1
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Bothe U, Günther J, Nubbemeyer R, Siebeneicher H, Ring S, Bömer U, Peters M, Rausch A, Denner K, Himmel H, Sutter A, Terebesi I, Lange M, Wengner AM, Guimond N, Thaler T, Platzek J, Eberspächer U, Schäfer M, Steuber H, Zollner TM, Steinmeyer A, Schmidt N. Discovery of IRAK4 Inhibitors BAY1834845 (Zabedosertib) and BAY1830839. J Med Chem 2024; 67:1225-1242. [PMID: 38228402 PMCID: PMC10823478 DOI: 10.1021/acs.jmedchem.3c01714] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 12/01/2023] [Accepted: 12/04/2023] [Indexed: 01/18/2024]
Abstract
Interleukin-1 receptor-associated kinase 4 (IRAK4) plays a critical role in innate inflammatory processes. Here, we describe the discovery of two clinical candidate IRAK4 inhibitors, BAY1834845 (zabedosertib) and BAY1830839, starting from a high-throughput screening hit derived from Bayer's compound library. By exploiting binding site features distinct to IRAK4 using an in-house docking model, liabilities of the original hit could surprisingly be overcome to confer both candidates with a unique combination of good potency and selectivity. Favorable DMPK profiles and activity in animal inflammation models led to the selection of these two compounds for clinical development in patients.
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Affiliation(s)
- Ulrich Bothe
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
| | - Judith Günther
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
| | | | | | - Sven Ring
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
| | | | - Michaele Peters
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
| | | | - Karsten Denner
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
| | - Herbert Himmel
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
| | - Andreas Sutter
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
| | - Ildiko Terebesi
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
| | | | - Antje M. Wengner
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
| | - Nicolas Guimond
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
| | - Tobias Thaler
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
| | - Johannes Platzek
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
| | - Uwe Eberspächer
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
| | | | | | - Thomas M. Zollner
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
| | - Andreas Steinmeyer
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
| | - Nicole Schmidt
- Bayer AG, Research &
Development, Pharmaceuticals, 13353 Berlin, Germany
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2
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Göricke F, Vu V, Smith L, Scheib U, Böhm R, Akkilic N, Wohlfahrt G, Weiske J, Bömer U, Brzezinka K, Lindner N, Lienau P, Gradl S, Beck H, Brown PJ, Santhakumar V, Vedadi M, Barsyte-Lovejoy D, Arrowsmith CH, Schmees N, Petersen K. Discovery and Characterization of BAY-805, a Potent and Selective Inhibitor of Ubiquitin-Specific Protease USP21. J Med Chem 2023; 66:3431-3447. [PMID: 36802665 PMCID: PMC10009755 DOI: 10.1021/acs.jmedchem.2c01933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
USP21 belongs to the ubiquitin-specific protease (USP) subfamily of deubiquitinating enzymes (DUBs). Due to its relevance in tumor development and growth, USP21 has been reported as a promising novel therapeutic target for cancer treatment. Herein, we present the discovery of the first highly potent and selective USP21 inhibitor. Following high-throughput screening and subsequent structure-based optimization, we identified BAY-805 to be a non-covalent inhibitor with low nanomolar affinity for USP21 and high selectivity over other DUB targets as well as kinases, proteases, and other common off-targets. Furthermore, surface plasmon resonance (SPR) and cellular thermal shift assays (CETSA) demonstrated high-affinity target engagement of BAY-805, resulting in strong NF-κB activation in a cell-based reporter assay. To the best of our knowledge, BAY-805 is the first potent and selective USP21 inhibitor and represents a valuable high-quality in vitro chemical probe to further explore the complex biology of USP21.
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Affiliation(s)
- Fabian Göricke
- Research & Development, Pharmaceuticals, Bayer AG, 42096 Wuppertal, Germany
| | - Victoria Vu
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Leanna Smith
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Ulrike Scheib
- Nuvisan Innovation Campus Berlin, 13353 Berlin, Germany
| | - Raphael Böhm
- Nuvisan Innovation Campus Berlin, 13353 Berlin, Germany
| | - Namik Akkilic
- Nuvisan Innovation Campus Berlin, 13353 Berlin, Germany
| | - Gerd Wohlfahrt
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Jörg Weiske
- Nuvisan Innovation Campus Berlin, 13353 Berlin, Germany
| | - Ulf Bömer
- Nuvisan Innovation Campus Berlin, 13353 Berlin, Germany
| | | | - Niels Lindner
- Research & Development, Pharmaceuticals, Bayer AG, 42096 Wuppertal, Germany
| | - Philip Lienau
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Stefan Gradl
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Hartmut Beck
- Research & Development, Pharmaceuticals, Bayer AG, 42096 Wuppertal, Germany
| | - Peter J Brown
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | | | - Masoud Vedadi
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada.,Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Dalia Barsyte-Lovejoy
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Cheryl H Arrowsmith
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | | | - Kirstin Petersen
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
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3
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Böhnke N, Berger M, Griebenow N, Rottmann A, Erkelenz M, Hammer S, Berndt S, Günther J, Wengner AM, Stelte-Ludwig B, Mahlert C, Greven S, Dietz L, Jörißen H, Barak N, Bömer U, Hillig RC, Eberspaecher U, Weiske J, Giese A, Mumberg D, Nising CF, Weinmann H, Sommer A. A Novel NAMPT Inhibitor-Based Antibody-Drug Conjugate Payload Class for Cancer Therapy. Bioconjug Chem 2022; 33:1210-1221. [PMID: 35658441 PMCID: PMC9204702 DOI: 10.1021/acs.bioconjchem.2c00178] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [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: 12/15/2022]
Abstract
Inhibition of intracellular nicotinamide phosphoribosyltransferase (NAMPT) represents a new mode of action for cancer-targeting antibody-drug conjugates (ADCs) with activity also in slowly proliferating cells. To extend the repertoire of available effector chemistries, we have developed a novel structural class of NAMPT inhibitors as ADC payloads. A structure-activity relationship-driven approach supported by protein structural information was pursued to identify a suitable attachment point for the linker to connect the NAMPT inhibitor with the antibody. Optimization of scaffolds and linker structures led to highly potent effector chemistries which were conjugated to antibodies targeting C4.4a (LYPD3), HER2 (c-erbB2), or B7H3 (CD276) and tested on antigen-positive and -negative cancer cell lines. Pharmacokinetic studies, including metabolite profiling, were performed to optimize the stability and selectivity of the ADCs and to evaluate potential bystander effects. Optimized NAMPTi-ADCs demonstrated potent in vivo antitumor efficacy in target antigen-expressing xenograft mouse models. This led to the development of highly potent NAMPT inhibitor ADCs with a very good selectivity profile compared with the corresponding isotype control ADCs. Moreover, we demonstrate─to our knowledge for the first time─the generation of NAMPTi payload metabolites from the NAMPTi-ADCs in vitro and in vivo. In conclusion, NAMPTi-ADCs represent an attractive new payload class designed for use in ADCs for the treatment of solid and hematological cancers.
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Affiliation(s)
- Niels Böhnke
- Bayer AG, Pharmaceuticals, Berlin 13353, Germany
| | | | | | | | | | | | | | | | | | | | | | | | - Lisa Dietz
- Bayer AG, Pharmaceuticals, Wuppertal 42113, Germany
| | | | - Naomi Barak
- Bayer AG, Pharmaceuticals, Berlin 13353, Germany
| | - Ulf Bömer
- Bayer AG, Pharmaceuticals, Berlin 13353, Germany
| | | | | | - Jörg Weiske
- Bayer AG, Pharmaceuticals, Berlin 13353, Germany
| | - Anja Giese
- Bayer AG, Pharmaceuticals, Berlin 13353, Germany
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4
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Berger M, Wortmann L, Buchgraber P, Lücking U, Zitzmann-Kolbe S, Wengner AM, Bader B, Bömer U, Briem H, Eis K, Rehwinkel H, Bartels F, Moosmayer D, Eberspächer U, Lienau P, Hammer S, Schatz CA, Wang Q, Wang Q, Mumberg D, Nising CF, Siemeister G. BAY-8400: A Novel Potent and Selective DNA-PK Inhibitor which Shows Synergistic Efficacy in Combination with Targeted Alpha Therapies. J Med Chem 2021; 64:12723-12737. [PMID: 34428039 DOI: 10.1021/acs.jmedchem.1c00762] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Eukaryotes have evolved two major pathways to repair potentially lethal DNA double-strand breaks. Homologous recombination represents a precise, DNA-template-based mechanism available during the S and G2 cell cycle phase, whereas non-homologous end joining, which requires DNA-dependent protein kinase (DNA-PK), allows for fast, cell cycle-independent but less accurate DNA repair. Here, we report the discovery of BAY-8400, a novel selective inhibitor of DNA-PK. Starting from a triazoloquinoxaline, which had been identified as a hit from a screen for ataxia telangiectasia and Rad3-related protein (ATR) inhibitors with inhibitory activity against ATR, ATM, and DNA-PK, lead optimization efforts focusing on potency and selectivity led to the discovery of BAY-8400. In in vitro studies, BAY-8400 showed synergistic activity of DNA-PK inhibition with DNA damage-inducing targeted alpha therapy. Combination of PSMA-targeted thorium-227 conjugate BAY 2315497 treatment of human prostate tumor-bearing mice with BAY-8400 oral treatment increased antitumor efficacy, as compared to PSMA-targeted thorium-227 conjugate monotherapy.
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Affiliation(s)
- Markus Berger
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Lars Wortmann
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Philipp Buchgraber
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Ulrich Lücking
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | | | - Antje M Wengner
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Benjamin Bader
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Ulf Bömer
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Hans Briem
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Knut Eis
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Hartmut Rehwinkel
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Florian Bartels
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Dieter Moosmayer
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Uwe Eberspächer
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Philip Lienau
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Stefanie Hammer
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Christoph A Schatz
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Qiuwen Wang
- Pharmaron Beijing Co., Ltd., 6 Taihe Road, BDA, Beijing 100176, P. R. China
| | - Qi Wang
- WuXi AppTec (Wuhan) Co., Ltd., 666 Gaoxin Road, East Lake High-tech Development Zone, Wuhan 430075, P. R. China
| | - Dominik Mumberg
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Carl F Nising
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
| | - Gerhard Siemeister
- Research & Development, Pharmaceuticals, Bayer AG, Berlin 13353, Germany
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5
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Lücking U, Kosemund D, Böhnke N, Lienau P, Siemeister G, Denner K, Bohlmann R, Briem H, Terebesi I, Bömer U, Schäfer M, Ince S, Mumberg D, Scholz A, Izumi R, Hwang S, von Nussbaum F. Changing for the Better: Discovery of the Highly Potent and Selective CDK9 Inhibitor VIP152 Suitable for Once Weekly Intravenous Dosing for the Treatment of Cancer. J Med Chem 2021; 64:11651-11674. [PMID: 34264057 DOI: 10.1021/acs.jmedchem.1c01000] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Selective inhibition of exclusively transcription-regulating positive transcription elongation factor b/CDK9 is a promising new approach in cancer therapy. Starting from atuveciclib, the first selective CDK9 inhibitor to enter clinical development, lead optimization efforts aimed at identifying intravenously (iv) applicable CDK9 inhibitors with an improved therapeutic index led to the discovery of the highly potent and selective clinical candidate VIP152. The evaluation of various scaffold hops was instrumental in the identification of VIP152, which is characterized by the underexplored benzyl sulfoximine group. VIP152 exhibited the best preclinical overall profile in vitro and in vivo, including high efficacy and good tolerability in xenograft models in mice and rats upon once weekly iv administration. VIP152 has entered clinical trials for the treatment of cancer with promising longterm, durable monotherapy activity in double-hit diffuse large B-cell lymphoma patients.
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Affiliation(s)
- Ulrich Lücking
- Pharmaceuticals, Research and Development, Bayer Pharma AG, Müllerstr. 178, Berlin 13353, Germany
| | - Dirk Kosemund
- Pharmaceuticals, Research and Development, Bayer Pharma AG, Müllerstr. 178, Berlin 13353, Germany
| | - Niels Böhnke
- Pharmaceuticals, Research and Development, Bayer Pharma AG, Müllerstr. 178, Berlin 13353, Germany
| | - Philip Lienau
- Pharmaceuticals, Research and Development, Bayer Pharma AG, Müllerstr. 178, Berlin 13353, Germany
| | - Gerhard Siemeister
- Pharmaceuticals, Research and Development, Bayer Pharma AG, Müllerstr. 178, Berlin 13353, Germany
| | - Karsten Denner
- Pharmaceuticals, Research and Development, Bayer Pharma AG, Müllerstr. 178, Berlin 13353, Germany
| | - Rolf Bohlmann
- Pharmaceuticals, Research and Development, Bayer Pharma AG, Müllerstr. 178, Berlin 13353, Germany
| | - Hans Briem
- Pharmaceuticals, Research and Development, Bayer Pharma AG, Müllerstr. 178, Berlin 13353, Germany
| | - Ildiko Terebesi
- Pharmaceuticals, Research and Development, Bayer Pharma AG, Müllerstr. 178, Berlin 13353, Germany
| | - Ulf Bömer
- Pharmaceuticals, Research and Development, Bayer Pharma AG, Müllerstr. 178, Berlin 13353, Germany
| | - Martina Schäfer
- Pharmaceuticals, Research and Development, Bayer Pharma AG, Müllerstr. 178, Berlin 13353, Germany
| | - Stuart Ince
- Pharmaceuticals, Research and Development, Bayer Pharma AG, Müllerstr. 178, Berlin 13353, Germany
| | - Dominik Mumberg
- Pharmaceuticals, Research and Development, Bayer Pharma AG, Müllerstr. 178, Berlin 13353, Germany
| | - Arne Scholz
- Pharmaceuticals, Research and Development, Bayer Pharma AG, Müllerstr. 178, Berlin 13353, Germany
| | - Raquel Izumi
- Vincerx Pharma, Inc., 260 Sheridan Avenue, Suite 400, Palo Alto, California 94306, United States
| | - Stuart Hwang
- Vincerx Pharma, Inc., 260 Sheridan Avenue, Suite 400, Palo Alto, California 94306, United States
| | - Franz von Nussbaum
- Pharmaceuticals, Research and Development, Bayer Pharma AG, Müllerstr. 178, Berlin 13353, Germany
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6
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Lemos C, Schulze VK, Baumgart SJ, Nevedomskaya E, Heinrich T, Lefranc J, Bader B, Christ CD, Briem H, Kuhnke LP, Holton SJ, Bömer U, Lienau P, von Nussbaum F, Nising CF, Bauser M, Hägebarth A, Mumberg D, Haendler B. The potent AMPK inhibitor BAY-3827 shows strong efficacy in androgen-dependent prostate cancer models. Cell Oncol (Dordr) 2021; 44:581-594. [PMID: 33492659 DOI: 10.1007/s13402-020-00584-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/16/2020] [Indexed: 12/14/2022] Open
Abstract
PURPOSE 5' adenosine monophosphate-activated kinase (AMPK) is an essential regulator of cellular energy homeostasis and has been associated with different pathologies, including cancer. Precisely defining the biological role of AMPK necessitates the availability of a potent and selective inhibitor. METHODS High-throughput screening and chemical optimization were performed to identify a novel AMPK inhibitor. Cell proliferation and mechanistic assays, as well as gene expression analysis and chromatin immunoprecipitation were used to investigate the cellular impact as well as the crosstalk between lipid metabolism and androgen signaling in prostate cancer models. Also, fatty acid turnover was determined by examining lipid droplet formation. RESULTS We identified BAY-3827 as a novel and potent AMPK inhibitor with additional activity against ribosomal 6 kinase (RSK) family members. It displays strong anti-proliferative effects in androgen-dependent prostate cancer cell lines. Analysis of genes involved in AMPK signaling revealed that the expression of those encoding 3-hydroxy-3-methyl-glutaryl-coenzyme A reductase (HMGCR), fatty acid synthase (FASN) and 6-phosphofructo-2-kinase/fructose-2,6-biphosphatase 2 (PFKFB2), all of which are involved in lipid metabolism, was strongly upregulated by androgen in responsive models. Chromatin immunoprecipitation DNA-sequencing (ChIP-seq) analysis identified several androgen receptor (AR) binding peaks in the HMGCR and PFKFB2 genes. BAY-3827 strongly down-regulated the expression of lipase E (LIPE), cAMP-dependent protein kinase type II-beta regulatory subunit (PRKAR2B) and serine-threonine kinase AKT3 in responsive prostate cancer cell lines. Also, the expression of members of the carnitine palmitoyl-transferase 1 (CPT1) family was inhibited by BAY-3827, and this was paralleled by impaired lipid flux. CONCLUSIONS The availability of the potent inhibitor BAY-3827 will contribute to a better understanding of the role of AMPK signaling in cancer, especially in prostate cancer.
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Affiliation(s)
- Clara Lemos
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany
| | - Volker K Schulze
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany
| | - Simon J Baumgart
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany.,Bayer US LLC, Cambridge, MA, USA
| | | | - Tobias Heinrich
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany
| | - Julien Lefranc
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany.,Nuvisan Innovation Campus Berlin, Berlin, Germany
| | - Benjamin Bader
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany.,Nuvisan Innovation Campus Berlin, Berlin, Germany
| | - Clara D Christ
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany
| | - Hans Briem
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany
| | - Lara P Kuhnke
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany
| | - Simon J Holton
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany.,Nuvisan Innovation Campus Berlin, Berlin, Germany
| | - Ulf Bömer
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany.,Nuvisan Innovation Campus Berlin, Berlin, Germany
| | - Philip Lienau
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany
| | - Franz von Nussbaum
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany.,Nuvisan Innovation Campus Berlin, Berlin, Germany
| | - Carl F Nising
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany
| | - Marcus Bauser
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany.,Janssen Pharmaceuticals, Beerse, Belgium
| | - Andrea Hägebarth
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany
| | - Dominik Mumberg
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany
| | - Bernard Haendler
- Bayer AG, Research and Development, Pharmaceuticals, Berlin, Germany.
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7
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Lücking U, Wortmann L, Wengner AM, Lefranc J, Lienau P, Briem H, Siemeister G, Bömer U, Denner K, Schäfer M, Koppitz M, Eis K, Bartels F, Bader B, Bone W, Moosmayer D, Holton SJ, Eberspächer U, Grudzinska-Goebel J, Schatz C, Deeg G, Mumberg D, von Nussbaum F. Damage Incorporated: Discovery of the Potent, Highly Selective, Orally Available ATR Inhibitor BAY 1895344 with Favorable Pharmacokinetic Properties and Promising Efficacy in Monotherapy and in Combination Treatments in Preclinical Tumor Models. J Med Chem 2020; 63:7293-7325. [PMID: 32502336 DOI: 10.1021/acs.jmedchem.0c00369] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The ATR kinase plays a key role in the DNA damage response by activating essential signaling pathways of DNA damage repair, especially in response to replication stress. Because DNA damage and replication stress are major sources of genomic instability, selective ATR inhibition has been recognized as a promising new approach in cancer therapy. We now report the identification and preclinical evaluation of the novel, clinical ATR inhibitor BAY 1895344. Starting from quinoline 2 with weak ATR inhibitory activity, lead optimization efforts focusing on potency, selectivity, and oral bioavailability led to the discovery of the potent, highly selective, orally available ATR inhibitor BAY 1895344, which exhibited strong monotherapy efficacy in cancer xenograft models that carry certain DNA damage repair deficiencies. Moreover, combination treatment of BAY 1895344 with certain DNA damage inducing chemotherapy resulted in synergistic antitumor activity. BAY 1895344 is currently under clinical investigation in patients with advanced solid tumors and lymphomas (NCT03188965).
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Affiliation(s)
- Ulrich Lücking
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Lars Wortmann
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Antje M Wengner
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Julien Lefranc
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Philip Lienau
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Hans Briem
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Gerhard Siemeister
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Ulf Bömer
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Karsten Denner
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Martina Schäfer
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Marcus Koppitz
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Knut Eis
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Florian Bartels
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Benjamin Bader
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Wilhelm Bone
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Dieter Moosmayer
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Simon J Holton
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Uwe Eberspächer
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | | | - Christoph Schatz
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Gesa Deeg
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Dominik Mumberg
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Franz von Nussbaum
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
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8
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Schulze VK, Klar U, Kosemund D, Wengner AM, Siemeister G, Stöckigt D, Neuhaus R, Lienau P, Bader B, Prechtl S, Holton SJ, Briem H, Marquardt T, Schirok H, Jautelat R, Bohlmann R, Nguyen D, Fernández-Montalván AE, Bömer U, Eberspaecher U, Brüning M, Döhr O, Raschke M, Kreft B, Mumberg D, Ziegelbauer K, Brands M, von Nussbaum F, Koppitz M. Treating Cancer by Spindle Assembly Checkpoint Abrogation: Discovery of Two Clinical Candidates, BAY 1161909 and BAY 1217389, Targeting MPS1 Kinase. J Med Chem 2020; 63:8025-8042. [PMID: 32338514 DOI: 10.1021/acs.jmedchem.9b02035] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [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
Inhibition of monopolar spindle 1 (MPS1) kinase represents a novel approach to cancer treatment: instead of arresting the cell cycle in tumor cells, cells are driven into mitosis irrespective of DNA damage and unattached/misattached chromosomes, resulting in aneuploidy and cell death. Starting points for our optimization efforts with the goal to identify MPS1 inhibitors were two HTS hits from the distinct chemical series "triazolopyridines" and "imidazopyrazines". The major initial issue of the triazolopyridine series was the moderate potency of the HTS hits. The imidazopyrazine series displayed more than 10-fold higher potencies; however, in the early project phase, this series suffered from poor metabolic stability. Here, we outline the evolution of the two hit series to clinical candidates BAY 1161909 and BAY 1217389 and reveal how both clinical candidates bind to the ATP site of MPS1 kinase, while addressing different pockets utilizing different binding interactions, along with their synthesis and preclinical characterization in selected in vivo efficacy models.
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Affiliation(s)
- Volker K Schulze
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Ulrich Klar
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Dirk Kosemund
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Antje M Wengner
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Gerhard Siemeister
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Detlef Stöckigt
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Roland Neuhaus
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Philip Lienau
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Benjamin Bader
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Stefan Prechtl
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Simon J Holton
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Hans Briem
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Tobias Marquardt
- Research & Development, Pharmaceuticals, Bayer AG, 42113 Wuppertal, Germany
| | - Hartmut Schirok
- Research & Development, Pharmaceuticals, Bayer AG, 42113 Wuppertal, Germany
| | - Rolf Jautelat
- Research & Development, Pharmaceuticals, Bayer AG, 42113 Wuppertal, Germany
| | - Rolf Bohlmann
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Duy Nguyen
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | | | - Ulf Bömer
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Uwe Eberspaecher
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Michael Brüning
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Olaf Döhr
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Marian Raschke
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Bertolt Kreft
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Dominik Mumberg
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Karl Ziegelbauer
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Michael Brands
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Franz von Nussbaum
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Marcus Koppitz
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
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9
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Lefranc J, Schulze VK, Hillig RC, Briem H, Prinz F, Mengel A, Heinrich T, Balint J, Rengachari S, Irlbacher H, Stöckigt D, Bömer U, Bader B, Gradl SN, Nising CF, von Nussbaum F, Mumberg D, Panne D, Wengner AM. Discovery of BAY-985, a Highly Selective TBK1/IKKε Inhibitor. J Med Chem 2019; 63:601-612. [DOI: 10.1021/acs.jmedchem.9b01460] [Citation(s) in RCA: 18] [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: 12/26/2022]
Affiliation(s)
- Julien Lefranc
- Pharmaceuticals, Research and Development, Bayer AG, 13353 Berlin, Germany
| | | | | | - Hans Briem
- Pharmaceuticals, Research and Development, Bayer AG, 13353 Berlin, Germany
| | - Florian Prinz
- Pharmaceuticals, Research and Development, Bayer AG, 13353 Berlin, Germany
| | - Anne Mengel
- Pharmaceuticals, Research and Development, Bayer AG, 13353 Berlin, Germany
| | - Tobias Heinrich
- Pharmaceuticals, Research and Development, Bayer AG, 13353 Berlin, Germany
| | - Jozsef Balint
- ASCA GmbH (Angewandte Synthesechemie Adlershof), 12489 Berlin, Germany
| | - Srinivasan Rengachari
- Leicester Institute of Structural and Chemical Biology, Department of Molecular and Cell Biology, University of Leicester, Lancaster Road, LE1 7RH Leicester, U.K
| | - Horst Irlbacher
- Pharmaceuticals, Research and Development, Bayer AG, 13353 Berlin, Germany
| | - Detlef Stöckigt
- Pharmaceuticals, Research and Development, Bayer AG, 13353 Berlin, Germany
| | - Ulf Bömer
- Pharmaceuticals, Research and Development, Bayer AG, 13353 Berlin, Germany
| | - Benjamin Bader
- Pharmaceuticals, Research and Development, Bayer AG, 13353 Berlin, Germany
| | | | | | - Franz von Nussbaum
- Pharmaceuticals, Research and Development, Bayer AG, 13353 Berlin, Germany
| | - Dominik Mumberg
- Pharmaceuticals, Research and Development, Bayer AG, 13353 Berlin, Germany
| | - Daniel Panne
- Leicester Institute of Structural and Chemical Biology, Department of Molecular and Cell Biology, University of Leicester, Lancaster Road, LE1 7RH Leicester, U.K
- European Molecular Biology Laboratory, 38042 Grenoble, France
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10
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Wengner AM, Siemeister G, Lücking U, Lefranc J, Wortmann L, Lienau P, Bader B, Bömer U, Moosmayer D, Eberspächer U, Golfier S, Schatz CA, Baumgart SJ, Haendler B, Lejeune P, Schlicker A, von Nussbaum F, Brands M, Ziegelbauer K, Mumberg D. The Novel ATR Inhibitor BAY 1895344 Is Efficacious as Monotherapy and Combined with DNA Damage-Inducing or Repair-Compromising Therapies in Preclinical Cancer Models. Mol Cancer Ther 2019; 19:26-38. [PMID: 31582533 DOI: 10.1158/1535-7163.mct-19-0019] [Citation(s) in RCA: 109] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 07/05/2019] [Accepted: 09/27/2019] [Indexed: 11/16/2022]
Abstract
The DNA damage response (DDR) secures the integrity of the genome of eukaryotic cells. DDR deficiencies can promote tumorigenesis but concurrently may increase dependence on alternative repair pathways. The ataxia telangiectasia and Rad3-related (ATR) kinase plays a central role in the DDR by activating essential signaling pathways of DNA damage repair. Here, we studied the effect of the novel selective ATR kinase inhibitor BAY 1895344 on tumor cell growth and viability. Potent antiproliferative activity was demonstrated in a broad spectrum of human tumor cell lines. BAY 1895344 exhibited strong monotherapy efficacy in cancer xenograft models that carry DNA damage repair deficiencies. The combination of BAY 1895344 with DNA damage-inducing chemotherapy or external beam radiotherapy (EBRT) showed synergistic antitumor activity. Combination treatment with BAY 1895344 and DDR inhibitors achieved strong synergistic antiproliferative activity in vitro, and combined inhibition of ATR and PARP signaling using olaparib demonstrated synergistic antitumor activity in vivo Furthermore, the combination of BAY 1895344 with the novel, nonsteroidal androgen receptor antagonist darolutamide resulted in significantly improved antitumor efficacy compared with respective single-agent treatments in hormone-dependent prostate cancer, and addition of EBRT resulted in even further enhanced antitumor efficacy. Thus, the ATR inhibitor BAY 1895344 may provide new therapeutic options for the treatment of cancers with certain DDR deficiencies in monotherapy and in combination with DNA damage-inducing or DNA repair-compromising cancer therapies by improving their efficacy.
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Affiliation(s)
- Antje M Wengner
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany.
| | | | - Ulrich Lücking
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Julien Lefranc
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Lars Wortmann
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Philip Lienau
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Benjamin Bader
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Ulf Bömer
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Dieter Moosmayer
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Uwe Eberspächer
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Sven Golfier
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | | | - Simon J Baumgart
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Bernard Haendler
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Pascale Lejeune
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Andreas Schlicker
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | | | - Michael Brands
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Karl Ziegelbauer
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Dominik Mumberg
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
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11
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Collin MP, Lobell M, Hübsch W, Brohm D, Schirok H, Jautelat R, Lustig K, Bömer U, Vöhringer V, Héroult M, Grünewald S, Hess-Stumpp H. Discovery of Rogaratinib (BAY 1163877): a pan-FGFR Inhibitor. ChemMedChem 2018; 13:437-445. [DOI: 10.1002/cmdc.201700718] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 01/20/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Marie-Pierre Collin
- Department of Medicinal Chemistry; Drug Discovery, Bayer AG; Postfach 101709 42096 Wuppertal Germany
| | - Mario Lobell
- Department of Medicinal Chemistry; Drug Discovery, Bayer AG; Postfach 101709 42096 Wuppertal Germany
| | - Walter Hübsch
- Department of Medicinal Chemistry; Drug Discovery, Bayer AG; Postfach 101709 42096 Wuppertal Germany
| | - Dirk Brohm
- Department of Medicinal Chemistry; Drug Discovery, Bayer AG; Postfach 101709 42096 Wuppertal Germany
| | - Hartmut Schirok
- Department of Medicinal Chemistry; Drug Discovery, Bayer AG; Postfach 101709 42096 Wuppertal Germany
| | - Rolf Jautelat
- Department of Medicinal Chemistry; Drug Discovery, Bayer AG; Postfach 101709 42096 Wuppertal Germany
| | - Klemens Lustig
- Research Pharmacokinetics Group; Drug Discovery, Bayer AG; Germany
| | - Ulf Bömer
- Lead Discovery; Drug Discovery, Bayer AG; Germany
| | - Verena Vöhringer
- Therapeutic Research Group, Oncology; Drug Discovery, Bayer AG; Germany
| | - Mélanie Héroult
- Therapeutic Research Group, Oncology; Drug Discovery, Bayer AG; Germany
| | - Sylvia Grünewald
- Therapeutic Research Group, Oncology; Drug Discovery, Bayer AG; Germany
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12
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Lücking U, Scholz A, Lienau P, Siemeister G, Kosemund D, Bohlmann R, Briem H, Terebesi I, Meyer K, Prelle K, Denner K, Bömer U, Schäfer M, Eis K, Valencia R, Ince S, von Nussbaum F, Mumberg D, Ziegelbauer K, Klebl B, Choidas A, Nussbaumer P, Baumann M, Schultz-Fademrecht C, Rühter G, Eickhoff J, Brands M. Identification of Atuveciclib (BAY 1143572), the First Highly Selective, Clinical PTEFb/CDK9 Inhibitor for the Treatment of Cancer. ChemMedChem 2017; 12:1776-1793. [PMID: 28961375 PMCID: PMC5698704 DOI: 10.1002/cmdc.201700447] [Citation(s) in RCA: 95] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 09/26/2017] [Indexed: 12/25/2022]
Abstract
Selective inhibition of exclusively transcription‐regulating PTEFb/CDK9 is a promising new approach in cancer therapy. Starting from lead compound BAY‐958, lead optimization efforts strictly focusing on kinase selectivity, physicochemical and DMPK properties finally led to the identification of the orally available clinical candidate atuveciclib (BAY 1143572). Structurally characterized by an unusual benzyl sulfoximine group, BAY 1143572 exhibited the best overall profile in vitro and in vivo, including high efficacy and good tolerability in xenograft models in mice and rats. BAY 1143572 is the first potent and highly selective PTEFb/CDK9 inhibitor to enter clinical trials for the treatment of cancer.
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Affiliation(s)
- Ulrich Lücking
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Arne Scholz
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Philip Lienau
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Gerhard Siemeister
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Dirk Kosemund
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Rolf Bohlmann
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Hans Briem
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Ildiko Terebesi
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Kirstin Meyer
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Katja Prelle
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Karsten Denner
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Ulf Bömer
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Martina Schäfer
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Knut Eis
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Ray Valencia
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Stuart Ince
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Franz von Nussbaum
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Dominik Mumberg
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Karl Ziegelbauer
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
| | - Bert Klebl
- Lead Discovery Center GmbH (LDC), Otto-Hahn-Str. 15, 44227, Dortmund, Germany
| | - Axel Choidas
- Lead Discovery Center GmbH (LDC), Otto-Hahn-Str. 15, 44227, Dortmund, Germany
| | - Peter Nussbaumer
- Lead Discovery Center GmbH (LDC), Otto-Hahn-Str. 15, 44227, Dortmund, Germany
| | - Matthias Baumann
- Lead Discovery Center GmbH (LDC), Otto-Hahn-Str. 15, 44227, Dortmund, Germany
| | | | - Gerd Rühter
- Lead Discovery Center GmbH (LDC), Otto-Hahn-Str. 15, 44227, Dortmund, Germany
| | - Jan Eickhoff
- Lead Discovery Center GmbH (LDC), Otto-Hahn-Str. 15, 44227, Dortmund, Germany
| | - Michael Brands
- Bayer AG, Pharmaceuticals Division, Drug Discovery, Müllerstr. 178, 13353, Berlin, Germany
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13
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Santag S, Siegel F, Wengner AM, Lange C, Bömer U, Eis K, Pühler F, Lienau P, Bergemann L, Michels M, von Nussbaum F, Mumberg D, Petersen K. BAY 1143269, a novel MNK1 inhibitor, targets oncogenic protein expression and shows potent anti-tumor activity. Cancer Lett 2016; 390:21-29. [PMID: 28043914 DOI: 10.1016/j.canlet.2016.12.029] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 12/15/2016] [Accepted: 12/21/2016] [Indexed: 12/29/2022]
Abstract
The initiation of mRNA translation has received increasing attention as an attractive target for cancer treatment in the recent years. The oncogenic eukaryotic translation initiation factor 4E (eIF4E) is the major substrate of MAP kinase-interacting kinase 1 (MNK1), and it is located at the junction of the cancer-associated PI3K and MAPK pathways. The fact that MNK1 is linked to cell transformation and tumorigenesis renders the kinase a promising target for cancer therapy. We identified a novel small molecule MNK1 inhibitor, BAY 1143269, by high-throughput screening and lead optimization. In kinase assays, BAY 1143269 showed potent and selective inhibition of MNK1. By targeting MNK1 activity, BAY 1143269 strongly regulated downstream factors involved in cell cycle regulation, apoptosis, immune response and epithelial-mesenchymal transition in vitro or in vivo. In addition, BAY 1143269 demonstrated strong efficacy in monotherapy in cell line and patient-derived non-small cell lung cancer xenograft models as well as delayed tumor regrowth in combination treatment with standard of care chemotherapeutics. In summary, the inhibition of MNK1 activity with a highly potent and selective inhibitor BAY 1143269 may provide an innovative approach for anti-cancer therapy.
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Affiliation(s)
- Susann Santag
- Bayer AG, Drug Discovery, Pharmaceuticals, Müllerstr. 178, 13353 Berlin, Germany
| | - Franziska Siegel
- Bayer AG, Drug Discovery, Pharmaceuticals, Müllerstr. 178, 13353 Berlin, Germany
| | - Antje M Wengner
- Bayer AG, Drug Discovery, Pharmaceuticals, Müllerstr. 178, 13353 Berlin, Germany
| | - Claudia Lange
- Bayer AG, Drug Discovery, Pharmaceuticals, Müllerstr. 178, 13353 Berlin, Germany
| | - Ulf Bömer
- Bayer AG, Drug Discovery, Pharmaceuticals, Müllerstr. 178, 13353 Berlin, Germany
| | - Knut Eis
- Bayer AG, Drug Discovery, Pharmaceuticals, Müllerstr. 178, 13353 Berlin, Germany
| | - Florian Pühler
- Bayer AG, Drug Discovery, Pharmaceuticals, Müllerstr. 178, 13353 Berlin, Germany
| | - Philip Lienau
- Bayer AG, Drug Discovery, Pharmaceuticals, Müllerstr. 178, 13353 Berlin, Germany
| | - Linda Bergemann
- Bayer AG, Drug Discovery, Pharmaceuticals, Müllerstr. 178, 13353 Berlin, Germany
| | - Martin Michels
- Bayer AG, Drug Discovery, Pharmaceuticals, Müllerstr. 178, 13353 Berlin, Germany
| | - Franz von Nussbaum
- Bayer AG, Drug Discovery, Pharmaceuticals, Müllerstr. 178, 13353 Berlin, Germany
| | - Dominik Mumberg
- Bayer AG, Drug Discovery, Pharmaceuticals, Müllerstr. 178, 13353 Berlin, Germany
| | - Kirstin Petersen
- Bayer AG, Drug Discovery, Pharmaceuticals, Müllerstr. 178, 13353 Berlin, Germany.
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14
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Politz O, Siegel F, Bärfacker L, Bömer U, Hägebarth A, Scott WJ, Michels M, Ince S, Neuhaus R, Meyer K, Fernández-Montalván AE, Liu N, von Nussbaum F, Mumberg D, Ziegelbauer K. BAY 1125976, a selective allosteric AKT1/2 inhibitor, exhibits high efficacy on AKT signaling-dependent tumor growth in mouse models. Int J Cancer 2016; 140:449-459. [PMID: 27699769 DOI: 10.1002/ijc.30457] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 08/24/2016] [Indexed: 12/26/2022]
Abstract
The PI3K-AKT-mTOR signaling cascade is activated in the majority of human cancers, and its activation also plays a key role in resistance to chemo and targeted therapeutics. In particular, in both breast and prostate cancer, increased AKT pathway activity is associated with cancer progression, treatment resistance and poor disease outcome. Here, we evaluated the activity of a novel allosteric AKT1/2 inhibitor, BAY 1125976, in biochemical, cellular mechanistic, functional and in vivo efficacy studies in a variety of tumor models. In in vitro kinase activity assays, BAY 1125976 potently and selectively inhibited the activity of full-length AKT1 and AKT2 by binding into an allosteric binding pocket formed by kinase and PH domain. In accordance with this proposed allosteric binding mode, BAY 1125976 bound to inactive AKT1 and inhibited T308 phosphorylation by PDK1, while the activity of truncated AKT proteins lacking the pleckstrin homology domain was not inhibited. In vitro, BAY 1125976 inhibited cell proliferation in a broad panel of human cancer cell lines. Particularly high activity was observed in breast and prostate cancer cell lines expressing estrogen or androgen receptors. Furthermore, BAY 1125976 exhibited strong in vivo efficacy in both cell line and patient-derived xenograft models such as the KPL4 breast cancer model (PIK3CAH1074R mutant), the MCF7 and HBCx-2 breast cancer models and the AKTE17K mutant driven prostate cancer (LAPC-4) and anal cancer (AXF 984) models. These findings indicate that BAY 1125976 is a potent and highly selective allosteric AKT1/2 inhibitor that targets tumors displaying PI3K/AKT/mTOR pathway activation, providing opportunities for the clinical development of new, effective treatments.
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Affiliation(s)
- Oliver Politz
- Bayer AG, Global Drug Discovery, 13342 Berlin, Germany
| | | | - Lars Bärfacker
- Bayer AG, Global Drug Discovery, 42096 Wuppertal, Germany
| | - Ulf Bömer
- Bayer AG, Global Drug Discovery, 13342 Berlin, Germany
| | | | - William J Scott
- Bayer HealthCare Pharmaceuticals Inc, Whippany, NJ 07981-0915
| | - Martin Michels
- Bayer AG, Global Drug Discovery, 42096 Wuppertal, Germany
| | - Stuart Ince
- Bayer HealthCare Pharmaceuticals Inc, Whippany, NJ 07981-0915
| | | | - Kirstin Meyer
- Bayer AG, Global Drug Discovery, 13342 Berlin, Germany
| | | | - Ningshu Liu
- Bayer AG, Global Drug Discovery, 13342 Berlin, Germany
| | - Franz von Nussbaum
- Bayer S.A.S./Bayer CropScience, Small Molecules Research, Disease Control Chemistry, 69263 Lyon, France
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15
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Scholz A, Lücking U, Siemeister G, Lienau P, Eis K, Wengner A, Petersen K, Bömer U, Nussbaumer P, Choidas A, Rühter G, Eickhoff J, Schultz-Fademrecht C, Klebl B, Ince S, Nussbaum FV, Mumberg D, Brands M, Ziegelbauer K. Abstract 4538: BAY 1112054, a highly selective, potent and orally available inhibitor of PTEFb/CDK9, shows convincing anti-tumor activity. Cancer Res 2014. [DOI: 10.1158/1538-7445.am2014-4538] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
The family of cyclin-dependent kinase (CDK) proteins consists of multiple cell cycle regulating CDK members as well as members involved in the regulation of gene transcription like CDK9/PTEFb (positive transcription elongation factor b). Inhibition of PTEFb and its direct downstream target RNA polymerase II is thought to cause rapid depletion of short-lived mRNA transcripts of important survival proteins like c-myc and Mcl-1 and thereby to induce growth delay and apoptosis in addicted tumor cells.
In contrast to pan-CDK inhibitiors which are currently evaluated in Phase I and II clinical trials, PTEFb selective inhibitors have not been explored for clinical utility.
BAY 1112054 is a potent and highly selective PTEFb-kinase inhibitor with low nanomolar activity against PTEFb/CDK9 and an at least 50-fold selectivity against other CDKs in enzymatic assays. Furthermore, BAY 1112054 shows a favourable selectivity against non-CDK kinases in vitro. The compound exhibits broad anti-proliferative activity against a panel of tumor cell lines with sub-micromolar IC-50 values.
In line with the proposed mode of action, a concentration-dependent inhibition of the phosphorylation of the RNA polymerase II was observed in A549 tumor cells. This inhibition was accompanied by a reduction of intracellular Mcl-1 protein levels. Furthermore, BAY 1112054 increased DNA fragmentation in synchronized HeLa cells upon compound treatment for 24 hours.
BAY 1112054 showed convincing in vivo efficacy at tolerated doses in two xenograft models in mice. Once daily oral treatment led to complete tumor stasis in established MOLM-13 AML xenografts. Pharmacokinetic analysis revealed that unbound plasma levels were 8 to 12 hours above the cellular IC50 in this model. In vivo efficacy and tolerability of the once daily po schedule of BAY 1112054 was confirmed in NCI-H82 SCLC xenografts. Xenografted tumors of this model showed lower levels of RNA polymerase II phosphorylation and Mcl-1 upon treatment with BAY 1112054.
In conclusion, our data provides in vitro and in vivo proof of concept for BAY 1112054, a potent and highly selective inhibitor of PTEFb/CDK9 with first-in-class potential, and warrant further clinical evaluation of PTEFb selective inhibitors for the treatment of cancers addicted to the transcription of short-lived anti-apoptotic survival proteins.
Citation Format: Arne Scholz, Ulrich Lücking, Gerhard Siemeister, Philip Lienau, Knut Eis, Antje Wengner, Kirstin Petersen, Ulf Bömer, Peter Nussbaumer, Axel Choidas, Gerd Rühter, Jan Eickhoff, Carsten Schultz-Fademrecht, Bert Klebl, Stuart Ince, Franz von Nussbaum, Dominik Mumberg, Michael Brands, Karl Ziegelbauer. BAY 1112054, a highly selective, potent and orally available inhibitor of PTEFb/CDK9, shows convincing anti-tumor activity. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 4538. doi:10.1158/1538-7445.AM2014-4538
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Affiliation(s)
| | | | | | | | - Knut Eis
- 1Bayer Pharma AG, Berlin, Germany
| | | | | | | | | | | | - Gerd Rühter
- 2Lead Discovery Center GmbH, Dortmund, Germany
| | | | | | - Bert Klebl
- 2Lead Discovery Center GmbH, Dortmund, Germany
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16
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Zopf D, Kissel M, Mamounas M, Schuck K, Fachinger G, Bömer U, Hess-Stumpp H, Lienau P, Ince S. 152 The novel highly selective and efficacious MET inhibitor BAY853474: mode of action, basic in vitro characteristics and preclinical pharmacology. EJC Suppl 2010. [DOI: 10.1016/s1359-6349(10)71857-7] [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: 10/18/2022] Open
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17
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Bergsdorf C, Gewiese N, Stolz A, Mann R, Parczyk K, Bömer U. A Cost-Effective Solution to Reduce Dead Volume of a Standard Dispenser System by a Factor of 5. ACTA ACUST UNITED AC 2006; 11:407-12. [PMID: 16490776 DOI: 10.1177/1087057105285828] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A key trend in high-throughput screening is assay miniaturization to control reagent costs and increase throughput. For this purpose, liquid-handling devices are used that transfer nano-to low-microliter volumes into all currently used microtiter well plates. One drawback of many available dispenser and pipetting systems are high dead volumes. Therefore, the authors were looking for an easy and simple solution to modify their standard liquid-handling device, PerkinElmer’s FlexDrop™ Precision IV, allowing for a dead volume reduction to receive maximum benefit from miniaturized assay formats. Internal reservoirs were developed and constructed by Schering’s Technical Development Laboratory (TDL), which are directly connected to the dispenser banks of FlexDrop™ without tubing. Using these newly built reservoirs, the dead volume was decreased by a factor of 5 in comparison to the manufacturer’s reservoirs without compromising liquid-handling parameters such as accuracy and precision. The modified system displayed a high robustness and reliability under routine high-throughput screening conditions.
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Affiliation(s)
- Christian Bergsdorf
- Department of Assay Development and High-Throughput Screening/Enabling Technologies, Schering AG, Berlin, Germany.
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18
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Abstract
Following G protein-coupled receptors (GPCRs), protein kinases have become the second most important class of targets for drug discovery over the last 20 years. While only four kinase inhibitors have reached the market to date (Fasudil for rho-dependent kinase, Rapamycin for TOR, Gleevec for BCR-Abl, and Iressa for EGFR), many more are already in clinical development. A historical overview of kinase inhibitors was recently published by Cohen. [1] After the previous successes, protein kinases are now regarded as attractive, well-drugable targets, and the analysis of the human genome has yielded 518 protein kinases. [2] We can thus expect screening for protein kinase inhibitors to become even more important in the future. In this review we will focus on the early steps of drug discovery programs producing new lead compounds. We will guide the reader through efficient state-of-the-art assay development and high-throughput screening of large chemical libraries for protein kinase inhibitors.
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Affiliation(s)
- Oliver von Ahsen
- Assay Development & High Throughput Screening, Corporate Research, Schering AG, 13342 Berlin, Germany
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19
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Geissler A, Krimmer T, Bömer U, Guiard B, Rassow J, Pfanner N. Membrane potential-driven protein import into mitochondria. The sorting sequence of cytochrome b(2) modulates the deltapsi-dependence of translocation of the matrix-targeting sequence. Mol Biol Cell 2000; 11:3977-91. [PMID: 11071921 PMCID: PMC15051 DOI: 10.1091/mbc.11.11.3977] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
The transport of preproteins into or across the mitochondrial inner membrane requires the membrane potential Deltapsi across this membrane. Two roles of Deltapsi in the import of cleavable preproteins have been described: an electrophoretic effect on the positively charged matrix-targeting sequences and the activation of the translocase subunit Tim23. We report the unexpected finding that deletion of a segment within the sorting sequence of cytochrome b(2), which is located behind the matrix-targeting sequence, strongly influenced the Deltapsi-dependence of import. The differential Deltapsi-dependence was independent of the submitochondrial destination of the preprotein and was not attributable to the requirement for mitochondrial Hsp70 or Tim23. With a series of preprotein constructs, the net charge of the sorting sequence was altered, but the Deltapsi-dependence of import was not affected. These results suggested that the sorting sequence contributed to the import driving mechanism in a manner distinct from the two known roles of Deltapsi. Indeed, a charge-neutral amino acid exchange in the hydrophobic segment of the sorting sequence generated a preprotein with an even better import, i.e. one with lower Deltapsi-dependence than the wild-type preprotein. The sorting sequence functioned early in the import pathway since it strongly influenced the efficiency of translocation of the matrix-targeting sequence across the inner membrane. These results suggest a model whereby an electrophoretic effect of Deltapsi on the matrix-targeting sequence is complemented by an import-stimulating activity of the sorting sequence.
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Affiliation(s)
- A Geissler
- Institut für Biochemie und Molekularbiologie, Universität Freiburg, D-79104 Freiburg, Germany
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20
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Bömer U, Maarse AC, Martin F, Geissler A, Merlin A, Schönfisch B, Meijer M, Pfanner N, Rassow J. Separation of structural and dynamic functions of the mitochondrial translocase: Tim44 is crucial for the inner membrane import sites in translocation of tightly folded domains, but not of loosely folded preproteins. EMBO J 1998; 17:4226-37. [PMID: 9687491 PMCID: PMC1170756 DOI: 10.1093/emboj/17.15.4226] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The essential gene TIM44 encodes a subunit of the inner mitochondrial membrane preprotein translocase that forms a complex with the matrix heat-shock protein Hsp70. The specific role of Tim44 in protein import has not yet been defined because of the lack of means to block its function. Here we report on a Saccharomyces cerevisiae mutant allele of TIM44 that allows selective and efficient inactivation of Tim44 in organello. Surprisingly, the mutant mitochondria are still able to import preproteins. The import rate is only reduced by approximately 30% compared with wild-type as long as the preproteins do not carry stably folded domains. Moreover, the number of import sites is not reduced. However, the mutant mitochondria are strongly impaired in pulling folded domains of preproteins close to the outer membrane and in promoting their unfolding. Our results demonstrate that Tim44 is not an essential structural component of the import channel, but is crucial for import of folded domains. We suggest that the concerted action of Tim44 and mtHsp70 drives unfolding of preproteins and accelerates translocation of loosely folded preproteins. While mtHsp70 is essential for import of both tightly and loosly folded preproteins, Tim44 plays a more specialized role in translocation of tightly folded domains.
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Affiliation(s)
- U Bömer
- Institut für Biochemie und Molekularbiologie, Universität Freiburg, Germany
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21
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Bömer U, Meijer M, Guiard B, Dietmeier K, Pfanner N, Rassow J. The sorting route of cytochrome b2 branches from the general mitochondrial import pathway at the preprotein translocase of the inner membrane. J Biol Chem 1997; 272:30439-46. [PMID: 9374535 DOI: 10.1074/jbc.272.48.30439] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Cytochrome b2 is synthesized in the cytosol with a bipartite presequence. The first part of the presequence targets the protein to mitochondria and mediates translocation into the mitochondrial matrix compartment; the second part contains the sorting signal that is required for delivery of the protein to the intermembrane space. The localization of the structures that recognize the sorting signal is unclear. Here we show that upon import in vivo, the sorting signal of cytochrome b2 causes an early divergence from the general matrix import pathway and thereby prevents translocation of a folded C-terminal domain into mitochondria. By co-immunoprecipitations we find that translocation intermediates of cytochrome b2 are associated with Tim23, a component of the inner membrane protein import machinery. Cytochrome b2 constructs with an alteration in the sorting signal are mistargeted to the matrix of wild-type mitochondria. In mitochondria containing a mutant form of Tim23, however, the translocation of the altered sorting signal across the inner membrane is inhibited, and cytochrome b2 is correctly sorted to the intermembrane space. We suggest that the sorting signal of cytochrome b2 is recognized within the inner membrane in close vicinity to Tim23.
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Affiliation(s)
- U Bömer
- Institut für Biochemie und Molekularbiologie, Universität Freiburg, Hermann-Herder-Strasse 7, D-79104 Freiburg, Federal Republic of Germany.
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22
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Meyer W, Bömer U, Pratje E. Mitochondrial inner membrane bound Pet1402 protein is rapidly imported into mitochondria and affects the integrity of the cytochrome oxidase and ubiquinol-cytochrome c oxidoreductase complexes. Biol Chem 1997; 378:1373-9. [PMID: 9426197 DOI: 10.1515/bchm.1997.378.11.1373] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
In vitro synthesized Pet1402 precursor protein is very rapidly and efficiently imported into isolated mitochondria. The import depends on a membrane potential and functional mtHsp70. The mitochondrial targeting sequence of the Pet1402 precursor protein is removed by the matrix processing peptidase MPP and the mature protein is firmly embedded in the inner mitochondrial membrane. The Pet1402 protein is required for the integrity of the cytochrome oxidase and ubiquinol-cytochrome c oxidoreductase complexes.
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Affiliation(s)
- W Meyer
- Institut für Allgemeine Botanik, Universität Hamburg, Germany
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23
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Moczko M, Bömer U, Kübrich M, Zufall N, Hönlinger A, Pfanner N. The intermembrane space domain of mitochondrial Tom22 functions as a trans binding site for preproteins with N-terminal targeting sequences. Mol Cell Biol 1997; 17:6574-84. [PMID: 9343421 PMCID: PMC232511 DOI: 10.1128/mcb.17.11.6574] [Citation(s) in RCA: 115] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Mitochondrial protein import is thought to involve the sequential interaction of preproteins with binding sites on cis and trans sides of the membranes. For translocation across the outer membrane, preproteins first interact with the cytosolic domains of import receptors (cis) and then are translocated through a general import pore, in a process proposed to involve binding to a trans site on the intermembrane space (IMS) side. Controversial results have been reported for the role of the IMS domain of the essential outer membrane protein Tom22 in formation of the trans site. We show with different mutant mitochondria that a lack of the IMS domain only moderately reduces the direct import of preproteins with N-terminal targeting sequences. The dependence of import on the IMS domain of Tom22 is significantly enhanced by removing the cytosolic domains of import receptors or by performing import in two steps, i.e., accumulation of a preprotein at the outer membrane in the absence of a membrane potential (delta psi) and subsequent import after reestablishment of a delta psi. After the removal of cytosolic receptor domains, two-step import of a cleavable preprotein strictly requires the IMS domain. In contrast, preproteins with internal targeting information do not depend on the IMS domain of Tom22. We conclude that the negatively charged IMS domain of Tom22 functions as a trans binding site for preproteins with N-terminal targeting sequences, in agreement with the acid chain hypothesis of mitochondrial protein import.
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Affiliation(s)
- M Moczko
- Institut für Biochemie und Molekularbiologie, Universität Freiburg, Germany
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24
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Dekker PJ, Martin F, Maarse AC, Bömer U, Müller H, Guiard B, Meijer M, Rassow J, Pfanner N. The Tim core complex defines the number of mitochondrial translocation contact sites and can hold arrested preproteins in the absence of matrix Hsp70-Tim44. EMBO J 1997; 16:5408-19. [PMID: 9312000 PMCID: PMC1170172 DOI: 10.1093/emboj/16.17.5408] [Citation(s) in RCA: 228] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Preprotein import into mitochondria is mediated by translocases located in the outer and inner membranes (Tom and Tim) and a matrix Hsp70-Tim44 driving system. By blue native electrophoresis, we identify an approximately 90K complex with assembled Tim23 and Tim17 as the core of the inner membrane import site for presequence-containing preproteins. Preproteins spanning the two membranes link virtually all Tim core complexes with one in four Tom complexes in a stable 600K supercomplex. Neither mtHsp70 nor Tim44 are present in stoichiometric amounts in the 600K complex. Preproteins in transit stabilize the Tim core complex, preventing an exchange of subunits. Our studies define a central role for the Tim core complexes in mitochondrial protein import; they are not passive diffusion channels, but can stably interact with preproteins and determine the number of translocation contact sites. We propose the hypothesis that mtHsp70 functions in protein import not only by direct interaction with preproteins, but also by exerting a regulatory effect on the Tim channel.
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Affiliation(s)
- P J Dekker
- Institut für Biochemie und Molekularbiologie, Universität Freiburg, Hermann-Herder-Str. 7, D-79104 Freiburg, Germany
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25
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Dietmeier K, Hönlinger A, Bömer U, Dekker PJ, Eckerskorn C, Lottspeich F, Kübrich M, Pfanner N. Tom5 functionally links mitochondrial preprotein receptors to the general import pore. Nature 1997; 388:195-200. [PMID: 9217162 DOI: 10.1038/40663] [Citation(s) in RCA: 224] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Most mitochondrial proteins are synthesized as preproteins on cytosolic polysomes and are subsequently imported into the organelle. The mitochondrial outer membrane contains a multisubunit preprotein translocase (Tom) which has receptors on the cytosolic side and a general import pore (GIP) in the membrane. Tom20-Tom22 and Tom70-Tom37 function as import receptors with a preference for preproteins that have amino-terminal presequences or internal targeting information, respectively. Tom40 is an essential constituent of the GIP, whereas Tom6 and Tom7 modulate the assembly and dissociation of the Tom machinery. Here we report the identification of Tom5, a small subunit that has a crucial role importing preproteins destined for all four mitochondrial subcompartments. Tom5 has a single membrane anchor and a cytosolic segment with a negative net charge, and accepts preproteins from the receptors and mediates their insertion into the GIP. We conclude that Tom5 represents a functional link between surface receptors and GIP, and is part of an 'acid chain' that guides the stepwise transport of positively charged mitochondrial targeting sequences.
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Affiliation(s)
- K Dietmeier
- Institut für Biochemie und Molekularbiologie, Universität Freiburg, Germany
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26
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Bömer U, Meijer M, Maarse AC, Hönlinger A, Dekker PJ, Pfanner N, Rassow J. Multiple interactions of components mediating preprotein translocation across the inner mitochondrial membrane. EMBO J 1997; 16:2205-16. [PMID: 9171336 PMCID: PMC1169823 DOI: 10.1093/emboj/16.9.2205] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The protein transport machinery of the inner mitochondrial membrane contains three essential Tim proteins. Tim17 and Tim23 are thought to build a preprotein translocation channel, while Tim44 transiently interacts with the matrix heat shock protein Hsp70 to form an ATP-driven import motor. For this report we characterized the biogenesis and interactions of Tim proteins. (i) Import of the precursor of Tim44 into the inner membrane requires mtHsp70, whereas import and inner membrane integration of the precursors of Tim17 and Tim23 are independent of functional mtHsp70. (ii) Tim17 efficiently associates with Tim23 and mtHsp70, but only weakly with Tim44. (iii) Depletion of Tim44 does not affect the co-precipitation of Tim17 with antibodies directed against mtHsp70. (iv) Tim23 associates with both Tim44 and Tim17, suggesting the presence of two Tim23 pools in the inner membrane, a Tim44-Tim23-containing sub-complex and a Tim23-Tim17-containing sub-complex. (v) The association of mtHsp70 with the Tim23-Tim17 sub-complex is ATP sensitive and can be distinguished from the mtHsp70-Tim44 interaction by the differential influence of an amino acid substitution in mtHsp70. (vi) Genetic evidence, suppression of the protein import defect of a tim17 yeast mutant by overexpression of mtHsp70 and synthetic lethality of conditional mutants in the genes of Tim17 and mtHsp70, supports a functional interaction of mtHsp70 with Tim17. We conclude that the protein transport machinery of the mitochondrial inner membrane consists of dynamically interacting sub-complexes, each of which transiently binds mtHsp70.
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Affiliation(s)
- U Bömer
- Institut für Biochemie und Molekularbiologie, Universität Freiburg, Germany
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27
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Bömer U, Rassow J, Zufall N, Pfanner N, Meijer M, Maarse AC. The preprotein translocase of the inner mitochondrial membrane: evolutionary conservation of targeting and assembly of Tim17. J Mol Biol 1996; 262:389-95. [PMID: 8893850 DOI: 10.1006/jmbi.1996.0522] [Citation(s) in RCA: 44] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The preprotein translocase of the inner mitochondrial membrane has only been described in Saccharomyces cerevisiae to date. We report that the essential subunit Tim17 is highly conserved in evolution. The targeting and assembly of yeast Tim17 as well as that of human and Drosophila melanogaster Tim17 were characterized with isolated yeast mitochondria. Targeting signals in the mature protein direct the Tim17 precursors to the receptor Tom70 on the mitochondrial surface. In a membrane potential-dependent step the precursors insert into the inner membrane, adopt a characteristic topology and assemble with Tim23. The mechanisms of targeting and assembly were indistinguishable between the Tim17s from distinct organisms, indicating a high evolutionary conservation.
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Affiliation(s)
- U Bömer
- Institut für Biochemie und Molekularbiologie, Universität, Freiburg, Germany
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28
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Hönlinger A, Bömer U, Alconada A, Eckerskorn C, Lottspeich F, Dietmeier K, Pfanner N. Tom7 modulates the dynamics of the mitochondrial outer membrane translocase and plays a pathway-related role in protein import. EMBO J 1996. [DOI: 10.1002/j.1460-2075.1996.tb00566.x] [Citation(s) in RCA: 135] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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29
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Hönlinger A, Bömer U, Alconada A, Eckerskorn C, Lottspeich F, Dietmeier K, Pfanner N. Tom7 modulates the dynamics of the mitochondrial outer membrane translocase and plays a pathway-related role in protein import. EMBO J 1996; 15:2125-37. [PMID: 8641278 PMCID: PMC450135] [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: 02/01/2023] Open
Abstract
The preprotein translocase of the outer mitochondrial membrane is a multi-subunit complex with receptors and a general import pore. We report the molecular identification of Tom7, a small subunit of the translocase that behaves as an integral membrane protein. The deletion of TOM7 inhibited the mitochondrial import of the outer membrane protein porin, whereas the import of preproteins destined for the mitochondrial interior was impaired only slightly. However, protein import into the mitochondrial interior was strongly inhibited when it occurred in two steps: preprotein accumulation at the outer membrane in the absence of a membrane potential and subsequent further import after the re-establishment of a membrane potential. The delay of protein import into tom7delta mitochondria seemed to occur after the binding of preproteins to the outer membrane receptor sites. A lack of Tom7 stabilized the interaction between the receptors Tom20 and Tom22 and the import pore component Tom40. This indicated that Tom7 exerts a destabilizing effect on part of the outer membrane translocase, whereas Tom6 stabilizes the interaction between the receptors and the import pore. Synthetic growth defects of the double mutants tom7delta tom20delta and tom7delta tom6delta provided genetic evidence for the functional relationship of Tom7 with Tom20 and Tom6. These results suggest that (i) Tom7 plays a role in sorting and accumulation of the preproteins at the outer membrane, and (ii) Tom7 and Tom6 perform complementary functions in modulating the dynamics of the outer membrane translocase.
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Affiliation(s)
- A Hönlinger
- Institut für Biochemie und Molekularbiologie, Universität Freiburg, Martinsried, Germany
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30
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Abstract
The mitochondrial outer membrane contains a protein complex with at least eight subunits responsible for recognition and translocation of preproteins synthesized in the cytosol. Two subunits, the receptors Tom20 and Tom70, contain tetratrico peptide repeats that are thought to be involved in protein-protein interactions. We have identified Saccharomyces cerevisiae Tom72, a new Tom protein expressed at a low level. Tom72 is homologous to Tom 70, including seven tetratrico peptide repeats. Tom72 is targeted to the mitochondrial outer membrane, forms a large domain exposed to the cytosol and loosely associates with the translocase complex of the outer membrane. These results suggest that Tom72 represents a ninth, weakly expressed component of the preprotein translocase of the mitochondrial outer membrane.
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Affiliation(s)
- U Bömer
- Institut für Biochemie and Molekularbiologie, Universität Freiburg, Germany
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31
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Gärtner F, Bömer U, Guiard B, Pfanner N. The sorting signal of cytochrome b2 promotes early divergence from the general mitochondrial import pathway and restricts the unfoldase activity of matrix Hsp70. EMBO J 1995; 14:6043-57. [PMID: 8846797 PMCID: PMC394725 DOI: 10.1002/j.1460-2075.1995.tb00293.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Cytochrome b2 is imported into mitochondria and sorted to the intermembrane space by a bipartite N-terminal presequence, which is a matrix targeting sequenced followed by an intermembrane space sorting signal. The N-terminus of the mature protein forms a folded heme binding domain that depends on the unfoldase function of matrix (mt) Hsp70 for import. We report that the distance between the presequence and the heme binding domain is critical for the ability of mt-Hsp70 to promote import of the domain. Hybrid proteins with 40 or more amino acids between the presequence and the heme binding domain are arrested in the import machinery. The translocation arrest can be overcome by unfolding of the preprotein or by inactivation of the intermembrane space sorting signal. Moreover, the sorting signal prevents backsliding of the precursor polypeptide in the import site in the initial import step, when the signal has not made contact with the matrix. The results indicate that the sorting signal interacts with component(s) of the inner membrane/intermembrane space during the initial import step and promotes an early divergence of b2 preproteins from the general matrix import pathway, precluding an unfolding role for mt-Hsp70 in the translocation of most of the mature portions of a preprotein. We propose a sorting model of cytochrome b2 which explains the apparently divergent previous results by a unifying hypothesis.
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Affiliation(s)
- F Gärtner
- Biochemisches Institut, Universität Freiburg, Germany
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32
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Schuppe HC, Haas-Raida D, Kulig J, Bömer U, Gleichmann E, Kind P. T-cell-dependent popliteal lymph node reactions to platinum compounds in mice. Int Arch Allergy Immunol 1992; 97:308-14. [PMID: 1597351 DOI: 10.1159/000236138] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The requirements for sensitization to complex salts of platinum were investigated in a mouse model by means of the popliteal lymph node (PLN) assay. A single subcutaneous injection of dissolved hexachloroplatinates without adjuvant induced a vigorous primary immune reaction in the draining PLN. Dose-dependent lymph node activation was determined by an increase in both PLN weight and cellularity. In C57BL/6 mice, peak reactions were obtained around day 6 after administration of 90-180 nmol Na2[PtCl6] or (NH4)2[PtCl6] per animal. Mice primed to [PtCl6]2- mounted an enhanced response upon local restimulation with suboptimal doses of the same but not unrelated compounds, indicating a specific secondary response. T cells were required to elicit PLN reactions to [PtCl6]2-, because athymic nude mice completely failed to respond, in contrast to their +/nu littermates. Differences between various inbred strains of mice revealed that Pt-induced PLN responses are genetically controlled. Moreover, the immunogenicity of Pt salts in mice is not confined to hexachloroplatinates, but other compounds, such as the antineoplastic agent cis-dichlorodiamine platinum, are able to induce comparable PLN reactions.
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Affiliation(s)
- H C Schuppe
- Department of Dermatology, Heinrich Heine University, Düsseldorf, FRG
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