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Li Y, Wu M, Fu Y, Xue J, Yuan F, Qu T, Rissanou AN, Wang Y, Li X, Hu H. Therapeutic stapled peptides: Efficacy and molecular targets. Pharmacol Res 2024; 203:107137. [PMID: 38522761 DOI: 10.1016/j.phrs.2024.107137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 03/06/2024] [Accepted: 03/06/2024] [Indexed: 03/26/2024]
Abstract
Peptide stapling, by employing a stable, preformed alpha-helical conformation, results in the production of peptides with improved membrane permeability and enhanced proteolytic stability, compared to the original peptides, and provides an effective solution to accelerate the rapid development of peptide drugs. Various reviews present peptide stapling chemistries, anchoring residues and one- or two-component cyclization, however, therapeutic stapled peptides have not been systematically summarized, especially focusing on various disease-related targets. This review highlights the latest advances in therapeutic peptide drug development facilitated by the application of stapling technology, including different stapling techniques, synthetic accessibility, applicability to biological targets, potential for solving biological problems, as well as the current status of development. Stapled peptides as therapeutic drug candidates have been classified and analysed mainly by receptor- and ligand-based stapled peptide design against various diseases, including cancer, infectious diseases, inflammation, and diabetes. This review is expected to provide a comprehensive reference for the rational design of stapled peptides for different diseases and targets to facilitate the development of therapeutic peptides with enhanced pharmacokinetic and biological properties.
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Affiliation(s)
- Yulei Li
- School of Pharmaceutical Sciences & Institute of Materia Medica, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, Shandong 250117, China.
| | - Minghao Wu
- School of Medicine, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Yinxue Fu
- School of Pharmaceutical Sciences & Institute of Materia Medica, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, Shandong 250117, China
| | - Jingwen Xue
- School of Pharmaceutical Sciences & Institute of Materia Medica, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, Shandong 250117, China
| | - Fei Yuan
- School of Pharmaceutical Sciences & Institute of Materia Medica, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, Shandong 250117, China
| | - Tianci Qu
- School of Pharmaceutical Sciences & Institute of Materia Medica, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, Shandong 250117, China
| | - Anastassia N Rissanou
- Theoretical & Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 11635, Greece
| | - Yilin Wang
- Department of Hepatic Surgery, Fudan University Shanghai Cancer Center, Department of Oncology, Shanghai Medical College, Fudan University, 131 Dong'an Road, Shanghai 200032, China
| | - Xiang Li
- School of Pharmacy, Second Military Medical University, 325 Guohe Road, Shanghai, 200433, China.
| | - Honggang Hu
- School of Medicine, Shanghai University, 99 Shangda Road, Shanghai 200444, China.
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Dwivedi R, Prakash P, Kumbhar BV, Balasubramaniam M, Dash C. HIV-1 capsid and viral DNA integration. mBio 2024; 15:e0021222. [PMID: 38085100 PMCID: PMC10790781 DOI: 10.1128/mbio.00212-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2024] Open
Abstract
IMPORTANCE HIV-1 capsid protein (CA)-independently or by recruiting host factors-mediates several key steps of virus replication in the cytoplasm and nucleus of the target cell. Research in the recent years have established that CA is multifunctional and genetically fragile of all the HIV-1 proteins. Accordingly, CA has emerged as a validated and high priority therapeutic target, and the first CA-targeting antiviral drug was recently approved for treating multi-drug resistant HIV-1 infection. However, development of next generation CA inhibitors depends on a better understanding of CA's known roles, as well as probing of CA's novel roles, in HIV-1 replication. In this timely review, we present an updated overview of the current state of our understanding of CA's multifunctional role in HIV-1 replication-with a special emphasis on CA's newfound post-nuclear roles, highlight the pressing knowledge gaps, and discuss directions for future research.
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Affiliation(s)
- Richa Dwivedi
- The Center for AIDS Health Disparities Research, Meharry Medical College, Nashville, Tennessee, USA
- Department of Microbiology, Immunology, and Physiology, Meharry Medical College, Nashville, Tennessee, USA
| | - Prem Prakash
- The Center for AIDS Health Disparities Research, Meharry Medical College, Nashville, Tennessee, USA
- Department of Biochemistry, Cancer Biology, Neuroscience and Pharmacology, Meharry Medical College, Nashville, Tennessee, USA
| | - Bajarang Vasant Kumbhar
- Department of Biological Sciences, Sunandan Divatia School of Science, NMIMS (Deemed to be) University, Mumbai, Maharashtra, India
| | - Muthukumar Balasubramaniam
- The Center for AIDS Health Disparities Research, Meharry Medical College, Nashville, Tennessee, USA
- Department of Biochemistry, Cancer Biology, Neuroscience and Pharmacology, Meharry Medical College, Nashville, Tennessee, USA
| | - Chandravanu Dash
- The Center for AIDS Health Disparities Research, Meharry Medical College, Nashville, Tennessee, USA
- Department of Microbiology, Immunology, and Physiology, Meharry Medical College, Nashville, Tennessee, USA
- Department of Biochemistry, Cancer Biology, Neuroscience and Pharmacology, Meharry Medical College, Nashville, Tennessee, USA
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Thenin-Houssier S, Machida S, Jahan C, Bonnet-Madin L, Abbou S, Chen HC, Tesfaye R, Cuvier O, Benkirane M. POLE3 is a repressor of unintegrated HIV-1 DNA required for efficient virus integration and escape from innate immune sensing. SCIENCE ADVANCES 2023; 9:eadh3642. [PMID: 37922361 PMCID: PMC10624344 DOI: 10.1126/sciadv.adh3642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 10/03/2023] [Indexed: 11/05/2023]
Abstract
Unintegrated retroviral DNA is transcriptionally silenced by host chromatin silencing factors. Here, we used the proteomics of isolated chromatin segments method to reveal viral and host factors associated with unintegrated HIV-1DNA involved in its silencing. By gene silencing using siRNAs, 46 factors were identified as potential repressors of unintegrated HIV-1DNA. Knockdown and knockout experiments revealed POLE3 as a transcriptional repressor of unintegrated HIV-1DNA. POLE3 maintains unintegrated HIV-1DNA in a repressive chromatin state, preventing RNAPII recruitment to the viral promoter. POLE3 and the recently identified host factors mediating unintegrated HIV-1 DNA silencing, CAF1 and SMC5/SMC6/SLF2, show specificity toward different forms of unintegrated HIV-1DNA. Loss of POLE3 impaired HIV-1 replication, suggesting that repression of unintegrated HIV-1DNA is important for optimal viral replication. POLE3 depletion reduces the integration efficiency of HIV-1. POLE3, by maintaining a repressive chromatin structure of unintegrated HIV-1DNA, ensures HIV-1 escape from innate immune sensing in primary CD4+ T cells.
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Affiliation(s)
- Suzie Thenin-Houssier
- Institut de Génétique Humaine. Laboratoire de Virologie Moléculaire, CNRS Université de Montpellier. Montpellier. France
| | - Shinichi Machida
- Institut de Génétique Humaine. Laboratoire de Virologie Moléculaire, CNRS Université de Montpellier. Montpellier. France
- Department of Structural Virology, National Center for Global Health and Medicine, 1-21-1 Toyama, Shinjuku-ku, Tokyo 162-8655, Japan
| | - Cyprien Jahan
- Institut de Génétique Humaine. Laboratoire de Virologie Moléculaire, CNRS Université de Montpellier. Montpellier. France
| | - Lucie Bonnet-Madin
- Institut de Génétique Humaine. Laboratoire de Virologie Moléculaire, CNRS Université de Montpellier. Montpellier. France
| | - Scarlette Abbou
- Institut de Génétique Humaine. Laboratoire de Virologie Moléculaire, CNRS Université de Montpellier. Montpellier. France
| | - Heng-Chang Chen
- Institut de Génétique Humaine. Laboratoire de Virologie Moléculaire, CNRS Université de Montpellier. Montpellier. France
| | - Robel Tesfaye
- Laboratory of Chromatin Dynamics, Centre de Biologie Intégrative (CBI), MCD Unit (UMR5077), Université de Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - Olivier Cuvier
- Laboratory of Chromatin Dynamics, Centre de Biologie Intégrative (CBI), MCD Unit (UMR5077), Université de Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - Monsef Benkirane
- Institut de Génétique Humaine. Laboratoire de Virologie Moléculaire, CNRS Université de Montpellier. Montpellier. France
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Chameettachal A, Mustafa F, Rizvi TA. Understanding Retroviral Life Cycle and its Genomic RNA Packaging. J Mol Biol 2023; 435:167924. [PMID: 36535429 DOI: 10.1016/j.jmb.2022.167924] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 12/12/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022]
Abstract
Members of the family Retroviridae are important animal and human pathogens. Being obligate parasites, their replication involves a series of steps during which the virus hijacks the cellular machinery. Additionally, many of the steps of retrovirus replication are unique among viruses, including reverse transcription, integration, and specific packaging of their genomic RNA (gRNA) as a dimer. Progress in retrovirology has helped identify several molecular mechanisms involved in each of these steps, but many are still unknown or remain controversial. This review summarizes our present understanding of the molecular mechanisms involved in various stages of retrovirus replication. Furthermore, it provides a comprehensive analysis of our current understanding of how different retroviruses package their gRNA into the assembling virions. RNA packaging in retroviruses holds a special interest because of the uniqueness of packaging a dimeric genome. Dimerization and packaging are highly regulated and interlinked events, critical for the virus to decide whether its unspliced RNA will be packaged as a "genome" or translated into proteins. Finally, some of the outstanding areas of exploration in the field of RNA packaging are highlighted, such as the role of epitranscriptomics, heterogeneity of transcript start sites, and the necessity of functional polyA sequences. An in-depth knowledge of mechanisms that interplay between viral and cellular factors during virus replication is critical in understanding not only the virus life cycle, but also its pathogenesis, and development of new antiretroviral compounds, vaccines, as well as retroviral-based vectors for human gene therapy.
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Affiliation(s)
- Akhil Chameettachal
- Department of Microbiology & Immunology, College of Medicine and Health Sciences (CMHS), United Arab Emirates University, Al Ain, United Arab Emirates. https://twitter.com/chameettachal
| | - Farah Mustafa
- Department of Biochemistry, College of Medicine and Health Sciences (CMHS), United Arab Emirates University, Al Ain, United Arab Emirates; Zayed bin Sultan Center for Health Sciences (ZCHS), United Arab Emirates University, Al Ain, United Arab Emirates.
| | - Tahir A Rizvi
- Department of Microbiology & Immunology, College of Medicine and Health Sciences (CMHS), United Arab Emirates University, Al Ain, United Arab Emirates; Zayed bin Sultan Center for Health Sciences (ZCHS), United Arab Emirates University, Al Ain, United Arab Emirates.
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Abstract
A hallmark of retroviral replication is establishment of the proviral state, wherein a DNA copy of the viral RNA genome is stably incorporated into a host cell chromosome. Integrase is the viral enzyme responsible for the catalytic steps involved in this process, and integrase strand transfer inhibitors are widely used to treat people living with HIV. Over the past decade, a series of X-ray crystallography and cryogenic electron microscopy studies have revealed the structural basis of retroviral DNA integration. A variable number of integrase molecules congregate on viral DNA ends to assemble a conserved intasome core machine that facilitates integration. The structures additionally informed on the modes of integrase inhibitor action and the means by which HIV acquires drug resistance. Recent years have witnessed the development of allosteric integrase inhibitors, a highly promising class of small molecules that antagonize viral morphogenesis. In this Review, we explore recent insights into the organization and mechanism of the retroviral integration machinery and highlight open questions as well as new directions in the field.
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Blanco-Rodriguez G, Di Nunzio F. The Viral Capsid: A Master Key to Access the Host Nucleus. Viruses 2021; 13:v13061178. [PMID: 34203080 PMCID: PMC8234750 DOI: 10.3390/v13061178] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2021] [Revised: 06/02/2021] [Accepted: 06/16/2021] [Indexed: 12/15/2022] Open
Abstract
Viruses are pathogens that have evolved to hijack the cellular machinery to replicate themselves and spread to new cells. During the course of evolution, viruses developed different strategies to overcome the cellular defenses and create new progeny. Among them, some RNA and many DNA viruses require access to the nucleus to replicate their genome. In non-dividing cells, viruses can only access the nucleus through the nuclear pore complex (NPC). Therefore, viruses have developed strategies to usurp the nuclear transport machinery and gain access to the nucleus. The majority of these viruses use the capsid to manipulate the nuclear import machinery. However, the particular tactics employed by each virus to reach the host chromatin compartment are very different. Nevertheless, they all require some degree of capsid remodeling. Recent notions on the interplay between the viral capsid and cellular factors shine new light on the quest for the nuclear entry step and for the fate of these viruses. In this review, we describe the main components and function of nuclear transport machinery. Next, we discuss selected examples of RNA and DNA viruses (HBV, HSV, adenovirus, and HIV) that remodel their capsid as part of their strategies to access the nucleus and to replicate.
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Affiliation(s)
- Guillermo Blanco-Rodriguez
- Advanced Molecular Virology and Retroviral Dynamics Group, Department of Virology, Pasteur Institute, 75015 Paris, France;
- Immunity and Cancer Department, Curie Institute, PSL Research University, INSERM U932, 75005 Paris, France
| | - Francesca Di Nunzio
- Advanced Molecular Virology and Retroviral Dynamics Group, Department of Virology, Pasteur Institute, 75015 Paris, France;
- Correspondence:
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Scoca V, Di Nunzio F. The HIV-1 Capsid: From Structural Component to Key Factor for Host Nuclear Invasion. Viruses 2021; 13:273. [PMID: 33578999 PMCID: PMC7916756 DOI: 10.3390/v13020273] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 01/29/2021] [Accepted: 02/05/2021] [Indexed: 02/07/2023] Open
Abstract
Since the discovery of HIV-1, the viral capsid has been recognized to have an important role as a structural protein that holds the viral genome, together with viral proteins essential for viral life cycle, such as the reverse transcriptase (RT) and the integrase (IN). The reverse transcription process takes place between the cytoplasm and the nucleus of the host cell, thus the Reverse Transcription Complexes (RTCs)/Pre-integration Complexes (PICs) are hosted in intact or partial cores. Early biochemical assays failed to identify the viral CA associated to the RTC/PIC, possibly due to the stringent detergent conditions used to fractionate the cells or to isolate the viral complexes. More recently, it has been observed that some host partners of capsid, such as Nup153 and CPSF6, can only bind multimeric CA proteins organized in hexamers. Those host factors are mainly located in the nuclear compartment, suggesting the entrance of the viral CA as multimeric structure inside the nucleus. Recent data show CA complexes within the nucleus having a different morphology from the cytoplasmic ones, clearly highlighting the remodeling of the viral cores during nuclear translocation. Thus, the multimeric CA complexes lead the viral genome into the host nuclear compartment, piloting the intranuclear journey of HIV-1 in order to successfully replicate. The aim of this review is to discuss and analyze the main discoveries to date that uncover the viral capsid as a key player in the reverse transcription and PIC maturation until the viral DNA integration into the host genome.
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Affiliation(s)
- Viviana Scoca
- Advanced Molecular Virology and Retroviral Dynamics Group, Department of Virology Pasteur Institute, 75015 Paris, France;
- BioSPC Doctoral School, Universitè de Paris, 75015 Paris, France
| | - Francesca Di Nunzio
- Advanced Molecular Virology and Retroviral Dynamics Group, Department of Virology Pasteur Institute, 75015 Paris, France;
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Ramdas P, Sahu AK, Mishra T, Bhardwaj V, Chande A. From Entry to Egress: Strategic Exploitation of the Cellular Processes by HIV-1. Front Microbiol 2020; 11:559792. [PMID: 33343516 PMCID: PMC7746852 DOI: 10.3389/fmicb.2020.559792] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Accepted: 11/05/2020] [Indexed: 01/23/2023] Open
Abstract
HIV-1 employs a rich arsenal of viral factors throughout its life cycle and co-opts intracellular trafficking pathways. This exquisitely coordinated process requires precise manipulation of the host microenvironment, most often within defined subcellular compartments. The virus capitalizes on the host by modulating cell-surface proteins and cleverly exploiting nuclear import pathways for post entry events, among other key processes. Successful virus–cell interactions are indeed crucial in determining the extent of infection. By evolving defenses against host restriction factors, while simultaneously exploiting host dependency factors, the life cycle of HIV-1 presents a fascinating montage of an ongoing host–virus arms race. Herein, we provide an overview of how HIV-1 exploits native functions of the host cell and discuss recent findings that fundamentally change our understanding of the post-entry replication events.
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Affiliation(s)
- Pavitra Ramdas
- Molecular Virology Laboratory, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal, India
| | - Amit Kumar Sahu
- Molecular Virology Laboratory, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal, India
| | - Tarun Mishra
- Molecular Virology Laboratory, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal, India
| | - Vipin Bhardwaj
- Molecular Virology Laboratory, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal, India
| | - Ajit Chande
- Molecular Virology Laboratory, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal, India
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Chen M, Xu K, Li B, Wang N, Zhang Q, Chen L, Zhang D, Yang L, Xu Z, Xu H. HMGA1 Regulates the Stem Cell-Like Properties of Circulating Tumor Cells from GIST Patients via Wnt/β-Catenin Pathway. Onco Targets Ther 2020; 13:4943-4956. [PMID: 32606726 PMCID: PMC7296980 DOI: 10.2147/ott.s249063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Accepted: 04/06/2020] [Indexed: 12/21/2022] Open
Abstract
Background Gastrointestinal stromal tumor (GIST) is the most common sarcoma of the digestive system. Circulating tumor cells (CTCs) have been proven to be critical in the recurrence and metastasis of diseases; however, the characteristics of CTCs of GIST are still unclear. Methods We sorted out and verified the validity of CTCs from peripheral blood of gastrointestinal stromal tumor (GIST) patients with or without heterochronous liver metastasis using flow cytometry (FCM). Differential genes were analyzed between the GIST patients with and without liver metastasis using next-generation sequencing (NGS). Results The preliminary study on the characteristics of CTCs revealed that CTCs of GIST patients with heterochronous liver metastasis had stronger stem cell-like properties (SC-like properties) than CTCs of those without liver metastasis. Furthermore, NGS followed with a series of assays revealed that HMGA1 played a critical role in regulating the SC-like properties of CTCs. Mechanistically, HMGA1 could activate Wnt/β-catenin pathway in vitro and vivo. Moreover, we found that the expression level of HMGA1 in CTCs was an independent risk factor probably influencing the prognosis of GIST patients. Conclusion Our findings indicate the significant role of HMGA1 in SC-like properties, IM resistance and eventually hepatic metastasis formation of CTCs. Targeting HMGA1 in CTCs may be a therapeutic strategy for GIST patients with hepatic metastasis.
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Affiliation(s)
- Ming Chen
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, People's Republic of China.,Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Jiangsu Collaborative Innovation Center for Cancer Personalized Medical University, Nanjing, Jiangsu 211166, People's Republic of China
| | - Kangjing Xu
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, People's Republic of China.,Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Jiangsu Collaborative Innovation Center for Cancer Personalized Medical University, Nanjing, Jiangsu 211166, People's Republic of China
| | - Bowen Li
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, People's Republic of China.,Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Jiangsu Collaborative Innovation Center for Cancer Personalized Medical University, Nanjing, Jiangsu 211166, People's Republic of China
| | - Nuofan Wang
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, People's Republic of China.,Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Jiangsu Collaborative Innovation Center for Cancer Personalized Medical University, Nanjing, Jiangsu 211166, People's Republic of China
| | - Qiang Zhang
- Department of Gastrointestinal Surgery, The Second People's Hospital of Lianyungang, Lianyungang, Jiangsu 222000, People's Republic of China
| | - Liang Chen
- Department of General Surgery, Jiangsu Cancer Hospital, Jiangsu Institute of Cancer Research, The Affiliated Cancer Hospital of Nanjing Medical University, Nanjing, Jiangsu 210009, People's Republic of China
| | - Diancai Zhang
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, People's Republic of China.,Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Jiangsu Collaborative Innovation Center for Cancer Personalized Medical University, Nanjing, Jiangsu 211166, People's Republic of China
| | - Li Yang
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, People's Republic of China.,Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Jiangsu Collaborative Innovation Center for Cancer Personalized Medical University, Nanjing, Jiangsu 211166, People's Republic of China
| | - Zekuan Xu
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, People's Republic of China.,Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Jiangsu Collaborative Innovation Center for Cancer Personalized Medical University, Nanjing, Jiangsu 211166, People's Republic of China
| | - Hao Xu
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, People's Republic of China.,Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Jiangsu Collaborative Innovation Center for Cancer Personalized Medical University, Nanjing, Jiangsu 211166, People's Republic of China
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High Mobility Group A (HMGA): Chromatin Nodes Controlled by a Knotty miRNA Network. Int J Mol Sci 2020; 21:ijms21030717. [PMID: 31979076 PMCID: PMC7038092 DOI: 10.3390/ijms21030717] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 01/16/2020] [Accepted: 01/17/2020] [Indexed: 12/11/2022] Open
Abstract
High mobility group A (HMGA) proteins are oncofoetal chromatin architectural factors that are widely involved in regulating gene expression. These proteins are unique, because they are highly expressed in embryonic and cancer cells, where they play a relevant role in cell proliferation, stemness, and the acquisition of aggressive tumour traits, i.e., motility, invasiveness, and metastatic properties. The HMGA protein expression levels and activities are controlled by a connected set of events at the transcriptional, post-transcriptional, and post-translational levels. In fact, microRNA (miRNA)-mediated RNA stability is the most-studied mechanism of HMGA protein expression modulation. In this review, we contribute to a comprehensive overview of HMGA-targeting miRNAs; we provide detailed information regarding HMGA gene structural organization and a comprehensive evaluation and description of HMGA-targeting miRNAs, while focusing on those that are widely involved in HMGA regulation; and, we aim to offer insights into HMGA-miRNA mutual cross-talk from a functional and cancer-related perspective, highlighting possible clinical implications.
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11
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The mutation of Transportin 3 gene that causes limb girdle muscular dystrophy 1F induces protection against HIV-1 infection. PLoS Pathog 2019; 15:e1007958. [PMID: 31465518 PMCID: PMC6715175 DOI: 10.1371/journal.ppat.1007958] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 07/03/2019] [Indexed: 01/10/2023] Open
Abstract
The causative mutation responsible for limb girdle muscular dystrophy 1F (LGMD1F) is one heterozygous single nucleotide deletion in the stop codon of the nuclear import factor Transportin 3 gene (TNPO3). This mutation causes a carboxy-terminal extension of 15 amino acids, producing a protein of unknown function (TNPO3_mut) that is co-expressed with wild-type TNPO3 (TNPO3_wt). TNPO3 has been involved in the nuclear transport of serine/arginine-rich proteins such as splicing factors and also in HIV-1 infection through interaction with the viral integrase and capsid. We analyzed the effect of TNPO3_mut on HIV-1 infection using PBMCs from patients with LGMD1F infected ex vivo. HIV-1 infection was drastically impaired in these cells and viral integration was reduced 16-fold. No significant effects on viral reverse transcription and episomal 2-LTR circles were observed suggesting that the integration of HIV-1 genome was restricted. This is the second genetic defect described after CCR5Δ32 that shows strong resistance against HIV-1 infection.
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12
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Yadav P, Sur S, Desai D, Kulkarni S, Sharma V, Tandon V. Interaction of HIV-1 integrase with polypyrimidine tract binding protein and associated splicing factor (PSF) and its impact on HIV-1 replication. Retrovirology 2019; 16:12. [PMID: 31036027 PMCID: PMC6489298 DOI: 10.1186/s12977-019-0474-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Accepted: 04/11/2019] [Indexed: 12/17/2022] Open
Abstract
Background The different interactions between viral proteins and cellular host proteins are required for efficient replication of HIV-1. Various reports implicated host cellular proteins as a key factor that either interact directly with HIV-1 integrase (IN) or get involved in the integration process of virus resulting in the modulation of integration step. Polypyrimidine tract binding protein and associated splicing factor (PSF) has diverse functions inside the cell such as transcriptional regulation, DNA repair, acts as nucleic acids binding protein and regulate replication and infectivity of different viruses. Results The protein binding study identified the association of host protein PSF with HIV-1 integrase. The siRNA knockdown (KD) of PSF resulted in increased viral replication in TZM-bl cells, suggesting PSF has negative influence on viral replication. The quantitative PCR of virus infected PSF knockdown TZM-bl cells showed more integrated DNA and viral cDNA as compared to control cells. We did not observe any significant difference between the amount of early reverse transcription products as well as infectivity of virus in the PSF KD and control TZM-bl cells. Molecular docking study supported the argument that PSF hinders the binding of viral DNA with IN. Conclusion In an attempt to study the host interacting protein of IN, we have identified a new interacting host protein PSF which is a splicing factor and elucidated its role in integration and viral replication. Experimental as well as in silico analysis inferred that the host protein causes not only change in the integration events but also targets the incoming viral DNA or the integrase-viral DNA complex. The role of PSF was also investigated at early reverse transcript production as well as late stages. The PSF is causing changes in integration events, but it does not over all make any changes in the virus infectivity. MD trajectory analyses provided a strong clue of destabilization of Integrase-viral DNA complex occurred due to PSF interaction with the conserved bases of viral DNA ends that are extremely crucial contact points with integrase and indispensable for integration. Thus our study emphasizes the negative influence of PSF on HIV-1 replication. Electronic supplementary material The online version of this article (10.1186/s12977-019-0474-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Pooja Yadav
- Department of Chemistry, University of Delhi, Delhi, 110007, India
| | - Souvik Sur
- Special Center for Molecular Medicine, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Dipen Desai
- National AIDS Research Institute, Pune, Maharashtra, 411026, India
| | - Smita Kulkarni
- National AIDS Research Institute, Pune, Maharashtra, 411026, India
| | - Vartika Sharma
- International Centre for Genetics Engineering and Biotechnology, New Delhi, 110067, India
| | - Vibha Tandon
- Special Center for Molecular Medicine, Jawaharlal Nehru University, New Delhi, 110067, India.
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13
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Ciubotaru M, Musat MG, Surleac M, Ionita E, Petrescu AJ, Abele E, Abele R. The Design of New HIV-IN Tethered Bifunctional Inhibitors Using Multiple Microdomain Targeted Docking. Curr Med Chem 2018; 26:2574-2600. [PMID: 29623824 DOI: 10.2174/0929867325666180406114405] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 03/16/2018] [Accepted: 03/16/2018] [Indexed: 12/17/2022]
Abstract
Currently, used antiretroviral HIV therapy drugs exclusively target critical groups in the enzymes essential for the viral life cycle. Increased mutagenesis of their genes changes these viral enzymes, which once mutated can evade therapeutic targeting, effects which confer drug resistance. To circumvent this, our review addresses a strategy to design and derive HIV-Integrase (HIV-IN) inhibitors which simultaneously target two IN functional domains, rendering it inactive even if the enzyme accumulates many mutations. First we review the enzymatic role of IN to insert the copied viral DNA into a chromosome of the host T lymphocyte, highlighting its main functional and structural features to be subjected to inhibitory action. From a functional and structural perspective we present all classes of HIV-IN inhibitors with their most representative candidates. For each chosen compound we also explain its mechanism of IN inhibition. We use the recently resolved cryo EM IN tetramer intasome DNA complex onto which we dock various reference IN inhibitory chemical scaffolds such as to target adjacent functional IN domains. Pairing compounds with complementary activity, which dock in the vicinity of a IN structural microdomain, we design bifunctional new drugs which may not only be more resilient to IN mutations but also may be more potent inhibitors than their original counterparts. In the end of our review we propose synthesis pathways to link such paired compounds with enhanced synergistic IN inhibitory effects.
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Affiliation(s)
- Mihai Ciubotaru
- Department of Immunology, Colentina Clinical Hospital Research Center, Bucharest, Romania.,Department of Life and Environmental Physics, National Institute for Physics and Nuclear Engineering Horia Hulubei, Bucharest-Magurele, Romania
| | - Mihaela Georgiana Musat
- Department of Immunology, Colentina Clinical Hospital Research Center, Bucharest, Romania.,Department of Biochemistry, Faculty of Pharmacy, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania
| | - Marius Surleac
- Department of Bio-informatics and Structural Biochemistry, Institute of Biochemistry of the Romanian Academy, Bucharest, Romania
| | - Elena Ionita
- Department of Immunology, Colentina Clinical Hospital Research Center, Bucharest, Romania.,Department of Life and Environmental Physics, National Institute for Physics and Nuclear Engineering Horia Hulubei, Bucharest-Magurele, Romania
| | - Andrei Jose Petrescu
- Department of Bio-informatics and Structural Biochemistry, Institute of Biochemistry of the Romanian Academy, Bucharest, Romania
| | - Edgars Abele
- Modern Catalysis Method Mihai Ciubotaru group, Latvian Institute of Organic Synthesis, Riga, Latvia
| | - Ramona Abele
- Modern Catalysis Method Mihai Ciubotaru group, Latvian Institute of Organic Synthesis, Riga, Latvia
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14
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Wang R, Zhang X, Ding H, Qiao Y, Han X, Geng W, Guan G, Cui H, Zhao B, Wu Y, Liang G, Shang H. AID recruits the RNA exosome to degrade HIV-1 nascent transcripts through interaction with the Tat-P-TEFb-TAR RNP complex. FEBS Lett 2018; 592:284-294. [PMID: 29266200 DOI: 10.1002/1873-3468.12954] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 10/31/2017] [Accepted: 11/17/2017] [Indexed: 01/11/2023]
Abstract
Activation-induced cytidine deaminase (AID), a member of the APOBEC family that induces antibody diversification, has been shown to inhibit the replication of hepatitis B virus, Kaposi's sarcoma-associated herpesvirus, and retro-transposons. However, whether AID can inhibit human immunodeficiency virus 1 (HIV-1) replication remains unclear. Here, we report that AID impairs the synthesis of HIV-1 components by interacting with the complex of Tat. This interaction recruits the RNA exosome to degrade the nascent HIV-1 transcript. AID also targets the HIV-1-integrated genome via the Tat-P-TEFb-TAR complex. Thus, we propose a novel function for AID as an adaptor protein that represses viral transcription. Our findings provide insights into developing anti-HIV therapeutics and understanding how host cells restrict integrated virus replication.
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Affiliation(s)
- Ruixuan Wang
- Key Laboratory of AIDS Immunology of the National Health and Family Planning Commission, Department of Laboratory Medicine, China Medical University, Shenyang, China
| | - Xiaowei Zhang
- The Core Laboratory for Public Health Science and Practice, China Medical University, Shenyang, China
| | - Haibo Ding
- Key Laboratory of AIDS Immunology of the National Health and Family Planning Commission, Department of Laboratory Medicine, China Medical University, Shenyang, China
| | - Ying Qiao
- The Core Laboratory for Public Health Science and Practice, China Medical University, Shenyang, China
| | - Xiaoxu Han
- Key Laboratory of AIDS Immunology of the National Health and Family Planning Commission, Department of Laboratory Medicine, China Medical University, Shenyang, China
| | - Wenqing Geng
- Key Laboratory of AIDS Immunology of the National Health and Family Planning Commission, Department of Laboratory Medicine, China Medical University, Shenyang, China
| | - Gefei Guan
- Department of Neurosurgery, The First Affiliated Hospital, China Medical University, Shenyang, China
| | - Hualu Cui
- Key Laboratory of AIDS Immunology of the National Health and Family Planning Commission, Department of Laboratory Medicine, China Medical University, Shenyang, China
| | - Bin Zhao
- Key Laboratory of AIDS Immunology of the National Health and Family Planning Commission, Department of Laboratory Medicine, China Medical University, Shenyang, China
| | - Yuntao Wu
- National Center for Biodefense and Infectious Diseases, Department of Molecular and Microbiology, George Mason University, Manassas, VA, USA
| | - Guoxin Liang
- Key Laboratory of AIDS Immunology of the National Health and Family Planning Commission, Department of Laboratory Medicine, China Medical University, Shenyang, China
| | - Hong Shang
- Key Laboratory of AIDS Immunology of the National Health and Family Planning Commission, Department of Laboratory Medicine, China Medical University, Shenyang, China
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15
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Hurwitz JL, Jones BG, Charpentier E, Woodland DL. Hypothesis: RNA and DNA Viral Sequence Integration into the Mammalian Host Genome Supports Long-Term B Cell and T Cell Adaptive Immunity. Viral Immunol 2017; 30:628-632. [PMID: 29028182 DOI: 10.1089/vim.2017.0099] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Viral sequence integration into the mammalian genome has long been perceived as a health risk. In some cases, integration translates to chronic viral infection, and in other instances, oncogenic gene mutations occur. However, research also shows that animal cells can benefit from integrated viral sequences (e.g., to support host cell development or to silence foreign invaders). Here we propose that, comparable with the clustered regularly interspaced short palindromic repeats that provide bacteria with adaptive immunity against invasive bacteriophages, animal cells may co-opt integrated viral sequences to support immune memory. We hypothesize that host cells express viral peptides from open reading frames in integrated sequences to boost adaptive B cell and T cell responses long after replicating viruses are cleared. In support of this hypothesis, we examine previous literature describing (1) viruses that infect acutely (e.g., vaccinia viruses and orthomyxoviruses) followed by unexplained, long-term persistence of viral nucleotide sequences, viral peptides, and virus-specific adaptive immunity, (2) the high frequency of endogenous viral genetic elements found in animal genomes, and (3) mechanisms with which animal host machinery supports foreign sequence integration.
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Affiliation(s)
- Julia L Hurwitz
- 1 Department of Infectious Diseases, St. Jude Children's Research Hospital , Memphis, Tennessee.,2 Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center , Memphis, Tennessee
| | - Bart G Jones
- 1 Department of Infectious Diseases, St. Jude Children's Research Hospital , Memphis, Tennessee
| | - Emmanuelle Charpentier
- 3 Max Planck Institute for Infection Biology , Berlin, Germany .,4 Humboldt University , Berlin, Germany .,5 The Laboratory for Molecular Infection Medicine Sweden (MIMS), Department of Molecular Biology, Umeå Centre for Microbial Research (UCMR), Umeå University , Umeå, Sweden
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16
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George A, Raghavendra NK. L368F/V408F double mutant of IBD of LEDGF/p75 retains interaction with M178I mutant of HIV-1 integrase. Biochem Biophys Res Commun 2017; 490:271-275. [DOI: 10.1016/j.bbrc.2017.06.035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 06/09/2017] [Indexed: 01/15/2023]
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17
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Sumter TF, Xian L, Huso T, Koo M, Chang YT, Almasri TN, Chia L, Inglis C, Reid D, Resar LMS. The High Mobility Group A1 (HMGA1) Transcriptome in Cancer and Development. Curr Mol Med 2016; 16:353-93. [PMID: 26980699 DOI: 10.2174/1566524016666160316152147] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 02/15/2016] [Accepted: 03/10/2016] [Indexed: 01/19/2023]
Abstract
BACKGROUND & OBJECTIVES Chromatin structure is the single most important feature that distinguishes a cancer cell from a normal cell histologically. Chromatin remodeling proteins regulate chromatin structure and high mobility group A (HMGA1) proteins are among the most abundant, nonhistone chromatin remodeling proteins found in cancer cells. These proteins include HMGA1a/HMGA1b isoforms, which result from alternatively spliced mRNA. The HMGA1 gene is overexpressed in cancer and high levels portend a poor prognosis in diverse tumors. HMGA1 is also highly expressed during embryogenesis and postnatally in adult stem cells. Overexpression of HMGA1 drives neoplastic transformation in cultured cells, while inhibiting HMGA1 blocks oncogenic and cancer stem cell properties. Hmga1 transgenic mice succumb to aggressive tumors, demonstrating that dysregulated expression of HMGA1 causes cancer in vivo. HMGA1 is also required for reprogramming somatic cells into induced pluripotent stem cells. HMGA1 proteins function as ancillary transcription factors that bend chromatin and recruit other transcription factors to DNA. They induce oncogenic transformation by activating or repressing specific genes involved in this process and an HMGA1 "transcriptome" is emerging. Although prior studies reveal potent oncogenic properties of HMGA1, we are only beginning to understand the molecular mechanisms through which HMGA1 functions. In this review, we summarize the list of putative downstream transcriptional targets regulated by HMGA1. We also briefly discuss studies linking HMGA1 to Alzheimer's disease and type-2 diabetes. CONCLUSION Further elucidation of HMGA1 function should lead to novel therapeutic strategies for cancer and possibly for other diseases associated with aberrant HMGA1 expression.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - L M S Resar
- Department of Medicine, Faculty of the Johns Hopkins University School of Medicine, 720 Rutland Avenue, Ross Research Building, Room 1025, Baltimore, MD 21205-2109, USA.
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18
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Abstract
To complete its life cycle, HIV-1 enters the nucleus of the host cell as reverse-transcribed viral DNA. The nucleus is a complex environment, in which chromatin is organized to support different structural and functional aspects of cell physiology. As such, it represents a challenge for an incoming viral genome, which needs to be integrated into cellular DNA to ensure productive infection. Integration of the viral genome into host DNA depends on the enzymatic activity of HIV-1 integrase and involves different cellular factors that influence the selection of integration sites. The selection of integration site has functional consequences for viral transcription, which usually follows the integration event. However, in resting CD4+ T cells, the viral genome can be silenced for long periods of time, which leads to the generation of a latent reservoir of quiescent integrated HIV-1 DNA. Integration represents the only nuclear event in the viral life cycle that can be pharmacologically targeted with current therapies, and the aspects that connect HIV-1 nuclear entry to HIV-1 integration and viral transcription are only beginning to be elucidated.
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19
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Yang D, Liao R, Zheng Y, Sun L, Xu T. Analysis of PBase Binding Profile Indicates an Insertion Target Selection Mechanism Dependent on TTAA, But Not Transcriptional Activity. Int J Biol Sci 2016; 12:1074-82. [PMID: 27570481 PMCID: PMC4997051 DOI: 10.7150/ijbs.15589] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2016] [Accepted: 05/15/2016] [Indexed: 12/20/2022] Open
Abstract
Transposons and retroviruses are important pathogenic agents and tools for mutagenesis and transgenesis. Insertion target selection is a key feature for a given transposon or retrovirus. The piggyBac (PB) transposon is highly active in mice and human cells, which has a much better genome-wide distribution compared to the retrovirus and P-element. However, the underlying reason is not clear. Utilizing a tagged functional PB transposase (PBase), we were able to conduct genome-wide profiling for PBase binding sites in the mouse genome. We have shown that PBase binding mainly depends on the distribution of the tetranucleotide TTAA, which is not affected by the presence of PB DNA. Furthermore, PBase binding is negatively influenced by the methylation of CG sites in the genome. Analysis of a large collection of PB insertions in mice has revealed an insertion profile similar to the PBase binding profile. Interestingly, this profile is not correlated with transcriptional active genes in the genome or transcriptionally active regions within a transcriptional unit. This differs from what has been previously shown for P-element and retroviruses insertions. Our study provides an explanation for PB's genome-wide insertion distribution and also suggests that PB target selection relies on a new mechanism independent of active transcription and open chromatin structure.
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Affiliation(s)
- Dong Yang
- 1. State Key Laboratory of Genetic Engineering and National Center for International Research of Development and Disease, Fudan-Yale Center for Biomedical Research, Innovation Center for International Cooperation of Genetics and Development, Institute of Developmental Biology and Molecular Medicine, School of Life Sciences, Fudan University, Shanghai 200433; 2. Howard Hughes Medical Institute, Department of Genetics, Yale University School of Medicine, New Haven, CT 06536
| | - Ruiqi Liao
- 1. State Key Laboratory of Genetic Engineering and National Center for International Research of Development and Disease, Fudan-Yale Center for Biomedical Research, Innovation Center for International Cooperation of Genetics and Development, Institute of Developmental Biology and Molecular Medicine, School of Life Sciences, Fudan University, Shanghai 200433
| | - Yun Zheng
- 3. Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, Yunnan 650500, China
| | - Ling Sun
- 1. State Key Laboratory of Genetic Engineering and National Center for International Research of Development and Disease, Fudan-Yale Center for Biomedical Research, Innovation Center for International Cooperation of Genetics and Development, Institute of Developmental Biology and Molecular Medicine, School of Life Sciences, Fudan University, Shanghai 200433
| | - Tian Xu
- 1. State Key Laboratory of Genetic Engineering and National Center for International Research of Development and Disease, Fudan-Yale Center for Biomedical Research, Innovation Center for International Cooperation of Genetics and Development, Institute of Developmental Biology and Molecular Medicine, School of Life Sciences, Fudan University, Shanghai 200433; 2. Howard Hughes Medical Institute, Department of Genetics, Yale University School of Medicine, New Haven, CT 06536
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20
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Li M, Tucker LD, Asara JM, Cheruiyot CK, Lu H, Wu ZJ, Newstein MC, Dooner MS, Friedman J, Lally MA, Ramratnam B. Stem-loop binding protein is a multifaceted cellular regulator of HIV-1 replication. J Clin Invest 2016; 126:3117-29. [PMID: 27454292 PMCID: PMC4966322 DOI: 10.1172/jci82360] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Accepted: 05/26/2016] [Indexed: 01/12/2023] Open
Abstract
A rare subset of HIV-1-infected individuals is able to maintain plasma viral load (VL) at low levels without antiretroviral treatment. Identifying the mechanisms underlying this atypical response to infection may lead to therapeutic advances for treating HIV-1. Here, we developed a proteomic analysis to compare peripheral blood cell proteomes in 20 HIV-1-infected individuals who maintained either high or low VL with the aim of identifying host factors that impact HIV-1 replication. We determined that the levels of multiple histone proteins were markedly decreased in cohorts of individuals with high VL. This reduction was correlated with lower levels of stem-loop binding protein (SLBP), which is known to control histone metabolism. Depletion of cellular SLBP increased promoter engagement with the chromatin structures of the host gene high mobility group protein A1 (HMGA1) and viral long terminal repeat (LTR), which led to higher levels of HIV-1 genomic integration and proviral transcription. Further, we determined that TNF-α regulates expression of SLBP and observed that plasma TNF-α levels in HIV-1-infected individuals correlated directly with VL levels and inversely with cellular SLBP levels. Our findings identify SLBP as a potentially important cellular regulator of HIV-1, thereby establishing a link between histone metabolism, inflammation, and HIV-1 infection.
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Affiliation(s)
- Ming Li
- Laboratory of Retrovirology, Division of Infectious Diseases, Department of Medicine, Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
- Division of Infectious Diseases, Department of Medicine, The Miriam Hospital and Rhode Island Hospital, Providence, Rhode Island, USA
| | - Lynne D. Tucker
- Laboratory of Retrovirology, Division of Infectious Diseases, Department of Medicine, Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
- Division of Infectious Diseases, Department of Medicine, The Miriam Hospital and Rhode Island Hospital, Providence, Rhode Island, USA
| | - John M. Asara
- Division of Signal Transduction, Beth Israel Deaconess Medical Center and Department of Medicine, and Harvard Medical School, Boston, Massachusetts, USA
| | - Collins K. Cheruiyot
- Laboratory of Retrovirology, Division of Infectious Diseases, Department of Medicine, Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
- Division of Infectious Diseases, Department of Medicine, The Miriam Hospital and Rhode Island Hospital, Providence, Rhode Island, USA
| | - Huafei Lu
- Laboratory of Retrovirology, Division of Infectious Diseases, Department of Medicine, Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
- Division of Infectious Diseases, Department of Medicine, The Miriam Hospital and Rhode Island Hospital, Providence, Rhode Island, USA
| | - Zhijin J. Wu
- Department of Biostatistics, Brown University, Providence, Rhode Island, USA
| | - Michael C. Newstein
- Department of Medicine, Milford Regional Medical Center, and University of Massachusetts Medical School, Milford, Massachusetts, USA
| | - Mark S. Dooner
- Division of Hematology and Oncology, Department of Medicine, Rhode Island Hospital, and Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
| | - Jennifer Friedman
- Center for International Health Research, Rhode Island Hospital, Providence, Rhode Island, USA
- Department of Pediatrics, Rhode Island Hospital, and Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
| | - Michelle A. Lally
- Division of Infectious Diseases, Department of Medicine, The Miriam Hospital and Rhode Island Hospital, Providence, Rhode Island, USA
- Providence Veterans Affairs Medical Center, Providence, Rhode Island, USA
- Lifespan/Tufts/Brown Center for AIDS Research, Providence, Rhode Island, USA
| | - Bharat Ramratnam
- Laboratory of Retrovirology, Division of Infectious Diseases, Department of Medicine, Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
- Division of Infectious Diseases, Department of Medicine, The Miriam Hospital and Rhode Island Hospital, Providence, Rhode Island, USA
- Lifespan/Tufts/Brown Center for AIDS Research, Providence, Rhode Island, USA
- COBRE Center for Cancer Research, Rhode Island Hospital, and Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
- Clinical Research Center of Lifespan, Providence, Rhode Island, USA
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21
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Akhter MZ, Rajeswari MR. Triplex forming oligonucleotides targeted to hmga1 selectively inhibit its expression and induce apoptosis in human cervical cancer. J Biomol Struct Dyn 2016; 35:689-703. [PMID: 26923360 DOI: 10.1080/07391102.2016.1160257] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
High-mobility group A1 (HMGA1) is a non-histone chromosomal protein, which is known as 'architectural' transcription factor that facilitates the assembly of 'enhanceosome.' Because of its elevated expression in a number of human malignancies, with barely minimal levels in healthy adults, HMGA1 is considered as potential 'tumor marker.' Therefore, we looked at the inhibition of hmga1 using anti-gene strategy, as an attractive therapeutic approach. This was achieved by two triplex forming oligonucleotides (TFOs), TFO1 and TFO2 targeted to the promoter of hmga1 at positions, -284--304 and -2800--2826, respectively. The stability of two DNA triplexes was characterized using a variety of biophysical and thermodynamics techniques and was confirmed by gel retardation assay using γ-32P [ATP]. The efficacy of TFOs on HMGA1 expression was evaluated in HeLa cells using MTT assay, Flow cytometry, Western blot, and RT-PCR. Results revealed that DNA Triplex1 formed by TFO1 is more stable and stronger than the corresponding Triplex2. Although both TFOs downregulated hmga1 expression at mRNA and protein levels and caused apoptotic cell death in HeLa cell line, TFO1 demonstrated a greater effect at low concentration which corroborates well with the stability data. Thus, TFO-mediated inhibition of hmga1 expression can be a promising strategy for the development of novel anti-cancer therapeutics.
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Affiliation(s)
- Md Zahid Akhter
- a Department of Biochemistry , All India Institute of Medical Sciences , New Delhi - 110029 , India
| | - Moganty R Rajeswari
- a Department of Biochemistry , All India Institute of Medical Sciences , New Delhi - 110029 , India
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22
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Abstract
In a mature, infectious HIV-1 virion, the viral genome is housed within a conical capsid core made from the viral capsid (CA) protein. The CA protein and the structure into which it assembles facilitate virtually every step of infection through a series of interactions with multiple host cell factors. This Review describes our understanding of the interactions between the viral capsid core and several cellular factors that enable efficient HIV-1 genome replication, timely core disassembly, nuclear import and the integration of the viral genome into the genome of the target cell. We then discuss how elucidating these interactions can reveal new targets for therapeutic interactions against HIV-1.
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23
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Akhter MZ, Luthra K, Rajeswari MR. Molecular aspects on adriamycin interaction with hmga1 regulatory region and its inhibitory effect on HMGA1 expression in human cervical cancer. J Biomol Struct Dyn 2015; 34:877-91. [PMID: 26084422 DOI: 10.1080/07391102.2015.1057617] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
High mobility group A1 (HMGA1), a non-histone chromosomal protein, is highly expressed in a wide range of human cancers including cervical, breast, and prostate cancers. Therefore, hmga1 gene is considered as an attractive potential target for anticancer drugs. We have chosen 27 bp DNA sequence from a regulatory region of hmga1 promoter and studied its interaction with adriamycin (ADM) and in vitro expression of HMGA1 in the presence of ADM in HeLa cell line. A variety of biophysical techniques were employed to understand the characteristics of [DNA-ADM] complex. Spectrophotometric titration data, DNA denaturation profiles, and quenching of fluorescence of ADM in the presence of DNA demonstrated a strong complexation between DNA and ADM with a high binding affinity (Ka) of 1.3 × 10(6) M(-1) and a stoichiometry of 1:3 (drug:nucleotide). The energetics of binding obtained from isothermal titration calorimetry and differential scanning calorimetry suggest the binding to be exothermic and enthalpy (∆H, -6.7 ± 2.4 kcal M(-1)) and entropy (TΔS, 18.5 ± 6.4 kcal M(-1)) driven (20°C), which is typical of intercalative mode of binding. Further, results on decreased expression (by ~70%) of HMGA1 both at mRNA and protein levels in association with the observed cell death (by ~75%) in HeLa cell line, clearly confirm that ADM does target hmga1; however, the effect of ADM on genes other than hmga1 either directly or via hmga1-mediated pathways cannot be ruled out in the observed cytotoxicity. Therefore, hmga1 in general and particularly the regulatory region is a promising target for therapeutic strategy in combating cancer.
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Affiliation(s)
- Md Zahid Akhter
- a Department of Biochemistry , All India Institute of Medical Sciences , New Delhi 110029 , India
| | - Kalpana Luthra
- a Department of Biochemistry , All India Institute of Medical Sciences , New Delhi 110029 , India
| | - Moganty R Rajeswari
- a Department of Biochemistry , All India Institute of Medical Sciences , New Delhi 110029 , India
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24
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Craigie R, Bushman FD. Host Factors in Retroviral Integration and the Selection of Integration Target Sites. Microbiol Spectr 2014; 2:10.1128/microbiolspec.MDNA3-0026-2014. [PMID: 26104434 PMCID: PMC4525071 DOI: 10.1128/microbiolspec.mdna3-0026-2014] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Indexed: 02/07/2023] Open
Abstract
In order to replicate, a retrovirus must integrate a DNA copy of the viral RNA genome into a chromosome of the host cell. The study of retroviral integration has advanced considerably in the past few years. Here we focus on host factor interactions and the linked area of integration targeting. Genome-wide screens for cellular factors affecting HIV replication have identified a series of host cell proteins that may mediate subcellular trafficking for preintegration complexes, nuclear import, and integration target site selection. The cell transcriptional co-activator protein LEDGF/p75 has been identified as a tethering factor important for HIV integration, and recently, BET proteins (Brd2, 4, and 4) have been identified as tethering factors for the gammaretroviruses. A new class of HIV inhibitors has been developed targeting the HIV-1 IN-LEDGF binding site, though surprisingly these inhibitors appear to block assembly late during replication and do not act at the integration step. Going forward, genome-wide studies of HIV-host interactions offer many new starting points to investigate HIV replication and identify potential new inhibitor targets.
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Affiliation(s)
- Robert Craigie
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0560
| | - Frederic D. Bushman
- Department of Microbiology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
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25
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Sangeetha B, Muthukumaran R, Amutha R. The dynamics of interconverting D- and E-forms of the HIV-1 integrase N-terminal domain. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2014; 43:485-98. [DOI: 10.1007/s00249-014-0979-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 06/23/2014] [Accepted: 07/21/2014] [Indexed: 12/19/2022]
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26
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Tan BH, Suzuki Y, Takahashi H, Ying PHR, Takahashi C, Han Q, Chin WX, Chao SH, Sawasaki T, Yamamoto N, Suzuki Y. Identification of RFPL3 protein as a novel E3 ubiquitin ligase modulating the integration activity of human immunodeficiency virus, type 1 preintegration complex using a microtiter plate-based assay. J Biol Chem 2014; 289:26368-26382. [PMID: 25107902 DOI: 10.1074/jbc.m114.561662] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Integration, one of the hallmarks of retrovirus replication, is mediated by a nucleoprotein complex called the preintegration complex (PIC), in which viral DNA is associated with many protein components that are required for completion of the early phase of infection. A striking feature of the PIC is its powerful integration activity in vitro. The PICs from a freshly isolated cytoplasmic extract of infected cells are able to insert viral DNA into exogenously added target DNA in vitro. Therefore, a PIC-based in vitro assay is a reliable system for assessing protein factors influencing retroviral integration. In this study, we applied a microtiter plate-based in vitro assay to a screening study using a protein library that was produced by the wheat germ cell-free protein synthesis system. Using a library of human E3 ubiquitin ligases, we identified RFPL3 as a potential stimulator of human immunodeficiency virus, type 1 (HIV-1) PIC integration activity in vitro. This enhancement of PIC activity by RFPL3 was likely to be attributed to its N-terminal RING domain. To further understand the functional role of RFPL3 in HIV infection, we created a human cell line overexpressing RFPL3. Immunoprecipitation analysis revealed that RFPL3 was associated with the human immunodeficiency virus, type 1 PICs in infected cells. More importantly, single-round HIV-1 infection was enhanced significantly by RFPL3 expression. Our proteomic approach displays an advantage in the identification of new cellular proteins affecting the integration activity of the PIC and, therefore, contributes to the understanding of functional interaction between retroviral integration complexes and host factors.
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Affiliation(s)
- Beng Hui Tan
- Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, #15-02, Singapore 117599, Singapore
| | - Yasutsugu Suzuki
- Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, #15-02, Singapore 117599, Singapore
| | - Hirotaka Takahashi
- Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, #15-02, Singapore 117599, Singapore
| | - Pamela Ho Rui Ying
- Veterinary Bioscience, Life Sciences and Chemical Technology, Ngee Ann Polytechnic, 535 Clementi Road, Singapore 599489, Singapore
| | - Chikako Takahashi
- Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, #15-02, Singapore 117599, Singapore
| | - Qi'En Han
- Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, #15-02, Singapore 117599, Singapore
| | - Wei Xin Chin
- Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, #15-02, Singapore 117599, Singapore
| | - Sheng-Hao Chao
- Expression Engineering Group, Bioprocessing Technology Institute, Agency for Science, Technology and Research (A*STAR), 20 Biopolis Way, #06-01 Centros, Singapore 138668, Singapore
| | - Tatsuya Sawasaki
- Proteo-Science Center, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan, and
| | - Naoki Yamamoto
- Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, #15-02, Singapore 117599, Singapore,.
| | - Youichi Suzuki
- Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, #15-02, Singapore 117599, Singapore,; Program in Emerging Infectious Diseases, Duke-NUS Graduate Medical School, 8 College Road, Singapore 169857, Singapore.
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27
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Integrase as a Novel Target for the Inhibition of Human Immunodeficiency Virus Type 1 Infection: Current Status and Future Perspectives. Antiviral Res 2014. [DOI: 10.1128/9781555815493.ch5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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28
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Abstract
HIV integrase (IN) catalyzes the insertion into the genome of the infected human cell of viral DNA produced by the retrotranscription process. The discovery of raltegravir validated the existence of the IN, which is a new target in the field of anti-HIV drug research. The mechanism of catalysis of IN is depicted, and the characteristics of the inhibitors of the catalytic site of this viral enzyme are reported. The role played by the resistance is elucidated, as well as the possibility of bypassing this problem. New approaches to block the integration process are depicted as future perspectives, such as development of allosteric IN inhibitors, dual inhibitors targeting both IN and other enzymes, inhibitors of enzymes that activate IN, activators of IN activity, as well as a gene therapy approach.
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Affiliation(s)
- Roberto Di Santo
- Dipartimento
di Chimica e
Tecnologie del Farmaco, Istituto Pasteur, Fondazione Cenci Bolognetti, “Sapienza” Università di Roma, P.le Aldo Moro 5, I-00185 Rome, Italy
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29
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Klinger PP, Schubert U. The ubiquitin–proteasome system in HIV replication: potential targets for antiretroviral therapy. Expert Rev Anti Infect Ther 2014; 3:61-79. [PMID: 15757458 DOI: 10.1586/14787210.3.1.61] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Since the discovery of HIV approximately 20 years ago, more than 60 million individuals have been infected, and AIDS still remains one of the most devastating diseases humankind has ever faced. Unfortunately, there is little hope that an effective vaccine will be developed in the near future. Current antiretroviral treatment is based on drugs that either target the viral enzymes (protease and reverse transcriptase) or the attachment and entry of the virus. Although the introduction of highly active antiretroviral therapy in the mid-1990s has led to a profound reduction in HIV-related morbidity and mortality, the complete eradication of the virus from infected individuals has never been achieved. In addition, these antiviral drugs can induce serious adverse effects, particularly when administered in combination over prolonged treatment periods. A further drawback to these treatments is that with the high mutation rate of HIV, drug-resistant mutants are evolving, particularly when antiretroviral treatment only suppresses virus replication to marginal levels in latently infected cells making up the virus reservoirs in vivo. Cellular genes have much lower mutation rates, and drug-mediated modulation of specific cellular pathways represents an attractive antiviral strategy. Recent findings showing that proteasome inhibitors interfere with budding, maturation and infectivity of HIV have triggered intensive investigation of the hitherto unappreciated function of the ubiquitin-proteasome system in HIV replication. It was also observed that, like several other retroviruses, HIV-1 virions contain a small amount of mono-ubiquitinylated Gag proteins. Currently, two E3-type ubiquitin ligases, in addition to one E3-like protein, have been identified as regulators of HIV budding. These ligases might represent interesting targets for therapeutic intervention.
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Affiliation(s)
- Patricia P Klinger
- University of Erlangen-Nuremberg, Institute of Clinical and Molecular Virology, Schlossgarten 4, 91054 Erlangen, Germany
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30
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Debyser Z, Desimmie BA, Taltynov O, Demeulemeester J, Christ F. Validation of host factors of HIV integration as novel drug targets for anti-HIV therapy. MEDCHEMCOMM 2014. [DOI: 10.1039/c3md00302g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
After identification and validation, viral protein/cellular co-factor interactions such as the HIV integrase-LEDGF/p75 interaction represent novel targets for antiviral drug development.
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Affiliation(s)
- Zeger Debyser
- Laboratory for Molecular Virology and Gene Therapy
- KU Leuven
- Leuven
- Belgium
| | - Belete A. Desimmie
- Laboratory for Molecular Virology and Gene Therapy
- KU Leuven
- Leuven
- Belgium
| | - Oliver Taltynov
- Laboratory for Molecular Virology and Gene Therapy
- KU Leuven
- Leuven
- Belgium
| | | | - Frauke Christ
- Laboratory for Molecular Virology and Gene Therapy
- KU Leuven
- Leuven
- Belgium
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31
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Morchikh M, Naughtin M, Di Nunzio F, Xavier J, Charneau P, Jacob Y, Lavigne M. TOX4 and NOVA1 proteins are partners of the LEDGF PWWP domain and affect HIV-1 replication. PLoS One 2013; 8:e81217. [PMID: 24312278 PMCID: PMC3842248 DOI: 10.1371/journal.pone.0081217] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Accepted: 10/10/2013] [Indexed: 12/31/2022] Open
Abstract
PWWP domains are involved in the chromatin attachment of several proteins. They bind to both DNA and proteins and their interaction with specific histone methylation marks define them as a new class of histone code readers. The lens epithelium derived growth factor (LEDGF/p75) contains an N-terminal PWWP domain necessary for its interaction with chromatin but also a C-terminal domain which interacts with several proteins, such as lentiviral integrases. These two domains confer a chromatin-tethering function to LEDGF/p75 and in the case of lentiviral integrases, this tethering participates in the efficiency and site selectivity of integration. Although proteins interacting with LEDGF/p75 C-terminal domain have been extensively studied, no data exist about partners of its PWWP domain regulating its interaction with chromatin. In this study, we report the identification by yeast-two-hybrid of thirteen potential partners of the LEDGF PWWP domain. Five of these interactions were confirmed in mammalian cells, using both a protein complementation assay and co-immunoprecipitation approaches. Three of these partners interact with full length LEDGF/p75, they are specific for PWWP domains of the HDGF family and they require PWWP amino acids essential for the interaction with chromatin. Among them, the transcription activator TOX4 and the splicing cofactor NOVA1 were selected for a more extensive study. These two proteins or their PWWP interacting regions (PIR) colocalize with LEDGF/p75 in Hela cells and interact in vitro in the presence of DNA. Finally, single round VSV-G pseudotyped HIV-1 but not MLV infection is inhibited in cells overexpressing these two PIRs. The observed inhibition of infection can be attributed to a defect in the integration step. Our data suggest that a regulation of LEDGF interaction with chromatin by cellular partners of its PWWP domain could be involved in several processes linked to LEDGF tethering properties, such as lentiviral integration, DNA repair or transcriptional regulation.
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Affiliation(s)
- Mehdi Morchikh
- Ecole Normale Supérieure, Laboratoire Joliot-Curie, Centre National de la Recherche Scientifique, Lyon, France
- Institut Pasteur, Unité de Virologie Structurale, Centre National de la Recherche Scientifique, Unité de recherche associée, Paris, France
- Université Pierre et Marie Curie, Paris, France
| | - Monica Naughtin
- Ecole Normale Supérieure, Laboratoire Joliot-Curie, Centre National de la Recherche Scientifique, Lyon, France
| | - Francesca Di Nunzio
- Institut Pasteur, Unité de Virologie Moléculaire et Vaccinologie, Centre National de la Recherche Scientifique, Paris, France
| | - Johan Xavier
- Ecole Normale Supérieure, Laboratoire Joliot-Curie, Centre National de la Recherche Scientifique, Lyon, France
| | - Pierre Charneau
- Institut Pasteur, Unité de Virologie Moléculaire et Vaccinologie, Centre National de la Recherche Scientifique, Paris, France
| | - Yves Jacob
- Institut Pasteur, Unité de Génétique Moléculaire des Virus à ARN, Centre National de la Recherche Scientifique, Paris, France
- Center for Cancer Systems Biology and Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Marc Lavigne
- Ecole Normale Supérieure, Laboratoire Joliot-Curie, Centre National de la Recherche Scientifique, Lyon, France
- Institut Pasteur, Unité de Virologie Structurale, Centre National de la Recherche Scientifique, Unité de recherche associée, Paris, France
- * E-mail:
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32
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Nomura W, Aikawa H, Ohashi N, Urano E, Métifiot M, Fujino M, Maddali K, Ozaki T, Nozue A, Narumi T, Hashimoto C, Tanaka T, Pommier Y, Yamamoto N, Komano JA, Murakami T, Tamamura H. Cell-permeable stapled peptides based on HIV-1 integrase inhibitors derived from HIV-1 gene products. ACS Chem Biol 2013; 8:2235-44. [PMID: 23898787 DOI: 10.1021/cb400495h] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
HIV-1 integrase (IN) is an enzyme which is indispensable for the stable infection of host cells because it catalyzes the insertion of viral DNA into the genome and thus is an attractive target for the development of anti-HIV agents. Earlier, we found Vpr-derived peptides with inhibitory activity against HIV-1 IN. These Vpr-derived peptides are originally located in an α-helical region of the parent Vpr protein. Addition of an octa-arginyl group to the inhibitory peptides caused significant inhibition against HIV replication associated with an increase in cell permeability but also relatively high cytotoxicity. In the current study, stapled peptides, a new class of stabilized α-helical peptidomimetics were adopted to enhance the cell permeability of the above lead peptides. A series of stapled peptides, which have a hydrocarbon link formed by a ruthenium-catalyzed ring-closing metathesis reaction between successive turns of α-helix, were designed, synthesized, and evaluated for biological activity. In cell-based assays some of the stapled peptides showed potent anti-HIV activity comparable with that of the original octa-arginine-containing peptide (2) but with lower cytotoxicity. Fluorescent imaging experiments revealed that these stapled peptides are significantly cell permeable, and CD analysis showed they form α-helical structures, whereas the unstapled congeners form β-sheet structures. The application of this stapling strategy to Vpr-derived IN inhibitory peptides led to a remarkable increase in their potency in cells and a significant reduction of their cytotoxicity.
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Affiliation(s)
- Wataru Nomura
- Department of Medicinal Chemistry, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai,
Chiyoda-ku, Tokyo 101-0062, Japan
| | - Haruo Aikawa
- Department of Medicinal Chemistry, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai,
Chiyoda-ku, Tokyo 101-0062, Japan
| | - Nami Ohashi
- Department of Medicinal Chemistry, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai,
Chiyoda-ku, Tokyo 101-0062, Japan
| | - Emiko Urano
- AIDS Research Center, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640,
Japan
| | - Mathieu Métifiot
- Laboratory of Molecular
Pharmacology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892-4255, United States
| | - Masayuki Fujino
- AIDS Research Center, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640,
Japan
| | - Kasthuraiah Maddali
- Laboratory of Molecular
Pharmacology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892-4255, United States
| | - Taro Ozaki
- Department of Medicinal Chemistry, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai,
Chiyoda-ku, Tokyo 101-0062, Japan
| | - Ami Nozue
- Department of Medicinal Chemistry, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai,
Chiyoda-ku, Tokyo 101-0062, Japan
| | - Tetsuo Narumi
- Department of Medicinal Chemistry, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai,
Chiyoda-ku, Tokyo 101-0062, Japan
| | - Chie Hashimoto
- Department of Medicinal Chemistry, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai,
Chiyoda-ku, Tokyo 101-0062, Japan
| | - Tomohiro Tanaka
- Department of Medicinal Chemistry, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai,
Chiyoda-ku, Tokyo 101-0062, Japan
| | - Yves Pommier
- Laboratory of Molecular
Pharmacology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892-4255, United States
| | - Naoki Yamamoto
- Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore
| | - Jun A. Komano
- AIDS Research Center, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640,
Japan
- Department of Infectious Diseases, Osaka Prefectural Institute of Public Health, 1-3-69
Nakamichi, Higashinari-ku, Osaka 537-0025, Japan
| | - Tsutomu Murakami
- AIDS Research Center, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640,
Japan
| | - Hirokazu Tamamura
- Department of Medicinal Chemistry, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai,
Chiyoda-ku, Tokyo 101-0062, Japan
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33
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Chereshnev VA, Bocharov G, Bazhan S, Bachmetyev B, Gainova I, Likhoshvai V, Argilaguet JM, Martinez JP, Rump JA, Mothe B, Brander C, Meyerhans A. Pathogenesis and treatment of HIV infection: the cellular, the immune system and the neuroendocrine systems perspective. Int Rev Immunol 2013; 32:282-306. [PMID: 23617796 DOI: 10.3109/08830185.2013.779375] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Infections with HIV represent a great challenge for the development of strategies for an effective cure. The spectrum of diseases associated with HIV ranges from opportunistic infections and cancers to systemic physiological disorders like encephalopathy and neurocognitive impairment. A major progress in controlling HIV infection has been achieved by highly active antiretroviral therapy (HAART). However, HAART does neither eliminate the virus reservoirs in form of latently infected cells nor does it completely reconstitute immune reactivity and physiological status. Furthermore, the failure of the STEP vaccine trial and the only marginal efficacies of the RV144 trial together suggest that the causal relationships between the complex sets of viral and immunological processes that contribute to protection or disease pathogenesis are still poorly understood. Here, we provide an up-to-date overview of HIV-host interactions at the cellular, the immune system and the neuroendocrine systems level. Only by integrating this multi-level knowledge one will be able to handle the systems complexity and develop new methodologies of analysis and prediction for a functional restoration of the immune system and the health of the infected host.
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Affiliation(s)
- V A Chereshnev
- Institute of Immunology and Physiology, Ural Branch RAS, Ekaterinburg, Russia.
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34
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miR-154 inhibits EMT by targeting HMGA2 in prostate cancer cells. Mol Cell Biochem 2013; 379:69-75. [PMID: 23591597 DOI: 10.1007/s11010-013-1628-4] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2012] [Accepted: 03/21/2013] [Indexed: 10/26/2022]
Abstract
Epithelial-mesenchymal transition (EMT) is a crucial process that plays an important role in the invasion and metastasis of human cancers. High-mobility group AT-hook 2 (HMGA2) has been found to be involved in the EMT program, with its aberrant expression having been observed in a variety of malignant tumors. However, the mechanisms regulating HMGA2 expression remain incompletely understood. The objective of this study was to investigate whether mir-154 plays a critical role in EMT by regulating HMGA2. The expression levels of HMGA2 were examined in four samples of prostate cancer (PCa) tissue and adjacent non-tumorous tissue by Western blot analysis. The effects of forced expression of miR-154 or HMGA2 knockdown on PCa cells were evaluated by cell migration and invasion assays and Western blot analysis. HMGA2 was upregulated in the PCa tissue samples compared with the adjacent normal ones. Forced expression of miR-154 or HMGA2 knockdown significantly reduced the migratory and invasive capabilities of PCa cells in vitro and inhibited EMT gene expression, increased the levels of E-cadherin, an epithelial marker, and decreased the levels of vimentin, a mesenchymal marker. HMGA2 is a direct target gene of miR-154 by dual-luciferase reporter assay. Our findings suggest that miR-154 plays a role in regulating EMT by targeting HMGA2. Understanding the targets and regulating pathways of miR-154 may provide new insights into the underlying pathogenesis of PCa.
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35
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Gómez-Orte E, Vicient CM, Martínez-Izquierdo JA. Grande retrotransposons contain an accessory gene in the unusually long 3'-internal region that encodes a nuclear protein transcribed from its own promoter. PLANT MOLECULAR BIOLOGY 2013; 81:541-51. [PMID: 23423698 DOI: 10.1007/s11103-013-0019-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Accepted: 01/21/2013] [Indexed: 05/22/2023]
Abstract
LTR retrotransposons are major components of plant genomes playing important roles in the evolution of their host genomes, for example, generating new genes or providing new promoters to existing genes. The Grande family of retrotransposons is present in Zea species and is characterized by an unusually long internal region due to the presence of a 7-kbp region between the gag-pol coding region and the 3'LTR. We demonstrate here that such unusual sequence is present in the great majority of Grande copies in maize genome. This region contains a gene, gene23, which is transcribed from its own promoter in antisense orientation to the gag-pol genes. The expression of gene23 is ubiquitous, and its promoter contains all the putative consensus sequences typical of eukaryotic promoters, being able to direct GUS expression in different plant species and organs. The coding region of gene23 is conserved in most Grande copies and encodes a protein rich in glycine, serine, and acidic amino acids that shows no significant similarity with any protein of known function. Nevertheless, the C- and N-terminal parts are rich in basic amino acids, and these are interspersed with other amino acids in its C-terminus, compatible with a putative DNA-binding function. It contains a nuclear localization signal KRKR motif in the N-terminus. Fusions to GFP demonstrate that this protein localizes in the nucleus. We discuss the possible origin of gene23 and the potential function of its encoded protein.
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Affiliation(s)
- Eva Gómez-Orte
- Centre de Recerca en Agrigenòmica (CSIC-IRTA-UAB-UB), Edifici CRAG, Campus UAB, Bellaterra, Cerdanyola del Vallés, Barcelona, Spain
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36
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Involvement of human topoisomerase II isoforms in HIV-1 reverse transcription. Arch Biochem Biophys 2013; 532:91-102. [PMID: 23399433 DOI: 10.1016/j.abb.2013.01.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Revised: 01/28/2013] [Accepted: 01/30/2013] [Indexed: 11/20/2022]
Abstract
HIV-1 reverse transcription (RTn) involves synthesis of double strand DNA (dsDNA) from viral genomic RNA. Topoisomerase II (Topo II) alpha and beta maintains topological reorganization of dsDNA regions and catalytic inhibition of these isoforms repressed viral replicative cycle. Present study is aimed to understand the role of Topo II isoforms in HIV-1 early replication. Topo IIα and β showed differential expression in SupT1 cells and PBMCs during early hours of HIV-1 infection where Topo IIα expression increased after 4h, while Topo IIβ showed relatively higher expression at 1 and 4h. In Topo IIα and/or β down regulated cells, transcription of viral genes gag, pol and env as well as proviral DNA synthesis was abolished. In Topo IIα and/or β down regulated cells, strong stop DNA synthesis was unaffected while other downstream events of reverse transcription such as first strand transfer, full length minus strand synthesis, and second strand transfer were completely inhibited, which affects HIV-1 replication. Further, co-localization of Topo II isoforms with HIV-1 reverse transcriptase was observed in SupT1 cells and PBMCs by immunofluorescence. These results collectively suggest a role of Topo II isoforms during HIV-1 RTn probably by promoting the alignment of viral RNA-DNA hybrids.
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37
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Eilebrecht S, Wilhelm E, Benecke BJ, Bell B, Benecke AG. HMGA1 directly interacts with TAR to modulate basal and Tat-dependent HIV transcription. RNA Biol 2013; 10:436-44. [PMID: 23392246 DOI: 10.4161/rna.23686] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The transactivating response element (TAR) of human immunodeficiency virus 1 (HIV-1) is essential for promoter transactivation by the viral transactivator of transcription (Tat). The Tat-TAR interaction thereby recruits active positive transcription elongation factor b (P-TEFb) from its inactive, 7SK/HEXIM1-bound form, leading to efficient viral transcription. Here, we show that the 7SK RNA-associating chromatin regulator HMGA1 can specifically bind to the HIV-1 TAR element and that 7SK RNA can thereby compete with TAR. The HMGA1-binding interface of TAR is located within the binding site for Tat and other cellular activators, and we further provide evidence for competition between HMGA1 and Tat for TAR-binding. HMGA1 negatively influences the expression of a HIV-1 promoter-driven reporter in a TAR-dependent manner, both in the presence and in the absence of Tat. The overexpression of the HMGA1-binding substructure of 7SK RNA results in a TAR-dependent gain of HIV-1 promoter activity similar to the effect of the shRNA-mediated knockdown of HMGA1. Our results support a model in which the HMGA1/TAR interaction prevents the binding of transcription-activating cellular co-factors and Tat, subsequently leading to reduced HIV-1 transcription.
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Affiliation(s)
- Sebastian Eilebrecht
- Institut des Hautes Études Scientifiques - Centre National de la Recherche Scientifique; Bures sur Yvette; France & Vaccine Research Institute; Institut Mondor de Recherche Biomédicale; Créteil, France
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38
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Schweitzer CJ, Jagadish T, Haverland N, Ciborowski P, Belshan M. Proteomic analysis of early HIV-1 nucleoprotein complexes. J Proteome Res 2013; 12:559-72. [PMID: 23282062 PMCID: PMC3564510 DOI: 10.1021/pr300869h] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
After entry into the cell, the early steps of the human immunodeficiency virus type 1 (HIV-1) replication cycle are mediated by two functionally distinct nucleoprotein complexes, the reverse transcription complex (RTC) and preintegration complex (PIC). These two unique viral complexes are responsible for the conversion of the single-stranded RNA genome into double-stranded DNA, transport of the DNA into the nucleus, and integration of the viral DNA into the host cell chromosome. Prior biochemical analyses suggest that these complexes are large and contain multiple undiscovered host cell factors. In this study, functional HIV-1 RTCs and PICs were partially purified by velocity gradient centrifugation and fractionation, concentrated, trypsin digested, and analyzed by LC-MS/MS. A total of seven parallel infected and control biological replicates were completed. Database searches were performed with Proteome Discoverer and a comparison of the HIV-1 samples to parallel uninfected control samples was used to identify unique cellular factors. The analysis produced a total data set of 11055 proteins. Several previously characterized HIV-1 factors were identified, including XRCC6, TFRC, and HSP70. The presence of XRCC6 was confirmed in infected fractions and shown to be associated with HIV-1 DNA by immunoprecipitation-PCR experiments. Overall, the analysis identified 94 proteins unique in the infected fractions and 121 proteins unique to the control fractions with ≥ 2 protein assignments. An additional 54 and 52 were classified as enriched in the infected and control samples, respectively, based on a 3-fold difference in total Proteome Discoverer probability score. The differential expression of several candidate proteins was validated by Western blot analysis. This study contributes additional novel candidate proteins to the growing published bioinformatic data sets of proteins that contribute to HIV-1 replication.
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MESH Headings
- Antigens, CD/genetics
- Antigens, CD/metabolism
- Antigens, Nuclear/genetics
- Antigens, Nuclear/metabolism
- Cell Line
- Cell Nucleus/genetics
- Cell Nucleus/metabolism
- Cell Nucleus/virology
- Centrifugation, Density Gradient
- Chromatography, Liquid
- DNA, Viral/genetics
- DNA, Viral/metabolism
- DNA-Binding Proteins/genetics
- DNA-Binding Proteins/metabolism
- Gene Expression Profiling
- HIV-1/genetics
- HIV-1/metabolism
- HSP70 Heat-Shock Proteins/genetics
- HSP70 Heat-Shock Proteins/metabolism
- Host-Pathogen Interactions
- Humans
- Ku Autoantigen
- Lymphocytes/metabolism
- Lymphocytes/virology
- Nucleoproteins/genetics
- Nucleoproteins/metabolism
- Protein Binding
- Proteome/genetics
- Proteome/metabolism
- Receptors, Transferrin/genetics
- Receptors, Transferrin/metabolism
- Reverse Transcription
- Tandem Mass Spectrometry
- Viral Proteins/genetics
- Viral Proteins/metabolism
- Virus Integration
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Affiliation(s)
| | - Teena Jagadish
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE
| | - Nicole Haverland
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE
| | - Pawel Ciborowski
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE
- The Nebraska Center for Virology, University of Nebraska, Lincoln, NE
| | - Michael Belshan
- Department of Medical Microbiology and Immunology, Creighton University, Omaha, NE
- The Nebraska Center for Virology, University of Nebraska, Lincoln, NE
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39
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Gérard A, Soler N, Ségéral E, Belshan M, Emiliani S. Identification of low molecular weight nuclear complexes containing integrase during the early stages of HIV-1 infection. Retrovirology 2013; 10:13. [PMID: 23369367 PMCID: PMC3571920 DOI: 10.1186/1742-4690-10-13] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Accepted: 01/03/2013] [Indexed: 12/18/2022] Open
Abstract
Background HIV-1 replication requires integration of its reverse transcribed viral cDNA into a host cell chromosome. The DNA cutting and joining reactions associated to this key step are catalyzed by the viral protein integrase (IN). In infected cells, IN binds the viral cDNA, together with viral and cellular proteins, to form large nucleoprotein complexes. However, the dynamics of IN complexes formation is still poorly understood. Results Here, we characterized IN complexes during the early stages of T-lymphocyte infection. We found that following viral entry into the host cell, IN was rapidly targeted to proteasome-mediated degradation. Interactions between IN and cellular cofactors LEDGF/p75 and TNPO3 were detected as early as 6 h post-infection. Size exclusion chromatography of infected cell extracts revealed distinct IN complexes in vivo. While at 2 h post-infection the majority of IN eluted within a high molecular weight complex competent for integration (IN complex I), IN was also detected in a low molecular weight complex devoid of full-length viral cDNA (IN complex II, ~440 KDa). At 6 h post-infection the relative proportion of IN complex II increased. Inhibition of reverse transcription or integration did not alter the elution profile of IN complex II in infected cells. However, in cells depleted for LEDGF/p75 IN complex II shifted to a lower molecular weight complex (IN complex III, ~150 KDa) containing multimers of IN. Notably, cell fractionation experiments indicated that both IN complex II and III were exclusively nuclear. Finally, IN complex II was not detected in cells infected with a virus harboring a mutated IN defective for LEDGF/p75 interaction and tetramerization. Conclusions Our findings indicate that, shortly after viral entry, a significant portion of DNA–free IN that is distinct from active pre-integration complexes accumulates in the nucleus.
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Chakraborty A, Sun GQ, Mustavich L, Huang SH, Li BL. Biochemical interactions between HIV-1 integrase and reverse transcriptase. FEBS Lett 2012; 587:425-9. [DOI: 10.1016/j.febslet.2012.12.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Revised: 12/03/2012] [Accepted: 12/06/2012] [Indexed: 10/27/2022]
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Jarboui MA, Bidoia C, Woods E, Roe B, Wynne K, Elia G, Hall WW, Gautier VW. Nucleolar protein trafficking in response to HIV-1 Tat: rewiring the nucleolus. PLoS One 2012; 7:e48702. [PMID: 23166591 PMCID: PMC3499507 DOI: 10.1371/journal.pone.0048702] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Accepted: 10/03/2012] [Indexed: 12/20/2022] Open
Abstract
The trans-activator Tat protein is a viral regulatory protein essential for HIV-1 replication. Tat trafficks to the nucleoplasm and the nucleolus. The nucleolus, a highly dynamic and structured membrane-less sub-nuclear compartment, is the site of rRNA and ribosome biogenesis and is involved in numerous cellular functions including transcriptional regulation, cell cycle control and viral infection. Importantly, transient nucleolar trafficking of both Tat and HIV-1 viral transcripts are critical in HIV-1 replication, however, the role(s) of the nucleolus in HIV-1 replication remains unclear. To better understand how the interaction of Tat with the nucleolar machinery contributes to HIV-1 pathogenesis, we investigated the quantitative changes in the composition of the nucleolar proteome of Jurkat T-cells stably expressing HIV-1 Tat fused to a TAP tag. Using an organellar proteomic approach based on mass spectrometry, coupled with Stable Isotope Labelling in Cell culture (SILAC), we quantified 520 proteins, including 49 proteins showing significant changes in abundance in Jurkat T-cell nucleolus upon Tat expression. Numerous proteins exhibiting a fold change were well characterised Tat interactors and/or known to be critical for HIV-1 replication. This suggests that the spatial control and subcellular compartimentaliation of these cellular cofactors by Tat provide an additional layer of control for regulating cellular machinery involved in HIV-1 pathogenesis. Pathway analysis and network reconstruction revealed that Tat expression specifically resulted in the nucleolar enrichment of proteins collectively participating in ribosomal biogenesis, protein homeostasis, metabolic pathways including glycolytic, pentose phosphate, nucleotides and amino acids biosynthetic pathways, stress response, T-cell signaling pathways and genome integrity. We present here the first differential profiling of the nucleolar proteome of T-cells expressing HIV-1 Tat. We discuss how these proteins collectively participate in interconnected networks converging to adapt the nucleolus dynamic activities, which favor host biosynthetic activities and may contribute to create a cellular environment supporting robust HIV-1 production.
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Affiliation(s)
- Mohamed Ali Jarboui
- Centre for Research in Infectious Diseases (CRID), School of Medicine and Medical Science (SMMS), University College Dublin (UCD), Dublin, Ireland
| | - Carlo Bidoia
- Centre for Research in Infectious Diseases (CRID), School of Medicine and Medical Science (SMMS), University College Dublin (UCD), Dublin, Ireland
| | - Elena Woods
- Centre for Research in Infectious Diseases (CRID), School of Medicine and Medical Science (SMMS), University College Dublin (UCD), Dublin, Ireland
| | - Barbara Roe
- Centre for Research in Infectious Diseases (CRID), School of Medicine and Medical Science (SMMS), University College Dublin (UCD), Dublin, Ireland
| | - Kieran Wynne
- Mass Spectrometry Resource (MSR), Conway Institute for Biomolecular and Biomedical Research, University College Dublin (UCD), Dublin, Ireland
| | - Giuliano Elia
- Mass Spectrometry Resource (MSR), Conway Institute for Biomolecular and Biomedical Research, University College Dublin (UCD), Dublin, Ireland
| | - William W. Hall
- Centre for Research in Infectious Diseases (CRID), School of Medicine and Medical Science (SMMS), University College Dublin (UCD), Dublin, Ireland
| | - Virginie W. Gautier
- Centre for Research in Infectious Diseases (CRID), School of Medicine and Medical Science (SMMS), University College Dublin (UCD), Dublin, Ireland
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Abstract
Retroviral infections cause a variety of cancers in animals and a number of diverse diseases in humans such as leukemia and acquired immune deficiency syndrome. Productive and efficient proviral integration is critical for retroviral function and is the key step in establishing a stable and productive infection, as well as the mechanism by which host genes are activated in leukemogenesis. Host factors are widely anticipated to be involved in all stages of the retroviral life cycle, and the identification of integrase interacting factors has the potential to increase our understanding of mechanisms by which the incoming virus might appropriate cellular proteins to target and capture host DNA sequences. Identification of MoMLV integrase interacting host factors may be key to designing efficient and benign retroviral-based gene therapy vectors; key to understanding the basic mechanism of integration; and key in designing efficient integrase inhibitors. In this review, we discuss current progress in the field of MoMLV integrase interacting proteins and possible roles for these proteins in integration.
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Cellular cofactors of lentiviral integrase: from target validation to drug discovery. Mol Biol Int 2012; 2012:863405. [PMID: 22928108 PMCID: PMC3420096 DOI: 10.1155/2012/863405] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Revised: 06/03/2012] [Accepted: 06/27/2012] [Indexed: 01/30/2023] Open
Abstract
To accomplish their life cycle, lentiviruses make use of host proteins, the so-called cellular cofactors. Interactions between host cell and viral proteins during early stages of lentiviral infection provide attractive new antiviral targets. The insertion of lentiviral cDNA in a host cell chromosome is a step of no return in the replication cycle, after which the host cell becomes a permanent carrier of the viral genome and a producer of lentiviral progeny. Integration is carried out by integrase (IN), an enzyme playing also an important role during nuclear import. Plenty of cellular cofactors of HIV-1 IN have been proposed. To date, the lens epithelium-derived growth factor (LEDGF/p75) is the best studied cofactor of HIV-1 IN. Moreover, small molecules that block the LEDGF/p75-IN interaction have recently been developed for the treatment of HIV infection. The nuclear import factor transportin-SR2 (TRN-SR2) has been proposed as another interactor of HIV IN-mediating nuclear import of the virus. Using both proteins as examples, we will describe approaches to be taken to identify and validate novel cofactors as new antiviral targets. Finally, we will highlight recent advances in the design and the development of small-molecule inhibitors binding to the LEDGF/p75-binding pocket in IN (LEDGINs).
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Schweitzer CJ, Matthews JM, Madson CJ, Donnellan MR, Cerny RL, Belshan M. Knockdown of the cellular protein LRPPRC attenuates HIV-1 infection. PLoS One 2012; 7:e40537. [PMID: 22808186 PMCID: PMC3395635 DOI: 10.1371/journal.pone.0040537] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Accepted: 06/12/2012] [Indexed: 01/28/2023] Open
Abstract
HIV-1 exploits numerous host cellular pathways for productive infection. To identify novel factors involved in HIV-1 replication, HIV-1 integrase and matrix protein complexes were captured at 4 hours post infection for proteomic analysis using an affinity purification system. Leucine-rich PPR-motif containing (LRPPRC) protein, a cellular protein involved in mitochondrial function, cell metabolism, and cell-cycle progression was identified as one of the candidate HIV-1 factors. Co-immunoprecipitation RT-PCR experiments confirmed that LRPPRC associated with HIV-1 nucleic acids during the early steps of virus infection. To establish if LRPPRC was critical for HIV-1 infection, three independent LRPPRC knockdown cell lines were constructed (2.7, 3.6, and 4.1). Subcellular fractionation of these cell lines revealed differential knockdown of LRPPRC in subcellular compartments. LRPPRC was knocked down in the insoluble/cytoskeletal fractions of all three cell lines, but the 3.6 and 4.1 cells also showed a reduction in nuclear LRPPRC. Additionally, several cellular factors were downregulated and/or disrupted by loss of LRPPRC. HIV-1 infection was reduced in all three cell lines, but virus production and RNA encapsidation were unaffected, suggesting that LRPPRC was critical for the afferent stage of virus replication. Two of the three cell lines (3.6, 4.1) were refractory for murine leukemia virus infection, a virus dependent on cellular proliferation for productive infection. Consistent with this, these two cell lines exhibited reduced cellular growth with no loss of cellular viability or change in cell cycle phenotype. The early steps of virus infection were also differentially affected among the cell lines. A reduced level of preintegration complex formation was observed in all three cell lines, but viral DNA nuclear import was reduced only in the 3.6 and 4.1 cells. Combined, these data identify LRPPRC as a HIV-1 factor that is involved in HIV-1 replication through more than one mechanism.
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Affiliation(s)
- Cameron J. Schweitzer
- Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, Nebraska, United States of America
| | - John M. Matthews
- Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, Nebraska, United States of America
| | - Christian J. Madson
- Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, Nebraska, United States of America
| | - Meghan R. Donnellan
- Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, Nebraska, United States of America
| | - Ronald L. Cerny
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, United States of America
- The Nebraska Center for Virology, Lincoln, Nebraska, United States of America
| | - Michael Belshan
- Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, Nebraska, United States of America
- The Nebraska Center for Virology, Lincoln, Nebraska, United States of America
- * E-mail:
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Abstract
Integration of viral DNA into cellular DNA is an essential step in the replication cycle of HIV and other retroviruses. The first antiviral drugs that target integrase, the viral enzyme that catalyzes DNA integration, have recently been approved and more are in the pipeline. These drugs bind to an intermediate in DNA integration called the intasome, in which a pair of viral DNA ends are synapsed by a tetramer of integrase, rather than free integrase enzyme. We discuss the biochemical mechanism of integration, which is now quite well understood, and recent progress towards obtaining atomic-resolution structures of HIV intasomes in complex with inhibitors. Such structures are ultimately required to understand the detailed mechanism of inhibition and the mechanisms by which mutations in integrase confer resistance. The path from early biochemical studies to therapeutic inhibitors of integrase highlights the value of basic science in fighting human diseases.
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Affiliation(s)
- Robert Craigie
- Laboratory of Molecular Biology, National Institute of Diabetes & Digestive & Kidney Diseases, NIH, Bethesda, MD 20892-0560, USA, Tel.: +1 301 496 4081, ,
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Suzuki Y, Chew ML, Suzuki Y. Role of host-encoded proteins in restriction of retroviral integration. Front Microbiol 2012; 3:227. [PMID: 22737148 PMCID: PMC3381236 DOI: 10.3389/fmicb.2012.00227] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Accepted: 06/02/2012] [Indexed: 11/13/2022] Open
Abstract
In retroviral infections, a copy of the viral DNA is first synthesized from genomic RNA by reverse transcription and subsequently integrated into host chromatin. This integration step, executed by the viral enzyme integrase (IN), is one of the hallmarks of retroviral infection. Although an obligate role for IN in retroviral integration has been clearly defined by numerous biochemical analysis of its recombinant protein and genetic analysis of the viral IN gene, several host cellular proteins have also been implicated as key factors involved in the integration step during viral replication. Although studies on integration cofactors have mostly emphasized factors that aid the integration process either through direct or indirect association with IN, it has become apparent that host cells may also harbor proteins that act as inhibitors of retroviral integration. Intriguingly, some of these inhibitory proteins appear to hamper the integration process via posttranslational modifications of the components of the preintegration complex including IN. A better understanding of the molecular mechanisms leading to the inhibition of integration will provide us with clues for the development of new strategies for treating retroviral infections. In this review, we draw attention to recent insights regarding potential host cellular factors that restrict integration, and illustrate how these inhibitory effects are achieved.
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Affiliation(s)
- Yasutsugu Suzuki
- Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
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Li M, Ivanov V, Mizuuchi M, Mizuuchi K, Craigie R. DNA requirements for assembly and stability of HIV-1 intasomes. Protein Sci 2012; 21:249-57. [PMID: 22124978 DOI: 10.1002/pro.2010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Integration of viral DNA into the host genome is an essential step in retroviral replication that is mediated by a stable nucleoprotein complex comprising a tetramer of integrase bridging the two ends of the viral DNA in a stable synaptic complex (SSC) or intasome. Assembly of HIV-1 intasomes requires several hundred base pairs of nonspecific internal DNA in addition to the terminal viral DNA sequence that is protected in footprinting experiments. We find that only one of the viral DNA ends in the intasome requires long-nonspecific internal DNA for intasome assembly. Although intasomes are unstable in solution when the nonspecific internal DNA is cut off after assembly, they are stable in agarose gels. These complexes are indistinguishable from SSCs with nonspecific internal DNA in Förster resonance energy transfer (FRET) experiments suggesting the interactions with the viral DNA and integrase tetramer are the same regardless of the presence of nonspecific internal DNA. We discuss models of how the internal DNA contributes to intasome assembly and stability. FRET is exquisitely sensitive to the distance between the fluorophores and given certain assumptions can be translated to distance measurements. We anticipated that a set of such distance constraints would provide a map of the DNA path within the intasome. In reality, the constraints we could impose from the FRET data were quite weak allowing a wide envelope for the possible path. We discuss the difficulties of converting the FRET signal to absolute distance within nucleoprotein complexes.
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Affiliation(s)
- Min Li
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
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O'Shea LC, Mehta J, Lonergan P, Hensey C, Fair T. Developmental competence in oocytes and cumulus cells: candidate genes and networks. Syst Biol Reprod Med 2012; 58:88-101. [PMID: 22313243 DOI: 10.3109/19396368.2012.656217] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Common aspects of infertility can be seen across several species. In humans, dairy cows, and mares there is only a 25-35% chance of producing a live offspring after a single insemination, whether natural or artificial. Oocyte quality and subsequent embryo development can be affected by factors such as nutrition, hormonal regulation, and environmental influence. The objective of this study was to identify genes expressed in oocytes and/or cumulus cells, across a diverse range of species, which may be linked to the ability an oocyte has to develop following fertilization. Performing a meta-analysis on previously published microarray data on various models of oocyte and embryo quality allowed for the identification of 56 candidate genes associated with oocyte quality across several species, 4 of which were identified in the cumulus cells that surround the oocyte. Twenty-one potential biomarkers were associated with increased competence and 35 potential biomarkers were associated with decreased competence. The upregulation of Metap2, and the decrease of multiple genes linked to mRNA and protein synthesis in models of competence, highlights the importance of de novo protein synthesis and its regulation for successful oocyte maturation and subsequent development. The negative regulation of Wnt signaling has emerged in human, monkey, bovine, and mouse models of oocyte competence. Atrx expression was linked to decreased competence in both oocytes and cumulus cells. Biological networks and transcription factor regulation associated with increased and decreased competence were also identified. These genes could potentially act as biomarkers of oocyte quality or as pharmacological targets for manipulation in order to improve oocyte developmental potential.
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Affiliation(s)
- Lynne C O'Shea
- School of Biomolecular and Biomedical Science, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin 4, Ireland
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Friedrich BM, Dziuba N, Li G, Endsley MA, Murray JL, Ferguson MR. Host factors mediating HIV-1 replication. Virus Res 2011; 161:101-14. [PMID: 21871504 DOI: 10.1016/j.virusres.2011.08.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2011] [Revised: 08/05/2011] [Accepted: 08/08/2011] [Indexed: 10/17/2022]
Abstract
Human immunodeficiency virus type 1(HIV-1) infection is the leading cause of death worldwide in adults attributable to infectious diseases. Although the majority of infections are in sub-Saharan Africa and Southeast Asia, HIV-1 is also a major health concern in most countries throughout the globe. While current antiretroviral treatments are generally effective, particularly in combination therapy, limitations exist due to drug resistance occurring among the drug classes. Traditionally, HIV-1 drugs have targeted viral proteins, which are mutable targets. As cellular genes mutate relatively infrequently, host proteins may prove to be more durable targets than viral proteins. HIV-1 replication is dependent upon cellular proteins that perform essential roles during the viral life cycle. Maraviroc is the first FDA-approved antiretroviral drug to target a cellular factor, HIV-1 coreceptor CCR5, and serves to intercept viral-host protein-protein interactions mediating entry. Recent large-scale siRNA and shRNA screens have revealed over 1000 candidate host factors that potentially support HIV-1 replication, and have implicated new pathways in the viral life cycle. These host proteins and cellular pathways may represent important targets for future therapeutic discoveries. This review discusses critical cellular factors that facilitate the successive steps in HIV-1 replication.
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Affiliation(s)
- Brian M Friedrich
- Department of Internal Medicine, Division of Infectious Diseases, University of Texas Medical Branch, Galveston, Texas 77555-0435, United States.
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Sloan RD, Wainberg MA. The role of unintegrated DNA in HIV infection. Retrovirology 2011; 8:52. [PMID: 21722380 PMCID: PMC3148978 DOI: 10.1186/1742-4690-8-52] [Citation(s) in RCA: 108] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Accepted: 07/01/2011] [Indexed: 01/09/2023] Open
Abstract
Integration of the reverse transcribed viral genome into host chromatin is the hallmark of retroviral replication. Yet, during natural HIV infection, various unintegrated viral DNA forms exist in abundance. Though linear viral cDNA is the precursor to an integrated provirus, increasing evidence suggests that transcription and translation of unintegrated DNAs prior to integration may aid productive infection through the expression of early viral genes. Additionally, unintegrated DNA has the capacity to result in preintegration latency, or to be rescued and yield productive infection and so unintegrated DNA, in some circumstances, may be considered to be a viral reservoir. Recently, there has been interest in further defining the role and function of unintegrated viral DNAs, in part because the use of anti-HIV integrase inhibitors leads to an abundance of unintegrated DNA, but also because of the potential use of non-integrating lentiviral vectors in gene therapy and vaccines. There is now increased understanding that unintegrated viral DNA can either arise from, or be degraded through, interactions with host DNA repair enzymes that may represent a form of host antiviral defence. This review focuses on the role of unintegrated DNA in HIV infection and additionally considers the potential implications for antiviral therapy.
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Affiliation(s)
- Richard D Sloan
- McGill University AIDS Centre, Lady Davis Institute, Jewish General Hospital, Montréal, QC, Canada
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