1
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Lee TK, Kassees K, Chen CY, Viswanadhapalli S, Parra K, Vadlamudi RK, Ahn JM. Structure-Activity Relationship Study of Tris-Benzamides as Estrogen Receptor Coregulator Binding Modulators. ACS Pharmacol Transl Sci 2024; 7:2023-2043. [PMID: 39022350 PMCID: PMC11249634 DOI: 10.1021/acsptsci.4c00125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 06/11/2024] [Accepted: 06/17/2024] [Indexed: 07/20/2024]
Abstract
Estrogen receptor coregulator binding modulators (ERXs) are a novel class of molecules targeting the interaction between estrogen receptor α (ERα) and its coregulator proteins, which has proven to be an attractive strategy for overcoming endocrine resistance in breast cancer. We previously reported ERX-11, an orally bioavailable tris-benzamide, that demonstrated promising antitumor activity against ERα-positive breast cancer cells. To comprehend the significance of the substituents in ERX-11, we carried out structure-activity relationship studies. In addition, we introduced additional alkyl substituents at either the N- or C-terminus to improve binding affinity and biological activity. Further optimization guided by conformational restriction led to the identification of a trans-4-phenylcyclcohexyl group at the C-terminus (18h), resulting in a greater than 10-fold increase in binding affinity and cell growth inhibition potency compared to ERX-11. Tris-benzamide 18h disrupted the ERα-coregulator interaction and inhibited the ERα-mediated transcriptional activity. It demonstrated strong antiproliferative activity on ERα-positive breast cancer cells both in vitro and in vivo, offering a promising potential as a therapeutic candidate for treating ERα-positive breast cancer.
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Affiliation(s)
- Tae-Kyung Lee
- Department
of Chemistry and Biochemistry, University
of Texas at Dallas, Richardson, Texas 75080, United States
| | - Kara Kassees
- Department
of Chemistry and Biochemistry, University
of Texas at Dallas, Richardson, Texas 75080, United States
| | - Chia-Yuan Chen
- Department
of Chemistry and Biochemistry, University
of Texas at Dallas, Richardson, Texas 75080, United States
| | - Suryavathi Viswanadhapalli
- Department
of Obstetrics and Gynecology, University
of Texas Health, San Antonio, Texas 78229, United States
| | - Karla Parra
- Departments
of Urology and Pharmacology, University
of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
| | - Ratna K. Vadlamudi
- Department
of Obstetrics and Gynecology, University
of Texas Health, San Antonio, Texas 78229, United States
| | - Jung-Mo Ahn
- Department
of Chemistry and Biochemistry, University
of Texas at Dallas, Richardson, Texas 75080, United States
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2
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Chen CY, Elmore S, Lalami I, Neal H, Vadlamudi RK, Raj GV, Ahn JM. Oligo-benzamide-based peptide mimicking tools for modulating biology. Methods Enzymol 2024; 698:221-245. [PMID: 38886033 DOI: 10.1016/bs.mie.2024.04.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
The oligo-benzamide scaffold is a rigid organic framework that can hold 2-3 functional groups as O-alkyl substituents on its benzamide units, mirroring their natural arrangement in an α-helix. Oligo-benzamides demonstrated outstanding α-helix mimicry and can be readily synthesized by following high yielding and iterative reaction steps in both solution-phase and solid-phase. A number of oligo-benzamides have been designed to emulate α-helical peptide segments in biologically active proteins and showed strong protein binding, in turn effectively disrupting protein-protein interactions in vitro and in vivo. In this chapter, the design of oligo-benzamides for mimicking α-helices, efficient synthetic routes for producing them, and their biomedical studies showing remarkable potency in inhibiting protein functions are discussed.
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Affiliation(s)
- Chia-Yuan Chen
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, TX, United States
| | - Scott Elmore
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, TX, United States
| | - Ismail Lalami
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, TX, United States
| | - Henry Neal
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, TX, United States
| | - Ratna K Vadlamudi
- Department of Obstetrics and Gynecology, University of Texas Health Science Center at San Antonio, San Antonio, TX, United States
| | - Ganesh V Raj
- Department of Urology, University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - Jung-Mo Ahn
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, TX, United States.
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3
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Haque M, Flack T, Singh R, Wall A, de Castro GV, Jiang L, White AJP, Barnard A. Aromatic oligoesters as novel helix mimetic scaffolds. Bioorg Med Chem 2023; 87:117311. [PMID: 37182518 DOI: 10.1016/j.bmc.2023.117311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 04/25/2023] [Accepted: 04/28/2023] [Indexed: 05/16/2023]
Abstract
The design, synthesis, and conformational analysis of a novel aromatic oligoester helix mimetic scaffold is reported. A range of amino acid-type side-chain functionality can be readily incorporated into monomer building blocks over three facile synthetic steps. Analysis of representative dimers revealed a stable conformer capable of effective mimicry of a canonical α-helix and the scaffold was found to be surprisingly stable to degradation in aqueous solutions at acidic and neutral pH.
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Affiliation(s)
- Muhammed Haque
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London W12 0BZ, UK
| | - Theo Flack
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London W12 0BZ, UK
| | - Ravi Singh
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London W12 0BZ, UK
| | - Archie Wall
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London W12 0BZ, UK
| | | | - Lishen Jiang
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London W12 0BZ, UK
| | - Andrew J P White
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London W12 0BZ, UK
| | - Anna Barnard
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London W12 0BZ, UK.
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4
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Kell S, Wang Z, Ji H. Common Structural Features of Hydrophobic α-Helical Hot Spots: Insights for the Design of Novel α-Helix Mimetics. ACS Med Chem Lett 2022; 13:1670-1677. [PMID: 36262397 PMCID: PMC9575182 DOI: 10.1021/acsmedchemlett.2c00296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 09/02/2022] [Indexed: 11/28/2022] Open
Abstract
The binding conformations of α-helical hydrophobic hot spots are convergent into two spatial areas in protein-protein complex structures. The physical basis for convergence was disclosed, which allows the development of pharmacophore models for i/i + 4/i + 7 or i/i + 3/i + 4 α-helical hot spots. Further investigation revealed that this convergence of binding conformations is common among all hydrophobic hot spots regardless of their α-helical positions. This observation led to a streamlined generation of pharmacophore models for hydrophobic hot spots at any positions along the α-helix. These successfully evaluated pharmacophore models may be useful for designing novel α-helical hot spot mimetics.
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Affiliation(s)
- Shelby
R. Kell
- Drug
Discovery Department, H. Lee Moffitt Cancer
Center & Research Institute, Tampa, Florida 33612, United States
- Department
of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | - Zhen Wang
- Drug
Discovery Department, H. Lee Moffitt Cancer
Center & Research Institute, Tampa, Florida 33612, United States
- Department
of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | - Haitao Ji
- Drug
Discovery Department, H. Lee Moffitt Cancer
Center & Research Institute, Tampa, Florida 33612, United States
- Department
of Chemistry, University of South Florida, Tampa, Florida 33620, United States
- Department
of Oncologic Sciences, University of South
Florida, Tampa, Florida 33620, United
States
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5
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Trobe M, Vareka M, Schreiner T, Dobrounig P, Doler C, Holzinger EB, Steinegger A, Breinbauer R. Modular Synthesis of Teraryl‐based alpha ‐Helix Mimetics, Part 3: Iodophenyltriflate Core Fragments Featuring Side Chains of Proteinogenic Amino Acids. European J Org Chem 2022; 2022:e202101278. [PMID: 35910459 PMCID: PMC9306992 DOI: 10.1002/ejoc.202101278] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 02/08/2022] [Indexed: 11/18/2022]
Abstract
Teraryl‐based α‐helix mimetics have proven to be useful compounds for the inhibition of protein‐protein interactions (PPI). We have developed a modular and flexible approach for the synthesis of teraryl‐based α‐helix mimetics using a benzene core unit featuring two leaving groups of differentiated reactivity in the Pd‐catalyzed cross‐coupling used for teraryl assembly. In previous publications we have introduced the methodology of 4‐iodophenyltriflates decorated with the side chains of some of the proteinogenic amino acids. We herein report the core fragments corresponding to the previously missing amino acids Arg, Asn, Asp, Met, Trp and Tyr. Therefore, our set now encompasses all relevant amino acid analogues with the exception of His. In order to be compatible with the triflate moiety, some of the nucleophilic side chains had to be provided in a protected form to serve as stable building blocks. Additionally, cross‐coupling procedures for the assembly of teraryls were investigated.
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Affiliation(s)
- Melanie Trobe
- Graz University of Technology: Technische Universitat Graz Institute of Organic Chemistry AUSTRIA
| | - Martin Vareka
- Graz University of Technology: Technische Universitat Graz Institute of Organic Chemistry AUSTRIA
| | - Till Schreiner
- Graz University of Technology: Technische Universitat Graz Institute of Organic Chemistry AUSTRIA
| | - Patrick Dobrounig
- Graz University of Technology: Technische Universitat Graz Institute of Organic Chemistry AUSTRIA
| | - Carina Doler
- Graz University of Technology: Technische Universitat Graz Institute of Organic Chemistry AUSTRIA
| | - Ella B. Holzinger
- Graz University of Technology: Technische Universitat Graz Institute of Organic Chemistry AUSTRIA
| | - Andreas Steinegger
- Graz University of Technology: Technische Universitat Graz Institute of Organic Chemistry AUSTRIA
| | - Rolf Breinbauer
- Technische Universitat Graz Institute of Organic Chemistry Stremayrgasse 9 A-8010 Graz AUSTRIA
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6
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Hawkins PME, Liu DY, Linington RG, Payne RJ. Solid-phase synthesis of coralmycin A/ epi-coralmycin A and desmethoxycoralmycin A. Org Biomol Chem 2021; 19:6291-6300. [PMID: 34212970 DOI: 10.1039/d1ob01062j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The total synthesis of the natural product coralmycin A/epi-coralmycin A, as well as a desmethoxy analogue is described. Synthesis was achieved via a divergent, bidirectional solid-phase strategy, including a key on-resin O-acylation, O to N acyl shift, and O-alkylation protocol to incorporate the unusual 4-amino-2-hydroxy-3-isopropoxybenzoic acid motifs. The synthetic natural product was generated as a 1 : 1 mixture of epimers at the central β-methoxyasparagine residue and exhibited potent antibacterial activity against a panel of ten Gram-negative and seven Gram-positive organisms. The desmethoxy analogue possessed significantly more potent antimicrobial activity against this panel with minimal inhibitory concentrations (MICs) as low as 50 nM.
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Affiliation(s)
- Paige M E Hawkins
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia. and Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, NSW 2006, Australia
| | - Dennis Y Liu
- Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
| | - Roger G Linington
- Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
| | - Richard J Payne
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia. and Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, NSW 2006, Australia
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7
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A Structure-Activity Relationship Study of Bis-Benzamides as Inhibitors of Androgen Receptor-Coactivator Interaction. Molecules 2019; 24:molecules24152783. [PMID: 31370197 PMCID: PMC6696232 DOI: 10.3390/molecules24152783] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 07/26/2019] [Accepted: 07/30/2019] [Indexed: 02/05/2023] Open
Abstract
The interaction between androgen receptor (AR) and coactivator proteins plays a critical role in AR-mediated prostate cancer (PCa) cell growth, thus its inhibition is emerging as a promising strategy for PCa treatment. To develop potent inhibitors of the AR-coactivator interaction, we have designed and synthesized a series of bis-benzamides by modifying functional groups at the N/C-terminus and side chains. A structure-activity relationship study showed that the nitro group at the N-terminus of the bis-benzamide is essential for its biological activity while the C-terminus can have either a methyl ester or a primary carboxamide. Surveying the side chains with various alkyl groups led to the identification of a potent compound 14d that exhibited antiproliferative activity (IC50 value of 16 nM) on PCa cells. In addition, biochemical studies showed that 14d exerts its anticancer activity by inhibiting the AR-PELP1 interaction and AR transactivation.
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8
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Karekar VV, Bhoge BA, Saraogi I. An expeditious synthetic route to proteomimetic foldamers. NEW J CHEM 2019. [DOI: 10.1039/c8nj04758h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a method for rapid generation of an α-helix proteomimetic library via the late stage modification of a protected oligobenzamide intermediate.
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Affiliation(s)
- Vaibhav V. Karekar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal
- India
| | - Bapurao A. Bhoge
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal
- India
| | - Ishu Saraogi
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal
- India
- Department of Biological Sciences, Indian Institute of Science Education and Research Bhopal
- India
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9
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Raj GV, Sareddy GR, Ma S, Lee TK, Viswanadhapalli S, Li R, Liu X, Murakami S, Chen CC, Lee WR, Mann M, Krishnan SR, Manandhar B, Gonugunta VK, Strand D, Tekmal RR, Ahn JM, Vadlamudi RK. Estrogen receptor coregulator binding modulators (ERXs) effectively target estrogen receptor positive human breast cancers. eLife 2017; 6. [PMID: 28786813 PMCID: PMC5548489 DOI: 10.7554/elife.26857] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 07/05/2017] [Indexed: 12/22/2022] Open
Abstract
The majority of human breast cancer is estrogen receptor alpha (ER) positive. While anti-estrogens/aromatase inhibitors are initially effective, resistance to these drugs commonly develops. Therapy-resistant tumors often retain ER signaling, via interaction with critical oncogenic coregulator proteins. To address these mechanisms of resistance, we have developed a novel ER coregulator binding modulator, ERX-11. ERX-11 interacts directly with ER and blocks the interaction between a subset of coregulators with both native and mutant forms of ER. ERX-11 effectively blocks ER-mediated oncogenic signaling and has potent anti-proliferative activity against therapy-sensitive and therapy-resistant human breast cancer cells. ERX-11 is orally bioavailable, with no overt signs of toxicity and potent activity in both murine xenograft and patient-derived breast tumor explant models. This first-in-class agent, with its novel mechanism of action of disrupting critical protein-protein interactions, overcomes the limitations of current therapies and may be clinically translatable for patients with therapy-sensitive and therapy-resistant breast cancers. DOI:http://dx.doi.org/10.7554/eLife.26857.001 Around 70% of breast cancers in women need one or both of the female hormones (estrogen and progesterone) to grow. To treat these 'hormone-dependent' cancers, patients receive drugs that either block the production of estrogen or directly target a receptor protein that senses estrogen in the cancer cells. Unfortunately, many breast cancers develop resistance to these drugs. This resistance is often caused by genetic mutations that alter the estrogen receptor; for example, the receptor may develop the ability to interact with other proteins in the cell known as coregulators to promote tumor growth. Developing new drugs that prevent estrogen receptors from interacting with coregulators may provide more options for treating hormone-dependent breast cancers. Here, Raj et al. developed a new small molecule named ERX-11 that is able to inhibit the growth of human breast cancer cells that are sensitive to existing drugs as well as cells that have become drug-resistant. For the experiments, hormone-dependent breast cancer cells from humans were transplanted into mice. This procedure usually causes the mice to develop tumors, but giving the mice ERX-11 by mouth stopped estrogen receptors from interacting with coregulators and blocked the growth of tumors. Furthermore, ERX-11 does not appear to have any toxic effects on the mice, indicating that it may also be safe for humans. The findings of Raj et al. suggest that ERX-11 is a promising new drug candidate for treating some breast cancers. The next steps are to examine the effects of ERX-11 on mice and other animals in more detail before deciding whether this molecule is suitable for clinical trials. In the longer term, molecules similar to ERX-11 could also be developed into drugs to treat other types of cancer that are also caused by abnormal interactions of coregulator proteins. DOI:http://dx.doi.org/10.7554/eLife.26857.002
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Affiliation(s)
- Ganesh V Raj
- Departments of Urology and Pharmacology, University of Texas Southwestern Medical Center at Dallas, Dallas, United States
| | - Gangadhara Reddy Sareddy
- Department of Obstetrics and Gynecology, University of Texas Health Science Center, San Antonio, United States.,CDP program, University of Texas Health Cancer Center, San Antonio, United States
| | - Shihong Ma
- Departments of Urology and Pharmacology, University of Texas Southwestern Medical Center at Dallas, Dallas, United States
| | - Tae-Kyung Lee
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, United States
| | - Suryavathi Viswanadhapalli
- Department of Obstetrics and Gynecology, University of Texas Health Science Center, San Antonio, United States
| | - Rui Li
- Departments of Urology and Pharmacology, University of Texas Southwestern Medical Center at Dallas, Dallas, United States
| | - Xihui Liu
- Departments of Urology and Pharmacology, University of Texas Southwestern Medical Center at Dallas, Dallas, United States
| | - Shino Murakami
- Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, United States.,Laboratory of Signaling and Gene Regulation, Cecil H and Ida Green Center for Reproductive Biology Sciences and Division of Basic Reproductive Biology Research, University of Texas Southwestern Medical Center, Dallas, United States
| | - Chien-Cheng Chen
- Departments of Urology and Pharmacology, University of Texas Southwestern Medical Center at Dallas, Dallas, United States
| | - Wan-Ru Lee
- Departments of Urology and Pharmacology, University of Texas Southwestern Medical Center at Dallas, Dallas, United States
| | - Monica Mann
- Department of Obstetrics and Gynecology, University of Texas Health Science Center, San Antonio, United States
| | - Samaya Rajeshwari Krishnan
- Department of Obstetrics and Gynecology, University of Texas Health Science Center, San Antonio, United States
| | - Bikash Manandhar
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, United States
| | - Vijay K Gonugunta
- Department of Obstetrics and Gynecology, University of Texas Health Science Center, San Antonio, United States
| | - Douglas Strand
- Departments of Urology and Pharmacology, University of Texas Southwestern Medical Center at Dallas, Dallas, United States
| | - Rajeshwar Rao Tekmal
- Department of Obstetrics and Gynecology, University of Texas Health Science Center, San Antonio, United States.,CDP program, University of Texas Health Cancer Center, San Antonio, United States
| | - Jung-Mo Ahn
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, United States
| | - Ratna K Vadlamudi
- Department of Obstetrics and Gynecology, University of Texas Health Science Center, San Antonio, United States.,CDP program, University of Texas Health Cancer Center, San Antonio, United States
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10
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Busschaert N, Thompson S, Hamilton AD. An α-helical peptidomimetic scaffold for dynamic combinatorial library formation. Chem Commun (Camb) 2017; 53:313-316. [DOI: 10.1039/c6cc07787k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A novel oligobenzamide-based α-helix mimetic was designed and synthesised with either imine or hydrazone functionalities that serve both to pre-organise the side-chain vectors to mimic the i, i + 4 and i + 7 residues of an α-helix, and to allow for the facile creation of dynamic libraries.
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Affiliation(s)
- Nathalie Busschaert
- Department of Chemistry
- New York University
- New York
- USA
- Chemistry Research Laboratory
| | - Sam Thompson
- Chemistry Research Laboratory
- University of Oxford
- UK
- Chemistry
- University of Southampton
| | - Andrew D. Hamilton
- Department of Chemistry
- New York University
- New York
- USA
- Chemistry Research Laboratory
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11
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Burslem GM, Kyle HF, Prabhakaran P, Breeze AL, Edwards TA, Warriner SL, Nelson A, Wilson AJ. Synthesis of highly functionalized oligobenzamide proteomimetic foldamers by late stage introduction of sensitive groups. Org Biomol Chem 2016; 14:3782-6. [PMID: 27005701 PMCID: PMC4839272 DOI: 10.1039/c6ob00078a] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Accepted: 03/14/2016] [Indexed: 12/26/2022]
Abstract
α-Helix proteomimetics represent an emerging class of ligands that can be used to inhibit an array of helix mediated protein-protein interactions. Within this class of inhibitor, aromatic oligobenzamide foldamers have been widely and successfully used. This manuscript describes alternative syntheses of these compounds that can be used to access mimetics that are challenging to synthesize using previously described methodologies, permitting access to compounds functionalized with multiple sensitive side chains and accelerated library assembly through late stage derivatisation.
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Affiliation(s)
- George M Burslem
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS29JT, UK. and Astbury Centre for Structural Molecular Biology, University of Leeds, Woodhouse Lane, Leeds, LS29JT, UK
| | - Hannah F Kyle
- Astbury Centre for Structural Molecular Biology, University of Leeds, Woodhouse Lane, Leeds, LS29JT, UK and School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK
| | - Panchami Prabhakaran
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS29JT, UK. and Astbury Centre for Structural Molecular Biology, University of Leeds, Woodhouse Lane, Leeds, LS29JT, UK
| | - Alexander L Breeze
- Astbury Centre for Structural Molecular Biology, University of Leeds, Woodhouse Lane, Leeds, LS29JT, UK and School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK and Discovery Sciences, AstraZeneca R&D, Alderley Park, Cheshire, SK10 4TG, UK
| | - Thomas A Edwards
- Astbury Centre for Structural Molecular Biology, University of Leeds, Woodhouse Lane, Leeds, LS29JT, UK and School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK
| | - Stuart L Warriner
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS29JT, UK. and Astbury Centre for Structural Molecular Biology, University of Leeds, Woodhouse Lane, Leeds, LS29JT, UK
| | - Adam Nelson
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS29JT, UK. and Astbury Centre for Structural Molecular Biology, University of Leeds, Woodhouse Lane, Leeds, LS29JT, UK
| | - Andrew J Wilson
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS29JT, UK. and Astbury Centre for Structural Molecular Biology, University of Leeds, Woodhouse Lane, Leeds, LS29JT, UK
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12
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Trobe M, Breinbauer R. Improved and scalable synthesis of building blocks for the modular synthesis of teraryl-based alpha-helix mimetics. MONATSHEFTE FUR CHEMIE 2015. [DOI: 10.1007/s00706-015-1599-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Wilson AJ. Helix mimetics: Recent developments. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2015; 119:33-40. [DOI: 10.1016/j.pbiomolbio.2015.05.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2015] [Revised: 05/21/2015] [Accepted: 05/22/2015] [Indexed: 12/19/2022]
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14
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Pelay-Gimeno M, Glas A, Koch O, Grossmann TN. Structure-Based Design of Inhibitors of Protein-Protein Interactions: Mimicking Peptide Binding Epitopes. Angew Chem Int Ed Engl 2015; 54:8896-927. [PMID: 26119925 PMCID: PMC4557054 DOI: 10.1002/anie.201412070] [Citation(s) in RCA: 496] [Impact Index Per Article: 55.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Indexed: 12/15/2022]
Abstract
Protein-protein interactions (PPIs) are involved at all levels of cellular organization, thus making the development of PPI inhibitors extremely valuable. The identification of selective inhibitors is challenging because of the shallow and extended nature of PPI interfaces. Inhibitors can be obtained by mimicking peptide binding epitopes in their bioactive conformation. For this purpose, several strategies have been evolved to enable a projection of side chain functionalities in analogy to peptide secondary structures, thereby yielding molecules that are generally referred to as peptidomimetics. Herein, we introduce a new classification of peptidomimetics (classes A-D) that enables a clear assignment of available approaches. Based on this classification, the Review summarizes strategies that have been applied for the structure-based design of PPI inhibitors through stabilizing or mimicking turns, β-sheets, and helices.
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Affiliation(s)
- Marta Pelay-Gimeno
- Chemical Genomics Centre of the Max Planck SocietyOtto-Hahn-Strasse 15, 44227 Dortmund (Germany) E-mail:
| | - Adrian Glas
- Chemical Genomics Centre of the Max Planck SocietyOtto-Hahn-Strasse 15, 44227 Dortmund (Germany) E-mail:
| | - Oliver Koch
- TU Dortmund University, Department of Chemistry and Chemical BiologyOtto-Hahn-Strasse 6, 44227 Dortmund (Germany)
| | - Tom N Grossmann
- Chemical Genomics Centre of the Max Planck SocietyOtto-Hahn-Strasse 15, 44227 Dortmund (Germany) E-mail:
- TU Dortmund University, Department of Chemistry and Chemical BiologyOtto-Hahn-Strasse 6, 44227 Dortmund (Germany)
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15
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Peterson-Kaufman KJ, Haase HS, Boersma MD, Lee EF, Fairlie WD, Gellman SH. Residue-Based Preorganization of BH3-Derived α/β-Peptides: Modulating Affinity, Selectivity and Proteolytic Susceptibility in α-Helix Mimics. ACS Chem Biol 2015; 10:1667-75. [PMID: 25946900 DOI: 10.1021/acschembio.5b00109] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We report progress toward a general strategy for mimicking the recognition properties of specific α-helices within natural proteins through the use of oligomers that are less susceptible than conventional peptides to proteolysis. The oligomers contain both α- and β-amino acid residues, with the density of the β subunits low enough that an α-helix-like conformation can be adopted but high enough to interfere with protease activity. Previous studies with a different protein-recognition system that suggested ring-constrained β residues can be superior to flexible β residues in terms of maximizing α/β-peptide affinity for a targeted protein surface. Here, we use mimicry of the 18-residue Bim BH3 domain to expand the scope of this strategy. Two significant advances have been achieved. First, we have developed and validated a new ring-constrained β residue that bears an acidic side chain, which complements previously known analogues that are either hydrophobic or basic. Second, we have discovered that placing cyclic β residues at sites that make direct contact with partner proteins can lead to substantial discrimination between structurally homologous binding partners, the proteins Bcl-xL and Mcl-1. Overall, this study helps to establish that α/β-peptides containing ring-preorganized β residues can reliably provide proteolytically resistant ligands for proteins that naturally evolved to recognize α-helical partners.
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Affiliation(s)
| | - Holly S. Haase
- Department
of Chemistry, University of Wisconsin, 1101 University Ave., Madison, Wisconsin 53706, United States
| | - Melissa D. Boersma
- Department
of Chemistry, University of Wisconsin, 1101 University Ave., Madison, Wisconsin 53706, United States
| | - Erinna F. Lee
- Structural
Biology Division, The Walter and Eliza Hall Institute for Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia
- Department
of Medical Biology, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - W. Douglas Fairlie
- Structural
Biology Division, The Walter and Eliza Hall Institute for Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia
- Department
of Medical Biology, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Samuel H. Gellman
- Department
of Chemistry, University of Wisconsin, 1101 University Ave., Madison, Wisconsin 53706, United States
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16
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Pelay-Gimeno M, Glas A, Koch O, Grossmann TN. Strukturbasierte Entwicklung von Protein-Protein-Interaktionsinhibitoren: Stabilisierung und Nachahmung von Peptidliganden. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201412070] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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17
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Moon H, Lim HS. Synthesis and screening of small-molecule α-helix mimetic libraries targeting protein–protein interactions. Curr Opin Chem Biol 2015; 24:38-47. [DOI: 10.1016/j.cbpa.2014.10.023] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2014] [Revised: 10/27/2014] [Accepted: 10/28/2014] [Indexed: 12/11/2022]
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18
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Barnard A, Miles JA, Burslem GM, Barker AM, Wilson AJ. Multivalent helix mimetics for PPI-inhibition. Org Biomol Chem 2015; 13:258-64. [DOI: 10.1039/c4ob02066a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A multivalent helix mimetic is developed that inhibits the p53/hDM2 and induces dimerization/aggregation of its target – hDM2.
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Affiliation(s)
- Anna Barnard
- School of Chemistry
- University of Leeds
- Leeds
- UK
- Astbury Centre for Structural and Molecular Biology
| | - Jennifer A. Miles
- School of Chemistry
- University of Leeds
- Leeds
- UK
- Astbury Centre for Structural and Molecular Biology
| | - George M. Burslem
- School of Chemistry
- University of Leeds
- Leeds
- UK
- Astbury Centre for Structural and Molecular Biology
| | - Amy M. Barker
- Astbury Centre for Structural and Molecular Biology
- University of Leeds
- Leeds
- UK
- School of Molecular and Cellular Biology
| | - Andrew J. Wilson
- School of Chemistry
- University of Leeds
- Leeds
- UK
- Astbury Centre for Structural and Molecular Biology
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19
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Moon H, Lee WS, Oh M, Lee H, Lee JH, Im W, Lim HS. Design, solid-phase synthesis, and evaluation of a phenyl-piperazine-triazine scaffold as α-helix mimetics. ACS COMBINATORIAL SCIENCE 2014; 16:695-701. [PMID: 25336412 DOI: 10.1021/co500114f] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
α-Helices play a critical role in mediating many protein-protein interactions (PPIs) as recognition motifs. Therefore, there is a considerable interest in developing small molecules that can mimic helical peptide segments to modulate α-helix-mediated PPIs. Due to the relatively low aqueous solubility and synthetic difficulty of most current α-helix mimetic small molecules, one important goal in this area is to develop small molecules with favorable physicochemical properties and ease of synthesis. Here we designed phenyl-piperazine-triazine-based α-helix mimetics that possess improved water solubility and excellent synthetic accessibility. We developed a facile solid-phase synthetic route that allows for rapid creation of a large, diverse combinatorial library of α-helix mimetics. Further, we identified a selective inhibitor of the Mcl-1/BH3 interaction by screening a focused library of phenyl-piperazine-triazines, demonstrating that the scaffold is able to serve as functional mimetics of α-helical peptides. We believe that our phenyl-piperazine-triazine-based α-helix mimetics, along with the facile and divergent solid-phase synthetic method, have great potential as powerful tools for discovering potent inhibitors of given α-helix-mediated PPIs.
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Affiliation(s)
- Heejo Moon
- Department
of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 790-784, South Korea
| | - Woo Sirl Lee
- Department
of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 790-784, South Korea
| | - Misook Oh
- Department
of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 790-784, South Korea
- Department
of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, Indiana 46032, United States
| | - Huisun Lee
- Department
of Molecular Biosciences and Centre for Bioinformatics, The University of Kansas, Lawrence, Kansas 66047, United States
| | - Ji Hoon Lee
- Department
of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 790-784, South Korea
| | - Wonpil Im
- Department
of Molecular Biosciences and Centre for Bioinformatics, The University of Kansas, Lawrence, Kansas 66047, United States
| | - Hyun-Suk Lim
- Department
of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 790-784, South Korea
- Department
of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, Indiana 46032, United States
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20
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Manandhar B, Ahn JM. Glucagon-like peptide-1 (GLP-1) analogs: recent advances, new possibilities, and therapeutic implications. J Med Chem 2014; 58:1020-37. [PMID: 25349901 PMCID: PMC4329993 DOI: 10.1021/jm500810s] [Citation(s) in RCA: 108] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
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Glucagon-like peptide-1 (GLP-1) is
an incretin that plays important
physiological roles in glucose homeostasis. Produced from intestine
upon food intake, it stimulates insulin secretion and keeps pancreatic
β-cells healthy and proliferating. Because of these beneficial
effects, it has attracted a great deal of attention in the past decade,
and an entirely new line of diabetic therapeutics has emerged based
on the peptide. In addition to the therapeutic applications, GLP-1
analogs have demonstrated a potential in molecular imaging of pancreatic β-cells;
this may be useful in early detection of the disease and evaluation
of therapeutic interventions, including islet transplantation. In
this Perspective, we focus on GLP-1 analogs for their studies on improvement
of biological activities, enhancement of metabolic stability, investigation
of receptor interaction, and visualization of the pancreatic islets.
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Affiliation(s)
- Bikash Manandhar
- Department of Chemistry, University of Texas at Dallas , Richardson, Texas 75080, United States
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21
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Akram ON, DeGraff DJ, Sheehan JH, Tilley WD, Matusik RJ, Ahn JM, Raj GV. Tailoring Peptidomimetics for Targeting Protein–Protein Interactions. Mol Cancer Res 2014; 12:967-78. [DOI: 10.1158/1541-7786.mcr-13-0611] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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22
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Peptidomimetic targeting of critical androgen receptor-coregulator interactions in prostate cancer. Nat Commun 2013; 4:1923. [PMID: 23715282 DOI: 10.1038/ncomms2912] [Citation(s) in RCA: 113] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Accepted: 04/18/2013] [Indexed: 01/27/2023] Open
Abstract
The growth of advanced prostate cancer depends on androgen receptor signalling, however treatment options are limited. Here we report the disruption of specific protein-protein interactions involving LXXLL motifs in androgen receptor-coregulator proteins such as PELP1 using a novel, small molecule peptidomimetic (D2). D2 is stable, non-toxic and efficiently taken up by prostate cancer cells. Importantly, D2 blocks androgen-induced nuclear uptake and genomic activity of the androgen receptor. Furthermore, D2 abrogates androgen-induced proliferation of prostate cancer cells in vitro with an IC50 of 40 nM, and inhibits tumour growth in a mouse xenograft model. D2 also disrupts androgen receptor-coregulator interactions in ex vivo cultures of primary human prostate tumours. These findings provide evidence that targeting androgen receptor-coregulator interactions using peptidomimetics may be a viable therapeutic approach for patients with advanced prostate cancer.
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23
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Recapitulating the α-helix: nonpeptidic, low-molecular-weight ligands for the modulation of helix-mediated protein–protein interactions. Future Med Chem 2013; 5:2157-74. [DOI: 10.4155/fmc.13.176] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Protein–protein interactions play critical roles in a wide variety of biological processes, and their dysregulations contribute to the pathogenesis of several diseases, including cancer. Chemical entities that can abrogate aberrant protein–protein interactions may provide novel therapeutic agents. A large number of protein–protein interactions are mediated by protein secondary structure, the most commonly encountered form of which is the α-helix. Accordingly, over the last decade, there has been a flood of nonpeptidic small molecules that recapitulate the projection and chemical nature of key side chains of the canonical α-helix as a strategy to disrupt helix-mediated protein–protein interactions. In this review, we discuss recent advances (post 2006) in the design of synthetic α-helix mimetics, which include single-faced and two-faced/amphipathic structures, for the modulation of protein–protein interactions.
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24
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Sharma S, Rajale T, Cordes DB, Hung-Low F, Birney DM. Experimental and Computational Studies on the [3,3]- and [3,5]-Sigmatropic Rearrangements of Acetoxycyclohexadienones: A Non-ionic Mechanism for Acyl Migration. J Am Chem Soc 2013; 135:14438-47. [DOI: 10.1021/ja4077364] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shikha Sharma
- Department of Chemistry and
Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, United States
| | - Trideep Rajale
- Department of Chemistry and
Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, United States
| | - David B. Cordes
- Department of Chemistry and
Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, United States
| | - Fernando Hung-Low
- Department of Chemistry and
Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, United States
| | - David M. Birney
- Department of Chemistry and
Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, United States
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25
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Kulikov OV, Thompson S, Xu H, Incarvito CD, Scott RTW, Saraogi I, Nevola L, Hamilton AD. Design and Synthesis of Oligoamide-Based Double α-Helix Mimetics. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300363] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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26
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Murphy NS, Prabhakaran P, Azzarito V, Plante JP, Hardie MJ, Kilner CA, Warriner SL, Wilson AJ. Solid-phase methodology for synthesis of O-alkylated aromatic oligoamide inhibitors of α-helix-mediated protein-protein interactions. Chemistry 2013; 19:5546-50. [PMID: 23508712 PMCID: PMC3743211 DOI: 10.1002/chem.201204098] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Indexed: 01/18/2023]
Abstract
Rapid access to rigid rods: A method is described for the synthesis of 3-O-alkylated aromatic oligobenzamide foldamers that could be used for assembly of libraries of α-helix mimetic inhibitors of protein-protein interactions (see scheme; Fmoc=9-fluorenylmethoxycarbonyl).
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Affiliation(s)
- Natasha S Murphy
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK
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27
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Peters M, Trobe M, Tan H, Kleineweischede R, Breinbauer R. A modular synthesis of teraryl-based α-helix mimetics, part 1: Synthesis of core fragments with two electronically differentiated leaving groups. Chemistry 2013; 19:2442-9. [PMID: 23292813 DOI: 10.1002/chem.201203005] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Revised: 11/12/2012] [Indexed: 01/12/2023]
Abstract
Teraryl-based α-helix mimetics have proven to be useful compounds for the inhibition of protein-protein interactions (PPI). We have developed a modular and flexible approach for the synthesis of teraryl-based α-helix mimetics. Central to our strategy is the use of a benzene core unit featuring two leaving groups of differentiated reactivity in the Pd-catalyzed cross-coupling used for terphenyl assembly. With the halogen/diazonium route and the halogen/triflate route, two strategies have successfully been established. The synthesis of core building blocks with aliphatic (Ala, Val, Leu, Ile), aromatic (Phe), polar (Cys, Lys), hydrophilic (Ser, Gln), and acidic (Glu) amino acid side chains are reported.
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Affiliation(s)
- Martin Peters
- Institute of Organic Chemistry, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
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28
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Whitby LR, Boger DL. Comprehensive peptidomimetic libraries targeting protein-protein interactions. Acc Chem Res 2012; 45:1698-709. [PMID: 22799570 DOI: 10.1021/ar300025n] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Transient protein-protein interactions (PPIs) are essential components in cellular signaling pathways as well as in important processes such as viral infection, replication, and immune suppression. The unknown or uncharacterized PPIs involved in such interaction networks often represent compelling therapeutic targets for drug discovery. To date, however, the main strategies for discovery of small molecule modulators of PPIs are typically limited to structurally characterized targets. Recent developments in molecular scaffolds that mimic the side chain display of peptide secondary structures have yielded effective designs, but few screening libraries of such mimetics are available to interrogate PPI targets. We initiated a program to prepare a comprehensive small molecule library designed to mimic the three major recognition motifs that mediate PPIs (α-helix, β-turn, and β-strand). Three libraries would be built around templates designed to mimic each such secondary structure and substituted with all triplet combinations of groups representing the 20 natural amino acid side chains. When combined, the three libraries would contain a member capable of mimicking the key interaction and recognition residues of most targetable PPIs. In this Account, we summarize the results of the design, synthesis, and validation of an 8000 member α-helix mimetic library and a 4200 member β-turn mimetic library. We expect that the screening of these libraries will not only provide lead structures against α-helix- or β-turn-mediated protein-protein or peptide-receptor interactions, even if the nature of the interaction is unknown, but also yield key insights into the recognition motif (α-helix or β-turn) and identify the key residues mediating the interaction. Consistent with this expectation, the screening of the libraries against p53/MDM2 and HIV-1 gp41 (α-helix mimetic library) or the opioid receptors (β-turn mimetic library) led to the discovery of library members expected to mimic the known endogenous ligands. These efforts led to the discovery of high-affinity α-helix mimetics (K(i) = 0.7 μM) against HIV-1 gp41 as well as high-affinity and selective β-turn mimetics (K(i) = 80 nM) against the κ-opioid receptor. The results suggest that the use of such comprehensive libraries of peptide secondary structure mimetics, built around effective molecular scaffolds, constitutes a powerful method of interrogating PPIs. These structures provide small molecule modulators of PPI networks for therapeutic target validation, lead compound discovery, and the identification of modulators of biological processes for further study.
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Affiliation(s)
- Landon R. Whitby
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Dale L. Boger
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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29
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Zhang DW, Zhao X, Hou JL, Li ZT. Aromatic Amide Foldamers: Structures, Properties, and Functions. Chem Rev 2012; 112:5271-316. [PMID: 22871167 DOI: 10.1021/cr300116k] [Citation(s) in RCA: 509] [Impact Index Per Article: 42.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Dan-Wei Zhang
- Department of Chemistry, Fudan
University, 220 Handan Road, Shanghai 200433, China
| | - Xin Zhao
- Shanghai Institute of Organic
Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai
200032, China
| | - Jun-Li Hou
- Department of Chemistry, Fudan
University, 220 Handan Road, Shanghai 200433, China
| | - Zhan-Ting Li
- Department of Chemistry, Fudan
University, 220 Handan Road, Shanghai 200433, China
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30
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Azzarito V, Prabhakaran P, Bartlett AI, Murphy NS, Hardie MJ, Kilner CA, Edwards TA, Warriner SL, Wilson AJ. 2-O-alkylated para-benzamide α-helix mimetics: the role of scaffold curvature. Org Biomol Chem 2012; 10:6469-72. [PMID: 22785578 DOI: 10.1039/c2ob26262b] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The design and synthesis of a new 2-O-alklyated benzamide α-helix mimetic is described. Comparison with regioisomeric 3-O-alkylated benzamides permits a preliminary evaluation of the role that mimetic curvature has in determining molecular recognition properties.
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Affiliation(s)
- Valeria Azzarito
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, United Kingdom
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31
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Kulikov OV, Hamilton AD. Synthesis of the novel trimeric benzamides—potential inhibitors of protein–protein interactions. RSC Adv 2012. [DOI: 10.1039/c2ra01153k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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32
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Whitby LR, Ando Y, Setola V, Vogt PK, Roth BL, Boger DL. Design, synthesis, and validation of a β-turn mimetic library targeting protein-protein and peptide-receptor interactions. J Am Chem Soc 2011; 133:10184-94. [PMID: 21609016 DOI: 10.1021/ja201878v] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The design and synthesis of a β-turn mimetic library as a key component of a small-molecule library targeting the major recognition motifs involved in protein-protein interactions is described. Analysis of a geometric characterization of 10,245 β-turns in the protein data bank (PDB) suggested that trans-pyrrolidine-3,4-dicarboxamide could serve as an effective and synthetically accessible library template. This was confirmed by initially screening select compounds against a series of peptide-activated GPCRs that recognize a β-turn structure in their endogenous ligands. This validation study was highlighted by identification of both nonbasic and basic small molecules with high affinities (K(i) = 390 and 23 nM, respectively) for the κ-opioid receptor (KOR). Consistent with the screening capabilities of collaborators and following the design validation, the complete library was assembled as 210 mixtures of 20 compounds, providing a total of 4200 compounds designed to mimic all possible permutations of 3 of the 4 residues in a naturally occurring β-turn. Unique to the design and because of the C(2) symmetry of the template, a typical 20 × 20 × 20-mix (8000 compounds prepared as 400 mixtures of 20 compounds) needed to represent 20 variations in the side chains of three amino acid residues reduces to a 210 × 20-mix, thereby simplifying the library synthesis and subsequent screening. The library was prepared using a solution-phase synthetic protocol with liquid-liquid or liquid-solid extractions for purification and conducted on a scale that insures its long-term availability for screening campaigns. Screening the library against the human opioid receptors (KOR, MOR, and DOR) identified not only the activity of library members expected to mimic the opioid receptor peptide ligands but also additional side-chain combinations that provided enhanced receptor binding selectivities (>100-fold) and affinities (as low as K(i) = 80 nM for KOR). A key insight to emerge from the studies is that the phenol of Tyr in endogenous ligands bearing the H-Tyr-Pro-Trp/Phe-Phe-NH(2) β-turn is important for MOR binding but may not be important for KOR (accommodated, but not preferred) and that the resulting selectivity for KOR observed with its removal can be increased by replacing the phenol OH with a chlorine substituent, further enhancing KOR affinity.
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Affiliation(s)
- Landon R Whitby
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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