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Kamo T, Kuroda K, Nimura S, Guo Y, Kondo S, Nukaga M, Hoshino T. Development of Inhibitory Compounds for Metallo-beta-lactamase through Computational Design and Crystallographic Analysis. Biochemistry 2024; 63:1278-1286. [PMID: 38690676 DOI: 10.1021/acs.biochem.4c00069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Metallo-β-lactamases (MBL) deactivate β-lactam antibiotics through a catalytic reaction caused by two zinc ions at the active center. Since MBLs deteriorate a wide range of antibiotics, they are dangerous factors for bacterial multidrug resistance. In this work, organic synthesis, computational design, and crystal structure analysis were performed to obtain potent MBL inhibitors based on a previously identified hit compound. The hit compound comprised 3,4-dihydro-2(1H)-quinolinone linked with a phenyl-ether-methyl group via a thiazole ring. In the first step, the thiazole ring was replaced with a tertiary amine to avoid the planar structure. In the second step, we virtually modified the compound by keeping the quinolinone backbone. Every modified compound was bound to a kind of MBL, imipenemase-1 (IMP-1), and the binding pose was optimized by a molecular mechanics calculation. The binding scores were evaluated for the respective optimized binding poses. Given the predicted binding poses and calculated binding scores, candidate compounds were determined for organic syntheses. The inhibitory activities of the synthesized compounds were measured by an in vitro assay for two kinds of MBLs, IMP-1 and New Delhi metallo-β-lactamase (NDM-1). A quinolinone connected with an amine bound with methyl-phenyl-ether-propyl and cyclohexyl-ethyl showed a 50% inhibitory concentration of 4.8 μM. An X-ray crystal analysis clarified the binding structure of a synthesized compound to IMP-1. The δ-lactam ring of quinolinone was hydrolyzed, and the generated carboxyl group was coordinated with zinc ions. The findings on the chemical structure and binding pose are expected to be a base for developing MBL inhibitors.
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Affiliation(s)
- Taichi Kamo
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan
| | - Keiichi Kuroda
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan
| | - Saki Nimura
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan
| | - Yan Guo
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan
| | - Shota Kondo
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan
| | - Michiyoshi Nukaga
- Faculty of Pharmaceutical Sciences, Josai International University, Gumyo, Togane City, Chiba 283-8555, Japan
| | - Tyuji Hoshino
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan
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2
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Putnam WC, Bashkin JK. Oligonucleotides containing abasic threoninol-terpyridine residues as potential artificial ribonucleases. J Inorg Biochem 2022; 232:111831. [DOI: 10.1016/j.jinorgbio.2022.111831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 04/04/2022] [Accepted: 04/11/2022] [Indexed: 11/24/2022]
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3
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Insights into HIV-1 Reverse Transcriptase (RT) Inhibition and Drug Resistance from Thirty Years of Structural Studies. Viruses 2022; 14:v14051027. [PMID: 35632767 PMCID: PMC9148108 DOI: 10.3390/v14051027] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 05/05/2022] [Accepted: 05/06/2022] [Indexed: 02/01/2023] Open
Abstract
The enzyme reverse transcriptase (RT) plays a central role in the life cycle of human immunodeficiency virus (HIV), and RT has been an important drug target. Elucidations of the RT structures trapping and detailing the enzyme at various functional and conformational states by X-ray crystallography have been instrumental for understanding RT activities, inhibition, and drug resistance. The structures have contributed to anti-HIV drug development. Currently, two classes of RT inhibitors are in clinical use. These are nucleoside/nucleotide reverse transcriptase inhibitors (NRTIs) and non-nucleoside reverse transcriptase inhibitors (NNRTIs). However, the error-prone viral replication generates variants that frequently develop resistance to the available drugs, thus warranting a continued effort to seek more effective treatment options. RT also provides multiple additional potential druggable sites. Recently, the use of single-particle cryogenic electron microscopy (cryo-EM) enabled obtaining structures of NNRTI-inhibited HIV-1 RT/dsRNA initiation and RT/dsDNA elongation complexes that were unsuccessful by X-ray crystallography. The cryo-EM platform for the structural study of RT has been established to aid drug design. In this article, we review the roles of structural biology in understanding and targeting HIV RT in the past three decades and the recent structural insights of RT, using cryo-EM.
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4
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Ilina TV, Brosenitsch T, Sluis-Cremer N, Ishima R. Retroviral RNase H: Structure, mechanism, and inhibition. Enzymes 2021; 50:227-247. [PMID: 34861939 DOI: 10.1016/bs.enz.2021.07.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
All retroviruses encode the enzyme, reverse transcriptase (RT), which is involved in the conversion of the single-stranded viral RNA genome into double-stranded DNA. RT is a multifunctional enzyme and exhibits DNA polymerase and ribonuclease H (RNH) activities, both of which are essential to the reverse-transcription process. Despite the successful development of polymerase-targeting antiviral drugs over the last three decades, no bona fide inhibitor against the RNH activity of HIV-1 RT has progressed to clinical evaluation. In this review article, we describe the retroviral RNH function and inhibition, with primary consideration of the structural aspects of inhibition.
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Affiliation(s)
- Tatiana V Ilina
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States
| | - Teresa Brosenitsch
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States
| | - Nicolas Sluis-Cremer
- Department of Medicine, Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States
| | - Rieko Ishima
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States.
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5
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Abstract
Hepatitis B virus (HBV) is a hepatotropic, partially double-stranded DNA virus that replicates by reverse transcription and is a major cause of chronic liver disease and hepatocellular carcinoma. Reverse transcription is catalyzed by the four-domain multifunctional HBV polymerase (P) protein that has protein-priming, RNA- and DNA-dependent DNA synthesis (i.e., reverse transcriptase), and ribonuclease H activities. P also likely promotes the three strand transfers that occur during reverse transcription, and it may participate in immune evasion by HBV. Reverse transcription is primed by a tyrosine residue in the amino-terminal domain of P, and P remains covalently attached to the product DNA throughout reverse transcription. The reverse transcriptase activity of P is the target for the nucleos(t)ide analog drugs that dominate HBV treatment, and P is the target of ongoing efforts to develop new drugs against both the reverse transcriptase and ribonuclease H activities. Despite the unusual reverse transcription pathway catalyzed by P and the importance of P to HBV therapy, understanding the enzymology and structure of HBV P severely lags that of the retroviral reverse transcriptases due to substantial technical challenges to studying the enzyme. Obtaining a better understanding of P will broaden our appreciation of the diversity among reverse transcribing elements in nature, and will help improve treatment for people chronically infected with HBV.
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Affiliation(s)
- Daniel N Clark
- Department of Microbiology, Weber State University, Ogden, UT, United States
| | - Razia Tajwar
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, Saint Louis, MO, United States
| | - Jianming Hu
- Department of Microbiology and Immunology, The Pennsylvania State University College of Medicine, Hershey, PA, United States
| | - John E Tavis
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, Saint Louis, MO, United States.
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6
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Kamo T, Kuroda K, Kondo S, Hayashi U, Fudo S, Yoneda T, Takaya A, Nukaga M, Hoshino T. Identification of the Inhibitory Compounds for Metallo-β-lactamases and Structural Analysis of the Binding Modes. Chem Pharm Bull (Tokyo) 2021; 69:1179-1183. [PMID: 34853284 DOI: 10.1248/cpb.c21-00611] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Metallo-β-lactamases (MBLs) are significant threats to humans because they deteriorate many kinds of β-lactam antibiotics and are key enzymes responsible for multi-drug resistance of bacterial pathogens. As a result of in vitro screening, two compounds were identified as potent inhibitors of two kinds of MBLs: imipenemase (IMP-1) and New Delhi metallo-β-lactamase (NDM-1). The binding structure of one of the identified compounds was clarified by an X-ray crystal analysis in complex with IMP-1, in which two possible binding poses were observed. Molecular dynamics (MD) simulations were performed by building two calculation models from the respective binding poses. The compound was stably bound to the catalytic site during the simulation in one pose. The binding model between NDM-1 and the compound was constructed for MD simulation. Calculation results for NDM-1 were similar to those of IMP-1. The simulation suggested that the binding of the identified inhibitory compound was also durable in the catalytic site of NDM-1. The compound will be a sound basis for the development of the inhibitors for MBLs.
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Affiliation(s)
- Taichi Kamo
- Graduate School of Pharmaceutical Sciences, Chiba University
| | - Keiichi Kuroda
- Graduate School of Pharmaceutical Sciences, Chiba University
| | - Shota Kondo
- Graduate School of Pharmaceutical Sciences, Chiba University
| | - Usaki Hayashi
- Graduate School of Pharmaceutical Sciences, Chiba University
| | - Satoshi Fudo
- HiLIFE (Institute of Biotechnology), University of Helsinki
| | - Tomoki Yoneda
- Division of Applied Chemistry, Graduate School of Engineering, Hokkaido University
| | - Akiko Takaya
- Graduate School of Pharmaceutical Sciences, Chiba University
| | | | - Tyuji Hoshino
- Graduate School of Pharmaceutical Sciences, Chiba University
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7
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Mahboubi-Rabbani M, Abbasi M, Hajimahdi Z, Zarghi A. HIV-1 Reverse Transcriptase/Integrase Dual Inhibitors: A Review of Recent Advances and Structure-activity Relationship Studies. IRANIAN JOURNAL OF PHARMACEUTICAL RESEARCH : IJPR 2021; 20:333-369. [PMID: 34567166 PMCID: PMC8457747 DOI: 10.22037/ijpr.2021.115446.15370] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The significant threat to humanity is HIV infection, and it is uncertain whether a definitive treatment or a safe HIV vaccine is. HIV-1 is continually evolving and resistant to commonly used HIV-resistant medications, presenting significant obstacles to HIV infection management. The drug resistance adds to the need for new anti-HIV drugs; it chooses ingenious approaches to fight the emerging virus. Highly Active Antiretroviral Therapy (HAART), a multi-target approach for specific therapies, has proved effective in AIDS treatment. Therefore, it is a dynamic system with high prescription tension, increased risk of medication reactions, and adverse effects, leading to poor compliance with patients. In the HIV-1 lifecycle, two critical enzymes with high structural and functional analogies are reverse transcriptase (RT) and integrase (IN), which can be interpreted as druggable targets for modern dual-purpose inhibitors. Designed multifunctional ligand (DML) is a new technique that recruited many targets to be achieved by one chemical individual. A single chemical entity that acts for multiple purposes can be much more successful than a complex multidrug program. The production of these multifunctional ligands as antiretroviral drugs is valued with the advantage that the viral-replication process may end in two or more phases. This analysis will discuss the RT-IN dual-inhibitory scaffolds' developments documented so far.
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Affiliation(s)
- Mohammad Mahboubi-Rabbani
- Department of Pharmaceutical Chemistry, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Maryam Abbasi
- Department of Medicinal Chemistry, Faculty of Pharmacy, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | - Zahra Hajimahdi
- Department of Pharmaceutical Chemistry, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Afshin Zarghi
- Department of Pharmaceutical Chemistry, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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8
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Todd B, Tchesnokov EP, Götte M. The active form of the influenza cap-snatching endonuclease inhibitor baloxavir marboxil is a tight binding inhibitor. J Biol Chem 2021; 296:100486. [PMID: 33647314 PMCID: PMC8065212 DOI: 10.1016/j.jbc.2021.100486] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 02/22/2021] [Accepted: 02/25/2021] [Indexed: 12/11/2022] Open
Abstract
Baloxavir marboxil (BXM) is an FDA-approved antiviral prodrug for the treatment of influenza A and B infection and postexposure prophylaxis. The active form, baloxavir acid (BXA), targets the cap-snatching endonuclease (PA) of the influenza virus polymerase complex. The nuclease activity delivers the primer for transcription, and previous reports have shown that BXA blocks the nuclease activity with high potency. However, biochemical studies on the mechanism of action are lacking. Structural data have shown that BXA chelates the two divalent metal ions at the active site, like inhibitors of the human immunodeficiency virus type 1 (HIV-1) integrase or ribonuclease (RNase) H. Here we studied the mechanisms underlying the high potency of BXA and how the I38T mutation confers resistance to the drug. Enzyme kinetics with the recombinant heterotrimeric enzyme (FluB-ht) revealed characteristics of a tight binding inhibitor. The apparent inhibitor constant (Kiapp) is 12 nM, while the I38T mutation increased Kiapp by ∼18-fold. Order-of-addition experiments show that a preformed complex of FluB-ht, Mg2+ ions and BXA is required to observe inhibition, which is consistent with active site binding. Conversely, a preformed complex of FluB-ht and RNA substrate prevents BXA from accessing the active site. Unlike integrase inhibitors that interact with the DNA substrate, BXA behaves like RNase H inhibitors that compete with the nucleic acid at the active site. The collective data support the conclusion that BXA is a tight binding inhibitor and the I38T mutation diminishes these properties.
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Affiliation(s)
- Brendan Todd
- Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada
| | - Egor P Tchesnokov
- Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada
| | - Matthias Götte
- Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada; Li Ka Shing Institute of Virology at University of Alberta, Edmonton, Alberta, Canada.
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9
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Ando T, Jongruja N, Okumura N, Morikawa K, Kanaya S, Takao T. Identification of the ternary complex of ribonuclease HI:RNA/DNA hybrid:metal ions by ESI mass spectrometry. J Biol Chem 2021; 296:100462. [PMID: 33639158 PMCID: PMC8042393 DOI: 10.1016/j.jbc.2021.100462] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 02/14/2021] [Accepted: 02/23/2021] [Indexed: 12/17/2022] Open
Abstract
Ribonuclease HI, an endoribonuclease, catalyzes the hydrolysis of the RNA strand of an RNA/DNA hybrid and requires divalent metal ions for its enzymatic activity. However, the mechanistic details of the activity of ribonuclease HI and its interaction with divalent metal ions remain unclear. In this study, we performed real-time monitoring of the enzyme–substrate complex in the presence of divalent metal ions (Mn2+ or Zn2+) using electrospray ionization–mass spectrometry (ESI-MS). The findings provide clear evidence that the enzymatic activity of the ternary complex requires the binding of two divalent metal ions. The Zn2+ ions bind to both the enzyme itself and the enzyme:substrate complex more strongly than Mn2+ ions, and gives, in part, the ternary complex, [RNase HI:nicked RNA/DNA hybrid:2Zn2+], suggesting that the ternary complex is retained, even after the hydrolysis of the substrate. The collective results presented herein shed new light on the essential role of divalent metal ions in the activity of ribonuclease HI and demonstrate how Zn2+ ions confer inhibitory properties on the activity of this enzyme by forming a highly stable complex with the substrate.
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Affiliation(s)
- Tomoshige Ando
- Institute for Protein Research, Osaka University, Osaka, Japan
| | | | - Nobuaki Okumura
- Institute for Protein Research, Osaka University, Osaka, Japan
| | - Kosuke Morikawa
- Department of Gene Mechanisms, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | | | - Toshifumi Takao
- Institute for Protein Research, Osaka University, Osaka, Japan.
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10
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Cilento ME, Kirby KA, Sarafianos SG. Avoiding Drug Resistance in HIV Reverse Transcriptase. Chem Rev 2021; 121:3271-3296. [PMID: 33507067 DOI: 10.1021/acs.chemrev.0c00967] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
HIV reverse transcriptase (RT) is an enzyme that plays a major role in the replication cycle of HIV and has been a key target of anti-HIV drug development efforts. Because of the high genetic diversity of the virus, mutations in RT can impart resistance to various RT inhibitors. As the prevalence of drug resistance mutations is on the rise, it is necessary to design strategies that will lead to drugs less susceptible to resistance. Here we provide an in-depth review of HIV reverse transcriptase, current RT inhibitors, novel RT inhibitors, and mechanisms of drug resistance. We also present novel strategies that can be useful to overcome RT's ability to escape therapies through drug resistance. While resistance may not be completely avoidable, designing drugs based on the strategies and principles discussed in this review could decrease the prevalence of drug resistance.
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Affiliation(s)
- Maria E Cilento
- Laboratory of Biochemical Pharmacology, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia 30322, United States.,Children's Healthcare of Atlanta, Atlanta, Georgia 30307, United States
| | - Karen A Kirby
- Laboratory of Biochemical Pharmacology, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia 30322, United States.,Children's Healthcare of Atlanta, Atlanta, Georgia 30307, United States
| | - Stefan G Sarafianos
- Laboratory of Biochemical Pharmacology, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia 30322, United States.,Children's Healthcare of Atlanta, Atlanta, Georgia 30307, United States
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11
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Vanangamudi M, Nair PC, Engels SEM, Palaniappan S, Namasivayam V. Structural Insights to Human Immunodeficiency Virus (HIV-1) Targets and Their Inhibition. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1322:63-95. [PMID: 34258737 DOI: 10.1007/978-981-16-0267-2_3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Human immunodeficiency virus (HIV) is a deadly virus that attacks the body's immune system, subsequently leading to AIDS (acquired immunodeficiency syndrome) and ultimately death. Currently, there is no vaccine or effective cure for this infection; however, antiretrovirals that act at various phases of the virus life cycle have been useful to control the viral load in patients. One of the major problems with antiretroviral therapies involves drug resistance. The three-dimensional structure from crystallography studies are instrumental in understanding the structural basis of drug binding to various targets. This chapter provides key insights into different targets and drugs used in the treatment from a structural perspective. Specifically, an insight into the binding characteristics of drugs at the active and allosteric sites of different targets and the importance of targeting allosteric sites for design of new-generation antiretrovirals to overcome complex and resistant forms of the virus has been reviewed.
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Affiliation(s)
- Murugesan Vanangamudi
- Department of Pharmaceutical Chemistry, Amity Institute of Pharmacy, Amity University Gwalior, Gwalior, Madhya Pradesh, India
| | - Pramod C Nair
- Department of Clinical Pharmacology, College of Medicine and Public Health, Flinders University, Adelaide, SA, Australia
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12
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Large Multidomain Protein NMR: HIV-1 Reverse Transcriptase Precursor in Solution. Int J Mol Sci 2020; 21:ijms21249545. [PMID: 33333923 PMCID: PMC7765405 DOI: 10.3390/ijms21249545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Revised: 12/10/2020] [Accepted: 12/12/2020] [Indexed: 11/17/2022] Open
Abstract
NMR studies of large proteins, over 100 kDa, in solution are technically challenging and, therefore, of considerable interest in the biophysics field. The challenge arises because the molecular tumbling of a protein in solution considerably slows as molecular mass increases, reducing the ability to detect resonances. In fact, the typical 1H-13C or 1H-15N correlation spectrum of a large protein, using a 13C- or 15N-uniformly labeled protein, shows severe line-broadening and signal overlap. Selective isotope labeling of methyl groups is a useful strategy to reduce these issues, however, the reduction in the number of signals that goes hand-in-hand with such a strategy is, in turn, disadvantageous for characterizing the overall features of the protein. When domain motion exists in large proteins, the domain motion differently affects backbone amide signals and methyl groups. Thus, the use of multiple NMR probes, such as 1H, 19F, 13C, and 15N, is ideal to gain overall structural or dynamical information for large proteins. We discuss the utility of observing different NMR nuclei when characterizing a large protein, namely, the 66 kDa multi-domain HIV-1 reverse transcriptase that forms a homodimer in solution. Importantly, we present a biophysical approach, complemented by biochemical assays, to understand not only the homodimer, p66/p66, but also the conformational changes that contribute to its maturation to a heterodimer, p66/p51, upon HIV-1 protease cleavage.
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13
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Corona A, Ballana E, Distinto S, Rogolino D, Del Vecchio C, Carcelli M, Badia R, Riveira-Muñoz E, Esposito F, Parolin C, Esté JA, Grandi N, Tramontano E. Targeting HIV-1 RNase H: N'-(2-Hydroxy-benzylidene)-3,4,5-Trihydroxybenzoylhydrazone as Selective Inhibitor Active against NNRTIs-Resistant Variants. Viruses 2020; 12:v12070729. [PMID: 32640577 PMCID: PMC7412550 DOI: 10.3390/v12070729] [Citation(s) in RCA: 5] [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: 04/30/2020] [Revised: 06/28/2020] [Accepted: 07/01/2020] [Indexed: 02/07/2023] Open
Abstract
HIV-1 infection requires life-long treatment and with 2.1 million new infections/year, faces the challenge of an increased rate of transmitted drug-resistant mutations. Therefore, a constant and timely effort is needed to identify new HIV-1 inhibitors active against drug-resistant variants. The ribonuclease H (RNase H) activity of HIV-1 reverse transcriptase (RT) is a very promising target, but to date, still lacks an efficient inhibitor. Here, we characterize the mode of action of N’-(2-hydroxy-benzylidene)-3,4,5-trihydroxybenzoylhydrazone (compound 13), an N-acylhydrazone derivative that inhibited viral replication (EC50 = 10 µM), while retaining full potency against the NNRTI-resistant double mutant K103N-Y181C virus. Time-of-addition and biochemical assays showed that compound 13 targeted the reverse-transcription step in cell-based assays and inhibited the RT-associated RNase H function, being >20-fold less potent against the RT polymerase activity. Docking calculations revealed that compound 13 binds within the RNase H domain in a position different from other selective RNase H inhibitors; site-directed mutagenesis studies revealed interactions with conserved amino acid within the RNase H domain, suggesting that compound 13 can be taken as starting point to generate a new series of more potent RNase H selective inhibitors active against circulating drug-resistant variants.
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Affiliation(s)
- Angela Corona
- Department of Life and Environmental Sciences University of Cagliari, Cittadella Universitaria di Monserrato, 09042 Monserrato, Italy; (S.D.); (F.E.); (N.G.); (E.T.)
- Correspondence: ; Tel.: +39-070-6754530
| | - Ester Ballana
- AIDS Research Institute—IrsiCaixa, 08916 Badalona, Spain; (E.B.); (R.B.); (E.R.-M.); (J.A.E.)
| | - Simona Distinto
- Department of Life and Environmental Sciences University of Cagliari, Cittadella Universitaria di Monserrato, 09042 Monserrato, Italy; (S.D.); (F.E.); (N.G.); (E.T.)
| | - Dominga Rogolino
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, 43124 Parma, Italy; (D.R.); (M.C.)
| | - Claudia Del Vecchio
- Department of Molecular Medicine, University of Padova, 35122 Padova, Italy; (C.D.V.); (C.P.)
| | - Mauro Carcelli
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, 43124 Parma, Italy; (D.R.); (M.C.)
| | - Roger Badia
- AIDS Research Institute—IrsiCaixa, 08916 Badalona, Spain; (E.B.); (R.B.); (E.R.-M.); (J.A.E.)
| | - Eva Riveira-Muñoz
- AIDS Research Institute—IrsiCaixa, 08916 Badalona, Spain; (E.B.); (R.B.); (E.R.-M.); (J.A.E.)
| | - Francesca Esposito
- Department of Life and Environmental Sciences University of Cagliari, Cittadella Universitaria di Monserrato, 09042 Monserrato, Italy; (S.D.); (F.E.); (N.G.); (E.T.)
| | - Cristina Parolin
- Department of Molecular Medicine, University of Padova, 35122 Padova, Italy; (C.D.V.); (C.P.)
| | - José A. Esté
- AIDS Research Institute—IrsiCaixa, 08916 Badalona, Spain; (E.B.); (R.B.); (E.R.-M.); (J.A.E.)
- CienciaTraducida, 08391 Barcelona, Spain
| | - Nicole Grandi
- Department of Life and Environmental Sciences University of Cagliari, Cittadella Universitaria di Monserrato, 09042 Monserrato, Italy; (S.D.); (F.E.); (N.G.); (E.T.)
| | - Enzo Tramontano
- Department of Life and Environmental Sciences University of Cagliari, Cittadella Universitaria di Monserrato, 09042 Monserrato, Italy; (S.D.); (F.E.); (N.G.); (E.T.)
- Istituto di Ricerca Genetica e Biomedica, Consiglio Nazionale delle Ricerche (CNR), 09042 Monserrato, Cagliari, Italy
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14
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Pierra Rouviere C, Dousson CB, Tavis JE. HBV replication inhibitors. Antiviral Res 2020; 179:104815. [PMID: 32380149 PMCID: PMC7293572 DOI: 10.1016/j.antiviral.2020.104815] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 04/22/2020] [Accepted: 04/28/2020] [Indexed: 12/21/2022]
Abstract
Chronic Hepatitis B Virus infections afflict >250 million people and kill nearly 1 million annually. Current non-curative therapies are dominated by nucleos(t)ide analogs (NAs) that profoundly but incompletely suppress DNA synthesis by the viral reverse transcriptase. Residual HBV replication during NA therapy contributes to maintenance of the critical nuclear reservoir of the HBV genome, the covalently-closed circular DNA, and to ongoing infection of naive cells. Identification of next-generation NAs with improved efficacy and safety profiles, often through novel prodrug approaches, is the primary thrust of ongoing efforts to improve HBV replication inhibitors. Inhibitors of the HBV ribonuclease H, the other viral enzymatic activity essential for viral genomic replication, are in preclinical development. The complexity of HBV's reverse transcription pathway offers many other potential targets. HBV's protein-priming of reverse transcription has been briefly explored as a potential target, as have the host chaperones necessary for function of the HBV reverse transcriptase. Improved inhibitors of HBV reverse transcription would reduce HBV's replication-dependent persistence mechanisms and are therefore expected to become a backbone of future curative combination anti-HBV therapies.
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Affiliation(s)
| | - Cyril B Dousson
- Ai-biopharma, Medicinal Chemistry Department, Montpellier, France.
| | - John E Tavis
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, Saint Louis, MO, USA.
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15
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New Subtype B Containing HIV-1 Circulating Recombinant of sub-Saharan Africa Origin in Nigerian Men Who Have Sex With Men. J Acquir Immune Defic Syndr 2020; 81:578-584. [PMID: 31107298 DOI: 10.1097/qai.0000000000002076] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND HIV-1 circulating recombinant forms (CRF) containing subtype B are uncommon in sub-Saharan Africa. Prevalent infections observed during enrollment of a prospective study of men who have sex with men (MSM) from Lagos, Nigeria, revealed the presence of a family of subtype B and CRF02_AG recombinants. This report describes the HIV-1 genetic diversity within a high-risk, high-prevalence, and previously undersampled cohort of Nigerian MSM. METHODS Between 2013 and 2016, 672 MSM were enrolled at the Lagos site of the TRUST/RV368 study. Prevalent HIV-1 infections were initially characterized by pol sequencing and phylogenetic subtyping analysis. Samples demonstrating the presence of subtype B were further characterized by near full-length sequencing, phylogenetic, and Bayesian analyses. RESULTS Within this cohort, HIV-1 prevalence was 59%. The major subtype was CRF02_AG (57%), followed by CRF02/B recombinants (15%), subtype G (13%), and smaller amounts of A1, B, and other recombinants. Nine clusters of closely related pol sequences indicate ongoing transmission events within this cohort. Among the CRF02_AG/B, a new CRF was identified and termed CRF95_02B. Shared risk factors and Bayesian phylogenetic inference of the new CRF95_02B and the similarly structured CRF56_cpx indicate a Nigerian or West African origin of CRF56_cpx before its observation in France. CONCLUSION With high HIV-1 prevalence, new strains, and multiple transmission networks, this cohort of Nigerian MSM represents a previously hidden reservoir of HIV-1 strains, including the newly identified CRF95_02B and closely related CRF56_cpx. These strains will need to be considered during vaccine selection and development to optimize the design of a globally effective HIV-1 vaccine.
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Corona A, Onnis V, Del Vecchio C, Esposito F, Cheng YC, Tramontano E. 2-(Arylamino)-6-(trifluoromethyl)nicotinic Acid Derivatives: New HIV-1 RT Dual Inhibitors Active on Viral Replication. Molecules 2020; 25:E1338. [PMID: 32183488 PMCID: PMC7144554 DOI: 10.3390/molecules25061338] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/11/2020] [Accepted: 03/12/2020] [Indexed: 12/27/2022] Open
Abstract
The persistence of the AIDS epidemic, and the life-long treatment required, indicate the constant need of novel HIV-1 inhibitors. In this scenario the HIV-1 Reverse Transcriptase (RT)-associated ribonuclease H (RNase H) function is a promising drug target. Here we report a series of compounds, developed on the 2-amino-6-(trifluoromethyl)nicotinic acid scaffold, studied as promising RNase H dual inhibitors. Among the 44 tested compounds, 34 inhibited HIV-1 RT-associated RNase H function in the low micromolar range, and seven of them showed also to inhibit viral replication in cell-based assays with a selectivity index up to 10. The most promising compound, 21, inhibited RNase H function with an IC50 of 14 µM and HIV-1 replication in cell-based assays with a selectivity index greater than 10. Mode of action studies revealed that compound 21 is an allosteric dual-site compound inhibiting both HIV-1 RT functions, blocking the polymerase function also in presence of mutations carried by circulating variants resistant to non-nucleoside inhibitors, and the RNase H function interacting with conserved regions within the RNase H domain. Proving compound 21 as a promising lead for the design of new allosteric RNase H inhibitors active against viral replication with not significant cytotoxic effects.
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Affiliation(s)
- Angela Corona
- Department of Life and Environmental Sciences, University of Cagliari, Cittadella Universitaria di Monserrato, 09042 Monserrato, Cagliari, Italy; (A.C.); (V.O.); (F.E.)
| | - Valentina Onnis
- Department of Life and Environmental Sciences, University of Cagliari, Cittadella Universitaria di Monserrato, 09042 Monserrato, Cagliari, Italy; (A.C.); (V.O.); (F.E.)
| | - Claudia Del Vecchio
- Department of Molecular Medicine, University of Padova, 35121 Padova, Italy;
| | - Francesca Esposito
- Department of Life and Environmental Sciences, University of Cagliari, Cittadella Universitaria di Monserrato, 09042 Monserrato, Cagliari, Italy; (A.C.); (V.O.); (F.E.)
| | - Yung-Chi Cheng
- Department of Pharmacology, Yale University Medical School, New Haven, CT 06520-8066, USA;
| | - Enzo Tramontano
- Department of Life and Environmental Sciences, University of Cagliari, Cittadella Universitaria di Monserrato, 09042 Monserrato, Cagliari, Italy; (A.C.); (V.O.); (F.E.)
- Department of Molecular Medicine, University of Padova, 35121 Padova, Italy;
- Department of Pharmacology, Yale University Medical School, New Haven, CT 06520-8066, USA;
- Genetics and Biomedical Research Institute, National Research Council, 09042 Monserrato, Italy
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17
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Wang L, Sarafianos SG, Wang Z. Cutting into the Substrate Dominance: Pharmacophore and Structure-Based Approaches toward Inhibiting Human Immunodeficiency Virus Reverse Transcriptase-Associated Ribonuclease H. Acc Chem Res 2020; 53:218-230. [PMID: 31880912 DOI: 10.1021/acs.accounts.9b00450] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Human immunodeficiency virus (HIV) reverse transcriptase (RT) contains two distinct functional domains: a DNA polymerase (pol) domain and a ribonuclease H (RNase H) domain, both of which are required for viral genome replication. Over the last 3 decades, RT has been at the forefront of HIV drug discovery efforts with numerous nucleoside reverse transcriptase inhibitors (NRTIs) and non-nucleoside reverse transcriptase inhibitors (NNRTIs) approved by the FDA. However, all these RT inhibitors target only the pol function, and inhibitors of RT-associated RNase H have yet to enter the development pipeline, which in itself manifests both the opportunity and challenges of targeting RNase H: if developed, RT RNase H inhibitors would represent a mechanistically novel class of HIV drugs that can be particularly valuable in treating HIV strains resistant to current drugs. The challenges include (1) the difficulty in selectively targeting RT RNase H over RT pol due to their close interplay both spatially and temporally and over HIV-1 integrase strand transfer (INST) activity because of their active site similarities; (2) to a larger extent, the inability of active site inhibitors to confer significant antiviral effect, presumably due to a steep substrate barrier by which the pre-existing substrate prevents access of small molecules to the active site. As a result, previously reported RT RNase H inhibitors typically lacked target specificity and significant antiviral potency. Achieving meaningful antiviral activity via active site targeting likely entails selective and ultrapotent RNase H inhibition to allow small molecules to cut into the dominance of substrates. Based on a pharmacophore model informed by prior work, we designed and redesigned a few metal-chelating chemotypes, such as 2-hydroxyisoquinolinedione (HID), hydroxypyridonecarboxylic acid (HPCA), 3-hydroxypyrimidine-2,4-dione (HPD), and N-hydroxythienopyrimidine-2,4-dione (HTPD). Analogues of these chemotypes generally exhibited improved potency and selectivity inhibiting RT RNase H over the best previous compounds and further validated the pharmacophore model. Extended structure-activity relationship (SAR) on the HPD inhibitor type by mainly altering the linkage generated a few subtypes showing exceptional potency (single-digit nanomolar) and excellent selectivity over the inhibition of RT pol and INST. In parallel, a structure-based approach also allowed us to design a unique double-winged HPD subtype to potently and selectively inhibit RT RNase H and effectively compete against the RNA/DNA substrate. Significantly, all potent HPD subtypes consistently inhibited HIV-1 in the cell culture, suggesting that carefully designed active site RNase H inhibitors with ultrapotency could partially overcome the barrier to antiviral phenotype. Overall, in addition to identifying our own inhibitor types, our medicinal chemistry efforts demonstrated the value of pharmacophore and structure-based approaches in designing active side-directed RNase H inhibitors and could provide a viable path to validating RNase H as a novel antiviral target.
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Affiliation(s)
- Lei Wang
- State Key Laboratory of Fine Chemicals, Department of Pharmacy, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Stefan G. Sarafianos
- Laboratory of Biochemical Pharmacology, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia 30322, United States
| | - Zhengqiang Wang
- Center for Drug Design, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota 55455, United States
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18
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Slack RL, Ilina TV, Xi Z, Giacobbi NS, Kawai G, Parniak MA, Sarafianos SG, Sluis Cremer N, Ishima R. Conformational Changes in HIV-1 Reverse Transcriptase that Facilitate Its Maturation. Structure 2019; 27:1581-1593.e3. [PMID: 31471129 DOI: 10.1016/j.str.2019.08.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 07/10/2019] [Accepted: 08/09/2019] [Indexed: 01/18/2023]
Abstract
HIV-1 reverse transcriptase (RT) is translated as part of the Gag-Pol polyprotein that is proteolytically processed by HIV-1 protease (PR) to finally become a mature heterodimer, composed of a p66 and a p66-derived 51-kDa subunit, p51. Our previous work suggested that tRNALys3 binding to p66/p66 introduces conformational changes in the ribonuclease (RNH) domain of RT that facilitate efficient cleavage of p66 to p51 by PR. In this study, we characterized the conformational changes in the RNH domain of p66/p66 imparted by tRNALys3 using NMR. Moreover, the importance of tRNALys3 in RT maturation was confirmed in cellulo by modulating the levels of Lys-tRNA synthetase, which affects recruitment of tRNALys3 to the virus. We also employed nonnucleoside RT inhibitors, to modulate the p66 dimer-monomer equilibrium and monitor the resulting structural changes. Taken together, our data provide unique insights into the conformational changes in p66/p66 that drive PR cleavage.
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Affiliation(s)
- Ryan L Slack
- Department of Structural Biology, University of Pittsburgh School of Medicine, Room 1037, Biomedical Science Tower 3, 3501 Fifth Avenue, Pittsburgh, PA 15260, USA
| | - Tatiana V Ilina
- Department of Structural Biology, University of Pittsburgh School of Medicine, Room 1037, Biomedical Science Tower 3, 3501 Fifth Avenue, Pittsburgh, PA 15260, USA
| | - Zhaoyong Xi
- Department of Structural Biology, University of Pittsburgh School of Medicine, Room 1037, Biomedical Science Tower 3, 3501 Fifth Avenue, Pittsburgh, PA 15260, USA
| | - Nicholas S Giacobbi
- Department of Medicine, Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Gota Kawai
- Department of Life and Environmental Sciences, Chiba Institute of Technology, Chiba, Japan
| | - Michael A Parniak
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA
| | - Stefan G Sarafianos
- Laboratory of Biochemical Pharmacology, Department of Pediatrics, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Nicolas Sluis Cremer
- Department of Medicine, Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA.
| | - Rieko Ishima
- Department of Structural Biology, University of Pittsburgh School of Medicine, Room 1037, Biomedical Science Tower 3, 3501 Fifth Avenue, Pittsburgh, PA 15260, USA.
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19
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Hyjek M, Figiel M, Nowotny M. RNases H: Structure and mechanism. DNA Repair (Amst) 2019; 84:102672. [PMID: 31371183 DOI: 10.1016/j.dnarep.2019.102672] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 07/05/2019] [Accepted: 07/12/2019] [Indexed: 12/11/2022]
Abstract
RNases H are a family of endonucleases that hydrolyze RNA residues in various nucleic acids. These enzymes are present in all branches of life, and their counterpart domains are also found in reverse transcriptases (RTs) from retroviruses and retroelements. RNases H are divided into two main classes (RNases H1 and H2 or type 1 and type 2 enzymes) with common structural features of the catalytic domain but different range of substrates for enzymatic cleavage. Additionally, a third class is found in some Archaea and bacteria. Besides distinct cellular functions specific for each type of RNases H, this family of proteins is generally involved in the maintenance of genome stability with overlapping and cooperative role in removal of R-loops thus preventing their accumulation. Extensive biochemical and structural studies of RNases H provided not only a comprehensive and complete picture of their mechanism but also revealed key basic principles of nucleic acid recognition and processing. RNase H1 is present in prokaryotes and eukaryotes and cleaves RNA in RNA/DNA hybrids. Its main function is hybrid removal, notably in the context of R-loops. RNase H2, which is also present in all branches of life, can play a similar role but it also has a specialized function in the cleavage of single ribonucleotides embedded in the DNA. RNase H3 is present in Archaea and bacteria and is closely related to RNase H2 in sequence and structure but has RNase H1-like biochemical properties. This review summarizes the mechanisms of substrate recognition and enzymatic cleavage by different classes of RNases H with particular insights into structural features of nucleic acid binding, specificity towards RNA and/or DNA strands and catalysis.
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Affiliation(s)
- Malwina Hyjek
- ProBiostructures, International Institute of Molecular and Cell Biology, Trojdena 4, Warsaw, 02-109, Poland.
| | - Małgorzata Figiel
- Laboratory of Protein Structure, International Institute of Molecular and Cell Biology, Trojdena 4, Warsaw, 02-109, Poland.
| | - Marcin Nowotny
- ProBiostructures, International Institute of Molecular and Cell Biology, Trojdena 4, Warsaw, 02-109, Poland; Laboratory of Protein Structure, International Institute of Molecular and Cell Biology, Trojdena 4, Warsaw, 02-109, Poland.
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20
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Gao P, Cheng X, Sun L, Song S, Álvarez M, Luczkowiak J, Pannecouque C, De Clercq E, Menéndez-Arias L, Zhan P, Liu X. Design, synthesis and biological evaluation of 3-hydroxyquinazoline-2,4(1H,3H)-diones as dual inhibitors of HIV-1 reverse transcriptase-associated RNase H and integrase. Bioorg Med Chem 2019; 27:3836-3845. [PMID: 31324562 DOI: 10.1016/j.bmc.2019.07.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 07/02/2019] [Accepted: 07/05/2019] [Indexed: 11/25/2022]
Abstract
A novel series of 3-hydroxyquinazoline-2,4(1H,3H)-diones derivatives has been designed and synthesized. Their biochemical characterization revealed that most of the compounds were effective inhibitors of HIV-1 RNase H activity at sub to low micromolar concentrations. Among them, II-4 was the most potent in enzymatic assays, showing an IC50 value of 0.41 ± 0.13 μM, almost five times lower than the IC50 obtained with β-thujaplicinol. In addition, II-4 was also effective in inhibiting HIV-1 IN strand transfer activity (IC50 = 0.85 ± 0.18 μM) but less potent than raltegravir (IC50 = 71 ± 14 nM). Despite its relatively low cytotoxicity, the efficiency of II-4 in cell culture was limited by its poor membrane permeability. Nevertheless, structure-activity relationships and molecular modeling studies confirmed the importance of tested 3-hydroxyquinazoline-2,4(1H,3H)-diones as useful leads for further optimization.
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Affiliation(s)
- Ping Gao
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Ji'nan 250012, China
| | - Xiqiang Cheng
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Ji'nan 250012, China
| | - Lin Sun
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Ji'nan 250012, China
| | - Shu Song
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Ji'nan 250012, China
| | - Mar Álvarez
- Centro de Biología Molecular "Severo Ochoa" (Consejo Superior de Investigaciones Científicas & Universidad Autónoma de Madrid), Madrid, Spain
| | - Joanna Luczkowiak
- Centro de Biología Molecular "Severo Ochoa" (Consejo Superior de Investigaciones Científicas & Universidad Autónoma de Madrid), Madrid, Spain
| | - Christophe Pannecouque
- Rega Institute for Medical Research, KU Leuven, Minderbroedersstraat 10, B-3000 Leuven, Belgium
| | - Erik De Clercq
- Rega Institute for Medical Research, KU Leuven, Minderbroedersstraat 10, B-3000 Leuven, Belgium
| | - Luis Menéndez-Arias
- Centro de Biología Molecular "Severo Ochoa" (Consejo Superior de Investigaciones Científicas & Universidad Autónoma de Madrid), Madrid, Spain.
| | - Peng Zhan
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Ji'nan 250012, China.
| | - Xinyong Liu
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Ji'nan 250012, China.
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21
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Wöhrl BM. Structural and Functional Aspects of Foamy Virus Protease-Reverse Transcriptase. Viruses 2019; 11:v11070598. [PMID: 31269675 PMCID: PMC6669543 DOI: 10.3390/v11070598] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 06/28/2019] [Accepted: 06/29/2019] [Indexed: 12/15/2022] Open
Abstract
Reverse transcription describes the process of the transformation of single-stranded RNA into double-stranded DNA via an RNA/DNA duplex intermediate, and is catalyzed by the viral enzyme reverse transcriptase (RT). This event is a pivotal step in the life cycle of all retroviruses. In contrast to orthoretroviruses, the domain structure of the mature RT of foamy viruses is different, i.e., it harbors the protease (PR) domain at its N-terminus, thus being a PR-RT. This structural feature has consequences on PR activation, since the enzyme is monomeric in solution and retroviral PRs are only active as dimers. This review focuses on the structural and functional aspects of simian and prototype foamy virus reverse transcription and reverse transcriptase, as well as special features of reverse transcription that deviate from orthoretroviral processes, e.g., PR activation.
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Affiliation(s)
- Birgitta M Wöhrl
- Lehrstuhl Biopolymere, Universität Bayreuth, D-95440 Bayreuth, Germany.
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22
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Oda M, Xi Z, Inaba S, Slack RL, Ishima R. Binding thermodynamics of metal ions to HIV-1 ribonuclease H domain. JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY 2019; 135:2647-2653. [PMID: 30853849 PMCID: PMC6402781 DOI: 10.1007/s10973-018-7445-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 05/27/2018] [Indexed: 06/09/2023]
Abstract
Metal-protein interactions are not necessarily tight in many transient biological processes, such as cellular signaling, enzyme regulation, and molecular recognition. Here, we analyzed the binding thermodynamics and characterized the structural effect of divalent metal ions, i.e. Mn2+, Zn2+, and Mg2+, to the isolated ribonuclease H (RNH) of human immunodeficiency virus (HIV) using isothermal titration calorimetry (ITC) and circular dichroism. The binding thermodynamics of Mg2+ to RNH was determined using competition ITC experiments, and the binding affinity of Mg2+ was found to be about 40- and 400-times lower than those of Mn2+ and of Zn2+, respectively. The structural analysis showed that Mg2+ binding had little effect on the thermal stability of RNH, while Zn2+ and Mn2+ binding increased the stability. The thermodynamic characteristics of RNH metal binding, compared to intact HIV reverse transcriptase, and a possible mechanism of conformational change induced upon metal ion binding, in correlation with the structure-function relationship, are discussed.
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Affiliation(s)
- Masayuki Oda
- Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, 1-5 Hangi-cho, Shimogamo, Sakyo-ku, Kyoto, Kyoto 606-8522, Japan
| | - Zhaoyong Xi
- Department of Structural Biology, University of Pittsburgh School of, Medicine, Pittsburgh, Pennsylvania 15260, United States
| | - Satomi Inaba
- Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, 1-5 Hangi-cho, Shimogamo, Sakyo-ku, Kyoto, Kyoto 606-8522, Japan
- Research & Utilization Division, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Ryan L. Slack
- Department of Structural Biology, University of Pittsburgh School of, Medicine, Pittsburgh, Pennsylvania 15260, United States
| | - Rieko Ishima
- Department of Structural Biology, University of Pittsburgh School of, Medicine, Pittsburgh, Pennsylvania 15260, United States
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23
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Jun L, Xue-mei S, Min W, Guo-xu C, Jia-qing X. Mechanism of Intramolecular Nucleophilic Substitution in the Catalytic Hydrolysis of Bis(4-Nitrophenyl) Phosphate Ester in a Metallomicelle. PROGRESS IN REACTION KINETICS AND MECHANISM 2019. [DOI: 10.3184/146867806x207627] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A macrocyclic Schiff base ligand and the corresponding Cu(II) and Ni(II) complexes were synthesized and characterized. The catalytic ability of metallomicelles, made from these complexes and micelles, as mimic hydrolytic metalloenzymes, was investigated in the catalytic hydrolysis of bis(p-nitrophenyl) phosphate (BNPP). The rate of the BNPP catalytic reaction in the metallomicelles is ca 2.0 × 106-fold faster than that of the spontaneous hydrolysis of BNPP in aqueous solution under the same conditions. The analysis of absorption spectra of the hydrolytic reaction systems indicates that key intermediates, comprising BNPP and the Ni(II) or Cu(II) complexes, have been formed and the catalytic hydrolysis of BNPP is an intramolecular nucleophilic substitution reaction. Based on the analysis of the absorption spectrum, a mechanism for the catalytic hydrolysis of BNPP has been proposed and a kinetic mathematical model has been established.
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Affiliation(s)
- Li Jun
- College of Bioengineering, Chongqing Institute of Technology, Chongqing, 400050, P.R. China
| | - Sang Xue-mei
- College of Bioengineering, Chongqing Institute of Technology, Chongqing, 400050, P.R. China
| | - Wan Min
- College of Bioengineering, Chongqing Institute of Technology, Chongqing, 400050, P.R. China
| | - Chen Guo-xu
- Department of Applied Oil Engineering, Logistical Engineering University, Chongqing 400016, P.R. China
| | - Xie Jia-qing
- College of Bioengineering, Chongqing Institute of Technology, Chongqing, 400050, P.R. China
- Department of Applied Oil Engineering, Logistical Engineering University, Chongqing 400016, P.R. China
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24
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Erxleben A. Mechanistic Studies of Homo- and Heterodinuclear Zinc Phosphoesterase Mimics: What Has Been Learned? Front Chem 2019; 7:82. [PMID: 30847339 PMCID: PMC6393734 DOI: 10.3389/fchem.2019.00082] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 01/30/2019] [Indexed: 11/13/2022] Open
Abstract
Phosphoesterases hydrolyze the phosphorus oxygen bond of phosphomono-, di- or triesters and are involved in various important biological processes. Carboxylate and/or hydroxido-bridged dizinc(II) sites are a widespread structural motif in this enzyme class. Much effort has been invested to unravel the mechanistic features that provide the enormous rate accelerations observed for enzymatic phosphate ester hydrolysis and much has been learned by using simple low-molecular-weight model systems for the biological dizinc(II) sites. This review summarizes the knowledge and mechanistic understanding of phosphoesterases that has been gained from biomimetic dizinc(II) complexes, showing the power as well as the limitations of model studies.
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Affiliation(s)
- Andrea Erxleben
- School of Chemistry, National University of Ireland Galway, Galway, Ireland
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25
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London RE. HIV-1 Reverse Transcriptase: A Metamorphic Protein with Three Stable States. Structure 2019; 27:420-426. [PMID: 30639227 DOI: 10.1016/j.str.2018.11.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 10/31/2018] [Accepted: 11/27/2018] [Indexed: 11/18/2022]
Abstract
There has been a steadily increasing appreciation of the fact that the relationship between protein sequence and structure is often sufficiently ambiguous to allow a single sequence to adopt alternative, stable folds. Living organisms have been able to utilize such metamorphic proteins in remarkable and unanticipated ways. HIV-1 reverse transcriptase is among the earliest such proteins identified and remains a unique example in which a functional heterodimer contains two, alternatively folded polymerase domains. Structural characterization of the p66 precursor protein combined with NMR spectroscopic and molecular modeling studies have provided insights into the factors underlying the metamorphic transition and the subunit-specific programmed unfolding step required to expose the protease cleavage site within the ribonuclease H domain, supporting the conversion of the p66/p66' precursor into the mature p66/p51 heterodimer.
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Affiliation(s)
- Robert E London
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709, USA.
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26
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Gao Y, Chen Y, Tian Y, Zhao Y, Wu F, Luo X, Ju X, Liu G. In silico study of 3-hydroxypyrimidine-2,4-diones as inhibitors of HIV RT-associated RNase H using molecular docking, molecular dynamics, 3D-QSAR, and pharmacophore models. NEW J CHEM 2019. [DOI: 10.1039/c9nj03353j] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Rational design and virtual screening of novel inhibitors of HIV reverse transcriptase associated ribonuclease H based on a combined molecular modeling study.
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Affiliation(s)
- Ya Gao
- Key Laboratory for Green Chemical Process of Ministry of Education
- School of Chemical Engineering and Pharmacy
- Wuhan Institute of Technology
- Wuhan 430205
- P. R. China
| | - Yanming Chen
- Key Laboratory for Green Chemical Process of Ministry of Education
- School of Chemical Engineering and Pharmacy
- Wuhan Institute of Technology
- Wuhan 430205
- P. R. China
| | - Yafeng Tian
- Key Laboratory for Green Chemical Process of Ministry of Education
- School of Chemical Engineering and Pharmacy
- Wuhan Institute of Technology
- Wuhan 430205
- P. R. China
| | - Yilan Zhao
- Key Laboratory for Green Chemical Process of Ministry of Education
- School of Chemical Engineering and Pharmacy
- Wuhan Institute of Technology
- Wuhan 430205
- P. R. China
| | - Fengshou Wu
- Key Laboratory for Green Chemical Process of Ministry of Education
- School of Chemical Engineering and Pharmacy
- Wuhan Institute of Technology
- Wuhan 430205
- P. R. China
| | - Xiaogang Luo
- Key Laboratory for Green Chemical Process of Ministry of Education
- School of Chemical Engineering and Pharmacy
- Wuhan Institute of Technology
- Wuhan 430205
- P. R. China
| | - Xiulian Ju
- Key Laboratory for Green Chemical Process of Ministry of Education
- School of Chemical Engineering and Pharmacy
- Wuhan Institute of Technology
- Wuhan 430205
- P. R. China
| | - Genyan Liu
- Key Laboratory for Green Chemical Process of Ministry of Education
- School of Chemical Engineering and Pharmacy
- Wuhan Institute of Technology
- Wuhan 430205
- P. R. China
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The Leishmania donovani IMPACT-like protein possesses non-specific nuclease activity. Int J Biol Macromol 2018; 119:962-973. [DOI: 10.1016/j.ijbiomac.2018.07.175] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 07/22/2018] [Accepted: 07/27/2018] [Indexed: 12/22/2022]
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28
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Sun L, Gao P, Dong G, Zhang X, Cheng X, Ding X, Wang X, Daelemans D, De Clercq E, Pannecouque C, Menéndez-Arias L, Zhan P, Liu X. 5-Hydroxypyrido[2,3-b]pyrazin-6(5H)-one derivatives as novel dual inhibitors of HIV-1 reverse transcriptase-associated ribonuclease H and integrase. Eur J Med Chem 2018; 155:714-724. [DOI: 10.1016/j.ejmech.2018.06.036] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Revised: 06/12/2018] [Accepted: 06/13/2018] [Indexed: 11/26/2022]
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29
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Effect of tRNA on the Maturation of HIV-1 Reverse Transcriptase. J Mol Biol 2018; 430:1891-1900. [PMID: 29751015 DOI: 10.1016/j.jmb.2018.02.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 02/21/2018] [Accepted: 02/22/2018] [Indexed: 11/21/2022]
Abstract
The mature HIV-1 reverse transcriptase is a heterodimer that comprises 66 kDa (p66) and 51 kDa (p51) subunits. The latter is formed by HIV-1 protease-catalyzed removal of a C-terminal ribonuclease H domain from a p66 subunit. This proteolytic processing is a critical step in virus maturation and essential for viral infectivity. Here, we report that tRNA significantly enhances in vitro processing even at a substoichiometric tRNA:p66/p66 ratio. Other double-stranded RNAs have considerably less pronounced effect. Our data support a model where interaction of p66/p66 with tRNA introduces conformational asymmetry in the two subunits, permitting specific proteolytic processing of one p66 to provide the mature RT p66/p51 heterodimer.
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30
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Poongavanam V, Corona A, Steinmann C, Scipione L, Grandi N, Pandolfi F, Di Santo R, Costi R, Esposito F, Tramontano E, Kongsted J. Structure-guided approach identifies a novel class of HIV-1 ribonuclease H inhibitors: binding mode insights through magnesium complexation and site-directed mutagenesis studies. MEDCHEMCOMM 2018; 9:562-575. [PMID: 30108947 PMCID: PMC6072344 DOI: 10.1039/c7md00600d] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Accepted: 01/29/2018] [Indexed: 11/21/2022]
Abstract
Persistent HIV infection requires lifelong treatment and among the 2.1 million new HIV infections that occur every year there is an increased rate of transmitted drug-resistant mutations. This fact requires a constant and timely effort in order to identify and develop new HIV inhibitors with innovative mechanisms. The HIV-1 reverse transcriptase (RT) associated ribonuclease H (RNase H) is the only viral encoded enzyme that still lacks an efficient inhibitor despite the fact that it is a well-validated target whose functional abrogation compromises viral infectivity. Identification of new drugs is a long and expensive process that can be speeded up by in silico methods. In the present study, a structure-guided screening is coupled with a similarity-based search on the Specs database to identify a new class of HIV-1 RNase H inhibitors. Out of the 45 compounds selected for experimental testing, 15 inhibited the RNase H function below 100 μM with three hits exhibiting IC50 values <10 μM. The most active compound, AA, inhibits HIV-1 RNase H with an IC50 of 5.1 μM and exhibits a Mg-independent mode of inhibition. Site-directed mutagenesis studies provide valuable insight into the binding mode of newly identified compounds; for instance, compound AA involves extensive interactions with a lipophilic pocket formed by Ala502, Lys503, and Trp (406, 426 and 535) and polar interactions with Arg557 and the highly conserved RNase H primer-grip residue Asn474. The structural insights obtained from this work provide the bases for further lead optimization.
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Affiliation(s)
- Vasanthanathan Poongavanam
- Department of Physics , Chemistry and Pharmacy , University of Southern Denmark , DK-5230 Odense M , Denmark . ;
| | - Angela Corona
- Department of Life and Environmental Sciences , University of Cagliari , Italy .
| | - Casper Steinmann
- Department of Physics , Chemistry and Pharmacy , University of Southern Denmark , DK-5230 Odense M , Denmark . ;
| | - Luigi Scipione
- Dipartimento di Chimica e Tecnologie del Farmaco , Istituto Pasteur-Fondazione Cenci Bolognetti , "Sapienza" Università di Roma , Roma , Italy
| | - Nicole Grandi
- Department of Life and Environmental Sciences , University of Cagliari , Italy .
| | - Fabiana Pandolfi
- Dipartimento di Chimica e Tecnologie del Farmaco , Istituto Pasteur-Fondazione Cenci Bolognetti , "Sapienza" Università di Roma , Roma , Italy
| | - Roberto Di Santo
- Dipartimento di Chimica e Tecnologie del Farmaco , Istituto Pasteur-Fondazione Cenci Bolognetti , "Sapienza" Università di Roma , Roma , Italy
| | - Roberta Costi
- Dipartimento di Chimica e Tecnologie del Farmaco , Istituto Pasteur-Fondazione Cenci Bolognetti , "Sapienza" Università di Roma , Roma , Italy
| | - Francesca Esposito
- Department of Life and Environmental Sciences , University of Cagliari , Italy .
| | - Enzo Tramontano
- Department of Life and Environmental Sciences , University of Cagliari , Italy .
- Istituto di Ricerca Genetica e Biomedica , Consiglio Nazionale delle Ricerche (CNR) , Monserrato(CA) , Italy
| | - Jacob Kongsted
- Department of Physics , Chemistry and Pharmacy , University of Southern Denmark , DK-5230 Odense M , Denmark . ;
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31
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Korolev SP, Pustovarova MA, Starosotnikov AM, Bastrakov MA, Agapkina YY, Shevelev SA, Gottikh MB. Nitrobenzofuroxane derivatives as dual action HIV-1 inhibitors. BIOCHEMISTRY (MOSCOW), SUPPLEMENT SERIES B: BIOMEDICAL CHEMISTRY 2017. [DOI: 10.1134/s1990750817030064] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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32
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Pandey AK, Dixit U, Kholodovych V, Comollo TW, Pandey VN. The β1′−β2′ Motif of the RNase H Domain of Human Immunodeficiency Virus Type 1 Reverse Transcriptase Is Responsible for Conferring Open Conformation to the p66 Subunit by Displacing the Connection Domain from the Polymerase Cleft. Biochemistry 2017. [PMID: 28627879 DOI: 10.1021/acs.biochem.7b00005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ashutosh K Pandey
- Department
of Microbiology, Biochemistry and Molecular Genetics, New Jersey Medical
School, Rutgers University-Newark, Newark, New Jersey 07103, United States
| | - Updesh Dixit
- Department
of Microbiology, Biochemistry and Molecular Genetics, New Jersey Medical
School, Rutgers University-Newark, Newark, New Jersey 07103, United States
| | - Vlad Kholodovych
- Office
of Advanced Research Computing, Rutgers University, Piscataway, New Jersey 08854, United States
- Department
of Pharmacology, Robert Wood Johnson Medical School, Rutgers University, Piscataway, New Jersey 08854, United States
| | - Thomas W. Comollo
- Department
of Microbiology, Biochemistry and Molecular Genetics, New Jersey Medical
School, Rutgers University-Newark, Newark, New Jersey 07103, United States
| | - Virendra N. Pandey
- Department
of Microbiology, Biochemistry and Molecular Genetics, New Jersey Medical
School, Rutgers University-Newark, Newark, New Jersey 07103, United States
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33
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Korolev SP, Zatsepin TS, Gottikh MB. Oligonucleotide inhibitors of HIV-1 integrase efficiently inhibit HIV-1 reverse transcriptase. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2017. [DOI: 10.1134/s1068162017020078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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34
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Korolev SP, Pustovarova MA, Starosotnikov AM, Bastrakov MA, Agapkina YY, Shevelev SA, Gottikh MB. [Nitrobenzofuroxane derivatives as dual action hiv-1 inhibitors]. BIOMEDIT︠S︡INSKAI︠A︡ KHIMII︠A︡ 2016; 62:725-728. [PMID: 28026819 DOI: 10.18097/pbmc20166206725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Human immunodeficiency virus first type (HIV-1) is a main cause of one of the most dangerous diseases, AIDS. The search for new inhibitors of the virus still remains an urgent task. One approach to suppress the HIV infection is to use a double-acting inhibitors, i.e. inhibitors directed to two stages of the viral life cycle. The catalytic domain of HIV-1 integrase has a similar spatial organization with ribonuclease (RNase H) domain of HIV-1 reverse transcriptase, and approach aimed to create HIV-1 integrase and RNase H double-acting is very promising. In this work we synthesized a series of 6-nitrobenzofuroxane derivatives and studied their ability to inhibit two viral enzymes - integrase and RNase H HIV-1.
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Affiliation(s)
- S P Korolev
- Belozeksky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - M A Pustovarova
- Belozeksky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | | | - M A Bastrakov
- Zelinsky Institute of Organic Chemistry, Moscow, Russia
| | - Yu Yu Agapkina
- Belozeksky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - S A Shevelev
- Zelinsky Institute of Organic Chemistry, Moscow, Russia
| | - M B Gottikh
- Belozeksky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
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35
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Karki I, Christen MT, Spiriti J, Slack RL, Oda M, Kanaori K, Zuckerman DM, Ishima R. Entire-Dataset Analysis of NMR Fast-Exchange Titration Spectra: A Mg 2+ Titration Analysis for HIV-1 Ribonuclease H Domain. J Phys Chem B 2016; 120:12420-12431. [PMID: 27973819 DOI: 10.1021/acs.jpcb.6b08323] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This article communicates our study to elucidate the molecular determinants of weak Mg2+ interaction with the ribonuclease H (RNH) domain of HIV-1 reverse transcriptase in solution. As the interaction is weak (a ligand-dissociation constant >1 mM), nonspecific Mg2+ interaction with the protein or interaction of the protein with other solutes that are present in the buffer solution can confound the observed Mg2+-titration data. To investigate these indirect effects, we monitored changes in the chemical shifts of backbone amides of RNH by recording NMR 1H-15N heteronuclear single-quantum coherence spectra upon titration of Mg2+ into an RNH solution. We performed the titration under three different conditions: (1) in the absence of NaCl, (2) in the presence of 50 mM NaCl, and (3) at a constant 160 mM Cl- concentration. Careful analysis of these three sets of titration data, along with molecular dynamics simulation data of RNH with Na+ and Cl- ions, demonstrates two characteristic phenomena distinct from the specific Mg2+ interaction with the active site: (1) weak interaction of Mg2+, as a salt, with the substrate-handle region of the protein and (2) overall apparent lower Mg2+ affinity in the absence of NaCl compared to that in the presence of 50 mM NaCl. A possible explanation may be that the titrated MgCl2 is consumed as a salt and interacts with RNH in the absence of NaCl. In addition, our data suggest that Na+ increases the kinetic rate of the specific Mg2+ interaction at the active site of RNH. Taken together, our study provides biophysical insight into the mechanism of weak metal interaction on a protein.
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Affiliation(s)
- Ichhuk Karki
- Department of Structural Biology and ‡Department of Computational and Systems Biology, University of Pittsburgh School of Medicine , Pittsburgh, Pennsylvania 15260, United States.,Graduate School of Life and Environmental Sciences, Kyoto Prefectural University and ⊥Department of Biomolecular Engineering, Kyoto Institute of Technology , Kyoto 606, Japan
| | - Martin T Christen
- Department of Structural Biology and ‡Department of Computational and Systems Biology, University of Pittsburgh School of Medicine , Pittsburgh, Pennsylvania 15260, United States.,Graduate School of Life and Environmental Sciences, Kyoto Prefectural University and ⊥Department of Biomolecular Engineering, Kyoto Institute of Technology , Kyoto 606, Japan
| | - Justin Spiriti
- Department of Structural Biology and ‡Department of Computational and Systems Biology, University of Pittsburgh School of Medicine , Pittsburgh, Pennsylvania 15260, United States.,Graduate School of Life and Environmental Sciences, Kyoto Prefectural University and ⊥Department of Biomolecular Engineering, Kyoto Institute of Technology , Kyoto 606, Japan
| | - Ryan L Slack
- Department of Structural Biology and ‡Department of Computational and Systems Biology, University of Pittsburgh School of Medicine , Pittsburgh, Pennsylvania 15260, United States.,Graduate School of Life and Environmental Sciences, Kyoto Prefectural University and ⊥Department of Biomolecular Engineering, Kyoto Institute of Technology , Kyoto 606, Japan
| | - Masayuki Oda
- Department of Structural Biology and ‡Department of Computational and Systems Biology, University of Pittsburgh School of Medicine , Pittsburgh, Pennsylvania 15260, United States.,Graduate School of Life and Environmental Sciences, Kyoto Prefectural University and ⊥Department of Biomolecular Engineering, Kyoto Institute of Technology , Kyoto 606, Japan
| | - Kenji Kanaori
- Department of Structural Biology and ‡Department of Computational and Systems Biology, University of Pittsburgh School of Medicine , Pittsburgh, Pennsylvania 15260, United States.,Graduate School of Life and Environmental Sciences, Kyoto Prefectural University and ⊥Department of Biomolecular Engineering, Kyoto Institute of Technology , Kyoto 606, Japan
| | - Daniel M Zuckerman
- Department of Structural Biology and ‡Department of Computational and Systems Biology, University of Pittsburgh School of Medicine , Pittsburgh, Pennsylvania 15260, United States.,Graduate School of Life and Environmental Sciences, Kyoto Prefectural University and ⊥Department of Biomolecular Engineering, Kyoto Institute of Technology , Kyoto 606, Japan
| | - Rieko Ishima
- Department of Structural Biology and ‡Department of Computational and Systems Biology, University of Pittsburgh School of Medicine , Pittsburgh, Pennsylvania 15260, United States.,Graduate School of Life and Environmental Sciences, Kyoto Prefectural University and ⊥Department of Biomolecular Engineering, Kyoto Institute of Technology , Kyoto 606, Japan
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36
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Sharaf NG, Brereton AE, Byeon IJL, Karplus PA, Gronenborn AM. NMR structure of the HIV-1 reverse transcriptase thumb subdomain. JOURNAL OF BIOMOLECULAR NMR 2016; 66:273-280. [PMID: 27858311 PMCID: PMC5218889 DOI: 10.1007/s10858-016-0077-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 11/09/2016] [Indexed: 06/06/2023]
Abstract
The solution NMR structure of the isolated thumb subdomain of HIV-1 reverse transcriptase (RT) has been determined. A detailed comparison of the current structure with dozens of the highest resolution crystal structures of this domain in the context of the full-length enzyme reveals that the overall structures are very similar, with only two regions exhibiting local conformational differences. The C-terminal capping pattern of the αH helix is subtly different, and the loop connecting the αI and αJ helices in the p51 chain of the full-length p51/p66 heterodimeric RT differs from our NMR structure due to unique packing interactions in mature RT. Overall, our data show that the thumb subdomain folds independently and essentially the same in isolation as in its natural structural context.
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Affiliation(s)
- Naima G Sharaf
- Department of Structural Biology and Pittsburgh Center for HIV Protein Interactions, University of Pittsburgh, School of Medicine, Biomedical Science Tower 3, 3501 Fifth Avenue, Pittsburgh, PA, 15260, USA
| | - Andrew E Brereton
- Department of Biochemistry and Biophysics, 2011 Ag & Life Sciences Bldg, Oregon State University, Corvallis, OR, 97331, USA
| | - In-Ja L Byeon
- Department of Structural Biology and Pittsburgh Center for HIV Protein Interactions, University of Pittsburgh, School of Medicine, Biomedical Science Tower 3, 3501 Fifth Avenue, Pittsburgh, PA, 15260, USA
| | - P Andrew Karplus
- Department of Biochemistry and Biophysics, 2011 Ag & Life Sciences Bldg, Oregon State University, Corvallis, OR, 97331, USA
| | - Angela M Gronenborn
- Department of Structural Biology and Pittsburgh Center for HIV Protein Interactions, University of Pittsburgh, School of Medicine, Biomedical Science Tower 3, 3501 Fifth Avenue, Pittsburgh, PA, 15260, USA.
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37
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Zhang B, D’Erasmo M, Murelli RP, Gallicchio E. Free Energy-Based Virtual Screening and Optimization of RNase H Inhibitors of HIV-1 Reverse Transcriptase. ACS OMEGA 2016; 1:435-447. [PMID: 27713931 PMCID: PMC5046171 DOI: 10.1021/acsomega.6b00123] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 09/07/2016] [Indexed: 06/06/2023]
Abstract
We report the results of a binding free energy-based virtual screening campaign of a library of 77 α-hydroxytropolone derivatives against the challenging RNase H active site of the reverse transcriptase (RT) enzyme of human immunodeficiency virus-1. Multiple protonation states, rotamer states, and binding modalities of each compound were individually evaluated. The work involved more than 300 individual absolute alchemical binding free energy parallel molecular dynamics calculations and over 1 million CPU hours on national computing clusters and a local campus computational grid. The thermodynamic and structural measures obtained in this work rationalize a series of characteristics of this system useful for guiding future synthetic and biochemical efforts. The free energy model identified key ligand-dependent entropic and conformational reorganization processes difficult to capture using standard docking and scoring approaches. Binding free energy-based optimization of the lead compounds emerging from the virtual screen has yielded four compounds with very favorable binding properties, which will be the subject of further experimental investigations. This work is one of the few reported applications of advanced-binding free energy models to large-scale virtual screening and optimization projects. It further demonstrates that, with suitable algorithms and automation, advanced-binding free energy models can have a useful role in early-stage drug-discovery programs.
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Affiliation(s)
- Baofeng Zhang
- Department
of Chemistry, Brooklyn
College, City University of New York, Brooklyn, New York 11210, United States
| | - Michael
P. D’Erasmo
- Department
of Chemistry, Brooklyn
College, City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry and Ph.D. Program in
Biochemistry, The Graduate Center of the
City University of New York, New
York, New York 10016, United States
| | - Ryan P. Murelli
- Department
of Chemistry, Brooklyn
College, City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry and Ph.D. Program in
Biochemistry, The Graduate Center of the
City University of New York, New
York, New York 10016, United States
| | - Emilio Gallicchio
- Department
of Chemistry, Brooklyn
College, City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry and Ph.D. Program in
Biochemistry, The Graduate Center of the
City University of New York, New
York, New York 10016, United States
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38
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Structural Maturation of HIV-1 Reverse Transcriptase-A Metamorphic Solution to Genomic Instability. Viruses 2016; 8:v8100260. [PMID: 27690082 PMCID: PMC5086598 DOI: 10.3390/v8100260] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 09/12/2016] [Indexed: 12/13/2022] Open
Abstract
Human immunodeficiency virus 1 (HIV-1) reverse transcriptase (RT)—a critical enzyme of the viral life cycle—undergoes a complex maturation process, required so that a pair of p66 precursor proteins can develop conformationally along different pathways, one evolving to form active polymerase and ribonuclease H (RH) domains, while the second forms a non-functional polymerase and a proteolyzed RH domain. These parallel maturation pathways rely on the structural ambiguity of a metamorphic polymerase domain, for which the sequence–structure relationship is not unique. Recent nuclear magnetic resonance (NMR) studies utilizing selective labeling techniques, and structural characterization of the p66 monomer precursor have provided important insights into the details of this maturation pathway, revealing many aspects of the three major steps involved: (1) domain rearrangement; (2) dimerization; and (3) subunit-selective RH domain proteolysis. This review summarizes the major structural changes that occur during the maturation process. We also highlight how mutations, often viewed within the context of the mature RT heterodimer, can exert a major influence on maturation and dimerization. It is further suggested that several steps in the RT maturation pathway may provide attractive targets for drug development.
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39
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Baertschi SW, Cantrell AS, Kuhfeld MT, Lorenz U, Boyd DB, Jaskunas SR. Inhibition of Human Immunodeficiency Virus Type 1 Reverse Transcriptase by Degradation Products of Ceftazidime. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/095632029700800408] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Previous work by Hafkemeyer et al. (1991) [ Nucleic Acids Research19: 4059–4065] indicated that a degradation product of ceftazidime, termed HP 0.35, was active against the RNase H activity of human immunodeficiency virus type 1 (HIV-1) and feline immunodeficiency virus (FIV) reverse transcriptase (RT) in vitro. Attempting to repeat these results, we isolated HP 0.35 from an aqueous degradation of ceftazidime and, after careful purification, we found HP 0.35 to be essentially inactive against both the polymerase and RNase H domains of HIV-1 RT (IC50 of >100 μg mL−1). During the investigation we discovered that polymeric degradation products of ceftazidime inhibited both the polymerase and, to a greater extent, the RNase H activities of HIV-1 RT in vitro (IC50 approximately 0.1 and 0.01 μg mL−1, respectively). Subjecting HP 0.35 to conditions under which it could polymerize induced inhibitory activity similar to that of the polymeric ceftazidime degradation products. It is proposed that the previously reported activity of HP 0.35 may have resulted from the presence of low levels of polymeric material either from incomplete purification or from polymerization of HP 0.35 during storage or in vitro testing.
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Affiliation(s)
- SW Baertschi
- Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN 46285-3811, USA
| | - AS Cantrell
- Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN 46285-3811, USA
| | - MT Kuhfeld
- Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN 46285-3811, USA
| | - U Lorenz
- Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN 46285-3811, USA
| | - DB Boyd
- Department of Chemistry, Indiana University—Purdue University at Indianapolis, Indianapolis, IN 46202-3274, USA
| | - SR Jaskunas
- Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN 46285-3811, USA
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40
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Levantis P, Stein C, Oxford J. Molecular and Biological Aspects of AZT Resistant Viruses Derived from HIV-1 Infected Individuals. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/095632029300400301] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- P. Levantis
- Department of Academic Virology, London Hospital Medical College, Turner Street, London E1 2AD, UK
| | - C. Stein
- Department of Academic Virology, London Hospital Medical College, Turner Street, London E1 2AD, UK
| | - J. Oxford
- Department of Academic Virology, London Hospital Medical College, Turner Street, London E1 2AD, UK
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41
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Rausch JW, Grice SFJL. Reverse Transcriptase-Associated Ribonuclease H Activity as a Target for Antiviral Chemotherapy. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/095632029700800301] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The availability of highly purified recombinant enzymes and model heteropolymeric nucleic acid substrates now allows more precise evaluation of the ribonuclease H (RNase H) activity associated with human immunodeficiency virus (HIV) reverse transcriptase. In addition to degrading the RNA–DNA replicative intermediate, this C-terminal domain of around 130 residues supports highly specialized events that cannot be complemented by host-coded enzymes during retrovirus replication. RNase H activity should therefore be considered a plausible candidate for therapeutic intervention. Events during HIV replication requiring precise RNase H-mediated hydrolysis, the methodologies available to study these events, and their potential for therapeutic intervention are reviewed here.
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Affiliation(s)
- JW Rausch
- Center For AIDS Research and Division of Infectious Diseases, Case Western Reserve University School of Medicine, 10900 Euclid Avenue, Cleveland, OH 44106-4984, USA
| | - SFJ Le Grice
- Center For AIDS Research and Division of Infectious Diseases, Case Western Reserve University School of Medicine, 10900 Euclid Avenue, Cleveland, OH 44106-4984, USA
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42
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Zheng X, Pedersen LC, Gabel SA, Mueller GA, DeRose EF, London RE. Unfolding the HIV-1 reverse transcriptase RNase H domain--how to lose a molecular tug-of-war. Nucleic Acids Res 2016; 44:1776-88. [PMID: 26773054 PMCID: PMC4770237 DOI: 10.1093/nar/gkv1538] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 12/24/2015] [Indexed: 11/14/2022] Open
Abstract
Formation of the mature HIV-1 reverse transcriptase (RT) p66/p51 heterodimer requires subunit-specific processing of the p66/p66' homodimer precursor. Since the ribonuclease H (RH) domain contains an occult cleavage site located near its center, cleavage must occur either prior to folding or subsequent to unfolding. Recent NMR studies have identified a slow, subunit-specific RH domain unfolding process proposed to result from a residue tug-of-war between the polymerase and RH domains on the functionally inactive, p66' subunit. Here, we describe a structural comparison of the isolated RH domain with a domain swapped RH dimer that reveals several intrinsically destabilizing characteristics of the isolated domain that facilitate excursions of Tyr427 from its binding pocket and separation of helices B and D. These studies provide independent support for the subunit-selective RH domain unfolding pathway in which instability of the Tyr427 binding pocket facilitates its release followed by domain transfer, acting as a trigger for further RH domain destabilization and subsequent unfolding. As further support for this pathway, NMR studies demonstrate that addition of an RH active site-directed isoquinolone ligand retards the subunit-selective RH' domain unfolding behavior of the p66/p66' homodimer. This study demonstrates the feasibility of directly targeting RT maturation with therapeutics.
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Affiliation(s)
- Xunhai Zheng
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental health Sciences, NIH, Research Triangle Park, NC 27709, USA
| | - Lars C Pedersen
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental health Sciences, NIH, Research Triangle Park, NC 27709, USA
| | - Scott A Gabel
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental health Sciences, NIH, Research Triangle Park, NC 27709, USA
| | - Geoffrey A Mueller
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental health Sciences, NIH, Research Triangle Park, NC 27709, USA
| | - Eugene F DeRose
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental health Sciences, NIH, Research Triangle Park, NC 27709, USA
| | - Robert E London
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental health Sciences, NIH, Research Triangle Park, NC 27709, USA
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43
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Abstract
This review provides a description of the known Escherichia coli ribonucleases (RNases), focusing on their structures, catalytic properties, genes, physiological roles, and possible regulation. Currently, eight E. coli exoribonucleases are known. These are RNases II, R, D, T, PH, BN, polynucleotide phosphorylase (PNPase), and oligoribonuclease (ORNase). Based on sequence analysis and catalytic properties, the eight exoribonucleases have been grouped into four families. These are the RNR family, including RNase II and RNase R; the DEDD family, including RNase D, RNase T, and ORNase; the RBN family, consisting of RNase BN; and the PDX family, including PNPase and RNase PH. Seven well-characterized endoribonucleases are known in E. coli. These are RNases I, III, P, E, G, HI, and HII. Homologues to most of these enzymes are also present in Salmonella. Most of the endoribonucleases cleave RNA in the presence of divalent cations, producing fragments with 3'-hydroxyl and 5'-phosphate termini. RNase H selectively hydrolyzes the RNA strand of RNA?DNA hybrids. Members of the RNase H family are widely distributed among prokaryotic and eukaryotic organisms in three distinct lineages, RNases HI, HII, and HIII. It is likely that E. coli contains additional endoribonucleases that have not yet been characterized. First of all, endonucleolytic activities are needed for certain known processes that cannot be attributed to any of the known enzymes. Second, homologues of known endoribonucleases are present in E. coli. Third, endonucleolytic activities have been observed in cell extracts that have different properties from known enzymes.
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Gogineni V, Schinazi RF, Hamann MT. Role of Marine Natural Products in the Genesis of Antiviral Agents. Chem Rev 2015; 115:9655-706. [PMID: 26317854 PMCID: PMC4883660 DOI: 10.1021/cr4006318] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Vedanjali Gogineni
- Department of Pharmacognosy, Pharmacology, Chemistry & Biochemistry, University of Mississippi, School of Pharmacy, University, Mississippi 38677, United States
| | - Raymond F. Schinazi
- Center for AIDS Research, Department of Pediatrics, Emory University/Veterans Affairs Medical Center, 1760 Haygood Drive NE, Atlanta, Georgia 30322, United States
| | - Mark T. Hamann
- Department of Pharmacognosy, Pharmacology, Chemistry & Biochemistry, University of Mississippi, School of Pharmacy, University, Mississippi 38677, United States
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Slack RL, Spiriti J, Ahn J, Parniak MA, Zuckerman DM, Ishima R. Structural integrity of the ribonuclease H domain in HIV-1 reverse transcriptase. Proteins 2015; 83:1526-38. [PMID: 26061827 DOI: 10.1002/prot.24843] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Revised: 05/14/2015] [Accepted: 06/03/2015] [Indexed: 02/06/2023]
Abstract
The mature form of reverse transcriptase (RT) is a heterodimer comprising the intact 66-kDa subunit (p66) and a smaller 51-kDa subunit (p51) that is generated by removal of most of the RNase H (RNH) domain from a p66 subunit by proteolytic cleavage between residues 440 and 441. Viral infectivity is eliminated by mutations such as F440A and E438N in the proteolytic cleavage sequence, while normal processing and virus infectivity are restored by a compensatory mutation, T477A, that is located more than 10 Å away from the processing site. The molecular basis for this compensatory effect has remained unclear. We therefore investigated structural characteristics of RNH mutants using computational and experimental approaches. Our Nuclear Magnetic Resonance and Differential Scanning Fluorimetry results show that both F440A and E438N mutations disrupt RNH folding. Addition of the T477A mutation restores correct folding of the RNH domain despite the presence of the F440A or E438N mutations. Molecular dynamics simulations suggest that the T477A mutation affects the processing site by altering relative orientations of secondary structure elements. Predictions of sequence tolerance suggest that phenylalanine and tyrosine are structurally preferred at residues 440 and 441, respectively, which are the P1 and P1' substrate residues known to require bulky side chains for substrate specificity. Interestingly, our study demonstrates that the processing site residues, which are critical for protease substrate specificity and must be exposed to the solvent for efficient processing, also function to maintain proper RNH folding in the p66/p51 heterodimer.
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Affiliation(s)
- Ryan L Slack
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, 15260
| | - Justin Spiriti
- Department of Computational and Systems Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, 15260
| | - Jinwoo Ahn
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, 15260
| | - Michael A Parniak
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, 15260
| | - Daniel M Zuckerman
- Department of Computational and Systems Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, 15260
| | - Rieko Ishima
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, 15260
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Pescatori L, Métifiot M, Chung S, Masoaka T, Cuzzucoli Crucitti G, Messore A, Pupo G, Madia VN, Saccoliti F, Scipione L, Tortorella S, Di Leva FS, Cosconati S, Marinelli L, Novellino E, Le Grice SFJ, Pommier Y, Marchand C, Costi R, Di Santo R. N-Substituted Quinolinonyl Diketo Acid Derivatives as HIV Integrase Strand Transfer Inhibitors and Their Activity against RNase H Function of Reverse Transcriptase. J Med Chem 2015; 58:4610-23. [PMID: 25961960 DOI: 10.1021/acs.jmedchem.5b00159] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Bifunctional quinolinonyl DKA derivatives were first described as nonselective inhibitors of 3'-processing (3'-P) and strand transfer (ST) functions of HIV-1 integrase (IN), while 7-aminosubstituted quinolinonyl derivatives were proven IN strand transfer inhibitors (INSTIs) that also displayed activity against ribonuclease H (RNase H). In this study, we describe the design, synthesis, and biological evaluation of new quinolinonyl diketo acid (DKA) derivatives characterized by variously substituted alkylating groups on the nitrogen atom of the quinolinone ring. Removal of the second DKA branch of bifunctional DKAs, and the amino group in position 7 of quinolinone ring combined with a fine-tuning of the substituents on the benzyl group in position 1 of the quinolinone, increased selectivity for IN ST activity. In vitro, the most potent compound was 11j (IC50 = 10 nM), while the most active compounds against HIV infected cells were ester derivatives 10j and 10l. In general, the activity against RNase H was negligible, with only a few compounds active at concentrations higher than 10 μM. The binding mode of the most potent IN inhibitor 11j within the IN catalytic core domain (CCD) is described as well as its binding mode within the RNase H catalytic site to rationalize its selectivity.
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Affiliation(s)
- Luca Pescatori
- †Dipartimento di Chimica e Tecnologie del Farmaco, Istituto Pasteur-Fondazione Cenci Bolognetti, "Sapienza" Università di Roma, P-le Aldo Moro 5, I-00185, Roma, Italy
| | - Mathieu Métifiot
- ‡Laboratory of Molecular Pharmacology and Developmental Therapeutic Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Building 37, Room 5068, Bethesda, Maryland 20892-4255, United States
| | - Suhman Chung
- §Resistance Mechanisms Laboratory, HIV Drug Resistance Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, Maryland 21702, United States
| | - Takashi Masoaka
- §Resistance Mechanisms Laboratory, HIV Drug Resistance Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, Maryland 21702, United States
| | - Giuliana Cuzzucoli Crucitti
- †Dipartimento di Chimica e Tecnologie del Farmaco, Istituto Pasteur-Fondazione Cenci Bolognetti, "Sapienza" Università di Roma, P-le Aldo Moro 5, I-00185, Roma, Italy
| | - Antonella Messore
- †Dipartimento di Chimica e Tecnologie del Farmaco, Istituto Pasteur-Fondazione Cenci Bolognetti, "Sapienza" Università di Roma, P-le Aldo Moro 5, I-00185, Roma, Italy
| | - Giovanni Pupo
- †Dipartimento di Chimica e Tecnologie del Farmaco, Istituto Pasteur-Fondazione Cenci Bolognetti, "Sapienza" Università di Roma, P-le Aldo Moro 5, I-00185, Roma, Italy
| | - Valentina Noemi Madia
- †Dipartimento di Chimica e Tecnologie del Farmaco, Istituto Pasteur-Fondazione Cenci Bolognetti, "Sapienza" Università di Roma, P-le Aldo Moro 5, I-00185, Roma, Italy
| | - Francesco Saccoliti
- †Dipartimento di Chimica e Tecnologie del Farmaco, Istituto Pasteur-Fondazione Cenci Bolognetti, "Sapienza" Università di Roma, P-le Aldo Moro 5, I-00185, Roma, Italy
| | - Luigi Scipione
- †Dipartimento di Chimica e Tecnologie del Farmaco, Istituto Pasteur-Fondazione Cenci Bolognetti, "Sapienza" Università di Roma, P-le Aldo Moro 5, I-00185, Roma, Italy
| | - Silvano Tortorella
- †Dipartimento di Chimica e Tecnologie del Farmaco, Istituto Pasteur-Fondazione Cenci Bolognetti, "Sapienza" Università di Roma, P-le Aldo Moro 5, I-00185, Roma, Italy
| | - Francesco Saverio Di Leva
- ∥Dipartimento di Farmacia, Università di Napoli "Federico II", Via D. Montesano 49, 80131 Napoli, Italy
| | - Sandro Cosconati
- ⊥DiSTABiF, Seconda Università di Napoli, Via Vivaldi 43, 81100 Caserta, Italy
| | - Luciana Marinelli
- ∥Dipartimento di Farmacia, Università di Napoli "Federico II", Via D. Montesano 49, 80131 Napoli, Italy
| | - Ettore Novellino
- ∥Dipartimento di Farmacia, Università di Napoli "Federico II", Via D. Montesano 49, 80131 Napoli, Italy
| | - Stuart F J Le Grice
- §Resistance Mechanisms Laboratory, HIV Drug Resistance Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, Maryland 21702, United States
| | - Yves Pommier
- ‡Laboratory of Molecular Pharmacology and Developmental Therapeutic Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Building 37, Room 5068, Bethesda, Maryland 20892-4255, United States
| | - Christophe Marchand
- ‡Laboratory of Molecular Pharmacology and Developmental Therapeutic Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Building 37, Room 5068, Bethesda, Maryland 20892-4255, United States
| | - Roberta Costi
- †Dipartimento di Chimica e Tecnologie del Farmaco, Istituto Pasteur-Fondazione Cenci Bolognetti, "Sapienza" Università di Roma, P-le Aldo Moro 5, I-00185, Roma, Italy
| | - 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, Roma, Italy
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Dalhus B, Alseth I, Bjørås M. Structural basis for incision at deaminated adenines in DNA and RNA by endonuclease V. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2015; 117:134-142. [PMID: 25824682 DOI: 10.1016/j.pbiomolbio.2015.03.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2014] [Revised: 03/19/2015] [Accepted: 03/20/2015] [Indexed: 01/15/2023]
Abstract
Deamination of the exocyclic amines in adenine, guanine and cytosine forms base lesions that may lead to mutations if not removed by DNA repair proteins. Prokaryotic endonuclease V (EndoV/Nfi) has long been known to incise DNA 3' to a variety of base lesions, including deaminated adenine, guanine and cytosine. Biochemical and genetic data implicate that EndoV is involved in repair of these deaminated bases. In contrast to DNA glycosylases that remove a series of modified/damaged bases in DNA by direct excision of the nucleobase, EndoV cleaves the DNA sugar phosphate backbone at the second phosphodiester 3' to the lesion without removing the deaminated base. Structural investigation of this unusual incision by EndoV has unravelled an enzyme with separate base lesion and active site pockets. A novel wedge motif was identified as a DNA strand-separation feature important for damage detection. Human EndoV appears inactive on DNA, but has been shown to incise various RNA substrates containing inosine. Inosine is the deamination product of adenosine and is frequently found in RNA. The structural basis for discrimination between DNA and RNA by human EndoV remains elusive.
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Affiliation(s)
- Bjørn Dalhus
- Department of Medical Biochemistry, Institute for Clinical Medicine, University of Oslo, PO Box 4950, Nydalen, N-0424 Oslo, Norway; Department of Microbiology, Clinic for Diagnostics and Intervention, Oslo University Hospital, Rikshospitalet, PO Box 4950, Nydalen, N-0424 Oslo, Norway.
| | - Ingrun Alseth
- Department of Microbiology, Clinic for Diagnostics and Intervention, Oslo University Hospital, Rikshospitalet, PO Box 4950, Nydalen, N-0424 Oslo, Norway
| | - Magnar Bjørås
- Department of Microbiology, Clinic for Diagnostics and Intervention, Oslo University Hospital, Rikshospitalet, PO Box 4950, Nydalen, N-0424 Oslo, Norway
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Enzymatic Activities of RNase H Domains of HIV-1 Reverse Transcriptase with Substrate Binding Domains of Bacterial RNases H1 and H2. Mol Biotechnol 2015; 57:526-38. [DOI: 10.1007/s12033-015-9846-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Sirous H, Zabihollahi R, Aghasadeghi MR, Sadat SM, Saghaie L, Fassihi A. Docking studies of some 5-hydroxypyridine-4-one derivatives: evaluation of integrase and ribonuclease H domain of reverse transcriptase as possible targets for anti-HIV-1 activity. Med Chem Res 2014. [DOI: 10.1007/s00044-014-1289-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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50
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Divalent metal ion-induced folding mechanism of RNase H1 from extreme halophilic archaeon Halobacterium sp. NRC-1. PLoS One 2014; 9:e109016. [PMID: 25268753 PMCID: PMC4182655 DOI: 10.1371/journal.pone.0109016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2014] [Accepted: 08/28/2014] [Indexed: 01/23/2023] Open
Abstract
RNase H1 from Halobacterium sp. NRC-1 (Halo-RNase H1) is characterized by the abundance of acidic residues on the surface, including bi/quad-aspartate site residues. Halo-RNase H1 exists in partially folded (I) and native (N) states in low-salt and high-salt conditions respectively. Its folding is also induced by divalent metal ions. To understand this unique folding mechanism of Halo-RNase H1, the active site mutant (2A-RNase H1), the bi/quad-aspartate site mutant (6A-RNase H1), and the mutant at both sites (8A-RNase H1) were constructed. The far-UV CD spectra of these mutants suggest that 2A-RNase H1 mainly exists in the I state, 6A-RNase H1 exists both in the I and N states, and 8A-RNase H1 mainly exists in the N state in a low salt-condition. These results suggest that folding of Halo-RNase H1 is induced by binding of divalent metal ions to the bi/quad-aspartate site. To examine whether metal-induced folding is unique to Halo-RNase H1, RNase H2 from the same organism (Halo-RNase H2) was overproduced and purified. Halo-RNase H2 exists in the I and N states in low-salt and high-salt conditions respectively, as does Halo-RNase H1. However, this protein exists in the I state even in the presence of divalent metal ions. Halo-RNase H2 exhibits junction ribonuclease activity only in a high-salt condition. A tertiary model of this protein suggests that this protein does not have a quad-aspartate site. We propose that folding of Halo-RNase H1 is induced by binding of divalent metal ion to the quad-aspartate site in a low-salt condition.
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