1
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Bubenik M, Mader P, Mochirian P, Vallée F, Clark J, Truchon JF, Perryman AL, Pau V, Kurinov I, Zahn KE, Leclaire ME, Papp R, Mathieu MC, Hamel M, Duffy NM, Godbout C, Casas-Selves M, Falgueyret JP, Baruah PS, Nicolas O, Stocco R, Poirier H, Martino G, Fortin AB, Roulston A, Chefson A, Dorich S, St-Onge M, Patel P, Pellerin C, Ciblat S, Pinter T, Barabé F, Bakkouri ME, Parikh P, Gervais C, Sfeir A, Mamane Y, Morris SJ, Black WC, Sicheri F, Gallant M. Identification of RP-6685, an Orally Bioavailable Compound that Inhibits the DNA Polymerase Activity of Polθ. J Med Chem 2022; 65:13198-13215. [PMID: 36126059 PMCID: PMC9942948 DOI: 10.1021/acs.jmedchem.2c00998] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
DNA polymerase theta (Polθ) is an attractive synthetic lethal target for drug discovery, predicted to be efficacious against breast and ovarian cancers harboring BRCA-mutant alleles. Here, we describe our hit-to-lead efforts in search of a selective inhibitor of human Polθ (encoded by POLQ). A high-throughput screening campaign of 350,000 compounds identified an 11 micromolar hit, giving rise to the N2-substituted fused pyrazolo series, which was validated by biophysical methods. Structure-based drug design efforts along with optimization of cellular potency and ADME ultimately led to the identification of RP-6685: a potent, selective, and orally bioavailable Polθ inhibitor that showed in vivo efficacy in an HCT116 BRCA2-/- mouse tumor xenograft model.
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Affiliation(s)
- Monica Bubenik
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Pavel Mader
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, M5G 1X5, Canada
| | - Philippe Mochirian
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Fréderic Vallée
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Jillian Clark
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Jean-François Truchon
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Alexander L. Perryman
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Victor Pau
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, M5G 1X5, Canada
| | - Igor Kurinov
- Department of Chemistry and Chemical Biology, Cornell University, NE-CAT, Argonne, Illinois 60439, USA
| | - Karl E. Zahn
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Marie-Eve Leclaire
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Robert Papp
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Marie-Claude Mathieu
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Martine Hamel
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Nicole M. Duffy
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Claude Godbout
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Matias Casas-Selves
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Jean-Pierre Falgueyret
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Prasamit S. Baruah
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Olivier Nicolas
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Rino Stocco
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Hugo Poirier
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Giovanni Martino
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | | | - Anne Roulston
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Amandine Chefson
- Ventus Therapeutics 7150 Frederick-Banting suite 200, Montréal, Québec, H4S 2A1, Canada
| | - Stéphane Dorich
- Ventus Therapeutics 7150 Frederick-Banting suite 200, Montréal, Québec, H4S 2A1, Canada
| | - Miguel St-Onge
- Ventus Therapeutics 7150 Frederick-Banting suite 200, Montréal, Québec, H4S 2A1, Canada
| | - Purvish Patel
- Ventus Therapeutics 7150 Frederick-Banting suite 200, Montréal, Québec, H4S 2A1, Canada
| | - Charles Pellerin
- Ventus Therapeutics 7150 Frederick-Banting suite 200, Montréal, Québec, H4S 2A1, Canada
| | - Stéphane Ciblat
- Ventus Therapeutics 7150 Frederick-Banting suite 200, Montréal, Québec, H4S 2A1, Canada
- Paraza Pharma Inc., 2525 Ave. Marie Curie, Montréal, Québec, H4S 1Z9, Canada
| | - Thomas Pinter
- Paraza Pharma Inc., 2525 Ave. Marie Curie, Montréal, Québec, H4S 1Z9, Canada
| | - Francis Barabé
- Paraza Pharma Inc., 2525 Ave. Marie Curie, Montréal, Québec, H4S 1Z9, Canada
| | - Majida El Bakkouri
- Paraza Pharma Inc., 2525 Ave. Marie Curie, Montréal, Québec, H4S 1Z9, Canada
- National Research Council of Canada, 6100 Royalmount Ave, Montréal, Québec, H4P 2R2, Canada
| | - Paranjay Parikh
- Piramal Pharma Ltd., Plot No. 18, Village Matoda, Taluka: Sanand, Ahmedabad-382213, Gujarat, India
| | - Christian Gervais
- National Research Council of Canada, 6100 Royalmount Ave, Montréal, Québec, H4P 2R2, Canada
| | - Agnel Sfeir
- Molecular Biology Program, Sloan Kettering Institute, MSKCC, 430 E 67th Street, New York, NY 10065, USA
| | - Yael Mamane
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Stephen J. Morris
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - W. Cameron Black
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
| | - Frank Sicheri
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, M5G 1X5, Canada
| | - Michel Gallant
- Repare Therapeutics, 7171 Frederick-Banting, Building 2, H4S 1Z9, Montréal, Québec, Canada
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2
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Chana CK, Maisonneuve P, Posternak G, Grinberg NGA, Poirson J, Ona SM, Ceccarelli DF, Mader P, St-Cyr DJ, Pau V, Kurinov I, Tang X, Deng D, Cui W, Su W, Kuai L, Soll R, Tyers M, Röst HL, Batey RA, Taipale M, Gingras AC, Sicheri F. Discovery and Structural Characterization of Small Molecule Binders of the Human CTLH E3 Ligase Subunit GID4. J Med Chem 2022; 65:12725-12746. [PMID: 36117290 PMCID: PMC9574856 DOI: 10.1021/acs.jmedchem.2c00509] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Targeted protein
degradation (TPD) strategies exploit bivalent
small molecules to bridge substrate proteins to an E3 ubiquitin ligase
to induce substrate degradation. Few E3s have been explored as degradation
effectors due to a dearth of E3-binding small molecules. We show that
genetically induced recruitment to the GID4 subunit of the CTLH E3
complex induces protein degradation. An NMR-based fragment screen
followed by structure-guided analog elaboration identified two binders
of GID4, 16 and 67, with Kd values of 110 and 17 μM in vitro. A parallel DNA-encoded library (DEL) screen identified five binders
of GID4, the best of which, 88, had a Kd of 5.6 μM in vitro and an EC50 of 558 nM in cells with strong selectivity for GID4. X-ray
co-structure determination revealed the basis for GID4–small
molecule interactions. These results position GID4-CTLH as an E3 for
TPD and provide candidate scaffolds for high-affinity moieties that
bind GID4.
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Affiliation(s)
- Chetan K Chana
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, Ontario M5G 1X5, Canada.,Department of Biochemistry, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Pierre Maisonneuve
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, Ontario M5G 1X5, Canada
| | - Ganna Posternak
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, Ontario M5G 1X5, Canada
| | - Nicolas G A Grinberg
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, Ontario M5G 1X5, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Juline Poirson
- Donnelly Centre for Cellular and Biomolecular Research, Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 3E1, Canada
| | - Samara M Ona
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, Ontario M5G 1X5, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Derek F Ceccarelli
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, Ontario M5G 1X5, Canada
| | - Pavel Mader
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, Ontario M5G 1X5, Canada
| | | | - Victor Pau
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, Ontario M5G 1X5, Canada
| | - Igor Kurinov
- Department of Chemistry and Chemical Biology, Cornell University, NE-CAT, Argonne, Illinois 60439, United States
| | - Xiaojing Tang
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, Ontario M5G 1X5, Canada
| | - Dongjing Deng
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Weiren Cui
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Wenji Su
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Letian Kuai
- WuXi AppTec, 55 Cambridge Parkway, 8th Floor, Cambridge, Massachusetts 02142, United States
| | - Richard Soll
- WuXi AppTec, 55 Cambridge Parkway, 8th Floor, Cambridge, Massachusetts 02142, United States
| | - Mike Tyers
- Institute for Research in Immunology and Cancer, University of Montréal, Québec H3C 3J7, Canada
| | - Hannes L Röst
- Donnelly Centre for Cellular and Biomolecular Research, Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 3E1, Canada.,Department of Computer Science, University of Toronto, Toronto, Ontario M5S 2E4, Canada
| | - Robert A Batey
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Mikko Taipale
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada.,Donnelly Centre for Cellular and Biomolecular Research, Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 3E1, Canada
| | - Anne-Claude Gingras
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, Ontario M5G 1X5, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Frank Sicheri
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, Ontario M5G 1X5, Canada.,Department of Biochemistry, University of Toronto, Toronto, Ontario M5S 1A8, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada
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3
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Szychowski J, Papp R, Dietrich E, Liu B, Vallée F, Leclaire MÈ, Fourtounis J, Martino G, Perryman AL, Pau V, Yun Yin S, Mader P, Roulston A, Truchon JF, Marshall CG, Diallo M, Duffy NM, Stocco R, Godbout C, Bonneau-Fortin A, Kryczka R, Bhaskaran V, Mao D, Orlicky S, Beaulieu P, Turcotte P, Kurinov I, Sicheri F, Mamane Y, Gallant M, Black WC. Discovery of an Orally Bioavailable and Selective PKMYT1 Inhibitor, RP-6306. J Med Chem 2022; 65:10251-10284. [PMID: 35880755 PMCID: PMC9837800 DOI: 10.1021/acs.jmedchem.2c00552] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
PKMYT1 is a regulator of CDK1 phosphorylation and is a compelling therapeutic target for the treatment of certain types of DNA damage response cancers due to its established synthetic lethal relationship with CCNE1 amplification. To date, no selective inhibitors have been reported for this kinase that would allow for investigation of the pharmacological role of PKMYT1. To address this need compound 1 was identified as a weak PKMYT1 inhibitor. Introduction of a dimethylphenol increased potency on PKMYT1. These dimethylphenol analogs were found to exist as atropisomers that could be separated and profiled as single enantiomers. Structure-based drug design enabled optimization of cell-based potency. Parallel optimization of ADME properties led to the identification of potent and selective inhibitors of PKMYT1. RP-6306 inhibits CCNE1-amplified tumor cell growth in several preclinical xenograft models. The first-in-class clinical candidate RP-6306 is currently being evaluated in Phase 1 clinical trials for treatment of various solid tumors.
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Affiliation(s)
- Janek Szychowski
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Robert Papp
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Evelyne Dietrich
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Bingcan Liu
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Frédéric Vallée
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Marie-Ève Leclaire
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Jimmy Fourtounis
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Giovanni Martino
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Alexander L. Perryman
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Victor Pau
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, ON, M5G 1X5, Canada
| | - Shou Yun Yin
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Pavel Mader
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, ON, M5G 1X5, Canada
| | - Anne Roulston
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Jean-Francois Truchon
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - C. Gary Marshall
- Repare Therapeutics, 1 Broadway, 15th Floor, Cambridge, MA 02142, USA
| | - Mohamed Diallo
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Nicole M. Duffy
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Rino Stocco
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Claude Godbout
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | | | - Rosie Kryczka
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Vivek Bhaskaran
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Daniel Mao
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, ON, M5G 1X5, Canada
| | - Stephen Orlicky
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, ON, M5G 1X5, Canada
| | - Patrick Beaulieu
- OmegaChem Inc., 480 Rue Perreault, Saint-Romuald, QC, G6W 7V6, Canada
| | - Pascal Turcotte
- AdMare BioInnovations, 7171 Frederick-Banting, Montréal, QC, H4S 1Z9, Canada
| | - Igor Kurinov
- Department of Chemistry and Chemical Biology, Cornell University, NE-CAT, Argonne, Il 60439, USA
| | - Frank Sicheri
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, ON, M5G 1X5, Canada
- Departments of Biochemistry and Molecular Genetics, University of Toronto, Ontario M5S 1A8, Canada
| | - Yael Mamane
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - Michel Gallant
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
| | - W. Cameron Black
- Repare Therapeutics, Inc., 7210 Frederick-Banting, Ville St-Laurent, QC, H4S 2A1, Canada
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4
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Tavernier N, Thomas Y, Vigneron S, Maisonneuve P, Orlicky S, Mader P, Regmi SG, Van Hove L, Levinson NM, Gasmi-Seabrook G, Joly N, Poteau M, Velez-Aguilera G, Gavet O, Castro A, Dasso M, Lorca T, Sicheri F, Pintard L. Bora phosphorylation substitutes in trans for T-loop phosphorylation in Aurora A to promote mitotic entry. Nat Commun 2021; 12:1899. [PMID: 33771996 PMCID: PMC7997955 DOI: 10.1038/s41467-021-21922-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 02/19/2021] [Indexed: 12/16/2022] Open
Abstract
Polo-like kinase 1 (Plk1) is instrumental for mitotic entry and progression. Plk1 is activated by phosphorylation on a conserved residue Thr210 in its activation segment by the Aurora A kinase (AURKA), a reaction that critically requires the co-factor Bora phosphorylated by a CyclinA/B-Cdk1 kinase. Here we show that phospho-Bora is a direct activator of AURKA kinase activity. We localize the key determinants of phospho-Bora function to a 100 amino acid region encompassing two short Tpx2-like motifs and a phosphoSerine-Proline motif at Serine 112, through which Bora binds AURKA. The latter substitutes in trans for the Thr288 phospho-regulatory site of AURKA, which is essential for an active conformation of the kinase domain. We demonstrate the importance of these determinants for Bora function in mitotic entry both in Xenopus egg extracts and in human cells. Our findings unveil the activation mechanism of AURKA that is critical for mitotic entry.
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Affiliation(s)
- N Tavernier
- Centre for Systems Biology, Lunenfeld Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada
- Programme équipe Labellisée Ligue Contre le Cancer, Institut Jacques Monod, UMR7592, Université de Paris, CNRS, Paris, France
| | - Y Thomas
- Programme équipe Labellisée Ligue Contre le Cancer, Institut Jacques Monod, UMR7592, Université de Paris, CNRS, Paris, France
| | - S Vigneron
- Centre de Recherche de Biologie cellulaire de Montpellier, UMR 5237, Université de Montpellier, CNRS, Montpellier, France
| | - P Maisonneuve
- Centre for Systems Biology, Lunenfeld Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada
| | - S Orlicky
- Centre for Systems Biology, Lunenfeld Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada
| | - P Mader
- Centre for Systems Biology, Lunenfeld Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada
| | - S G Regmi
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA
| | - L Van Hove
- Programme équipe Labellisée Ligue Contre le Cancer, Institut Jacques Monod, UMR7592, Université de Paris, CNRS, Paris, France
| | - N M Levinson
- Department of Pharmacology, University of Minnesota, Minneapolis, MN, USA
| | - G Gasmi-Seabrook
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - N Joly
- Programme équipe Labellisée Ligue Contre le Cancer, Institut Jacques Monod, UMR7592, Université de Paris, CNRS, Paris, France
| | - M Poteau
- Institut Gustave Roussy CNRS UMR9019, Villejuif, France
| | - G Velez-Aguilera
- Programme équipe Labellisée Ligue Contre le Cancer, Institut Jacques Monod, UMR7592, Université de Paris, CNRS, Paris, France
| | - O Gavet
- Institut Gustave Roussy CNRS UMR9019, Villejuif, France
| | - A Castro
- Centre de Recherche de Biologie cellulaire de Montpellier, UMR 5237, Université de Montpellier, CNRS, Montpellier, France
| | - M Dasso
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA
| | - T Lorca
- Centre de Recherche de Biologie cellulaire de Montpellier, UMR 5237, Université de Montpellier, CNRS, Montpellier, France
| | - F Sicheri
- Centre for Systems Biology, Lunenfeld Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada.
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada.
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada.
| | - L Pintard
- Programme équipe Labellisée Ligue Contre le Cancer, Institut Jacques Monod, UMR7592, Université de Paris, CNRS, Paris, France.
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5
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Posternak G, Tang X, Maisonneuve P, Jin T, Lavoie H, Daou S, Orlicky S, Goullet de Rugy T, Caldwell L, Chan K, Aman A, Prakesch M, Poda G, Mader P, Wong C, Maier S, Kitaygorodsky J, Larsen B, Colwill K, Yin Z, Ceccarelli DF, Batey RA, Taipale M, Kurinov I, Uehling D, Wrana J, Durocher D, Gingras AC, Al-Awar R, Therrien M, Sicheri F. Functional characterization of a PROTAC directed against BRAF mutant V600E. Nat Chem Biol 2020; 16:1170-1178. [PMID: 32778845 PMCID: PMC7862923 DOI: 10.1038/s41589-020-0609-7] [Citation(s) in RCA: 67] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 07/01/2020] [Indexed: 12/22/2022]
Abstract
The RAF family kinases function in the RAS-ERK pathway to transmit signals from activated RAS to the downstream kinases MEK and ERK. This pathway regulates cell proliferation, differentiation and survival, enabling mutations in RAS and RAF to act as potent drivers of human cancers. Drugs targeting the prevalent oncogenic mutant BRAF(V600E) have shown great efficacy in the clinic, but long-term effectiveness is limited by resistance mechanisms that often exploit the dimerization-dependent process by which RAF kinases are activated. Here, we investigated a proteolysis-targeting chimera (PROTAC) approach to BRAF inhibition. The most effective PROTAC, termed P4B, displayed superior specificity and inhibitory properties relative to non-PROTAC controls in BRAF(V600E) cell lines. In addition, P4B displayed utility in cell lines harboring alternative BRAF mutations that impart resistance to conventional BRAF inhibitors. This work provides a proof of concept for a substitute to conventional chemical inhibition to therapeutically constrain oncogenic BRAF.
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Affiliation(s)
- Ganna Posternak
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
- Drug Discovery Program, Ontario Institute for Cancer Research, Toronto, Ontario, Canada
- Department of Chemistry, University of Toronto, Toronto, Ontario, Canada
| | - Xiaojing Tang
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
| | - Pierre Maisonneuve
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
| | - Ting Jin
- Institute for Research in Immunology and Cancer, Laboratory of Intracellular Signaling, Université de Montréal, Quebec, Montreal, Canada
| | - Hugo Lavoie
- Institute for Research in Immunology and Cancer, Laboratory of Intracellular Signaling, Université de Montréal, Quebec, Montreal, Canada
| | - Salima Daou
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
| | - Stephen Orlicky
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
| | - Theo Goullet de Rugy
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
| | - Lauren Caldwell
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
| | - Kin Chan
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
| | - Ahmed Aman
- Drug Discovery Program, Ontario Institute for Cancer Research, Toronto, Ontario, Canada
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada
| | - Michael Prakesch
- Drug Discovery Program, Ontario Institute for Cancer Research, Toronto, Ontario, Canada
| | - Gennady Poda
- Drug Discovery Program, Ontario Institute for Cancer Research, Toronto, Ontario, Canada
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada
| | - Pavel Mader
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
| | - Cassandra Wong
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
| | - Stefan Maier
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
| | - Julia Kitaygorodsky
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
| | - Brett Larsen
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
| | - Karen Colwill
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
| | - Zhe Yin
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
- Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada
| | - Derek F Ceccarelli
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
| | - Robert A Batey
- Department of Chemistry, University of Toronto, Toronto, Ontario, Canada
| | - Mikko Taipale
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
- Donnelly Centre for Cellular and Biomolecular Research, Toronto, Ontario, Canada
| | - Igor Kurinov
- Department of Chemistry and Chemical Biology, Cornell University, NE-CAT, Argonne, IL, USA
| | - David Uehling
- Drug Discovery Program, Ontario Institute for Cancer Research, Toronto, Ontario, Canada
| | - Jeff Wrana
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
| | - Daniel Durocher
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
| | - Anne-Claude Gingras
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
| | - Rima Al-Awar
- Drug Discovery Program, Ontario Institute for Cancer Research, Toronto, Ontario, Canada
| | - Marc Therrien
- Institute for Research in Immunology and Cancer, Laboratory of Intracellular Signaling, Université de Montréal, Quebec, Montreal, Canada.
- Département de Pathologie et Biologie Cellulaire, University of Montréal, Quebec, Montreal, Canada.
| | - Frank Sicheri
- Center for Molecular, Cell and Systems Biology, Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada.
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada.
- Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada.
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6
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Mader P, Mendoza-Sanchez R, Iqbal A, Dong A, Dobrovetsky E, Corless VB, Liew SK, Houliston SR, De Freitas RF, Smil D, Sena CCD, Kennedy S, Diaz DB, Wu H, Dombrovski L, Allali-Hassani A, Min J, Schapira M, Vedadi M, Brown PJ, Santhakumar V, Yudin AK, Arrowsmith CH. Identification and characterization of the first fragment hits for SETDB1 Tudor domain. Bioorg Med Chem 2019; 27:3866-3878. [PMID: 31327677 DOI: 10.1016/j.bmc.2019.07.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 07/03/2019] [Accepted: 07/10/2019] [Indexed: 11/26/2022]
Abstract
SET domain bifurcated protein 1 (SETDB1) is a human histone-lysine methyltransferase which is amplified in human cancers and was shown to be crucial in the growth of non-small and small cell lung carcinoma. In addition to its catalytic domain, SETDB1 harbors a unique tandem tudor domain which recognizes histone sequences containing both methylated and acetylated lysines, and likely contributes to its localization on chromatin. Using X-ray crystallography and NMR spectroscopy fragment screening approaches, we have identified the first small molecule fragment hits that bind to histone peptide binding groove of the Tandem Tudor Domain (TTD) of SETDB1. Herein, we describe the binding modes of these fragments and analogues and the biophysical characterization of key compounds. These confirmed small molecule fragments will inform the development of potent antagonists of SETDB1 interaction with histones.
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Affiliation(s)
- Pavel Mader
- Structural Genomics Consortium, University of Toronto, Toronto, Canada
| | | | - Aman Iqbal
- Structural Genomics Consortium, University of Toronto, Toronto, Canada
| | - Aiping Dong
- Structural Genomics Consortium, University of Toronto, Toronto, Canada
| | - Elena Dobrovetsky
- Structural Genomics Consortium, University of Toronto, Toronto, Canada
| | | | - Sean K Liew
- Department of Chemistry, University of Toronto, Toronto, Canada
| | - Scott R Houliston
- Princess Margaret Cancer Centre and Department of Medical Biophysics, University of Toronto, Toronto, Canada
| | | | - David Smil
- Structural Genomics Consortium, University of Toronto, Toronto, Canada
| | - Carlo C Dela Sena
- Structural Genomics Consortium, University of Toronto, Toronto, Canada
| | - Steven Kennedy
- Structural Genomics Consortium, University of Toronto, Toronto, Canada
| | - Diego B Diaz
- Department of Chemistry, University of Toronto, Toronto, Canada
| | - Hong Wu
- Structural Genomics Consortium, University of Toronto, Toronto, Canada
| | | | | | - Jinrong Min
- Structural Genomics Consortium, University of Toronto, Toronto, Canada
| | - Matthieu Schapira
- Structural Genomics Consortium, University of Toronto, Toronto, Canada; Department of Pharmacology and Toxicology, University of Toronto, Toronto, Canada
| | - Masoud Vedadi
- Structural Genomics Consortium, University of Toronto, Toronto, Canada; Department of Pharmacology and Toxicology, University of Toronto, Toronto, Canada
| | - Peter J Brown
- Structural Genomics Consortium, University of Toronto, Toronto, Canada
| | | | - Andrei K Yudin
- Department of Chemistry, University of Toronto, Toronto, Canada.
| | - Cheryl H Arrowsmith
- Structural Genomics Consortium, University of Toronto, Toronto, Canada; Princess Margaret Cancer Centre and Department of Medical Biophysics, University of Toronto, Toronto, Canada.
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7
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Pachl P, Škerlová J, Šimčíková D, Kotik M, Křenková A, Mader P, Brynda J, Kapešová J, Křen V, Otwinowski Z, Řezáčová P. Crystal structure of native α-L-rhamnosidase from Aspergillus terreus. Acta Crystallogr D Struct Biol 2018; 74:1078-1084. [DOI: 10.1107/s2059798318013049] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 09/14/2018] [Indexed: 11/10/2022]
Abstract
α-L-Rhamnosidases cleave terminal nonreducing α-L-rhamnosyl residues from many natural rhamnoglycosides. This makes them catalysts of interest for various biotechnological applications. The X-ray structure of the GH78 family α-L-rhamnosidase from Aspergillus terreus has been determined at 1.38 Å resolution using the sulfur single-wavelength anomalous dispersion phasing method. The protein was isolated from its natural source in the native glycosylated form, and the active site contained a glucose molecule, probably from the growth medium. In addition to its catalytic domain, the α-L-rhamnosidase from A. terreus contains four accessory domains of unknown function. The structural data suggest that two of these accessory domains, E and F, might play a role in stabilizing the aglycon portion of the bound substrate.
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8
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Perfetti MT, Baughman BM, Dickson BM, Mu Y, Cui G, Mader P, Dong A, Norris JL, Rothbart SB, Strahl BD, Brown PJ, Janzen WP, Arrowsmith CH, Mer G, McBride KM, James LI, Frye SV. Identification of a fragment-like small molecule ligand for the methyl-lysine binding protein, 53BP1. ACS Chem Biol 2015; 10:1072-81. [PMID: 25590533 DOI: 10.1021/cb500956g] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Improving our understanding of the role of chromatin regulators in the initiation, development, and suppression of cancer and other devastating diseases is critical, as they are integral players in regulating DNA integrity and gene expression. Developing small molecule inhibitors for this target class with cellular activity is a crucial step toward elucidating their specific functions. We specifically targeted the DNA damage response protein, 53BP1, which uses its tandem tudor domain to recognize histone H4 dimethylated on lysine 20 (H4K20me2), a modification related to double-strand DNA breaks. Through a cross-screening approach, we identified UNC2170 (1) as a micromolar ligand of 53BP1, which demonstrates at least 17-fold selectivity for 53BP1 as compared to other methyl-lysine (Kme) binding proteins tested. Structural studies revealed that the tert-butyl amine of UNC2170 anchors the compound in the methyl-lysine (Kme) binding pocket of 53BP1, making it competitive with endogenous Kme substrates. X-ray crystallography also demonstrated that UNC2170 binds at the interface of two tudor domains of a 53BP1 dimer. Importantly, this compound functions as a 53BP1 antagonist in cellular lysates and shows cellular activity by suppressing class switch recombination, a process which requires a functional 53BP1 tudor domain. These results demonstrate that UNC2170 is a functionally active, fragment-like ligand for 53BP1.
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Affiliation(s)
- Michael T. Perfetti
- Center
for Integrative Chemical Biology and Drug Discovery, Division of Chemical
Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Brandi M. Baughman
- Center
for Integrative Chemical Biology and Drug Discovery, Division of Chemical
Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Bradley M. Dickson
- Center
for Integrative Chemical Biology and Drug Discovery, Division of Chemical
Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Yunxiang Mu
- Department
of Molecular Carcinogenesis, University of Texas MD Anderson Cancer Center, Smithville, Texas, United States
| | - Gaofeng Cui
- Department
of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, United States
| | - Pavel Mader
- Structural
Genomics Consortium, University of Toronto, Toronto, Ontario, Canada, M5G 1L7
| | - Aiping Dong
- Structural
Genomics Consortium, University of Toronto, Toronto, Ontario, Canada, M5G 1L7
| | - Jacqueline L. Norris
- Center
for Integrative Chemical Biology and Drug Discovery, Division of Chemical
Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Scott B. Rothbart
- Department
of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Brian D. Strahl
- Department
of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Peter J. Brown
- Structural
Genomics Consortium, University of Toronto, Toronto, Ontario, Canada, M5G 1L7
| | - William P. Janzen
- Center
for Integrative Chemical Biology and Drug Discovery, Division of Chemical
Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Cheryl H. Arrowsmith
- Structural
Genomics Consortium, University of Toronto, Toronto, Ontario, Canada, M5G 1L7
| | - Georges Mer
- Department
of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, United States
| | - Kevin M. McBride
- Department
of Molecular Carcinogenesis, University of Texas MD Anderson Cancer Center, Smithville, Texas, United States
| | - Lindsey I. James
- Center
for Integrative Chemical Biology and Drug Discovery, Division of Chemical
Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Stephen V. Frye
- Center
for Integrative Chemical Biology and Drug Discovery, Division of Chemical
Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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9
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Mader P, Pecina A, Cígler P, Lepšík M, Šícha V, Hobza P, Grüner B, Fanfrlík J, Brynda J, Řezáčová P. Carborane-based carbonic anhydrase inhibitors: insight into CAII/CAIX specificity from a high-resolution crystal structure, modeling, and quantum chemical calculations. Biomed Res Int 2014; 2014:389869. [PMID: 25309911 PMCID: PMC4189773 DOI: 10.1155/2014/389869] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Accepted: 06/08/2014] [Indexed: 12/03/2022]
Abstract
Carborane-based compounds are promising lead structures for development of inhibitors of carbonic anhydrases (CAs). Here, we report structural and computational analysis applicable to structure-based design of carborane compounds with selectivity toward the cancer-specific CAIX isoenzyme. We determined the crystal structure of CAII in complex with 1-methylenesulfamide-1,2-dicarba-closo-dodecaborane at 1.0 Å resolution and used this structure to model the 1-methylenesulfamide-1,2-dicarba-closo-dodecaborane interactions with CAIX. A virtual glycine scan revealed the contributions of individual residues to the energy of binding of 1-methylenesulfamide-1,2-dicarba-closo-dodecaborane to CAII and CAIX, respectively.
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Affiliation(s)
- Pavel Mader
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Vídeňská 1083, 140 00 Prague 4, Czech Republic
- Structural Genomics Consortium, University of Toronto, Toronto, ON, Canada M5G 1L7
| | - Adam Pecina
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences and IOCB Research Center, Flemingovo nam. 2, 166 10 Prague 6, Czech Republic
| | - Petr Cígler
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences and IOCB Research Center, Flemingovo nam. 2, 166 10 Prague 6, Czech Republic
| | - Martin Lepšík
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences and IOCB Research Center, Flemingovo nam. 2, 166 10 Prague 6, Czech Republic
| | - Václav Šícha
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Hlavní 1001, 250 68 Řež near Prague, Czech Republic
| | - Pavel Hobza
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences and IOCB Research Center, Flemingovo nam. 2, 166 10 Prague 6, Czech Republic
- Regional Center of Advanced Technologies and Materials, Department of Physical Chemistry, Palacký University, 77146 Olomouc, Czech Republic
| | - Bohumír Grüner
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Hlavní 1001, 250 68 Řež near Prague, Czech Republic
| | - Jindřich Fanfrlík
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences and IOCB Research Center, Flemingovo nam. 2, 166 10 Prague 6, Czech Republic
| | - Jiří Brynda
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Vídeňská 1083, 140 00 Prague 4, Czech Republic
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences and IOCB Research Center, Flemingovo nam. 2, 166 10 Prague 6, Czech Republic
| | - Pavlína Řezáčová
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Vídeňská 1083, 140 00 Prague 4, Czech Republic
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences and IOCB Research Center, Flemingovo nam. 2, 166 10 Prague 6, Czech Republic
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10
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Pecina A, Lepšík M, Řezáč J, Brynda J, Mader P, Řezáčová P, Hobza P, Fanfrlík J. QM/MM Calculations Reveal the Different Nature of the Interaction of Two Carborane-Based Sulfamide Inhibitors of Human Carbonic Anhydrase II. J Phys Chem B 2013; 117:16096-104. [DOI: 10.1021/jp410216m] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Adam Pecina
- Institute
of Organic Chemistry and Biochemistry (IOCB), Academy of Sciences of the Czech Republic, v.v.i.,
Gilead Sciences and IOCB Research Center, Flemingovo nám. 2, 166 10, Prague 6, Czech Republic
| | - Martin Lepšík
- Institute
of Organic Chemistry and Biochemistry (IOCB), Academy of Sciences of the Czech Republic, v.v.i.,
Gilead Sciences and IOCB Research Center, Flemingovo nám. 2, 166 10, Prague 6, Czech Republic
| | - Jan Řezáč
- Institute
of Organic Chemistry and Biochemistry (IOCB), Academy of Sciences of the Czech Republic, v.v.i.,
Gilead Sciences and IOCB Research Center, Flemingovo nám. 2, 166 10, Prague 6, Czech Republic
| | - Jiří Brynda
- Institute
of Organic Chemistry and Biochemistry (IOCB), Academy of Sciences of the Czech Republic, v.v.i.,
Gilead Sciences and IOCB Research Center, Flemingovo nám. 2, 166 10, Prague 6, Czech Republic
- Institute
of Molecular Genetics, Academy of Sciences of the Czech Republic, Videnska 1083, Prague 4, Czech Republic
| | - Pavel Mader
- Institute
of Molecular Genetics, Academy of Sciences of the Czech Republic, Videnska 1083, Prague 4, Czech Republic
| | - Pavlína Řezáčová
- Institute
of Organic Chemistry and Biochemistry (IOCB), Academy of Sciences of the Czech Republic, v.v.i.,
Gilead Sciences and IOCB Research Center, Flemingovo nám. 2, 166 10, Prague 6, Czech Republic
- Institute
of Molecular Genetics, Academy of Sciences of the Czech Republic, Videnska 1083, Prague 4, Czech Republic
| | - Pavel Hobza
- Institute
of Organic Chemistry and Biochemistry (IOCB), Academy of Sciences of the Czech Republic, v.v.i.,
Gilead Sciences and IOCB Research Center, Flemingovo nám. 2, 166 10, Prague 6, Czech Republic
- Regional
Center of Advanced Technologies and Materials, Department of Physical
Chemistry, Palacký University, Olomouc 771 46, Olomouc, Czech Republic
| | - Jindřich Fanfrlík
- Institute
of Organic Chemistry and Biochemistry (IOCB), Academy of Sciences of the Czech Republic, v.v.i.,
Gilead Sciences and IOCB Research Center, Flemingovo nám. 2, 166 10, Prague 6, Czech Republic
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11
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Brynda J, Mader P, Šícha V, Fábry M, Poncová K, Bakardiev M, Grüner B, Cígler P, Řezáčová P. Carborane-Based Carbonic Anhydrase Inhibitors. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201307583] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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12
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Gitto R, Damiano FM, Mader P, De Luca L, Ferro S, Supuran CT, Vullo D, Brynda J, Řezáčová P, Chimirri A. Synthesis, Structure–Activity Relationship Studies, and X-ray Crystallographic Analysis of Arylsulfonamides as Potent Carbonic Anhydrase Inhibitors. J Med Chem 2012; 55:3891-9. [DOI: 10.1021/jm300112w] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Rosaria Gitto
- Dipartimento Farmaco-Chimico, Università di Messina, Viale Annunziata, I-98168
Messina, Italy
| | - Francesca M. Damiano
- Dipartimento Farmaco-Chimico, Università di Messina, Viale Annunziata, I-98168
Messina, Italy
| | - Pavel Mader
- Department
of Structural Biology, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Laura De Luca
- Dipartimento Farmaco-Chimico, Università di Messina, Viale Annunziata, I-98168
Messina, Italy
| | - Stefania Ferro
- Dipartimento Farmaco-Chimico, Università di Messina, Viale Annunziata, I-98168
Messina, Italy
| | - Claudiu T. Supuran
- Università degli Studi
di Firenze, Polo Scientifico, Laboratorio di Chimica Bioinorganica, Università di Firenze, Italy
| | - Daniela Vullo
- Università degli Studi
di Firenze, Polo Scientifico, Laboratorio di Chimica Bioinorganica, Università di Firenze, Italy
| | - Jiří Brynda
- Department
of Structural Biology, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
- Structural Biology Team, Institute
of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Pavlína Řezáčová
- Department
of Structural Biology, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
- Structural Biology Team, Institute
of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Alba Chimirri
- Dipartimento Farmaco-Chimico, Università di Messina, Viale Annunziata, I-98168
Messina, Italy
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13
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Mader P, Brynda J, Gitto R, Agnello S, Pachl P, Supuran CT, Chimirri A, Řezáčová P. Structural Basis for the Interaction Between Carbonic Anhydrase and 1,2,3,4-tetrahydroisoquinolin-2-ylsulfonamides. J Med Chem 2011; 54:2522-6. [DOI: 10.1021/jm2000213] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pavel Mader
- Department of Structural Biology, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Jiří Brynda
- Department of Structural Biology, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
- Structural Biology Team, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Rosaria Gitto
- Dipartimento Farmaco-Chimico, Università di Messina, Messina, Italy
| | - Stefano Agnello
- Dipartimento Farmaco-Chimico, Università di Messina, Messina, Italy
| | - Petr Pachl
- Department of Structural Biology, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Claudiu T. Supuran
- Laboratorio di Chimica Bioinorganica, Università degli Studi di Firenze, Firenze, Italy
| | - Alba Chimirri
- Dipartimento Farmaco-Chimico, Università di Messina, Messina, Italy
| | - Pavlína Řezáčová
- Department of Structural Biology, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
- Structural Biology Team, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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14
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Skultety L, Jankovicova B, Svobodova Z, Mader P, Rezacova P, Dubrovcakova M, Lakota J, Bilkova Z. Identification of carbonic anhydrase I immunodominant epitopes recognized by specific autoantibodies which indicate an improved prognosis in patients with malignancy after autologous stem cell transplantation. J Proteome Res 2010; 9:5171-9. [PMID: 20681519 DOI: 10.1021/pr1004778] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
This work employs an epitope mapping of carbonic anhydrase (CA), isoform I (CA I), for detection of the main immunodominant epitopes. Our interest has arisen from an observed spontaneous tumor regression in patients who developed an aplastic anemia type syndrome after a high-dose therapy with autologous stem cell transplantation and whose sera contained high titer of anti carbonic anhydrase (anti-CA) autoantibodies. There are many indications that the presence of these autoantibodies may provide significant survival benefit for the patients. Western blot analysis confirmed strong immunoreactivity of the patients' sera with several CA isoforms and the CA I has been selected for our study as a highly abundant and widely distributed isoform. The applied analytical approach consists of specific fragmentation of CA I protein followed by immunospecific isolation of peptides reacting with polyclonal anti-CA I autoantibodies of patients in spontaneous remission. We improved the standard epitope mapping schema by incorporating the benefits of magnetic carriers and biomagnetic separation techniques. Mass spectrometry has been applied for detection and identification of epitopes and the acquired results were verified by bioinformatic tools. The candidate epitopes of CA I (NVGHS, DGLAV, SSEQL, and SLKPI) are discussed herein as potential therapeutic targets. This work highlights the usefulness of the epitope mapping technique based on magnetic microspheres for effective and rapid determination of immunodominant epitopes of the target protein.
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Affiliation(s)
- Ludovit Skultety
- Institute of Virology, Slovak Academy of Sciences, Bratislava, Slovakia
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15
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Gitto R, Agnello S, Ferro S, De Luca L, Vullo D, Brynda J, Mader P, Supuran CT, Chimirri A. Identification of 3,4-Dihydroisoquinoline-2(1H)-sulfonamides as Potent Carbonic Anhydrase Inhibitors: Synthesis, Biological Evaluation, and Enzyme−Ligand X-ray Studies. J Med Chem 2010; 53:2401-8. [DOI: 10.1021/jm9014026] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Rosaria Gitto
- Dipartimento Farmaco-Chimico, Università di Messina, Viale Annunziata, I-98168 Messina, Italy
| | - Stefano Agnello
- Dipartimento Farmaco-Chimico, Università di Messina, Viale Annunziata, I-98168 Messina, Italy
| | - Stefania Ferro
- Dipartimento Farmaco-Chimico, Università di Messina, Viale Annunziata, I-98168 Messina, Italy
| | - Laura De Luca
- Dipartimento Farmaco-Chimico, Università di Messina, Viale Annunziata, I-98168 Messina, Italy
| | - Daniela Vullo
- Laboratorio di Chimica Bioinorganica, Università degli Studi di Firenze, Firenze, Italy
| | - Jiri Brynda
- Department of Structural Biology, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, CZ-16637 Prague, Czech Republic
- Department of Structural Biology, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, CZ-16637 Prague, Czech Republic
| | - Pavel Mader
- Department of Structural Biology, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, CZ-16637 Prague, Czech Republic
- Department of Structural Biology, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, CZ-16637 Prague, Czech Republic
| | - Claudiu T. Supuran
- Laboratorio di Chimica Bioinorganica, Università degli Studi di Firenze, Firenze, Italy
| | - Alba Chimirri
- Dipartimento Farmaco-Chimico, Università di Messina, Viale Annunziata, I-98168 Messina, Italy
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16
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Brynda J, Pachl P, Rosenberg I, Mader P. Structure-based drug design of selective 5′-nucleotidases inhibitors. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308079191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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17
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Král V, Mader P, Collard R, Fábry M, Hořejší M, Řezáčová P, Kožíšek M, Závada J, Sedláček J, Rulíšek L, Brynda J. Stabilization of antibody structure upon association to a human carbonic anhydrase IX epitope studied by X-ray crystallography, microcalorimetry, and molecular dynamics simulations. Proteins 2007; 71:1275-87. [DOI: 10.1002/prot.21821] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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18
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Mader P, Kolthoff IM. Kinetic waves in systems containing cobalt(II) and cysteine-like compounds. Adsorption phenomena in the cystamine-cobalt(II) system in borax medium. Anal Chem 2002. [DOI: 10.1021/ac60276a009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Kolthoff IM, Mader P. Kinetic waves in systems containing cobalt(II) and cysteine-like compounds. Polarographic catalytic hydrogen waves in acid solutions of mercaptoanilines in the presence of cobalt(II) or -(III). Anal Chem 2002. [DOI: 10.1021/ac60276a010] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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20
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Mader P, Veselá V, Dorčák V, Heyrovský M. The "Presodium" Hydrogen Evolution at the Dropping Mercury Electrode Catalysed by Simple Cysteine Peptides. ACTA ACUST UNITED AC 2001. [DOI: 10.1135/cccc20010397] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
"Presodium" catalytic currents at dropping mercury electrode of cysteine, cysteinylglycine, γ-glutamylcysteine and reduced glutathione were systematically studied in weakly alkaline solutions. They consist in shifts to positive potentials of current due to reduction of the blank solution, and, under some conditions, also in formation of "catalytic prewaves". The two cases have been qualitatively interpreted as based on a suggested common mechanism, differing by the occurrence of weak catalyst adsorption in the prewave case. The catalytic activity depends on the catalyst itself (concentration, structure, conformation at the electrode, partial protonation/ionisation, partial hydrophobic/hydrophilic character) as well as on the solution (pH, ionic strength, nature and concentration of components).
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21
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Gälweiler L, Conlan RS, Mader P, Palme K, Moore I. Technical advance: the DNA-binding activity of gal4 is inhibited by methylation of the gal4 binding site in plant chromatin. Plant J 2000; 23:143-157. [PMID: 10929109 DOI: 10.1046/j.1365-313x.2000.00805.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Derivatives of the Saccharomyces cerevisiae transcription factor Gal4 which act as effective transcription activators in yeast, Drosophila, mammalian cells and plant protoplasts are shown to direct expression from a GUS reporter construct when expressed in transgenic tobacco. However, in comparison to 35S-GUS controls, Gal4-mediated expression of the reporter gene was relatively weak and extremely variable. GUS expression was lost as plants matured and it was almost undetectable in most of their progeny. Gal4-mediated gene expression could be restored by treating tissues with 5-aza-cytidine, implicating cytosine methylation in the loss of Gal4-mediated expression. Restoration of reporter expression was not accompanied by an increase in steady-state levels of the activator transcript. We propose that the DNA-binding activity of Gal4 is sensitive to methylation of its binding site in plant chromatin. The Gal4-DNA co-crystal predicts that 5-methylcytosine at either of the outer two positions of the binding site will effectively prevent Gal4 binding. We show that these positions become extensively methylated in transgenic plants and that methylation of Gal4-binding sites interferes with Gal4 binding in vitro. These observations suggest that the Gal4 DNA-binding domain is intrinsically sensitive to cytosine methylation and that, despite the success of Gal4-based expression systems in yeast and Drosophila, Gal4 is not ideal for use in plant gene expression technology.
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Affiliation(s)
- L Gälweiler
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK
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22
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Sestáková I, Mader P. Voltammetry on mercury and carbon electrodes as a tool for studies of metallothionein interactions with metal ions. Cell Mol Biol (Noisy-le-grand) 2000; 46:257-67. [PMID: 10774918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Rabbit liver Cd-metallothionein (CdMT) and Cd-complex of synthetically prepared pentapeptide (gamma-Glu-Cys)2-Gly were studied as examples of animal and plant metallothioneins. Using hanging mercury electrode, cathodic stripping voltammetry after adsorptive accumulation of the Cd(II)-SR complex at different potentials, is suitable for estimating changes occurring in metal coordination due to the presence of metal ions such as Zn2+, Cu2+, Hg2+ or excessive Cd2+. Conditions under which similar behaviour can be observed for both CdMT and Cd-pentapeptide complex are specified. On carbon electrodes, detailed study of reduction processes of Cd(II)-SR complexes is prevented by occurrence of a large catalytic current; oxidation processes are more suitable for study at these electrodes. Carbon composite paste electrode (10% SiO2) allows deposition of Cd(II)-SR complex during its reduction, as was demonstrated with Cd-cysteine, CdMT or Cd-pentapeptide complex. After deposition, oxidation peak of the uncomplexed Cd2+ ions and one or two oxidation peaks corresponding to a formation of the RS-Cd(II) complex are observed. Also, similarly as on Hg electrode, it was observed that excessive Cd2+ or Zn2+ ions influence oxidation peaks of the RS-Cd(II) complex formation. Combination of measurements on mercury electrode and composite paste electrode is recommended for studies of metallothionein interactions with metal ions or other metal complexes.
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Affiliation(s)
- I Sestáková
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Prague.
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23
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24
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Mader P, Száková J, Miholová D. Classical dry ashing of biological and agricultural materials. Part II. Losses of analytes due to their retention in an insoluble residue. ACTA ACUST UNITED AC 1998. [DOI: 10.1051/analusis:1998121] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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25
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26
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Kucera J, Obrusník I, Fuksa JK, Veselý J, Stastný K, Hajslová J, Mader P, Miholová D, Sysalová J. Environmental specimen banking in the Czech Republic: a pilot study. Chemosphere 1997; 34:1975-1987. [PMID: 9159899 DOI: 10.1016/s0045-6535(97)00059-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
In recognition of the importance of environmental specimen banking (ESB) as an important component of the described ongoing real-time environmental and health-related monitoring programmes, a proposal for a planned ESB pilot study in the Czech Republic is presented. Selection of biomonitors, analytes, sampling techniques and sites is discussed, especially with regard to the possible harmonization with ESB already operational abroad. Availability of validated analytical techniques for determination of up to 30 elements using nuclear and spectroscopic techniques, including speciation of several metals, and of the most important organic pollutants employing various chromatographic techniques in biological and environmental samples is demonstrated.
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Affiliation(s)
- J Kucera
- Nuclear Physics Institute, Prague, Czech Republic
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27
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Goessler W, Lintschinger J, Sz�kov� J, Mader P, Kopeck� J, Doucha J, Irgolic KJ. Chlorella sp. and Arsenic Compounds: An Attempt to Prepare an Algal Reference Material for Arsenic Compounds. Appl Organomet Chem 1997. [DOI: 10.1002/(sici)1099-0739(199701)11:1<57::aid-aoc540>3.0.co;2-j] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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28
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Mader P, Stejskalov� I, Sl�mov� A. Dried biomass of green algae and its matrix matching with green parts of higher plants. Anal Bioanal Chem 1995. [DOI: 10.1007/bf00322312] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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29
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Šestáková I, Miholová D, Slámová A, Mader P, Száková J. Determination of CD, CU, and PB in animal tissues—comparison of electrochemical results obtained with a new polarographic system and atomic spectroscopy. ELECTROANAL 1994. [DOI: 10.1002/elan.1140061124] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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30
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31
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Abstract
The preparation of internal reference material NSC-21 Compost Vitahum, including its stabilization, homogeneity testing, and evaluation of an interlaboratory comparison in which 19 laboratories took part using several analytical methods is described. From the results of the intercomparison, consensus values were derived for the contents of Cd, Cu, Ni, Pb, and Zn, whereas for As, Co, Cr, Fe, Hg and Mn, information values were derived. Bimodal distribution of the As and Cr results was obtained, presumably because of incomplete dissolution of the elements from the matrix if insufficiently aggressive decomposition procedures were employed. Some problems encountered were elucidated by application of neutron activation analysis (NAA) in its nondestructive and destructive (radiochemical) modes.
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Affiliation(s)
- P Mader
- University of Agriculture, Faculty of Agronomy, Prague, Czech Republic
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32
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Miholová D, Mader P, Száková J, Slámová A, Svatoš Z. Czechoslovakian biological certified reference materials and their use in the analytical quality assurance system in a trace element laboratory. ACTA ACUST UNITED AC 1993. [DOI: 10.1007/bf00322606] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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33
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Cibulka J, Mader P. [Present problems of environmental contamination with so-called heavy metals]. Cas Lek Cesk 1990; 129:993-7. [PMID: 2208241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Till recently the true state and quality of the environment was kept secret. False pretension of a better state is one of the reasons not only for the poor state of our living environment but also for the poor health status of the population. The authors discuss the contemporary process of contamination and pollution of the environment as a result of economic activities and pays special attention to so-called heavy metals.
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Affiliation(s)
- J Cibulka
- Katedra fyziologie a zoologie Vysoké skoly zemĕdĕlské, Praha
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34
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Colin J, Mimouni F, Robinet A, Conrad H, Mader P. The surgical treatment of high myopia: comparison of epikeratoplasty, keratomileusis and minus power anterior chamber lenses. Refract Corneal Surg 1990; 6:245-51. [PMID: 2268585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Seventy high myopic eyes (-8.00 to -28.00 diopters) with epikeratoplasty (n = 29), myopic non-freeze keratomileusis (n = 26) or minus power anterior chamber intraocular lenses in phakic eyes (n = 15) were operated by two surgeons and were evaluated retrospectively. Results are reported at the 6-month postoperative interval. Eyes treated with epikeratoplasty had an average preoperative spherical equivalent of the cycloplegic refraction of -17.80 D (range -12.00 to -28.00 D). At 6 months, 66.6% of eyes were within 3 D of emmetropia and 7.4% of eyes had an uncorrected visual acuity of 20/40 or more. Average preoperative spectacle visual acuity was 20/50 (0.39); it was 20/50 (0.37) at both 6 and 24 months. Between 6 and 24 months, 32.2% of eyes had a change in refraction of 1.00 D or more. Two lenticules were removed. Eyes treated with non-freeze keratomileusis had an average preoperative refraction of -10.0 D (range -8 to -15 D). At 6 months, 61.5% of eyes were within 3.00 D of emmetropia and 30.7% of eyes had an uncorrected visual acuity of 20/40 or better. Average preoperative spectacle visual acuity was 20/30 (0.67), and 6 and 12 months afterward it was 20/30-20/40 (0.57) and 20/30 (0.66) respectively. Between 6 and 12 months, 8.3% of eyes, had a change in refraction of 1.00 D or more. Eyes treated with minus power anterior chamber lenses had an average preoperative refraction of -17.30 D (range -12.50 to -20.00 D).(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- J Colin
- Department of Ophthalmology, Brest University Hospital, France
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35
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Kučera J, Mader P, Miholová D, Cibulka J, Poláková M, Kordík D. Preparation of the bovine liver 12-02-01 reference material and the certification of element contents from an interlaboratory comparison. ACTA ACUST UNITED AC 1990. [DOI: 10.1007/bf00322788] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
Small changes in the molecules of the oxytocin and vasopressin synthetic analogs bring about considerable changes in their polarographic behaviour within the entire potential interval available (+0·5 to -2·0 V VS SCE). In the study of the polarographic activity of ten peptides we used classical, differential pulse and alternating current polarography and cyclic voltammetry. Liquid chromatographic separation studies of the peptides on the reverse phase complemented the electrochemical investigation. Hydrophobicity showed to be the parameter which decisively influences the polarographic behaviour of the studied peptides. Strong interaction of the SS and S-carba analogs with the electrode material (mercury) has been observed and surface activity of the SH-forms of the peptides at negative potentials has been confirmed. The importance of various functional groups in the peptide molecule for the catalytic activity in hydrogen evolution at negative potentials is discussed.
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37
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Colin J, Mader P, Bonissent JF. [Technic of epikeratoplasty]. Bull Soc Ophtalmol Fr 1988; 88:137-8. [PMID: 3048750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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38
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Colin J, Mader P, Volant A, Eloy R, Charleux J, Dupont D, Cravagna P, Tardy M, Tayot JC. [Surgery of refractive disorders. Use of lenses composed of human placental collagen]. Presse Med 1987; 16:913-4. [PMID: 2954128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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39
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Cibulka J, Trefný D, Sova Z, Mader P, Muzikár V, Podhorský M, Lávicka M. [Experimental control of the process of lead absorption and deposition in domestic ducks]. VET MED-CZECH 1986; 31:739-46. [PMID: 3101270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
A trial was conducted with 40 domestic ducks of the White Pekin breed at the age of 40 days: thirty pieces of lead shot were introduced as a single dose in the gizzard. The process of lead resorption and deposition was found not to be significantly influenced by the therapeutic treatments nor changes in the composition of feed. A week after the administration of shot a significant increase was recorded in the content of lead to 4.32 mg in liver, to 11.36 mg in kidney and to 1.15 mg in muscle (the respective values for the control animals were 0.07, 0.11 and 0.06 mg per kg). At the end of the trial after three weeks of treatment and administration of experimental diets, no significant differences were recorded in lead content in liver, kidney and muscle between the untreated and treated ducks nor ducks fed experimental diets.
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40
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Mader P, Kolthoff I, Veselá V. Catalytic hydrogen activity of the low-molecular weight thiols: kinetic control of the brdička catalytic current. Electrochim Acta 1982. [DOI: 10.1016/0013-4686(82)80029-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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41
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Mader P. [Studies on marginal seal of the silicate cement LAW]. Dtsch Stomatol 1972; 22:272-7. [PMID: 4503721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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42
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Mader P. Polarographic investigation of systems containing cobalt(II) and cysteine-like compounds with special reference to their ability to facilitate hydrogen evolution from buffered aqueous solutions. ACTA ACUST UNITED AC 1971. [DOI: 10.1135/cccc19711035] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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43
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Mader P, Volke J, Kůta J. Polarographic study of the non-catalyzed autoxidation of cystine in a mildly alkaline buffered medium. ACTA ACUST UNITED AC 1970. [DOI: 10.1135/cccc19700552] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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44
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Mader P. [Removable fixation appliances for treatment of periodontopathies]. Zahnarztl Welt Zahnarztl Rundsch ZWR Zahnarztl Reform 1968; 69:620-7. [PMID: 4878875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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45
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46
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Mader P, Kůta J, Volke J. Über die Bildung von Kupfer(I)-cysteinat bei der polarographischen Reduktion des Komplexes Cu(II)-EDTA in Anwesenheit von Cystin und seine hemmende Wirkung auf die Reduktion des Komplexonats. ACTA ACUST UNITED AC 1968. [DOI: 10.1135/cccc19683625] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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47
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Mader P. [The construction of partial cast prosthesis according to Greifer's system]. Zahnarztl Welt Zahnarztl Rundsch ZWR Zahnarztl Reform 1967; 68:838-41 concl. [PMID: 4864841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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