is still a major factor contributing to therapy failure. Viral resistance is caused by mutations in the HIV genome coding for structural changes in the target proteins that can affect the binding or activity of the antiretroviral drugs. This review provides an overview of the molecular mechanisms involved in the acquisition of resistance to currently used and promising investigational drugs, emphasizing the structural role of drug resistance mutations. The optimization of current antiretroviral drug regimens and the development of new drugs are still challenging issues in HIV chemotherapy. This article forms part of a special issue of Antiviral Research marking the 25th anniversary of antiretroviral drug discovery and development, Vol 85, issue 1, 2010.
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Affiliation(s)
- Luis Menéndez-Arias
- Centro de Biología Molecular Severo Ochoa (Consejo Superior de Investigaciones Científicas - Universidad Autónoma de Madrid), c/Nicolás Cabrera 1, Campus de Cantoblanco, 28049 Madrid, Spain.
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Sarafianos SG, Marchand B, Das K, Himmel DM, Parniak MA, Hughes SH, Arnold E. Structure and function of HIV-1 reverse transcriptase: molecular mechanisms of polymerization and inhibition. J Mol Biol 2008; 385:693-713. [PMID: 19022262 DOI: 10.1016/j.jmb.2008.10.071] [Citation(s) in RCA: 339] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2008] [Revised: 10/15/2008] [Accepted: 10/15/2008] [Indexed: 11/19/2022]
Abstract
The rapid replication of HIV-1 and the errors made during viral replication cause the virus to evolve rapidly in patients, making the problems of vaccine development and drug therapy particularly challenging. In the absence of an effective vaccine, drugs are the only useful treatment. Anti-HIV drugs work; so far drug therapy has saved more than three million years of life. Unfortunately, HIV-1 develops resistance to all of the available drugs. Although a number of useful anti-HIV drugs have been approved for use in patients, the problems associated with drug toxicity and the development of resistance means that the search for new drugs is an ongoing process. The three viral enzymes, reverse transcriptase (RT), integrase (IN), and protease (PR) are all good drug targets. Two distinct types of RT inhibitors, both of which block the polymerase activity of RT, have been approved to treat HIV-1 infections, nucleoside analogs (NRTIs) and nonnucleosides (NNRTIs), and there are promising leads for compounds that either block the RNase H activity or block the polymerase in other ways. A better understanding of the structure and function(s) of RT and of the mechanism(s) of inhibition can be used to generate better drugs; in particular, drugs that are effective against the current drug-resistant strains of HIV-1.
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Affiliation(s)
- Stefan G Sarafianos
- Christopher Bond Life Sciences Center, Department of Molecular Microbiology & Immunology, University of Missouri School of Medicine, Columbia, MO 65211, USA
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Kisic M, Mendieta J, Puertas MC, Parera M, Martínez MA, Martinez-Picado J, Menéndez-Arias L. Mechanistic basis of zidovudine hypersusceptibility and lamivudine resistance conferred by the deletion of codon 69 in the HIV-1 reverse transcriptase coding region. J Mol Biol 2008; 382:327-41. [PMID: 18662701 DOI: 10.1016/j.jmb.2008.07.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2008] [Revised: 07/10/2008] [Accepted: 07/14/2008] [Indexed: 10/21/2022]
Abstract
Deletions in the beta 3-beta 4 hairpin loop of human immunodeficiency virus type 1 reverse transcriptase (RT) are associated with the emergence of multidrug resistance. Common mutational patterns involve the deletion of Asp67 (Delta 67) and mutations such as K70R and T215F or T215Y, or the deletion of Thr69 (Delta 69) and mutations of the Q151M complex. Human immunodeficiency virus type 1 clones containing Delta 69 in a multidrug-resistant sequence background, including the Q151M complex and substitutions K103N, Y181C, M184V, and G190A, showed high-level resistance to all tested nucleoside RT inhibitors. In a multidrug-resistant sequence context, the deletion increases viral replication capacity. By itself, Delta 69 conferred increased susceptibility to beta-d-(+)-3'-azido-3'-deoxythymidine (AZT) and beta-l-(-)-2',3'-dideoxy-3'-thiacytidine resistance. Here, we use transient kinetics to show that, in a wild-type sequence background, Delta 69 does not affect the discrimination between AZT triphosphate and 2'-deoxythymidine 5'-triphosphate, but decreases the catalytic efficiency of the incorporation of beta-l-(-)-2',3'-dideoxy-3'-thiacytidine triphosphate relative to 2'-deoxycytidine 5'-triphosphate. In comparison with the wild-type RT, the Delta 69 mutant showed decreased ability to excise primers terminated with AZT monophosphate in the presence of ATP or pyrophosphate (PPi). These data support the role of the excision mechanism in mediating AZT hypersusceptibility. In addition, we demonstrate that the deletion has no effect on resistance to foscarnet (a PPi analogue) on phenotypic and nucleotide incorporation assays carried out with viral clones and recombinant enzymes, respectively. The results of molecular modeling studies suggest that the side chains of Lys65, Asp67, and Lys219 could play an important role in AZT hypersusceptibility mediated by Delta 69, whereas in the absence of Thr69, local structural rearrangements affecting the beta 3-beta 4 and beta 11a-beta 12 loops of the 66-kDa subunit of the RT could reduce the accessibility of the PPi donor to the terminating nucleotide at the 3' end of the primer.
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Affiliation(s)
- Mónica Kisic
- Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, 28049 Madrid, Spain
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HIV-1 reverse transcriptase inhibitor resistance mutations and fitness: a view from the clinic and ex vivo. Virus Res 2008; 134:104-23. [PMID: 18289713 DOI: 10.1016/j.virusres.2007.12.021] [Citation(s) in RCA: 112] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2007] [Revised: 12/27/2007] [Accepted: 12/28/2007] [Indexed: 01/04/2023]
Abstract
Genetic diversity plays a key role in human immunodeficiency virus (HIV) adaptation, providing a mechanism to escape host immune responses and develop resistance to antiretroviral drugs. This process is driven by the high-mutation rate during DNA synthesis by reverse transcriptase (RT), by the large viral populations, by rapid viral turnover, and by the high-recombination rate. Drugs targeting HIV RT are included in all regimens of highly active antiretroviral therapy (HAART), which helps to reduce the morbidity and mortality of HIV-infected patients. However, the emergence of resistant viruses is a significant obstacle to effective long-term management of HIV infection and AIDS. The increasing complexity of antiretroviral regimens has favored selection of HIV variants harboring multiple drug resistance mutations. Evolution of drug resistance is characterized by severe fitness losses when the drug is not present, which can be partially overcome by compensatory mutations or other adaptive changes that restore replication capacity. Here, we review the impact of mutations conferring resistance to nucleoside and nonnucleoside RT inhibitors on in vitro and in vivo fitness, their involvement in pathogenesis, persistence upon withdrawal of treatment, and transmission. We describe the techniques used to estimate viral fitness, the molecular mechanisms that help to improve the viral fitness of drug-resistant variants, and the clinical implications of viral fitness data, by exploring the potential relationship between plasma viral load, drug resistance, and disease progression.
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Menéndez-Arias L. Mechanisms of resistance to nucleoside analogue inhibitors of HIV-1 reverse transcriptase. Virus Res 2008; 134:124-46. [PMID: 18272247 DOI: 10.1016/j.virusres.2007.12.015] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2007] [Revised: 12/21/2007] [Accepted: 12/21/2007] [Indexed: 10/22/2022]
Abstract
Human immunodeficiency virus (HIV) reverse transcriptase (RT) inhibitors can be classified into nucleoside and nonnucleoside RT inhibitors. Nucleoside RT inhibitors are converted to active triphosphate analogues and incorporated into the DNA in RT-catalyzed reactions. They act as chain terminators blocking DNA synthesis, since they lack the 3'-OH group required for the phosphodiester bond formation. Unfortunately, available therapies do not completely suppress viral replication, and the emergence of drug-resistant HIV variants is facilitated by the high adaptation capacity of the virus. Mutations in the RT-coding region selected during treatment with nucleoside analogues confer resistance through different mechanisms: (i) altering discrimination between nucleoside RT inhibitors and natural substrates (dNTPs) (e.g. Q151M, M184V, etc.), or (ii) increasing the RT's phosphorolytic activity (e.g. M41L, T215Y and other thymidine analogue resistance mutations), which in the presence of a pyrophosphate donor (usually ATP) allow the removal of chain-terminating inhibitors from the 3' end of the primer. Both mechanisms are implicated in multi-drug resistance. The excision reaction can be modulated by mutations conferring resistance to nucleoside or nonnucleoside RT inhibitors, and by amino acid substitutions that interfere with the proper binding of the template-primer, including mutations that affect RNase H activity. New developments in the field should contribute towards improving the efficacy of current therapies.
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Affiliation(s)
- Luis Menéndez-Arias
- Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, c/Nicolás Cabrera, 1, Campus de Cantoblanco, 28049 Madrid, Spain.
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Domingo E, Escarmís C, Menéndez-Arias L, Perales C, Herrera M, Novella IS, Holland JJ. Viral Quasispecies: Dynamics, Interactions, and Pathogenesis *. ORIGIN AND EVOLUTION OF VIRUSES 2008. [PMCID: PMC7149507 DOI: 10.1016/b978-0-12-374153-0.00004-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Quasispecies theory is providing a solid, evolving conceptual framework for insights into virus population dynamics, adaptive potential, and response to lethal mutagenesis. The complexity of mutant spectra can influence disease progression and viral pathogenesis, as demonstrated using virus variants selected for increased replicative fidelity. Complementation and interference exerted among components of a viral quasispecies can either reinforce or limit the replicative capacity and disease potential of the ensemble. In particular, a progressive enrichment of a replicating mutant spectrum with interfering mutant genomes prompted by enhanced mutagenesis may be a key event in the sharp transition of virus populations into error catastrophe that leads to virus extinction. Fitness variations are influenced by the passage regimes to which viral populations are subjected, notably average fitness decreases upon repeated bottleneck events and fitness gains upon competitive optimization of large viral populations. Evolving viral quasispecies respond to selective constraints by replication of subpopulations of variant genomes that display higher fitness than the parental population in the presence of the selective constraint. This has been profusely documented with fitness effects of mutations associated with resistance of pathogenic viruses to antiviral agents. In particular, selection of HIV-1 mutants resistant to one or multiple antiretroviral inhibitors, and the compensatory effect of mutations in the same genome, offers a compendium of the molecular intricacies that a virus can exploit for its survival. This chapter reviews the basic principles of quasispecies dynamics as they can serve to explain the behavior of viruses.
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Matamoros T, Kim B, Menéndez-Arias L. Mechanistic insights into the role of Val75 of HIV-1 reverse transcriptase in misinsertion and mispair extension fidelity of DNA synthesis. J Mol Biol 2007; 375:1234-48. [PMID: 18155043 DOI: 10.1016/j.jmb.2007.11.021] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2007] [Revised: 11/06/2007] [Accepted: 11/07/2007] [Indexed: 10/22/2022]
Abstract
The side chain of Val75 stabilizes the fingers subdomain of the human immunodeficiency virus type 1 reverse transcriptase (RT), while its peptide backbone interacts with the single-stranded DNA template (at nucleotide +1) and with the peptide backbone of Gln151. Specific DNA polymerase activities of mutant RTs bearing amino acid substitutions at position 75 (i.e., V75A, V75F, V75I, V75L, V75M, V75S and V75T) were relatively high. Primer extension experiments carried out in the absence of one deoxyribonucleoside-triphosphate suggested that mutations did not affect the accuracy of the RT, except for V75A, V75F, V75I, and to a lesser extent V75T. The fidelity of RTs bearing mutations V75F and V75I increased 1.8- and 3-fold, respectively, as measured by the M13 lacZ alpha forward mutation assay, while V75A showed 1.4-fold decreased accuracy. Steady- and pre-steady-state kinetics demonstrated that the increased fidelity of V75I and V75F was related to their decreased ability to extend mismatched template-primers, while misincorporation efficiencies were not significantly affected by mutations. The increased mispair extension fidelity of mutant V75I RT could be attributed to the nucleotide affinity loss, observed in reactions with mismatched template-primers. Altogether, these data suggest that Val75 interactions with the 5' template overhang are important determinants of fidelity.
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Affiliation(s)
- Tania Matamoros
- Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, 28049 Madrid, Spain
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Eggink D, Huigen MCDG, Boucher CAB, Götte M, Nijhuis M. Insertions in the β3–β4 loop of reverse transcriptase of human immunodeficiency virus type 1 and their mechanism of action, influence on drug susceptibility and viral replication capacity. Antiviral Res 2007; 75:93-103. [PMID: 17416429 DOI: 10.1016/j.antiviral.2007.03.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2006] [Revised: 02/14/2007] [Accepted: 03/01/2007] [Indexed: 10/23/2022]
Abstract
Introduction of antiretroviral therapy combining protease and reverse transcriptase (RT) inhibitors has dramatically improved the quality of life and survival of patients infected with the human immunodeficiency virus (HIV). However, effective long-term therapy of HIV-infection has been severely hampered by the development of drug resistance. Resistance to antiretroviral drugs is generally conferred by specific amino acid substitutions in the target gene of the drug. Yet, occasionally gene insertions are being observed. The most commonly observed insertion is seen during substrate analogue RT inhibitor therapy and is selected in the beta3-beta4 loop of the RT enzyme. This flexible loop is located in the fingers subdomain of the enzyme and plays an important role in substrate binding. The acquisition of drug resistance related mutations or insertions might come at a price, which is reduced performance of the enzyme resulting in a diminished replication capacity of the virus. Various types of insertions have been described, and, in this review, we have summarized these data and discussed the mechanism of action of the RT inserts and their impact on both drug susceptibility and replication capacity.
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Affiliation(s)
- Dirk Eggink
- Department of Medical Microbiology, University Medical Center Utrecht, The Netherlands
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33
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Harrigan PR, Mo T, Hirsch J, Brumme ZL, McKenna P, Bacheler L. A 21-base pair insertion/duplication at codon 69 of the HIV type 1 reverse transcriptase in a patient undergoing multiple nucleoside therapy. AIDS Res Hum Retroviruses 2007; 23:895-9. [PMID: 17678473 DOI: 10.1089/aid.2006.0198] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
We describe the selection of a previously unreported 21-base pair insertion following codon 69 of the HIV-1 reverse transcriptase (RT) from a patient undergoing multiple nucleoside analogue therapy. This insertion was a direct duplication of the preceding 21 bases of HIV-RT, and was selected in a background of NRTI-resistance mutations including substitutions at RT codons 41, 67, 184, 210, and 215. Longitudinal genotypic and phenotypic resistance tests performed before and after selection of the insertion suggested that the insertion conferred an additional decrease in susceptibility to some nucleoside analogues, most notably didanosine, stavudine, abacavir, and tenofovir. However, phenotypic analysis of an insertion-containing site-directed mutant constructed in an HIV-1 HXB2 background revealed no direct association between the 21-base pair insertion and decreased susceptibility to NRTIs, suggesting that the insert requires the context of the patients' virus in order to confer resistance. These observations may offer new insight into the relative contribution of HIV-RT codon 69 insertion mutations to antiretroviral resistance.
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34
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Sluis-Cremer N. Molecular mechanisms of HIV-1 resistance to nucleoside and nucleotide reverse transcriptase inhibitors. ACTA ACUST UNITED AC 2007. [DOI: 10.2217/17469600.1.2.191] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The nucleoside and nucleotide reverse transcriptase inhibitors (NRTIs) were the first drugs used to treat HIV-1 infection and they remain integral components of nearly all antiretroviral regimens. However, the long-term efficacy of combination therapies that contain NRTIs is limited by the selection of drug-resistant variants of HIV-1. In general, NRTI therapy selects for viruses that have mutations in reverse transcriptase (RT). These mutations can be broadly categorized into two groups depending on their phenotypic mechanism of resistance. Mutations such as K65R, K70E, L74V, Q151M and M184V allow RT to discriminate against the NRTI triphosphate by increasing the enzyme’s selectivity for incorporation of the natural deoxynucleotide triphosphate substrate. By comparison, the thymidine analog mutations – such as M41L, D67N, K70R, L210W, T215F/Y and K219Q – augment the ability of HIV-1 RT to excise a chain-terminating NRTI monophosphate from a prematurely terminated DNA chain. A comprehensive knowledge of resistance mechanisms, cross-resistance patterns and interplay between mutations – as described in this review – can help optimize antiretroviral treatment strategies and possibly aid in the design of NRTIs that are active against drug-resistant HIV-1.
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Affiliation(s)
- Nicolas Sluis-Cremer
- University of Pittsburgh, School of Medicine, Division of Infectious Diseases, S817 Scaife Hall, 3550 Terrace Street, Pittsburgh, PA 15261, USA
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Huigen MCDG, de Graaf L, Eggink D, Schuurman R, Müller V, Stamp A, Stammers DK, Boucher CAB, Nijhuis M. Evolution of a novel 5-amino-acid insertion in the beta3-beta4 loop of HIV-1 reverse transcriptase. Virology 2007; 364:395-406. [PMID: 17451772 DOI: 10.1016/j.virol.2007.03.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2006] [Revised: 01/27/2007] [Accepted: 03/17/2007] [Indexed: 11/30/2022]
Abstract
HIV-1 isolates harbouring an insertion in the beta3-beta4 loop of reverse transcriptase (RT) confer high-level resistance to nucleoside analogues. We have identified a novel 5-amino-acid insertion (KGSNR amino acids 66-70) in a patient on prolonged nucleoside combination therapy (didanosine and stavudine) and investigated which factors were responsible for its outgrowth. Remarkably, only small fold increases in drug resistance to nucleoside analogues were observed compared to wild type. The insertion variant displayed a reduced replicative capacity in the absence of inhibitor, but had a slight replicative advantage in the presence of zidovudine, didanosine or stavudine, resulting in the selection and persistence of this insertion in vivo. Mathematical analyses of longitudinal samples indicated a 2% in vivo fitness advantage for the insertion variant compared to the initial viral population. The novel RT insertion variant conferring low levels of resistance was able to evolve towards a high-level resistant replication-competent variant.
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Affiliation(s)
- Marleen C D G Huigen
- Department of Medical Microbiology, University Medical Center Utrecht, Heidelberglaan 100, Utrecht, The Netherlands
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Villena C, Prado JG, Puertas MC, Martínez MA, Clotet B, Ruiz L, Parkin NT, Menéndez-Arias L, Martinez-Picado J. Relative fitness and replication capacity of a multinucleoside analogue-resistant clinical human immunodeficiency virus type 1 isolate with a deletion of codon 69 in the reverse transcriptase coding region. J Virol 2007; 81:4713-21. [PMID: 17314158 PMCID: PMC1900151 DOI: 10.1128/jvi.02135-06] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Deletions, insertions, and amino acid substitutions in the beta3-beta4 hairpin loop-coding region of human immunodeficiency virus type 1 (HIV-1) reverse transcriptase (RT) have been associated with resistance to nucleoside RT inhibitors when appearing in combination with other mutations in the RT-coding region. In this work, we have measured the in vivo fitness of HIV-1 variants containing a deletion of 3 nucleotides affecting codon 69 (Delta69) of the viral RT as well as the replication capacity (RC) ex vivo of a series of recombinant HIV-1 variants carrying an RT bearing the Delta69 deletion or the T69A mutation in a multidrug-resistant (MDR) sequence background, including the Q151M complex and substitutions M184V, K103N, Y181C, and G190A. Patient-derived viral clones having RTs with Delta69 together with S163I showed increased RCs under drug pressure. These data were consistent with the viral population dynamics observed in a long-term-treated HIV-1-infected patient. In the absence of drugs, viral clones containing T69A replicated more efficiently than those having Delta69, but only when patient-derived sequences corresponding to RT residues 248 to 527 were present. These effects could be attributed to a functional interaction between the C-terminal domain of the p66 subunit (RNase H domain) and the DNA polymerase domain of the RT. Finally, recombinant HIV-1 clones bearing RTs with MDR-associated mutations, including deletions at codon 69, showed increased susceptibilities to protease inhibitors in phenotypic assays. These effects correlated with impaired Gag cleavage and could be attributed to delayed maturation and decreased production of active protease in those variants.
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Affiliation(s)
- Cristina Villena
- irsiCaixa Foundation, Hospital Germans Trias i Pujol, Ctra. de Canyet s/n, 08916 Badalona, Spain
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37
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Cases-González CE, Franco S, Martínez MA, Menéndez-Arias L. Mutational patterns associated with the 69 insertion complex in multi-drug-resistant HIV-1 reverse transcriptase that confer increased excision activity and high-level resistance to zidovudine. J Mol Biol 2006; 365:298-309. [PMID: 17070543 DOI: 10.1016/j.jmb.2006.09.073] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2006] [Revised: 09/22/2006] [Accepted: 09/22/2006] [Indexed: 11/30/2022]
Abstract
Human immunodeficiency virus type 1 (HIV-1) strains having dipeptide insertions in the fingers subdomain and other drug resistance-related mutations scattered throughout their reverse transcriptase (RT)-coding region show high-level resistance to zidovudine (AZT) and other nucleoside analogues. Those phenotypic effects have been correlated with their increased ATP-dependent phosphorolytic activity on chain-terminated primers. Mutations T69S and T215Y and a dipeptide insertion (i.e. Ser-Ser) between positions 69 and 70 are required to achieve low-level resistance to thymidine analogues. However, additional amino acid substitutions are necessary to achieve the high-level phenotypic resistance to AZT shown by clinical HIV isolates carrying a dipeptide insertion in their RT-coding region. In order to identify those mutations that contribute to resistance in the sequence context of an insertion-containing RT derived from an HIV clinical isolate (designated as SS RT), we expressed and purified a series of chimeric enzymes containing portions of the wild-type or SS RT sequences. ATP-mediated excision activity measurements using AZT- and stavudine (d4T)-terminated primers and phenotypic assays showed that molecular determinants of high-level resistance to AZT were located in the fingers subdomain of the polymerase. Further studies, using recombinant RTs obtained by site-directed mutagenesis, revealed that M41L, A62V and in a lesser extent K70R, were the key mutations that together with T69S, T215Y and the dipeptide insertion conferred high levels of ATP-dependent phosphorolytic activity on AZT and d4T-terminated primers. Excision activity correlated well with AZT susceptibility measurements, and was consistent with phenotypic resistance to d4T. Structural analysis of the location of the implicated amino acid substitutions revealed a coordinated effect of M41L and A62V on the positioning of the beta3-beta4 hairpin loop, which plays a key role in the resistance mechanism.
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Affiliation(s)
- Clara E Cases-González
- Centro de Biología Molecular "Severo Ochoa", Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, 28049 Madrid, Spain
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Curr K, Tripathi S, Lennerstrand J, Larder BA, Prasad VR. Influence of naturally occurring insertions in the fingers subdomain of human immunodeficiency virus type 1 reverse transcriptase on polymerase fidelity and mutation frequencies in vitro. J Gen Virol 2006; 87:419-428. [PMID: 16432030 DOI: 10.1099/vir.0.81458-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The fingers subdomain of human immunodeficiency virus type 1 (HIV-1) reverse transcriptase (RT) is a hotspot for nucleoside analogue resistance mutations. Some multi-nucleoside analogue-resistant variants contain a T69S substitution along with dipeptide insertions between residues 69 and 70. This set of mutations usually co-exists with classic zidovudine-resistance mutations (e.g. M41L and T215Y) or an A62V mutation and confers resistance to multiple nucleoside analogue inhibitors. As insertions lie in the vicinity of the dNTP-binding pocket, their influence on RT fidelity was investigated. Commonly occurring insertion mutations were selected, i.e. T69S-AG, T69S-SG and T69S-SS alone, in combination with 3'-azido-2',3'-deoxythymidine-resistance mutations M41L, L210W, R211K, L214F, T215Y (LAG(AZ) and LSG(AZ)) or with an alternate set where A62V substitution replaces M41L (VAG(AZ), VSG(AZ) and VSS(AZ)). Using a lacZalpha gapped duplex substrate, the forward mutation frequencies of recombinant wild-type and mutant RTs bearing each of the above sets of mutations were measured. All of the mutants displayed significant decreases in mutation frequencies. Whereas the dipeptide insertions alone showed the least decrease (4.0- to 7.5-fold), the VAG series showed an intermediate reduction (5.0- to 11.4-fold) and the LAG set showed the largest reduction in mutation frequencies (15.3- and 16.3-fold for LAG(AZ) and LSG(AZ), respectively). Single dNTP exclusion assays for mutants LSG(AZ) and LAG(AZ) confirmed their large reduction in misincorporation efficiencies. The increased in vitro fidelity was not due to excision of the incorrect nucleotide via ATP-dependent removal. There was also no direct correlation between increased fidelity and template-primer affinity, suggesting a change in the active site that is conducive to better discrimination during dNTP insertion.
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Affiliation(s)
- Kenneth Curr
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
| | - Snehlata Tripathi
- Department of Biochemistry and Molecular Biology, UMDNJ - New Jersey Medical School, Newark, NJ 07103, USA
| | - Johan Lennerstrand
- Emory University School of Medicine, Veterans Affairs Medical Center, Decatur, GA 30033, USA
| | | | - Vinayaka R Prasad
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
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Boyer PL, Sarafianos SG, Clark PK, Arnold E, Hughes SH. Why do HIV-1 and HIV-2 use different pathways to develop AZT resistance? PLoS Pathog 2006; 2:e10. [PMID: 16485036 PMCID: PMC1364504 DOI: 10.1371/journal.ppat.0020010] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2005] [Accepted: 01/10/2006] [Indexed: 11/18/2022] Open
Abstract
The human immunodeficiency virus type 1 (HIV-1) develops resistance to all available drugs, including the nucleoside analog reverse transcriptase inhibitors (NRTIs) such as AZT. ATP-mediated excision underlies the most common form of HIV-1 resistance to AZT. However, clinical data suggest that when HIV-2 is challenged with AZT, it usually accumulates resistance mutations that cause AZT resistance by reduced incorporation of AZTTP rather than selective excision of AZTMP. We compared the properties of HIV-1 and HIV-2 reverse transcriptase (RT) in vitro. Although both RTs have similar levels of polymerase activity, HIV-1 RT more readily incorporates, and is more susceptible to, inhibition by AZTTP than is HIV-2 RT. Differences in the region around the polymerase active site could explain why HIV-2 RT incorporates AZTTP less efficiently than HIV-1 RT. HIV-1 RT is markedly more efficient at carrying out the excision reaction with ATP as the pyrophosphate donor than is HIV-2 RT. This suggests that HIV-1 RT has a better nascent ATP binding site than HIV-2 RT, making it easier for HIV-1 RT to develop a more effective ATP binding site by mutation. A comparison of HIV-1 and HIV-2 RT shows that there are numerous differences in the putative ATP binding sites that could explain why HIV-1 RT binds ATP more effectively. HIV-1 RT incorporates AZTTP more efficiently than does HIV-2 RT. However, HIV-1 RT is more efficient at ATP-mediated excision of AZTMP than is HIV-2 RT. Mutations in HIV-1 RT conferring AZT resistance tend to increase the efficiency of the ATP-mediated excision pathway, while mutations in HIV-2 RT conferring AZT resistance tend to increase the level of AZTTP exclusion from the polymerase active site. Thus, each RT usually chooses the pathway best suited to extend the properties of the respective wild-type enzymes.
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Affiliation(s)
- Paul L Boyer
- HIV Drug Resistance Program, NCI-Frederick, Frederick, Maryland, United States of America
| | - Stefan G Sarafianos
- Center for Advanced Biotechnology and Medicine and Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey, United States of America
| | - Patrick K Clark
- Basic Research Program, SAIC-Frederick, Inc., NCI-Frederick, Frederick, Maryland, United States of America
| | - Eddy Arnold
- Center for Advanced Biotechnology and Medicine and Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey, United States of America
| | - Stephen H Hughes
- HIV Drug Resistance Program, NCI-Frederick, Frederick, Maryland, United States of America
- * To whom correspondence should be addressed. E-mail:
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40
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Sabariegos R, Giménez-Barcons M, Tàpia N, Clotet B, Martínez MA. Sequence homology required by human immunodeficiency virus type 1 to escape from short interfering RNAs. J Virol 2006; 80:571-7. [PMID: 16378959 PMCID: PMC1346856 DOI: 10.1128/jvi.80.2.571-577.2006] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Short interfering RNAs (siRNAs) targeting viral or cellular genes can efficiently inhibit human immunodeficiency virus type 1 (HIV-1) replication. Nevertheless, the emergence of mutations in the gene being targeted could lead to the rapid escape from the siRNA. Here, we simulate viral escape by systematically introducing single-nucleotide substitutions in all 19 HIV-1 residues targeted by an effective siRNA. We found that all mutant viruses that were tested replicated better in the presence of the siRNA than in the presence of the wild-type virus. The antiviral activity of the siRNA was completely abolished by single substitutions in 10 (positions 4 to 11, 14, and 15) out of 16 positions tested (substitution at 3 of the 19 positions explored rendered nonviable viruses). With the exception of the substitution observed at position 12, substitutions at either the 5' end or the 3' end (positions 1 to 3, 16, and 18) were better tolerated by the RNA interference machinery and only in part affected siRNA inhibition. Our results show that optimal HIV-1 gene silencing by siRNA requires a complete homology within most of the target sequence and that substitutions at only a few positions at the 5' and 3' ends are partially tolerated.
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Affiliation(s)
- Rosario Sabariegos
- Fundació irsiCaixa, Laboratori de Retrovirologia, Hospital Universitari Germans Trias i Pujol, Ctra del Canyet s/n, 08916 Badalona, Spain
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41
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Winters MA, Merigan TC. Insertions in the human immunodeficiency virus type 1 protease and reverse transcriptase genes: clinical impact and molecular mechanisms. Antimicrob Agents Chemother 2005; 49:2575-82. [PMID: 15980322 PMCID: PMC1168704 DOI: 10.1128/aac.49.7.2575-2582.2005] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Mark A Winters
- Division of Infectious Diseases and Geographic Medicine, Stanford University, 300 Pasteur Drive, Room S-146, Stanford, California 94305-5107, USA.
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42
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Smith AJ, Meyer PR, Asthana D, Ashman MR, Scott WA. Intracellular substrates for the primer-unblocking reaction by human immunodeficiency virus type 1 reverse transcriptase: detection and quantitation in extracts from quiescent- and activated-lymphocyte subpopulations. Antimicrob Agents Chemother 2005; 49:1761-9. [PMID: 15855493 PMCID: PMC1087649 DOI: 10.1128/aac.49.5.1761-1769.2005] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Treatment of human immunodeficiency virus type 1 (HIV-1)-infected patients with 3'-azido-3'-deoxythymidine (AZT) selects for mutant forms of viral reverse transcriptase (RT) with increased ability to remove chain-terminating nucleotides from blocked DNA chains. We tested various cell extracts for the presence of endogenous acceptor substrates for this reaction. Cell extracts incubated with HIV-1 RT and [(32)P]ddAMP-terminated DNA primer/template gave rise to (32)P-labeled adenosine 2',3'-dideoxyadenosine 5',5'''-P(1),P(4)-tetraphosphate (Ap(4)ddA), ddATP, Gp(4)ddA, and Ap(3)ddA, corresponding to the transfer of [(32)P]ddAMP to ATP, PP(i), GTP, and ADP, respectively. Incubation with [(32)P]AZT monophosphate (AZTMP)-terminated primer/template gave rise to the analogous (32)P-labeled AZT derivatives. Based on the rates of formation of the specific excision products, ATP and PP(i) levels were determined: ATP was present at 1.3 to 2.2 mM in H9 cells, macrophages, and unstimulated CD4(+) or CD8(+) T cells, while PP(i) was present at 7 to 15 microM. Under these conditions, the ATP-dependent reaction predominated, and excision by the AZT-resistant mutant RT was more efficient than wild type RT. Activated CD4(+) or CD8(+) T cells contained 1.4 to 2.7 mM ATP and 55 to 79 microM PP(i). These cellular PP(i) concentrations are lower than previously reported; nonetheless, the PP(i)-dependent reaction predominated in extracts from activated T cells, and excision by mutant and wild-type RT occurred with similar efficiency. While PP(i)-dependent excision may contribute to AZT resistance in vivo, it is likely that selection of AZT-resistant mutants occurs primarily in an environment where the ATP-dependent reaction predominates.
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Affiliation(s)
- Anthony J Smith
- Department of Biochemistry and Molecular Biology, University of Miami School of Medicine, P.O. Box 016129, Miami, FL 33101-6129, USA
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43
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Matamoros T, Deval J, Guerreiro C, Mulard L, Canard B, Menéndez-Arias L. Suppression of multidrug-resistant HIV-1 reverse transcriptase primer unblocking activity by alpha-phosphate-modified thymidine analogues. J Mol Biol 2005; 349:451-63. [PMID: 15878178 DOI: 10.1016/j.jmb.2005.04.004] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2005] [Revised: 03/30/2005] [Accepted: 04/05/2005] [Indexed: 11/26/2022]
Abstract
A dipeptide insertion between codons 69 and 70 together with the amino acid substitution T215Y in the reverse transcriptase (RT)-coding region of human immunodeficiency virus type 1 (HIV-1) strains are known to confer phenotypic resistance to zidovudine (AZT) and stavudine (d4T). Phenotypic resistance correlates with an increased ATP-dependent phosphorolytic activity. Nucleoside alpha-boranophosphate diastereoisomers derived from AZT and d4T were tested as substrates of a multidrug-resistant HIV-1 RT (designated as SS RT) bearing a Ser-Ser insertion at codons 69-70 and other drug resistance-related mutations, in DNA polymerization assays and ATP-mediated excision reactions. Using pre-steady-state kinetics, we show that SS RT can incorporate both R(p) and S(p) diastereoisomers, although R(p) is the preferred isomer. Chirality at the internucleotidic linkage formed upon incorporation of nucleoside alpha-boranophosphate did not affect ATP-mediated excision. As reported for AZT and d4T-terminated primers, substituting Thr, Asn or Ser for Tyr215 abrogates the ATP-dependent phosphorolytic activity on primers terminated with alpha-boranophosphate derivatives of thymidine analogues. However, unlike in the case of AZT, eliminating the dipeptide insertion in SS RT had no effect on the ATP-mediated excision of primers terminated with alpha-boranophosphate derivatives of d4T. Studies with ATP analogues showed that exchanging a non-bridging oxygen atom at the gamma-phosphate group for sulfur causes a significant reduction of the ATP-dependent phosphorolytic activity of SS RT. Interestingly, SS RT's excision activity is completely eliminated upon phosphorothioate substitution at the 3' end of primers terminated with AZT. These results suggest that phosphorothioate derivatives of currently approved drugs could be useful against excision-proficient HIV-1 strains.
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Affiliation(s)
- Tania Matamoros
- Centro de Biología Molecular "Severo Ochoa", Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid, 28049 Madrid, Spain
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44
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van der Hoek L, Back N, Jebbink MF, de Ronde A, Bakker M, Jurriaans S, Reiss P, Parkin N, Berkhout B. Increased multinucleoside drug resistance and decreased replicative capacity of a human immunodeficiency virus type 1 variant with an 8-amino-Acid insert in the reverse transcriptase. J Virol 2005; 79:3536-43. [PMID: 15731248 PMCID: PMC1075723 DOI: 10.1128/jvi.79.6.3536-3543.2005] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Resistance to antiretroviral drugs is generally conferred by specific amino acid substitutions, rather than insertions or deletions, in reverse transcriptase (RT) of human immunodeficiency virus type 1 (HIV-1). The exception to these findings is the amino acid insertions found in the beta3-beta4 loop of the RT enzyme in response to treatment with nucleoside reverse transcriptase inhibitors. This insert consists most commonly of two amino acids, but we describe in detail the evolution of a variant with an 8-amino-acid (aa) insert in a patient treated with zidovudine (ZDV) and 2'-3'-dideoxycytidine (ddC). The 24-nucleotide insert is a partial duplication of local sequences but also contains a sequence segment of unknown origin. Extensive sequence analysis of longitudinal patient samples indicated that the HIV-1 population prior to the start of therapy contained not the wild-type amino acid 215T in RT but a mixture with 215D and 215C. Treatment with ZDV and subsequent ZDV-ddC combination therapy resulted in the evolution of an HIV-1 variant with a typical ZDV resistance genotype (41L, 44D, 67N, 69D, 210W, 215Y), which was slowly replaced by the insert-containing variant (41L, 44D, insert at position 69, 70R, 210W, 215Y). The latter variant demonstrated increased resistance to a wide range of drugs, indicating that the 8-aa insert augments nucleoside analogue resistance. The gain in drug resistance of the insert variant came at the expense of a reduction in replication capacity when assayed in the absence of drugs. We compared these data with the resistance and replication properties of 133 insert-containing sequences of different individuals present in the ViroLogic database and found that the size and actual sequence of the insert at position 69 influence the level of resistance to nucleoside analogues.
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Affiliation(s)
- Lia van der Hoek
- Department of Human Retrovirology, Academic Medical Center, University of Amsterdam, Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands
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45
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Substrate properties of dinucleoside 5?,5?-oligophosphates in the reactions catalyzed by HIV reverse transcriptase, E. coli DNA polymerase I, and E. coli RNA polymerase. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2005. [DOI: 10.1007/s11171-005-0006-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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46
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Götte M. Inhibition of HIV-1 reverse transcription: basic principles of drug action and resistance. Expert Rev Anti Infect Ther 2004; 2:707-16. [PMID: 15482234 DOI: 10.1586/14789072.2.5.707] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Nucleoside and non-nucleoside analog inhibitors of HIV Type 1 reverse transcriptase are currently used in the clinic to treat infection with this retrovirus. Following their intracellular activation, nucleoside analogs act as chain terminators, while non-nucleoside analog reverse transcriptase inhibitors bind to a hydrophobic pocket in close proximity to the active site and inhibit the catalytic step. Compounds that belong to the two different classes of drugs are frequently administered in combination to take advantage of the different mechanisms of drug action. However, the development of drug resistance may occur under conditions of continued, residual viral replication, which is a major cause of treatment failure. This review addresses the interaction between different inhibitors and resistance-conferring mutations in the context of combination therapy with drugs that target the reverse transcriptase enzyme. Focus is placed on biochemical mechanisms and the development of future approaches.
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Affiliation(s)
- Matthias Götte
- Jewish General Hospital, McGill University AIDS Center (226), Lady Davis Institute, 3755, chemin Côte-Ste-Catherine, Montréal, Québec, Canada H3T 1E2.
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47
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Boyer PL, Imamichi T, Sarafianos SG, Arnold E, Hughes SH. Effects of the Delta67 complex of mutations in human immunodeficiency virus type 1 reverse transcriptase on nucleoside analog excision. J Virol 2004; 78:9987-97. [PMID: 15331732 PMCID: PMC515022 DOI: 10.1128/jvi.78.18.9987-9997.2004] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Long-term use of combination therapy against human immunodeficiency virus type (HIV-1) provides strong selective pressure on the virus, and HIV-1 variants that are resistant to multiple inhibitors have been isolated. HIV-1 variants containing amino acid substitutions within the coding region of HIV-1 reverse transcriptase (RT), such as the 3'-azido-3'-deoxythymidine (AZT)-resistant variant AZT-R (M41L/D67N/K70R/T215Y/K219Q) and a variant containing an insertion in the fingers domain (S69SGR70/T215Y), are resistant to the nucleoside RT inhibitor (NRTI) AZT because of an increase in the level of excision of AZT monophosphate (AZTMP) from the primer. While rare, variants have also been isolated which contain deletions in the RT coding region. One such virus, described by Imamichi et al. (J. Virol 74:10958-10964, 2000; J. Virol. 74:1023-1028, 2000; J. Virol. 75:3988-3992, 2001), contains numerous amino acid substitutions and a deletion of codon 67, which we have designated the Delta67 complex of mutations. We have expressed and purified HIV-1 RT containing these mutations. We compared the polymerase and pyrophosphorolysis (excision) activity of an RT with the Delta67 complex of mutations to wild-type RT and the two other AZT-resistant variants described above. All of the AZT-resistant variants we tested excise AZTMP and 9-[2-(R)-(phosphonomethoxy)propyl]adenine (PMPA [tenofovir]) from the end of a primer more efficiently than wild-type RT. Although the variant RTs excised d4TMP less efficiently than AZTMP and PMPA, they were able to excise d4TMP more efficiently than wild-type RT. HIV-1 RT containing the Delta67 complex of mutations was not able to excise as broad a range of NRTIs as the fingers insertion variant SSGR/T215Y, but it was able to polymerize efficiently with low concentrations of deoxynucleoside triphosphates and seems to be able to excise AZTMP and PMPA at lower ATP concentrations than AZT-R or SSGR/T215Y, suggesting that a virus containing the Delta67 complex of mutations would replicate reasonably well in quiescent cells, even in the presence of AZT.
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Affiliation(s)
- Paul L Boyer
- HIV Drug Resistance Program, National Cancer Institute-FCRDC, P.O. Box B, Building 539, Room 130A, Frederick, MD 21702-1201, USA
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48
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Meyer PR, Smith AJ, Matsuura SE, Scott WA. Effects of primer-template sequence on ATP-dependent removal of chain-terminating nucleotide analogues by HIV-1 reverse transcriptase. J Biol Chem 2004; 279:45389-98. [PMID: 15308646 DOI: 10.1074/jbc.m405072200] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
HIV-1 reverse transcriptase can remove chain terminators from blocked DNA ends through a nucleotide-dependent mechanism. We show that the catalytic efficiency of the removal reaction can vary several hundred-fold in different sequence contexts and is most strongly affected by the nature of the base pair at the 3'-primer terminus and the six base pairs upstream of it. Similar effects of the upstream sequence were observed with primer-templates terminated with 2',3'-dideoxy-AMP, 2',3'-dideoxy-CMP, or 2',3'-dideoxy-GMP. However, the removal of 2',3'-dideoxy-TMP or 3'-azido-2',3'-dideoxy-TMP was much less influenced by upstream primer-template sequence, and the rate of excision of these thymidylate analogues was greater than or equal to that of the other chain-terminating residues in each sequence context tested. These results strongly indicate that the primer terminus and adjacent upstream base pairs interact with reverse transcriptase in a sequence-dependent manner that affects the removal reaction. We conclude that primer-template sequence context is a major factor to consider when evaluating the removal of different chain terminators by HIV-1 reverse transcriptase.
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Affiliation(s)
- Peter R Meyer
- Department of Biochemistry and Molecular Biology, University of Miami School of Medicine, Miami, Florida 33136-1015, USA
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49
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Prado JG, Franco S, Matamoros T, Ruiz L, Clotet B, Menéndez-Arias L, Martínez MA, Martinez-Picado J. Relative replication fitness of multi-nucleoside analogue-resistant HIV-1 strains bearing a dipeptide insertion in the fingers subdomain of the reverse transcriptase and mutations at codons 67 and 215. Virology 2004; 326:103-12. [PMID: 15262499 DOI: 10.1016/j.virol.2004.06.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2004] [Accepted: 06/03/2004] [Indexed: 10/26/2022]
Abstract
A two-serine insertion at position 69 (i69SS) of human immunodeficiency virus type 1 (HIV-1) reverse transcriptase (RT) appears to be critical to enhance multi-nucleoside RT inhibitor resistance (MNR) in the sequence context of multiple zidovudine (AZT) resistance mutations (i.e., M41L, L210W, T215Y). In this study, we measured the replication capacity relative to the wild-type (WT) HIV-1 of a series of recombinant viruses carrying the i69SS in the background of a clinical isolate with MNR in which we introduced mutations D67N, Y215T, Y215S, or Y215N. In vitro measurements included replication kinetics and growth competition assays at different multiplicities of infection (MOI). While the addition of D67N had a minor effect on replication capacity, the reversion of Tyr-215 to Thr, Ser, or Asn was sufficient to increase the virus ability to replicate in a drug-free environment. The same genotypic changes at position 215 rendered the MNR virus susceptible to AZT and stavudine. Interestingly, the presence of the insertion together with mutation T215Y in an otherwise WT sequence background was not sufficient to confer high-level resistance to AZT, although its replication capacity was clearly impaired. Therefore, the RT residue 215 plays a critical role in both replication capacity and drug resistance of multidrug-resistant viruses containing the i69SS.
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Affiliation(s)
- Julia G Prado
- IrsiCaixa Foundation, Hospital Germans Trias i Pujol, Universitat Autònoma de Barcelona, Badalona, Spain
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50
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Boyer PL, Stenbak CR, Clark PK, Linial ML, Hughes SH. Characterization of the polymerase and RNase H activities of human foamy virus reverse transcriptase. J Virol 2004; 78:6112-21. [PMID: 15163704 PMCID: PMC416499 DOI: 10.1128/jvi.78.12.6112-6121.2004] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Foamy virus (FV) replication, while related to that of orthoretroviruses, differs at a number of steps. Several of these differences involve the reverse transcriptase (RT). There appear to be fewer RTs present in FV than in orthoretroviruses; we previously proposed that the polymerase of FV RT was more active than orthoretroviral RTs to compensate for the numerical difference. Here we present further characterization of the RT of FV. The polymerase activity of FV RT was greater than that of human immunodeficiency virus type 1 RT in a variety of assays. We also examined the RNase H activity of FV RT, and we propose that FV RT has a basic loop in the RNase H domain. Although the sequence of the basic loop of FV RT is different from the basic loop of either Moloney leukemia virus RNase H or Escherichia coli RNase H, the FV RT basic loop appears to have a similar function.
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Affiliation(s)
- Paul L Boyer
- HIV Drug Resistance Program, National Cancer Institute-FCRDC, P.O. Box B, Building 539, Room 130A, Frederick, MD 21702-1201, USA
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