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Lee S, Kim J, Jo J, Chang JW, Sim J, Yun H. Recent advances in development of hetero-bivalent kinase inhibitors. Eur J Med Chem 2021; 216:113318. [PMID: 33730624 DOI: 10.1016/j.ejmech.2021.113318] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 02/16/2021] [Accepted: 02/16/2021] [Indexed: 12/13/2022]
Abstract
Identifying a pharmacological agent that targets only one of more than 500 kinases present in humans is an important challenge. One potential solution to this problem is the development of bivalent kinase inhibitors, which consist of two connected fragments, each bind to a dissimilar binding site of the bisubstrate enzyme. The main advantage of bivalent (type V) kinase inhibitors is generating more interactions with target enzymes that can enhance the molecules' selectivity and affinity compared to single-site inhibitors. Earlier type V inhibitors were not suitable for the cellular environment and were mostly used in in vitro studies. However, recently developed bivalent compounds have high kinase affinity, high biological and chemical stability in vivo. This review summarized the hetero-bivalent kinase inhibitors described in the literature from 2014 to the present. We attempted to classify the molecules by serine/threonine and tyrosine kinase inhibitors, and then each target kinase and its hetero-bivalent inhibitor was assessed in depth. In addition, we discussed the analysis of advantages, limitations, and perspectives of bivalent kinase inhibitors compared with the monovalent kinase inhibitors.
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Affiliation(s)
- Seungbeom Lee
- College of Pharmacy, CHA University, Pocheon-si, Gyeonggi-do, 11160, Republic of Korea
| | - Jisu Kim
- College of Pharmacy, Pusan National University, Busan, 46241, Republic of Korea
| | - Jeyun Jo
- College of Pharmacy, Pusan National University, Busan, 46241, Republic of Korea
| | - Jae Won Chang
- Department of Pharmacology & Chemical Biology, School of Medicine, Emory University, Atlanta, GA, USA; Department of Hematology & Medical Oncology, School of Medicine, Emory University, Atlanta, GA, USA; Winship Cancer Institute, Emory University, Atlanta, GA, USA
| | - Jaehoon Sim
- College of Pharmacy, Chungnam National University, Daejeon, 34134, Republic of Korea.
| | - Hwayoung Yun
- College of Pharmacy, Pusan National University, Busan, 46241, Republic of Korea.
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2
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Casement R, Bond A, Craigon C, Ciulli A. Mechanistic and Structural Features of PROTAC Ternary Complexes. Methods Mol Biol 2021; 2365:79-113. [PMID: 34432240 DOI: 10.1007/978-1-0716-1665-9_5] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The rapid and ever-growing advancements from within the field of proteolysis-targeting chimeras (PROTAC)-induced protein degradation have driven considerable development to gain a deeper understanding of their mode of action. The ternary complex formed by PROTACs with their target protein and E3 ubiquitin ligase is the key species in their substoichiometric catalytic mechanism. Here, we describe the theoretical framework that underpins ternary complexes, including a current understanding of the three-component binding model, cooperativity, hook effect and structural considerations. We discuss in detail the biophysical methods used to interrogate ternary complex formation in vitro, including X-ray crystallography, AlphaLISA, FRET, FP, ITC and SPR. Finally, we provide detailed ITC methods and discuss approaches to assess binary and ternary target engagement, target ubiquitination and degradation that can be used to obtain a more holistic understanding of the mode of action within a cellular environment.
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Affiliation(s)
- Ryan Casement
- Division of Biological Chemistry and Drug Discovery, School of Life Sciences, University of Dundee, Dundee, Scotland, UK
| | - Adam Bond
- Division of Biological Chemistry and Drug Discovery, School of Life Sciences, University of Dundee, Dundee, Scotland, UK
| | - Conner Craigon
- Division of Biological Chemistry and Drug Discovery, School of Life Sciences, University of Dundee, Dundee, Scotland, UK
| | - Alessio Ciulli
- Division of Biological Chemistry and Drug Discovery, School of Life Sciences, University of Dundee, Dundee, Scotland, UK.
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3
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Avoiding or Co-Opting ATP Inhibition: Overview of Type III, IV, V, and VI Kinase Inhibitors. NEXT GENERATION KINASE INHIBITORS 2020. [PMCID: PMC7359047 DOI: 10.1007/978-3-030-48283-1_3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
As described in the previous chapter, most kinase inhibitors that have been developed for use in the clinic act by blocking ATP binding; however, there is growing interest in identifying compounds that target kinase activities and functions without interfering with the conserved features of the ATP-binding site. This chapter will highlight alternative approaches that exploit unique kinase structural features that are being targeted to identify more selective and potent inhibitors. The figure below, adapted from (Sammons et al., Molecular Carcinogenesis 58:1551–1570, 2019), provides a graphical description of the various approaches to manipulate kinase activity. In addition to the type I and II inhibitors, type III kinase inhibitors have been identified to target sites adjacent to the ATP-binding site in the catalytic domain. New information on kinase structure and substrate-binding sites has enabled the identification of type IV kinase inhibitor compounds that target regions outside the catalytic domain. The combination of targeting unique allosteric sites outside the catalytic domain with ATP-targeted compounds has yielded a number of novel bivalent type V kinase inhibitors. Finally, emerging interest in the development of irreversible compounds that form selective covalent interactions with key amino acids involved in kinase functions comprise the class of type VI kinase inhibitors.
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4
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Kedika SR, Udugamasooriya DG. Converting a weaker ATP-binding site inhibitor into a potent hetero-bivalent ligand by tethering to a unique peptide sequence derived from the same kinase. Org Biomol Chem 2019; 16:6443-6449. [PMID: 30140808 DOI: 10.1039/c8ob01406j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Attaching an additional binding site directed moiety or a ligand to an ATP-binding site inhibitor has been used as a strategy to increase kinase binding affinity and specificity. The moieties typically used here as the second binding partner are varied from simple organic groups to ligands such as peptides derived from substrate binding site sequences. So far these hetero-bivalent ligands were developed targeting additional binding sites closer to the ATP-binding pocket. Here we report a unique expansion of this hetero-bivalent idea by: (I) targeting a new binding site much farther away from ATP-binding site, (II) using a peptide uniquely derived from a portion of the same kinase sequence that has been reported to turn and bind to the above distance binding pocket (used as the second binding ligand), and (III) optimizing a much longer and flexible linker (to connect ATP-binding site inhibitor and above mentioned second peptide sequence) with multistep, yet complete on-bead synthesis approach. We converted a very weak EphA3-kinase ATP-binding site inhibitor-PP2 into a potent hetero-bivalent ligand by tethering to a unique 5-mer peptide sequence that derived from the linker region of EphA3 that connects kinase and sterile alpha motif (SAM) domains. Our design highlight the use of distance binding pockets to ATP-binding site as the second targeted site, while introducing the idea of extracting natural peptide sequences that already exist within the same kinase sequence, by a careful screening of available crystal structures.
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Affiliation(s)
- Samanth Reddy Kedika
- Department of Pharmacological & Pharmaceutical Sciences, University of Houston, 4849 Calhoun Rd, Health Building 2, Room 7033, Houston, TX 77204-5037, USA.
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5
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Tanaka M, Roberts JM, Seo HS, Souza A, Paulk J, Scott TG, DeAngelo SL, Dhe-Paganon S, Bradner JE. Design and characterization of bivalent BET inhibitors. Nat Chem Biol 2016; 12:1089-1096. [PMID: 27775715 PMCID: PMC5117811 DOI: 10.1038/nchembio.2209] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Accepted: 08/02/2016] [Indexed: 12/24/2022]
Abstract
Cellular signaling is often propagated by multivalent interactions. Multivalency creates avidity, allowing stable biophysical recognition. Multivalency is an attractive strategy for achieving potent binding to protein targets, as the affinity of bivalent ligands is often greater than the sum of monovalent affinities. The BET family of transcriptional coactivators features tandem bromodomains, through which BET proteins naturally bind acetylated histones and transcription factors. All reported BRD4 antagonists bind in a monovalent fashion. Here, we report the first bivalent BET bromodomain inhibitor, MT1 that has unprecedented potency. Biophysical and biochemical studies suggest MT1 is an intramolecular bivalent BRD4 binder that is over 100-fold more potent in cellular assays compared to the corresponding monovalent antagonist, JQ1. MT1 significantly delayed leukemia progression in mice (Mus musculus) compared to JQ1. These data qualify a powerful chemical probe for BET bromodomains and extensible rationale for further development of multidomain epigenetic reader protein inhibitors.
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Affiliation(s)
- Minoru Tanaka
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, USA.,Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Justin M Roberts
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, USA
| | - Hyuk-Soo Seo
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, USA
| | - Amanda Souza
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, USA
| | - Joshiawa Paulk
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, USA
| | - Thomas G Scott
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, USA
| | - Stephen L DeAngelo
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, USA.,Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, USA
| | - Sirano Dhe-Paganon
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, USA
| | - James E Bradner
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, USA.,Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
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6
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Abstract
We have developed a general methodology to produce bivalent kinase inhibitors for c-Src that interact with the SH2 and ATP binding pockets. Our approach led to a highly selective bivalent inhibitor of c-Src. We demonstrate impressive selectivity for c-Src over homologous kinases. Exploration of the unexpected high level of selectivity yielded insight into the inherent flexibility of homologous kinases. Finally, we demonstrate that our methodology is modular and both the ATP-competitive fragment and conjugation chemistry can be swapped.
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Affiliation(s)
- Taylor K. Johnson
- Department of Medicinal Chemistry, University of Michigan, Ann Arbor, MI 48109
| | - Matthew B. Soellner
- Department of Medicinal Chemistry, University of Michigan, Ann Arbor, MI 48109
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109
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7
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Gower CM, Thomas JR, Harrington E, Murphy J, Chang MEK, Cornella-Taracido I, Jain RK, Schirle M, Maly DJ. Conversion of a Single Polypharmacological Agent into Selective Bivalent Inhibitors of Intracellular Kinase Activity. ACS Chem Biol 2016; 11:121-31. [PMID: 26505072 DOI: 10.1021/acschembio.5b00847] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Loss-of-function studies are valuable for elucidating kinase function and the validation of new drug targets. While genetic techniques, such as RNAi and genetic knockouts, are highly specific and easy to implement, in many cases post-translational perturbation of kinase activity, specifically pharmacological inhibition, is preferable. However, due to the high degree of structural similarity between kinase active sites and the large size of the kinome, identification of pharmacological agents that are sufficiently selective to probe the function of a specific kinase of interest is challenging, and there is currently no systematic method for accomplishing this goal. Here, we present a modular chemical genetic strategy that uses antibody mimetics as highly selective targeting components of bivalent kinase inhibitors. We demonstrate that it is possible to confer high kinase selectivity to a promiscuous ATP-competitive inhibitor by tethering it to an antibody mimetic fused to the self-labeling protein SNAPtag. With this approach, a potent bivalent inhibitor of the tyrosine kinase Abl was generated. Profiling in complex cell lysates, with competition-based quantitative chemical proteomics, revealed that this bivalent inhibitor possesses greatly enhanced selectivity for its target, BCR-Abl, in K562 cells. Importantly, we show that both components of the bivalent inhibitor can be assembled in K562 cells to block the ability of BCR-Abl to phosphorylate a direct cellular substrate. Finally, we demonstrate the generality of using antibody mimetics as components of bivalent inhibitors by generating a reagent that is selective for the activated state of the serine/threonine kinase ERK2.
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Affiliation(s)
| | - Jason R. Thomas
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - Edmund Harrington
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - Jason Murphy
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts 02139, United States
| | | | - Ivan Cornella-Taracido
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - Rishi K. Jain
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - Markus Schirle
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts 02139, United States
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8
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Böcker S, Laaf D, Elling L. Galectin Binding to Neo-Glycoproteins: LacDiNAc Conjugated BSA as Ligand for Human Galectin-3. Biomolecules 2015. [PMID: 26213980 PMCID: PMC4598770 DOI: 10.3390/biom5031671] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Carbohydrate-lectin interactions are relatively weak. As they play an important role in biological recognition processes, multivalent glycan ligands are designed to enhance binding affinity and inhibitory potency. We here report on novel neo-glycoproteins based on bovine serum albumin as scaffold for multivalent presentation of ligands for galectins. We prepared two kinds of tetrasaccharides (N-acetyllactosamine and N,N-diacetyllactosamine terminated) by multi-step chemo-enzymatic synthesis utilizing recombinant glycosyltransferases. Subsequent conjugation of these glycans to lysine groups of bovine serum albumin via squaric acid diethyl ester yielded a set of 22 different neo-glycoproteins with tuned ligand density. The neo-glycoproteins were analyzed by biochemical and chromatographic methods proving various modification degrees. The neo-glycoproteins were used for binding and inhibition studies with human galectin-3 showing high affinity. Binding strength and inhibition potency are closely related to modification density and show binding enhancement by multivalent ligand presentation. At galectin-3 concentrations comparable to serum levels of cancer patients, we detect the highest avidities. Selectivity of N,N-diacetyllactosamine terminated structures towards galectin-3 in comparison to galectin-1 is demonstrated. Moreover, we also see strong inhibitory potency of our scaffolds towards galectin-3 binding. These novel neo-glycoproteins may therefore serve as selective and strong galectin-3 ligands in cancer related biomedical research.
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Affiliation(s)
- Sophia Böcker
- Laboratory for Biomaterials, Institute for Biotechnology and Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University, Pauwelsstr. 20, 52074 Aachen, Germany.
| | - Dominic Laaf
- Laboratory for Biomaterials, Institute for Biotechnology and Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University, Pauwelsstr. 20, 52074 Aachen, Germany.
| | - Lothar Elling
- Laboratory for Biomaterials, Institute for Biotechnology and Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University, Pauwelsstr. 20, 52074 Aachen, Germany.
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9
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Gower CM, Chang MEK, Maly DJ. Bivalent inhibitors of protein kinases. Crit Rev Biochem Mol Biol 2014; 49:102-15. [PMID: 24564382 DOI: 10.3109/10409238.2013.875513] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Protein kinases are key players in a large number of cellular signaling pathways. Dysregulated kinase activity has been implicated in a number of diseases, and members of this enzyme family are of therapeutic interest. However, due to the fact that most inhibitors interact with the highly conserved ATP-binding sites of kinases, it is a significant challenge to develop pharmacological agents that target only one of the greater than 500 kinases present in humans. A potential solution to this problem is the development of bisubstrate and bivalent kinase inhibitors, in which an active site-directed moiety is tethered to another ligand that targets a location outside of the ATP-binding cleft. Because kinase signaling specificity is modulated by regions outside of the ATP-binding site, strategies that exploit these interactions have the potential to provide reagents with high target selectivity. This review highlights examples of kinase interaction sites that can potentially be exploited by bisubstrate and bivalent inhibitors. Furthermore, an overview of efforts to target these interactions with bisubstrate and bivalent inhibitors is provided. Finally, several examples of the successful application of these reagents in a cellular setting are described.
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Affiliation(s)
- Carrie M Gower
- Department of Chemistry, University of Washington , Seattle, WA , USA
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10
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Tinkering outside the kinase ATP box: allosteric (type IV) and bivalent (type V) inhibitors of protein kinases. Future Med Chem 2011; 3:29-43. [PMID: 21428824 DOI: 10.4155/fmc.10.272] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Many members of the protein kinase family have emerged as key targets for pharmacological intervention, most notably in cancer. However, the high sequence and structural homology shared by the more than 500 human protein kinases renders it exceedingly difficult to develop selective inhibitors. Most, if not all, existing inhibitors target multiple protein kinases. Current paradigm suggests that an inhibitor that targets multiple kinases and displays polypharmacology is not only acceptable but also often desirable as a therapeutic agent. However, as we move toward personalized medicine the currently acceptable promiscuity is likely to pose significant hurdles in terms of their therapeutic index, especially for diseases that necessitate long-term drug administration. Moreover, selective inhibitors are the only pharmacologically relevant route toward reagents for the dissection of complex signal transduction pathways. This article provides an overview of recent developments in the design of kinase inhibitors that display increasing selectivity by targeting regions outside the highly conserved ATP-binding pocket. These new approaches may pave the way to potentially new avenues for drug discovery while providing valuable tools for studying signal transduction.
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11
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Multivalent Antimicrobial Peptides as Therapeutics: Design Principles and Structural Diversities. Int J Pept Res Ther 2010; 16:199-213. [PMID: 20835389 PMCID: PMC2931633 DOI: 10.1007/s10989-010-9230-z] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/17/2010] [Indexed: 01/15/2023]
Abstract
This review highlights the design principles, progress and advantages attributed to the structural diversity associated with both natural and synthetic multivalent antimicrobial peptides (AMPs). Natural homo- or hetero-dimers of AMPs linked by intermolecular disulfide bonds existed in the animal kingdom, but the multivalency strategy has been adopted to create synthetic branched or polymeric AMPs that do not exist in nature. The multivalent strategy for the design of multivalent AMPs provides advantages to overcome the challenges faced in clinical applications of AMPs, such as: stability, efficiency, toxicity, maintenance of activity in high salt concentrations and under physiological conditions, and importantly overcoming bacterial resistance which is currently a leading health problem in the world. The multivalency strategy is valuable for moving multivalent AMPs toward clinical applications.
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12
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Abstract
Cell-based assays represent approximately half of all high-throughput screens currently performed. Here, we review in brief the history and status of high-throughput screening (HTS), and summarize some of the challenges and benefits associated with the use of cell-based assays in HTS. Approaches for successful experimental design and execution of cell-based screens are introduced, including strategies for assay development, implementation of primary and secondary screens, and target identification. In doing so, we hope to provide a comprehensive review of the cell-based HTS process and an introduction to the methodologies and techniques used.
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Affiliation(s)
- W Frank An
- Chemical Biology Platform, The Broad Institute, 7 Cambridge Center, Cambridge, MA 02142, USA.
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13
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Tiwari R, Parang K. Protein conjugates of SH3-domain ligands and ATP-competitive inhibitors as bivalent inhibitors of protein kinases. Chembiochem 2010; 10:2445-8. [PMID: 19731277 DOI: 10.1002/cbic.200900462] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Rakesh Tiwari
- Department of Biomedical and Pharmaceutical Sciences, University of Rhode Island, 41 Lower College Road, Kingston, RI 02881, USA
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14
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Ting SRS, Chen G, Stenzel MH. Synthesis of glycopolymers and their multivalent recognitions with lectins. Polym Chem 2010. [DOI: 10.1039/c0py00141d] [Citation(s) in RCA: 321] [Impact Index Per Article: 22.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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15
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Lim HS, Reddy MM, Xiao X, Wilson J, Wilson R, Connell S, Kodadek T. Rapid identification of improved protein ligands using peptoid microarrays. Bioorg Med Chem Lett 2009; 19:3866-9. [PMID: 19380225 PMCID: PMC4452005 DOI: 10.1016/j.bmcl.2009.03.153] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2009] [Revised: 03/26/2009] [Accepted: 03/30/2009] [Indexed: 10/20/2022]
Abstract
A rapid array-based protocol is presented by which a modest affinity protein-binding small molecule can be appended to a library of peptoids via click chemistry. The array can then be screened for improved ligands that exhibit a higher affinity for the protein target.
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Affiliation(s)
- Hyun-Suk Lim
- Departments of Internal Medicine and Molecular Biology, Division of Translational Research, University of Texas Southwestern Medical Center, Dallas, TX 75390-9185
| | - M. Muralidhar Reddy
- Departments of Internal Medicine and Molecular Biology, Division of Translational Research, University of Texas Southwestern Medical Center, Dallas, TX 75390-9185
| | - Xiangshu Xiao
- Departments of Internal Medicine and Molecular Biology, Division of Translational Research, University of Texas Southwestern Medical Center, Dallas, TX 75390-9185
| | - Johnnie Wilson
- Departments of Internal Medicine and Molecular Biology, Division of Translational Research, University of Texas Southwestern Medical Center, Dallas, TX 75390-9185
| | - Rosemary Wilson
- Departments of Internal Medicine and Molecular Biology, Division of Translational Research, University of Texas Southwestern Medical Center, Dallas, TX 75390-9185
| | - Steven Connell
- Departments of Internal Medicine and Molecular Biology, Division of Translational Research, University of Texas Southwestern Medical Center, Dallas, TX 75390-9185
| | - Thomas Kodadek
- Departments of Internal Medicine and Molecular Biology, Division of Translational Research, University of Texas Southwestern Medical Center, Dallas, TX 75390-9185
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16
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Desamero RZB, Kang J, Dol C, Chinwong J, Walters K, Sivarajah T, Profit AA. Spectroscopic characterization of the SH2- and active site-directed peptide sequences of a bivalent Src kinase inhibitor. APPLIED SPECTROSCOPY 2009; 63:767-774. [PMID: 19589214 DOI: 10.1366/000370209788701125] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The spectral properties of the SH2 and active site-directed sequences of the bivalent Src kinase inhibitor Ac-EELL(F5)Phe-(GABA)3-pYEEIE-amide (1) have been determined. Ac-pYEEIE-amide (2) and AcEELL(F5)Phe-amide (3), as well as the amino acids phosphotyrosine (pTyr) and pentafluorophenylalanine (F5)Phe, have been characterized by electronic absorption, fluorescence, and vibrational spectroscopy. Specific and unique marker bands that originate from the phosphate group of pTyr and the fluorinated aromatic ring of (F5)Phe have been identified, with the latter showing some solvent dependence. Peptide 2 was found to have excitation and emission wavelengths emanating from pTyr at 268 and 295 nm, respectively, whereas peptide 3 displayed excitation and emission peaks attributable to (F5)Phe at 274 and 315 nm, respectively. Fourier transform infrared (FT-IR) analysis of the amino acid pTyr identified distinct marker bands at approximately 930, 1090, and 1330 cm(-1) that could be attributed to the phosphate group. These markers were also observed in the IR spectrum of peptide 2. Likewise, peptide 3 displayed a characteristic C-F stretching mode at 961 cm(-1) due to the presence of (F5)Phe, including two C-F reporting ring modes at 1509 and 1527 cm(-1). Identifying and monitoring spectroscopic changes in these marker bands may afford a means to observe the molecular interactions that occur when peptides 1-3 bind to the Src kinase.
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Affiliation(s)
- Ruel Z B Desamero
- The Graduate Center, The City University of New York, 94-20 Guy R. Brewer Boulevard, Jamaica, New York 11451, USA.
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17
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Abstract
Cell-based assays represent approximately half of all high-throughput screens (HTS) currently performed. Here we review the history and status of HTS, and summarize some of the challenges and benefits associated with the use of cell-based assays in HTS, drawing upon themes that will reemerge in subsequent chapters in this book. Approaches for successful experimental design and execution of cell-based HTS are introduced, including strategies for assay development, implementation of primary and secondary screens, and target identification. In doing so, we hope to provide a comprehensive review of the cell-based HTS process and an introduction to the methodologies and techniques described in this book.
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Affiliation(s)
- W Frank An
- Chemical Biology Platform, Broad Institute of Harvard and MIT, Cambridge, MA, USA
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18
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Pieters RJ. Maximising multivalency effects in protein–carbohydrate interactions. Org Biomol Chem 2009; 7:2013-25. [DOI: 10.1039/b901828j] [Citation(s) in RCA: 288] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Machida S, Usuba K, Blaskovich MA, Yano A, Harada K, Sebti SM, Kato N, Ohkanda J. Module assembly for protein-surface recognition: geranylgeranyltransferase I bivalent inhibitors for simultaneous targeting of interior and exterior protein surfaces. Chemistry 2008; 14:1392-401. [PMID: 18200641 DOI: 10.1002/chem.200701634] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Synthetic chemical probes designed to simultaneously targeting multiple sites of protein surfaces are of interest owing to their potential application as site specific modulators of protein-protein interactions. A new approach toward bivalent inhibitors of mammalian type I geranylgeranyltransferase (GGTase I) based on module assembly for simultaneous recognition of both interior and exterior protein surfaces is reported. The inhibitors synthesized in this study consist of two modules linked by an alkyl spacer; one is the tetrapeptide CVIL module for binding to the interior protein surface (active pocket) and the other is a 3,4,5-alkoxy substituted benzoyl motif that contains three aminoalkyl groups designed to bind to the negatively charged protein exterior surface near the active site. The compounds were screened by two distinct enzyme inhibition assays based on fluorescence spectroscopy and incorporation of a [(3)H]-labeled prenyl group onto a protein substrate. The bivalent inhibitors block GGTase I enzymatic activity with K(i) values in the submicromolar range and are approximately one order of magnitude and more than 150 times more effective than the tetrapeptide CVIL and the methyl benzoate derivatives, respectively. The bivalent compounds 6 and 8 were shown to be competitive inhibitors, suggesting that the CVIL module anchors the whole molecule to the GGTase I active site and delivers the other module to the targeting protein surface. Thus, our module-assembly approach resulted in simultaneous multiple-site recognition, and as a consequence, synergetic inhibition of GGTase I activity, thereby providing a new approach in designing protein-surface-directed inhibitors for targeting protein-protein interactions.
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Affiliation(s)
- Shinnosuke Machida
- The Institute of Scientific and Industrial Research (ISIR), Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, Japan
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20
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Angell Y, Chen D, Brahimi F, Saragovi HU, Burgess K. A combinatorial method for solution-phase synthesis of labeled bivalent beta-turn mimics. J Am Chem Soc 2007; 130:556-65. [PMID: 18088119 DOI: 10.1021/ja074717z] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Piperidine-functionalized, 1,4-disubstituted-1,2,3-triazoles of generic structure 1 were conceived as "minimalist" mimics of peptidic beta-turn structures. Key features of these molecules include (i) the possibility of incorporating amino acid side chains corresponding to many of the protein amino acids; (ii) a close correspondence of separations of these side chains to i + 1 to i + 2 residues in turns; (iii) facile adjustment of the side-chain vectors on docking while only influencing two critical degrees of freedom; and (iv) some electrostatic polarity. Fifteen monomers of this type were made via copper-mediated cycloaddition reactions. Solution-phase methodologies were devised to assemble these monomers into bivalent compounds in high purity states (typically >85%) so that they could be used in first-pass biological assays without further purification. The skeleton for forming these bivalent compounds is triazine-based. There is a third site which allowed for introduction of a fluorescent label (library of compounds 2) or an alkyne-functionalized triethylene glycol chain (library of compounds 3) included to promote water-solubility and to allow incorporation of probes via copper-mediated cycloaddition reactions. In the event, two 135-membered libraries were prepared, one consisting of compounds 2 and the other of 3. No protecting groups or coupling agents were required; these attributes of the method were important to allow most of the products to be obtained in over 85% purities. The fluorescein-tagged library of compounds 2 was screened in a fluorescence-activated cell sorting (FACS) assay using cells transfected to overexpress one of the following neurotrophin receptors: TrkA, TrkC, and p75. Preliminary findings indicate four compounds 2gm, 2gn, 2gi, and 2gj bound the TrkA receptor selectively; all of these contain a threonine-lysine turn mimic. Thus, a pharmacological probe for the TrkA receptor has been developed.
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Affiliation(s)
- Yu Angell
- Department of Chemistry, Texas A & M University, Box 30012, College Station, Texas 77841, USA
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21
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Ahn YH, Chang YT. Tagged small molecule library approach for facilitated chemical genetics. Acc Chem Res 2007; 40:1025-33. [PMID: 17547366 DOI: 10.1021/ar700030k] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Chemical genetics is a powerful method which utilizes small molecule regulators to reveal the molecular basis of diverse biological processes. However, the current chemical genetic approach sometimes meets a serious bottleneck during the process of target identification. One faces difficulty in conjugating the active compound to an affinity matrix without losing or reducing its activity that leads to laborious structure-activity relationship (SAR) studies. To facilitate this process, we have developed a tagged triazine library containing a built-in linker that provides a straightforward transition from phenotypic screening to target identification. A strategy for constructing a tagged library and applications with a streamlined target identification and subsequent mechanistic study are discussed in this Account.
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Affiliation(s)
- Young-Hoon Ahn
- Department of Chemistry, New York University, New York, New York 10003, USA
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22
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Klosi E, Saro D, Spaller MR. Bivalent peptides as PDZ domain ligands. Bioorg Med Chem Lett 2007; 17:6147-50. [PMID: 17890086 PMCID: PMC2169291 DOI: 10.1016/j.bmcl.2007.09.035] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2007] [Revised: 09/06/2007] [Accepted: 09/07/2007] [Indexed: 11/28/2022]
Abstract
A series of multivalent peptides, with the ability to simultaneously bind two separate PDZ domain proteins, has been designed, synthesized, and tested by isothermal titration calorimetry (ITC). The monomer sequences, linked with succinate, varied in length from five to nine residues. The thermodynamic binding parameters, in conjunction with results from mass spectrometry, indicate that a ternary complex is formed in which each peptide arm binds two equivalents of the third PDZ domain (PDZ3) of the neuronal protein PSD-95.
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Affiliation(s)
- Edvin Klosi
- Department of Chemistry, Wayne State University, Detroit, MI 48202, USA
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23
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Zhou HX. Quantitative relation between intermolecular and intramolecular binding of pro-rich peptides to SH3 domains. Biophys J 2006; 91:3170-81. [PMID: 16891373 PMCID: PMC1614496 DOI: 10.1529/biophysj.106.090258] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Flexible linkers are often found to tether binding sequence motifs or connect protein domains. Here we analyze three usages of flexible linkers: 1), intramolecular binding of proline-rich peptides (PRPs) to SH3 domains for kinase regulation; 2), intramolecular binding of PRP for increasing the folding stability of SH3 domains; and 3), covalent linking of PRPs and other ligands for high-affinity bivalent binding. The basis of these analyses is a quantitative relation between intermolecular and intramolecular binding constants. This relation has the form K(i) = K(e0)p for intramolecular binding and K(e) = K(e01)K(e02)p for bivalent binding. The effective concentration p depends on the length of the linker and the distance between the linker attachment points in the bound state. Several applications illustrate the usefulness of the quantitative relation. These include intramolecular binding to the Itk SH3 domain by an internal PRP and to a circular permutant of the alpha-spectrin SH3 domain by a designed PRP, and bivalent binding to the two SH3 domains of Grb2 by two linked PRPs. These and other examples suggest that flexible linkers and sequence motifs tethered to them, like folded protein domains, are also subject to tight control during evolution.
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Affiliation(s)
- Huan-Xiang Zhou
- Department of Physics and Institute of Molecular Biophysics and School of Computational Science, Florida State University, Tallahassee, USA.
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24
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Schneider TL, Mathew RS, Rice KP, Tamaki K, Wood JL, Schepartz A. Increasing the Kinase Specificity of K252a by Protein Surface Recognition. Org Lett 2005; 7:1695-8. [PMID: 15844883 DOI: 10.1021/ol050179o] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] Here we describe a miniature protein (1) that presents the cAMP-dependent protein kinase (PKA) recognition epitope found within the heat-stable Protein Kinase Inhibitor protein (PKI) and a miniature protein conjugate (1-K252a) in which 1 is joined covalently to the high-affinity but nonselective kinase inhibitor K252a. Miniature protein 1 recognizes PKA with an affinity that rivals that of PKI and, in the context of 1-K252a, leads to a dramatic increase in kinase specificity.
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Affiliation(s)
- Tanya L Schneider
- Department of Chemistry and Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520-8107, USA
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25
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Reddy MM, Bachhawat-Sikder K, Kodadek T. Transformation of low-affinity lead compounds into high-affinity protein capture agents. ACTA ACUST UNITED AC 2005; 11:1127-37. [PMID: 15324814 DOI: 10.1016/j.chembiol.2004.05.013] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2004] [Revised: 05/19/2004] [Accepted: 05/20/2004] [Indexed: 11/27/2022]
Abstract
A simple and potentially general approach to the isolation of high-affinity and -specificity protein binding synthetic molecules is presented. A modest affinity lead compound is appended to the end of each molecule in a combinatorial library of oligomeric compounds, such as peptides or peptoids. The library is then screened under conditions too demanding for the lead to support robust binding to the protein target. It was anticipated that this procedure would select for bivalent ligands in which the oligomer library provides both a second binding element as well as an appropriate linker between this element and the lead compound. We report here synthetic ligands for the Mdm2 protein and ubiquitin able to capture their target proteins from dilute solutions in the presence of a large excess of other proteins.
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Affiliation(s)
- M Muralidhar Reddy
- Center for Biomedical Inventions and The Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA
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26
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Vaz RJ, Gao Z, Pribish J, Chen X, Levell J, Davis L, Albert E, Brollo M, Ugolini A, Cramer DM, Cairns J, Sides K, Liu F, Kwong J, Kang J, Rebello S, Elliot M, Lim H, Chellaraj V, Singleton RW, Li Y. Design of bivalent ligands using hydrogen bond linkers: synthesis and evaluation of inhibitors for human β-tryptase. Bioorg Med Chem Lett 2004; 14:6053-6. [PMID: 15546728 DOI: 10.1016/j.bmcl.2004.09.065] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2004] [Revised: 09/23/2004] [Accepted: 09/23/2004] [Indexed: 11/24/2022]
Abstract
We exploit the concept of using hydrogen bonds to link multiple ligands for maintaining simultaneous interactions with polyvalent binding sites. This approach is demonstrated by the syntheses and evaluation of pseudo-bivalent ligands as potent inhibitors of human beta-tryptase.
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Affiliation(s)
- Roy J Vaz
- Aventis Pharmaceuticals, 1041 Route 202/206 N, Bridgewater, NJ 088707, USA
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27
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Affiliation(s)
- Lyle Burdine
- Department of Internal Medicine, Center for Biomedical Inventions, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390 USA
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28
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Wan Y, Hur W, Cho CY, Liu Y, Adrian FJ, Lozach O, Bach S, Mayer T, Fabbro D, Meijer L, Gray NS. Synthesis and Target Identification of Hymenialdisine Analogs. ACTA ACUST UNITED AC 2004; 11:247-59. [PMID: 15123286 DOI: 10.1016/j.chembiol.2004.01.015] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2003] [Revised: 11/18/2003] [Accepted: 11/24/2003] [Indexed: 02/01/2023]
Abstract
Hymenialdisine (HMD) is a sponge-derived natural product kinase inhibitor with nanomolar activity against CDKs, Mek1, GSK3beta, and CK1 and micromolar activity against Chk1. In order to explore the broader application of the pyrrolo[2,3-c]azepine skeleton of HMD as a general kinase inhibitory scaffold, we searched for additional protein targets using affinity chromatography in conjunction with the synthesis of diverse HMD analogs and profiled HMD against a panel of 60 recombinant enzymes. This effort has led to nanomolar to micromolar inhibitors of 11 new targets including p90RSK, KDR, c-Kit, Fes, MAPK1, PAK2, PDK1, PKCtheta, PKD2, Rsk1, and SGK. The synthesis of HMD analogs has resulted in the identification of compounds with enhanced and/or dramatically altered selectivities relative to HMD (28n) and in molecules with antiproliferative activities 30-fold higher than HMD (28p).
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Affiliation(s)
- Yongqin Wan
- Genomics Institute of the Novartis Research Foundation, Department of Chemistry, 10675 John Jay Hopkins Drive, San Diego, CA 92121, USA
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29
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van Ameijde J, Liskamp RMJ. Synthesis of novel trivalent amino acid glycoconjugates based on the cyclotriveratrylene ('CTV') scaffold. Org Biomol Chem 2003; 1:2661-9. [PMID: 12948190 DOI: 10.1039/b303795a] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The convenient synthesis of novel trivalent amino acid glycoconjugates based on cyclotriveratrylene ('CTV') is described. These constructs consist of the CTV scaffold, three oligoethylene glycol spacers of variable length connected to a glyco amino acid residue which can also be varied. The resulting library of trivalent glycoconjugates can be used for studying multivalent interactions.
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Affiliation(s)
- Jeroen van Ameijde
- Department of Medicinal Chemistry, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, PO Box 80082, 3508 TB Utrecht, The Netherlands
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30
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Abstract
Cytoplasmic tyrosine kinases do not occur as isolated catalytic domains. Instead, each kinase family possesses a characteristic array of additional domains that are appended to the catalytic domain. The combination and the arrangement of these modular domains are important in kinase regulation and function. This Account describes how the noncatalytic regions of Src family tyrosine kinases are involved in enzyme regulation, substrate selection, and multisite phosphorylation.
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31
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Merritt EA, Zhang Z, Pickens JC, Ahn M, Hol WGJ, Fan E. Characterization and crystal structure of a high-affinity pentavalent receptor-binding inhibitor for cholera toxin and E. coli heat-labile enterotoxin. J Am Chem Soc 2002; 124:8818-24. [PMID: 12137534 DOI: 10.1021/ja0202560] [Citation(s) in RCA: 115] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Multivalent ligand design constitutes an attractive avenue to the inhibition of receptor recognition and other biological events mediated by oligomeric proteins with multiple binding sites. One example is the design of multivalent receptor blockers targeting members of the AB(5) bacterial toxin family. We report here the synthesis and characterization of a pentavalent inhibitor for cholera toxin and Escherichia coli heat-labile enterotoxin. This inhibitor is an advance over the symmetric pentacyclen-derived inhibitor described in our earlier work in that it presents five copies of m-nitrophenyl-alpha-D-galactoside (MNPG) rather than five copies of beta-D-galactose. The approximately 100-fold higher single-site affinity of MNPG for the toxin receptor binding site relative to galactose is found to yield a proportionate increase in the affinity and IC50 measured for the respective pentavalent constructs. We show by dynamic light scattering that inhibition of receptor binding by the pentavalent inhibitor is due to 1:1 inhibitor:toxin association rather than to inhibitor-mediated aggregation. This 1:1 association is in complete agreement with a 1.46 A resolution crystal structure of the pentavalent inhibitor:toxin complex, which shows that the favorable single-site binding interactions of MNPG are retained by the five arms of the 5256 Da pentavalent MNPG-based inhibitor and that the initial segment of the linking groups interacts with the surface of the toxin B pentamer.
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Affiliation(s)
- Ethan A Merritt
- Department of Biochemistry and Biological Structure, University of Washington, Box 357742, Seattle, Washington 98195, USA
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32
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Martin SE, Peterson BR. A colorimetric enzyme-linked on-bead assay for identification of synthetic substrates of protein tyrosine kinases. J Pept Sci 2002; 8:227-33. [PMID: 12043997 DOI: 10.1002/psc.376] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Protein tyrosine kinases play key roles in the progression of numerous human diseases including several types of cancers. We report here a simple colorimetric assay for tyrosine kinase activity employing synthetic peptide substrates prepared on Tentagel synthesis beads. Phosphorylation of compounds on beads was detected with an antiphosphotyrosine antibody complexed with a secondary antibody-alkaline phosphatase conjugate. This assay may prove useful for the identification and characterization of synthetic substrates of this important class of enzymes.
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Affiliation(s)
- Scott E Martin
- Department of Chemistry, The Pennsylvania State University, University Park 16802, USA
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33
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Abstract
Protein kinases play critical roles in signal transduction pathways by transmitting extracellular signals across the cell membrane to distant locations in the cytoplasm and the nucleus. The development of protein kinase inhibitors has been hindered by the broad overlapping substrate specificities exhibited by these enzymes. The design of bisubstrate analog inhibitors could provide for the enhancement of specificity and potency in protein kinase inhibition. Bisubstrate analog inhibitors form a special group of protein kinase inhibitors that mimic two natural substrates/ligands and that simultaneously associate with two regions of given kinases. Most bisubstrate analogs have been designed to mimic the phosphate donor (ATP) and the acceptor components (Ser-, Thr-, or Tyr-containing peptides). Recent studies have emphasized the importance of maintaining a specific distance between these two components to achieve potent inhibition. In this review, we present a discussion of the methods for designing protein kinase inhibitors by mechanism-based approaches. Emphasis is given to bivalent approaches, with an interpretation of what has been learned from more and less successful examples. Future challenges in this area are also highlighted.
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Affiliation(s)
- Keykavous Parang
- Department of Biomedical Sciences, College of Pharmacy, University of Rhode Island, 41 Lower College Road, Kingston, RI 02881, USA.
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34
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Schaschke N, Matschiner G, Zettl F, Marquardt U, Bergner A, Bode W, Sommerhoff CP, Moroder L. Bivalent inhibition of human beta-tryptase. CHEMISTRY & BIOLOGY 2001; 8:313-27. [PMID: 11325588 DOI: 10.1016/s1074-5521(01)00011-4] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Human beta-tryptase is a mast cell specific trypsin-like serine protease that is thought to play a key role in the pathogenesis of diverse allergic and inflammatory disorders like asthma and psoriasis. The recently resolved crystal structure revealed that the enzymatically active tetramer consists of four quasi-identical monomers. The spatial display of the four identical active sites represents an ideal basis for the rational design of bivalent inhibitors. RESULTS Based on modeling experiments homobivalent inhibitors were constructed using (i) 6A,6D-dideoxy-6A,6D-diamino-beta-cyclodextrin as a rigid template to bridge the space between the two pairs of identical active sites and (ii) 3-(aminomethyl)benzene as a headgroup to occupy the arginine/lysine specific S1 subsites. A comparative analysis of the inhibitory potencies of synthetic constructs that differ in size and type of the spacer between headgroup and template revealed that the construct contained two 3-(aminomethyl)benzenesulfonyl-glycine groups linked to the 6A,6D-diamino groups of beta-cyclodextrin as an almost ideal bivalent inhibitor with a cooperativity factor of 1.9 vs. the ideal value of 2. The bivalent binding mode is supported by the inhibitor/tetramer ratio of 2:1 required for inactivation of tryptase and by X-ray analysis of the inhibitor/tryptase complex. CONCLUSION The results obtained with the rigid cyclodextrin template underlined the importance of a minimal loss of conformational entropy in bivalent binding, but also showed the limitations imposed by such rigid core molecules in terms of optimal occupancy of binding sites and thus of enthalpic strains in bidentate binding modes. The main advantage of bivalent inhibitors is their high selectivity for the target enzyme that can be achieved utilizing the principle of multivalency.
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Affiliation(s)
- N Schaschke
- Max-Planck-Institut für Biochemie, Am Klopferspitz 18a, D-82152 Martinsried, Germany
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35
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Profit AA, Lee TR, Niu J, Lawrence DS. Molecular rulers: an assessment of distance and spatial relationships of Src tyrosine kinase Sh2 and active site regions. J Biol Chem 2001; 276:9446-51. [PMID: 11118446 DOI: 10.1074/jbc.m009262200] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The three-dimensional structures of the inactive conformations of Hck and Src, members of the Src protein-tyrosine kinase family, have recently been described. In both cases, the catalytic domain lies on the opposite face of the enzyme from the SH2 and SH3 domains. The active conformation of these enzymes has not yet been described. Given the known role of the SH2 and SH3 domains in promoting substrate binding, enzyme activation likely reorients the relative spatial arrangement between the SH2/SH3 domains and the active site region. We describe herein a series of "molecular rulers" and their use in assessing the topological and spatial relationships of the SH2 and active site regions of the Src protein-tyrosine kinase. These synthetic compounds contain sequences that are active site-directed (-Glu-Glu-Ile-Ile-(F(5))Phe-, where (F(5))Phe is pentafluorophenylalanine) and SH2-directed (-Tyr(P)-Glu-Glu-Ile-Glu-), separated by a sequence of variable length. The most potent bivalent compound, acetyl-Glu-Glu-Leu-Leu-(F(5))Phe-(GABA)(3)-Tyr(P)-Glu-Glu-Ile-Glu-amide (where GABA is gamma-aminobutyric acid), displays a >120-fold enhancement in inhibitory potency relative to the simple monovalent active site-directed species, acetyl-Glu-Glu-Leu-Leu-(F(5))Phe-amide. The short linker length (3 GABA residues) between the active site- and SH2-directed peptide fragments suggests that the corresponding domains on the Src kinase can assume a nearly contiguous spatial arrangement in the active form of the enzyme.
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Affiliation(s)
- A A Profit
- Department of Biochemistry, Albert Einstein College of Medicine of Yeshiva University, Bronx, New York 10461, USA
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36
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Abstract
High-resolution crystal structures of AB(5) toxins in their native form or in complex with a variety of ligands have led to the structure-based design and discovery of inhibitors targeting different areas of the toxins. The most significant progress is the development of highly potent multivalent ligands that block binding of the toxins to their receptors.
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Affiliation(s)
- E Fan
- Department of Biological Structure, Biomolecular Structure Center, WA Seattle, WA 98195, USA
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37
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Kraker AJ, Hartl BG, Amar AM, Barvian MR, Showalter HD, Moore CW. Biochemical and cellular effects of c-Src kinase-selective pyrido[2, 3-d]pyrimidine tyrosine kinase inhibitors. Biochem Pharmacol 2000; 60:885-98. [PMID: 10974196 DOI: 10.1016/s0006-2952(00)00405-6] [Citation(s) in RCA: 112] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Increased expression or activity of c-Src tyrosine kinase has been associated with the transformed phenotype in tumor cells and with progression of neoplastic disease. A number of pyrido[2, 3-d]pyrimidines have been characterized biochemically and in cells as part of an assessment of their potential as anti-tumor agents. The compounds were ATP-competitive inhibitors of c-Src kinase with IC(50) values < 10 nM and from 6 to >100-fold selectivity for c-Src tyrosine kinase relative to basic fibroblast growth factor receptor (bFGFr) tyrosine kinase, platelet-derived growth factor receptor (PDGFr) tyrosine kinase, and epidermal growth factor receptor (EGFr) tyrosine kinase. The compounds yielded IC(50) values < 5 nM against Lck. Human colon tumor cell growth in culture was inhibited, as was colony formation in soft agar at concentrations < 1 microM. Phosphorylation of the c-Src cellular substrates paxillin, p130(cas), and Stat3 was also inhibited at concentrations < 1 microM. Autophosphorylation of EGFr tyrosine kinase or PDGFr tyrosine kinase was not inhibited by c-Src inhibitors, thus showing the selective nature of the compounds in cells. In a mitogenesis assay measuring thymidine incorporation stimulated by specific mitogens, the c-Src tyrosine kinase inhibitors reduced incorporated thymidine in a manner consistent with previously reported roles of c-Src in mitogenic signaling. Progression through the cell cycle was inhibited at G(2)/M in human colon tumor cells treated with two of the c-Src-selective compounds, which is also consistent with earlier reports describing a requirement for active c-Src tyrosine kinase for G(2) to M phase progression. The compounds described here are selective inhibitors of c-Src tyrosine kinase and have antiproliferative effects in tumor cells consistent with inhibition of c-Src.
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Affiliation(s)
- A J Kraker
- Department of Cancer Research Parke-Davis Pharmaceutical Research, Division of the Warner-Lambert Co., Ann Arbor, MI 48105, USA.
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38
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Fan E, Zhang Z, Minke WE, Hou Z, Verlinde CLMJ, Hol WGJ. High-Affinity Pentavalent Ligands of Escherichia coli Heat-Labile Enterotoxin by Modular Structure-Based Design. J Am Chem Soc 2000. [DOI: 10.1021/ja993388a] [Citation(s) in RCA: 176] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Erkang Fan
- Department of Biological Structure Biomolecular Structure Center and Howard Hughes Medical Institute University of Washington, Box 357742 Seattle, Washington 98195
| | - Zhongsheng Zhang
- Department of Biological Structure Biomolecular Structure Center and Howard Hughes Medical Institute University of Washington, Box 357742 Seattle, Washington 98195
| | - Wendy E. Minke
- Department of Biological Structure Biomolecular Structure Center and Howard Hughes Medical Institute University of Washington, Box 357742 Seattle, Washington 98195
| | - Zheng Hou
- Department of Biological Structure Biomolecular Structure Center and Howard Hughes Medical Institute University of Washington, Box 357742 Seattle, Washington 98195
| | - Christophe L. M. J. Verlinde
- Department of Biological Structure Biomolecular Structure Center and Howard Hughes Medical Institute University of Washington, Box 357742 Seattle, Washington 98195
| | - Wim G. J. Hol
- Department of Biological Structure Biomolecular Structure Center and Howard Hughes Medical Institute University of Washington, Box 357742 Seattle, Washington 98195
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39
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Abstract
Several tyrosine and serine/threonine protein kinases have emerged in the last few years as attractive targets in the search for new therapeutic agents being applicable in many different disease indications. Initially, inhibition of these protein kinases by ATP site-directed inhibitors was considered less prone to success, but medicinal chemists from both academia and industry have been able to impart potency and selectivity to a limited number of scaffolds by modulating and fine-tuning the interactions of the modified template with the ATP binding site of the selected kinase. The chemical templates that have been used in the synthesis of ATP site-directed protein kinase inhibitors are reviewed with emphasis on the kinase inhibitors that have entered or are about to enter clinical trials. Examples have been selected to illustrate how structure-based design approaches and new methods to increase compound diversity have had an impact on this area of research.
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