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Nosova NV, Sokolov AA, Gein ON, Gein VL, Yankin AN, Danilov SE, Dmitriev MV. Synthesis and Analgesic Activity of N,6-Diaryl-4-hydroxy-4-methyl-2-oxocyclohexane-1-carboxamides and Their Dehydration Products. RUSS J GEN CHEM+ 2020. [DOI: 10.1134/s1070363220090017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Stereoselective synthesis of novel functionalized cyclohexanone derivatives via the condensation of aromatic aldehydes with acetoacetamide and the influence of the ortho-effect and autocondensation. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.05.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Kiebist J, Schmidtke K, Zimmermann J, Kellner H, Jehmlich N, Ullrich R, Zänder D, Hofrichter M, Scheibner K. A Peroxygenase from Chaetomium globosum Catalyzes the Selective Oxygenation of Testosterone. Chembiochem 2017; 18:563-569. [PMID: 28103392 PMCID: PMC5363369 DOI: 10.1002/cbic.201600677] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Indexed: 01/18/2023]
Abstract
Unspecific peroxygenases (UPO, EC 1.11.2.1) secreted by fungi open an efficient way to selectively oxyfunctionalize diverse organic substrates, including less-activated hydrocarbons, by transferring peroxide-borne oxygen. We investigated a cell-free approach to incorporate epoxy and hydroxyl functionalities directly into the bulky molecule testosterone by a novel unspecific peroxygenase (UPO) that is produced by the ascomycetous fungus Chaetomium globosum in a complex medium rich in carbon and nitrogen. Purification by fast protein liquid chromatography revealed two enzyme fractions with the same molecular mass (36 kDa) and with specific activity of 4.4 to 12 U mg-1 . Although the well-known UPOs of Agrocybe aegerita (AaeUPO) and Marasmius rotula (MroUPO) failed to convert testosterone in a comparative study, the UPO of C. globosum (CglUPO) accepted testosterone as substrate and converted it with total turnover number (TTN) of up to 7000 into two oxygenated products: the 4,5-epoxide of testosterone in β-configuration and 16α-hydroxytestosterone. The reaction performed on a 100 mg scale resulted in the formation of about 90 % of the epoxide and 10 % of the hydroxylation product, both of which could be isolated with purities above 96 %. Thus, CglUPO is a promising biocatalyst for the oxyfunctionalization of bulky steroids and it will be a useful tool for the synthesis of pharmaceutically relevant steroidal molecules.
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Affiliation(s)
- Jan Kiebist
- Faculty of Environment and Natural SciencesBrandenburg University of Technology Cottbus-SenftenbergUniversitätsplatz 101968SenftenbergGermany
| | - Kai‐Uwe Schmidtke
- Faculty of Environment and Natural SciencesBrandenburg University of Technology Cottbus-SenftenbergUniversitätsplatz 101968SenftenbergGermany
| | - Jörg Zimmermann
- Faculty of Environment and Natural SciencesBrandenburg University of Technology Cottbus-SenftenbergUniversitätsplatz 101968SenftenbergGermany
| | - Harald Kellner
- Department of Bio- and Environmental SciencesTU DresdenInternational Institute ZittauMarkt 2302763ZittauGermany
| | - Nico Jehmlich
- Department of Molecular Systems BiologyHelmholtz-Centre for Environmental ResearchUFZPermoserstrasse 1504318LeipzigGermany
| | - René Ullrich
- Department of Bio- and Environmental SciencesTU DresdenInternational Institute ZittauMarkt 2302763ZittauGermany
| | | | - Martin Hofrichter
- Department of Bio- and Environmental SciencesTU DresdenInternational Institute ZittauMarkt 2302763ZittauGermany
| | - Katrin Scheibner
- Faculty of Environment and Natural SciencesBrandenburg University of Technology Cottbus-SenftenbergUniversitätsplatz 101968SenftenbergGermany
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4
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Role of Tat protein in HIV neuropathogenesis. Neurotox Res 2009; 16:205-20. [PMID: 19526283 DOI: 10.1007/s12640-009-9047-8] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2009] [Revised: 03/09/2009] [Accepted: 03/09/2009] [Indexed: 12/13/2022]
Abstract
The Tat protein of the human immunodeficiency virus (HIV) has been implicated in the pathophysiology of the neurocognitive deficits associated with HIV infection. This is the earliest protein to be produced by the proviral DNA in the infected cell. The protein not only drives the regulatory regions of the virus but may also be actively released from the cell and then interact with the cell surface receptors of other uninfected cells in the brain leading to cellular dysfunction. It may also be taken up by these cells and can then activate a number of host genes. The Tat protein is highly potent and has the unique ability to travel along neuronal pathways. Importantly, its production is not impacted by the use of antiretroviral drugs once the proviral DNA has been formed. This article reviews the pleomorphic actions of Tat protein and the evidence supporting its central role in the neuropathogenesis of the HIV infection.
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Carvalho JFS, Cruz Silva MM, Moreira JN, Simões S, Sá e Melo ML. Efficient Chemoenzymatic Synthesis, Cytotoxic Evaluation, and SAR of Epoxysterols. J Med Chem 2009; 52:4007-19. [DOI: 10.1021/jm9003973] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- João F. S. Carvalho
- Centro de Estudos Farmacêuticos, Laboratório Quíımica Farmacêutica, Faculdade de Farmácia, Universidade de Coimbra, 3000-548 Coimbra, Portugal, Laboratório de Tecnologia Farmacêutica, Faculdade de Farmácia, Universidade de Coimbra, 3000-548 Coimbra, Portugal, Center for Neurosciense and Cell Biology, University of Coimbra, Portugal
| | - M. Manuel Cruz Silva
- Centro de Estudos Farmacêuticos, Laboratório Quíımica Farmacêutica, Faculdade de Farmácia, Universidade de Coimbra, 3000-548 Coimbra, Portugal, Laboratório de Tecnologia Farmacêutica, Faculdade de Farmácia, Universidade de Coimbra, 3000-548 Coimbra, Portugal, Center for Neurosciense and Cell Biology, University of Coimbra, Portugal
| | - João N. Moreira
- Centro de Estudos Farmacêuticos, Laboratório Quíımica Farmacêutica, Faculdade de Farmácia, Universidade de Coimbra, 3000-548 Coimbra, Portugal, Laboratório de Tecnologia Farmacêutica, Faculdade de Farmácia, Universidade de Coimbra, 3000-548 Coimbra, Portugal, Center for Neurosciense and Cell Biology, University of Coimbra, Portugal
| | - Sérgio Simões
- Centro de Estudos Farmacêuticos, Laboratório Quíımica Farmacêutica, Faculdade de Farmácia, Universidade de Coimbra, 3000-548 Coimbra, Portugal, Laboratório de Tecnologia Farmacêutica, Faculdade de Farmácia, Universidade de Coimbra, 3000-548 Coimbra, Portugal, Center for Neurosciense and Cell Biology, University of Coimbra, Portugal
| | - M. Luisa Sá e Melo
- Centro de Estudos Farmacêuticos, Laboratório Quíımica Farmacêutica, Faculdade de Farmácia, Universidade de Coimbra, 3000-548 Coimbra, Portugal, Laboratório de Tecnologia Farmacêutica, Faculdade de Farmácia, Universidade de Coimbra, 3000-548 Coimbra, Portugal, Center for Neurosciense and Cell Biology, University of Coimbra, Portugal
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Thomas JL, Mack VL, Glow JA, Moshkelani D, Terrell JR, Bucholtz KM. Structure/function of the inhibition of human 3beta-hydroxysteroid dehydrogenase type 1 and type 2 by trilostane. J Steroid Biochem Mol Biol 2008; 111:66-73. [PMID: 18524572 PMCID: PMC2580795 DOI: 10.1016/j.jsbmb.2008.04.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2007] [Revised: 04/07/2008] [Accepted: 04/18/2008] [Indexed: 10/22/2022]
Abstract
The human type 1 (placenta, breast tumors) and type 2 (gonads, adrenals) isoforms of 3beta-hydroxysteroid dehydrogenase/isomerase (3beta-HSD) are key enzymes in biosynthesis of all active steroid hormones. Human 3beta-HSD1 is a critical enzyme in the conversion of DHEA to estradiol in breast tumors and may be a major target enzyme for the treatment of breast cancer. 3beta-HSD2 participates in the production of cortisol and aldosterone in the human adrenal gland. The goals of this project are to evaluate the role of the 2alpha-cyano group on trilostane (2alpha-cyano-4alpha,5alpha-epoxy-17beta-ol-androstane-3-one) and determine which amino acids may be critical for 3beta-HSD1 specificity. Trilostane without the 2alpha-cyano group, 4alpha,5alpha-epoxy-testosterone, was synthesized. Using our structural model of 3beta-HSD1, trilostane or 4alpha,5alpha-epoxy-testosterone was docked in the active site using Autodock 3.0, and the potentially critical residues (Met187 and Ser124) were identified. The M187T and S124T mutants of 3beta-HSD1 were created, expressed and purified. Dixon analyses of the inhibition of wild-type 3beta-HSD1, 3beta-HSD2, M187T and S124T by trilostane and 4alpha,5alpha-epoxy-testosterone suggest that the 2alpha-cyano group of trilostane is anchored by Ser124 in both isoenzymes. Kinetic analyses of cofactor and substrate utilization as well as the inhibition kinetics of M187T and the wild-type enzymes suggest that the 16-fold higher-affinity inhibition of 3beta-HSD1 by trilostane may be related to the presence of Met187 in 3beta-HSD1 and Thr187 in 3beta-HSD2. This structure/function information may lead to the production of more highly specific inhibitors of 3beta-HSD1 to block the hormone-dependent growth of breast tumors.
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Affiliation(s)
- James L Thomas
- Division of Basic Medical Sciences, Mercer University School of Medicine, 1550 College Street, Macon, GA 31207, USA.
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Kurz K, Göbel MW. Hydrolytical Cleavage of TAR-RNA, thetrans-Activation Responsive Region of HIV-1, by a Bis(guanidinium) Catalyst Attached to Arginine. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19960790719] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Gatignol A, Jeang KT. Tat as a transcriptional activator and a potential therapeutic target for HIV-1. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2001; 48:209-27. [PMID: 10987092 DOI: 10.1016/s1054-3589(00)48007-5] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- A Gatignol
- U529 INSERM, Institut Cochin de Génétique Moléculaire, Paris, France
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Friedler A, Friedler D, Luedtke NW, Tor Y, Loyter A, Gilon C. Development of a functional backbone cyclic mimetic of the HIV-1 Tat arginine-rich motif. J Biol Chem 2000; 275:23783-9. [PMID: 10764789 DOI: 10.1074/jbc.m002200200] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We have used the backbone cyclic proteinomimetics approach to develop peptides that functionally mimic the arginine-rich motif (ARM) of the HIV-1 Tat protein. This consensus sequence serves both as a nuclear localization signal (NLS) and as an RNA binding domain. Based on the NMR structure of Tat, we have designed and synthesized a backbone cyclic ARM mimetic peptide library. The peptides were screened for their ability to mediate nuclear import of the corresponding BSA conjugates in permeabilized cells. One peptide, designated "Tat11," displayed active NLS properties. Nuclear import of Tat11-BSA was found to proceed by the same distinct pathway used by the Tat-NLS and not by the common importin alpha pathway, which is used by the SV40-NLS. Most of the Tat-derived backbone cyclic peptides display selective inhibitory activity as demonstrated by the inhibition of the nuclear import mediated by the Tat-NLS and not by the SV40-NLS. The Tat-ARM-derived peptides, including Tat-11, also inhibited binding of the HIV-1 Rev-ARM to its corresponding RNA element (Rev response element) with inhibition constants of 5 nm. Here we have shown for the first time (a) a functional mimetic of a protein sequence, which activates a nuclear import receptor and (b) a mimetic of a protein sequence with a dual functionality. Tat11 is a lead compound which can potentially inhibit the HIV-1 life cycle by a dual mechanism: inhibition of nuclear import and of RNA binding.
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Affiliation(s)
- A Friedler
- Department of Organic Chemistry, Institute of Chemistry, and the Department of Biological Chemistry, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel
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11
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Mestre B, Arzumanov A, Singh M, Boulmé F, Litvak S, Gait MJ. Oligonucleotide inhibition of the interaction of HIV-1 Tat protein with the trans-activation responsive region (TAR) of HIV RNA. BIOCHIMICA ET BIOPHYSICA ACTA 1999; 1445:86-98. [PMID: 10209261 DOI: 10.1016/s0167-4781(99)00019-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The interaction of HIV-1 Tat protein with its recognition sequence, the trans-activation responsive region TAR is a potential target for drug discovery against HIV infection. We show by use of an in vitro competition filter binding interference assay that synthetic oligodeoxyribonucleotides complementary to the HIV-1 TAR RNA apical stem-loop and bulge region inhibit the binding of Tat protein or a Tat peptide (residues 37-72) better than two small molecules that have been shown to bind TAR RNA, Hoechst 33258 and neomycin B. The inhibition is not sensitive to length between 13 and 16 residues or precise positioning but shorter oligonucleotides are less effective. Enhanced inhibition was obtained for a 16-mer 2'-O-methyl oligoribonucleotide but not for C5-propyne pyrimidine-substituted oligonucleotides. Control non-antisense oligonucleotides were occasionally also effective in filter binding interference but only the complementary antisense 2'-O-methyl oligoribonucleotide was effective in gel mobility shift assays in direct TAR binding or in interference with Tat peptide binding to the TAR stem-loop. This is the first demonstration of effective inhibition of the Tat-TAR interaction by nuclease-stabilized oligonucleotide analogues.
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Affiliation(s)
- B Mestre
- Medical Research Council, Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, UK
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12
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Daelemans D, Vandamme AM, De Clercq E. Human immunodeficiency virus gene regulation as a target for antiviral chemotherapy. Antivir Chem Chemother 1999; 10:1-14. [PMID: 10079874 DOI: 10.1177/095632029901000101] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Inhibitors interfering with human immunodeficiency virus (HIV) gene regulation may have great potential in anti-HIV drug (combination) therapy. They act against different targets to currently used anti-HIV drugs, reduce virus production from acute and chronically infected cells and are anticipated to elicit less virus drug resistance. Several agents have already proven to inhibit HIV gene regulation in vitro. A first class of compounds interacts with cellular factors that bind to the long terminal repeat (LTR) promoter and that are needed for basal level transcription, such as NF-kappa B and Sp1 inhibitors. A second class of compounds specifically inhibits the transactivation of the HIV LTR promoter by the viral Tat protein, such as the peptoid CGP64222. A third class of compounds prevents the accumulation of single and unspliced mRNAs through inhibition of the viral regulator protein Rev, such as the aminoglycosidic antibiotics. Most of these compounds have been tested in specific transactivation assays. Whether they are active at the postulated target in virus replication assays has, for many of them, not been ascertained. Toxicity data are often lacking or insufficient. Yet these data are crucial in view of the toxicity that may be expected for compounds that primarily interact with cellular factors. Although a promising lead, considerable research is still required before gene regulation inhibitors may come of age as clinically useful agents.
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Affiliation(s)
- D Daelemans
- Rega Institute for Medical Research, Katholieke Universiteit Leuven, Belgium.
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Mancebo HS, Lee G, Flygare J, Tomassini J, Luu P, Zhu Y, Peng J, Blau C, Hazuda D, Price D, Flores O. P-TEFb kinase is required for HIV Tat transcriptional activation in vivo and in vitro. Genes Dev 1997; 11:2633-44. [PMID: 9334326 PMCID: PMC316604 DOI: 10.1101/gad.11.20.2633] [Citation(s) in RCA: 448] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/1997] [Accepted: 08/22/1997] [Indexed: 02/05/2023]
Abstract
To identify novel inhibitors of transcriptional activation by the HIV Tat protein, we used a combination of in vitro and in vivo Tat-dependent transcription assays to screen >100,000 compounds. All compounds identified blocked Tat-dependent stimulation of transcriptional elongation. Analysis of a panel of structurally diverse inhibitors indicated that their target is the human homolog of Drosophila positive transcription elongation factor b (P-TEFb). Loss of Tat transactivation in extracts depleted of the kinase subunit of human P-TEFb, PITALRE, was reversed by addition of partially purified human P-TEFb. Transfection experiments with wild-type or kinase knockout PITALRE demonstrated that P-TEFb is required for Tat function. Our results suggest that P-TEFb represents an attractive target for the development of novel HIV therapeutics.
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Affiliation(s)
- H S Mancebo
- Tularik, Inc., South San Francisco, California 94080 USA
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14
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Affiliation(s)
- J R Hanson
- School of Molecular Sciences, University of Sussex, Brighton, UK
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Hamy F, Felder ER, Heizmann G, Lazdins J, Aboul-ela F, Varani G, Karn J, Klimkait T. An inhibitor of the Tat/TAR RNA interaction that effectively suppresses HIV-1 replication. Proc Natl Acad Sci U S A 1997; 94:3548-53. [PMID: 9108013 PMCID: PMC20476 DOI: 10.1073/pnas.94.8.3548] [Citation(s) in RCA: 204] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
One of the first steps in HIV gene expression is the recruitment of Tat protein to the transcription machinery after its binding to the RNA response element TAR. Starting from a pool of 3.2 x 10(6) individual chemical entities, we were able to select a hybrid peptoid/peptide oligomer of 9 residues (CGP64222) that was able to block the formation of the Tat/TAR RNA complex in vitro at nanomolar concentrations. NMR studies demonstrated that the compound binds similarly to polypeptides derived from the Tat protein and induces a conformational change in TAR RNA at the Tat-binding site. In addition, 10-30 microM CGP64222 specifically inhibited Tat activity in a cellular Tat-dependent transactivation assay [fusion-induced gene stimulation (FIGS) assay] and blocked HIV-1 replication in primary human lymphocytes. By contrast, peptides of a comparable size and side-chain composition inhibited cell fusion in the FIGS assay and only partially inhibited HIV-1 replication in primary human lymphocytes. Thus, we have discovered a compound, CGP64222, that specifically inhibits the Tat/TAR RNA interaction, both in vitro and in vivo.
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Affiliation(s)
- F Hamy
- Novartis, Ltd., Pharmaceuticals, Pharma Research, Basle, Switzerland
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Enantioselective synthesis of (2S4aS,8aR)-1,1,4a-trimethyldecahydronaphthalen-2-ol [(−)-TMD], (4aS,8aR)-5,5,8a-trimethyloctahydronaphthalen-2(1H)-one, and (−)-polywood®, through michael-type reaction of chiral imines. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s0957-4166(97)00082-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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