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Abstract
The prospect of recreating the complex structural hierarchy of protein folding in synthetic oligomers with backbones that are artificial in covalent structure ("foldamers") has long fascinated chemists. Foldamers offer complex functions from biostable scaffolds and have found widespread applications in fields from biomedical to materials science. Most precedent has focused on isolated secondary structures or their assemblies. In considering the goal of complex protein-like tertiary folding patterns, a key barrier became apparent. How does one design a backbone with covalent connectivity and a sequence of side-chain functional groups that will support defined intramolecular packing of multiple artificial secondary structures? Two developments were key to overcoming this challenge. First was the recognition of the power of blending α-amino acid residues with monomers differing in backbone connectivity to create "heterogeneous-backbone" foldamers. Second was the finding that replacing some of the natural α-residues in a biological sequence with artificial-backbone variants can result in a mimic that retains both the fold and function of the native sequence and, in some cases, gains advantageous characteristics. Taken together, these precedents lead to a view of a protein as chemical entity having two orthogonal sequences: a sequence of side-chain functional groups and a separate sequence of backbone units displaying those functional groups. In this Account, we describe our lab's work over the last ∼10 years to leverage the above concept of protein sequence duality in order to develop design principles for constructing heterogeneous-backbone foldamers that adopt complex protein-like tertiary folds. Fundamental to the approach is the utilization of a variety of artificial building blocks (e.g., d-α-residues, Cα-Me-α-residues, N-Me-α-residues, β-residues, γ-residues, δ-residues, polymer segments) in concert, replacing a fraction of α-residues in a given prototype sequence. We provide an overview of the state-of-the-art in terms of design principles for choosing substitutions based on consideration of local secondary structure and retention of key side-chain functional groups. We survey high-resolution structures of backbone-modified proteins to illustrate how diverse artificial moieties are accommodated in tertiary fold contexts. We detail efforts to elucidate how backbone alteration impacts folding thermodynamics and describe how such data informs the development of improved design rules. Collectively, a growing body of results by our lab and others spanning multiple protein systems suggests there is a great deal of plasticity with respect to the backbone chemical structures upon which sequence-encoded tertiary folds can manifest. Moreover, these efforts suggest sequence-guided backbone alteration as a broadly applicable strategy for generating foldamers with complex tertiary folding patterns. We conclude by offering some perspective regarding the near future of this field, in terms of unanswered questions, technological needs, and opportunities for new areas of inquiry.
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Affiliation(s)
- Kelly L. George
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - W. Seth Horne
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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52
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Jiang Y, Deng Q, Zhao H, Xie M, Chen L, Yin F, Qin X, Zheng W, Zhao Y, Li Z. Development of Stabilized Peptide-Based PROTACs against Estrogen Receptor α. ACS Chem Biol 2018; 13:628-635. [PMID: 29271628 DOI: 10.1021/acschembio.7b00985] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Peptide modulators targeting protein-protein interactions (PPIs) exhibit greater potential than small-molecule drugs in several important aspects including facile modification and relative large contact surface area. Stabilized peptides constructed by variable chemistry methods exhibit improved peptide stability and cell permeability compared to that of the linears. Herein, we designed a stabilized peptide-based proteolysis-targeting chimera (PROTAC) targeting estrogen receptor α (ERα) by tethering an N-terminal aspartic acid cross-linked stabilized peptide ERα modulator (TD-PERM) with a pentapeptide that binds the Von Hippel-Lindau (VHL) E3 ubiquitin ligase complex. The resulting heterobifunctional peptide (TD-PROTAC) selectively recruits ERα to the VHL E3 ligase complex, leading to the degradation of ERα in a proteasome-dependent manner. Compared with the control peptides, TD-PROTAC shows significantly enhanced activities in reducing the transcription of the ERα-downstream genes and inhibiting the proliferation of ERα-positive breast cancer cells. In addition, in vivo experiments indicate that TD-PROTAC leads to tumor regression in the MCF-7 mouse xenograft model. This work is a successful attempt to construct PROTACs based on cell-permeable stabilized peptides, which significantly broadens the chemical space of PROTACs and stabilized peptides.
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Affiliation(s)
- Yanhong Jiang
- Key Lab of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Qiwen Deng
- Key Lab of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Hui Zhao
- Division of Life Sciences, Clarivate Analytics, Beijing, 100190, China
| | - Mingsheng Xie
- Key Lab of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Longjian Chen
- Key Lab of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Feng Yin
- Key Lab of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Xuan Qin
- Key Lab of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Weihao Zheng
- Key Lab of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Yongjuan Zhao
- Key Lab of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Zigang Li
- Key Lab of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
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53
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Jang G, Lee M, Lee J, Shim J, Kang P, Choi MG, Choi SH. Cooperative Effect of the Two Hydrogen Bonding Types on 11/9-Helical Folding of α/β-Peptides. B KOREAN CHEM SOC 2018. [DOI: 10.1002/bkcs.11376] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Geunhyuk Jang
- Department of Chemistry; Yonsei University; Seoul 03722 South Korea
| | - Mihye Lee
- Department of Chemistry; Yonsei University; Seoul 03722 South Korea
| | - Jaeyeon Lee
- Department of Chemistry; Yonsei University; Seoul 03722 South Korea
| | - Jihyun Shim
- Department of Chemistry; Yonsei University; Seoul 03722 South Korea
| | - Philjae Kang
- Department of Chemistry; Yonsei University; Seoul 03722 South Korea
| | - Moon-Gun Choi
- Department of Chemistry; Yonsei University; Seoul 03722 South Korea
| | - Soo Hyuk Choi
- Department of Chemistry; Yonsei University; Seoul 03722 South Korea
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54
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Lee J, Shim J, Kang P, Choi MG, Choi SH. Side chain-specific 11/9-helix propensity of α/β-peptides with alternating residue types. Org Biomol Chem 2018; 16:433-438. [DOI: 10.1039/c7ob02816d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The 11/9-helix propensity of α/β-peptides is dependent on a specific side chain group of α- or β3-residue.
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Affiliation(s)
- Jaeyeon Lee
- Department of Chemistry
- Yonsei University
- Seoul
- Republic of Korea
| | - Jihyun Shim
- Department of Chemistry
- Yonsei University
- Seoul
- Republic of Korea
| | - Philjae Kang
- Department of Chemistry
- Yonsei University
- Seoul
- Republic of Korea
| | - Moon-Gun Choi
- Department of Chemistry
- Yonsei University
- Seoul
- Republic of Korea
| | - Soo Hyuk Choi
- Department of Chemistry
- Yonsei University
- Seoul
- Republic of Korea
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55
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Kracker O, Góra J, Krzciuk-Gula J, Marion A, Neumann B, Stammler HG, Nieß A, Antes I, Latajka R, Sewald N. 1,5-Disubstituted 1,2,3-Triazole-Containing Peptidotriazolamers: Design Principles for a Class of Versatile Peptidomimetics. Chemistry 2017; 24:953-961. [PMID: 29160605 DOI: 10.1002/chem.201704583] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Indexed: 12/24/2022]
Abstract
Peptidotriazolamers are hybrid foldamers combining features of peptides and triazolamers-repetitive peptidomimetic structures with triazoles replacing peptide bonds. We report on the synthesis of a new class of peptidomimetics, containing 1,5-disubstituted 1,2,3-triazoles in an alternating fashion with amide bonds and the analysis of their conformation in solid state and solution. Homo- or heterochiral peptidotriazolamers were obtained from enantiomerically pure propargylamines with stereogenic centers in the propargylic position and α-azido esters by ruthenium-catalyzed azide-alkyne cycloaddition (RuAAC) under microwave conditions in high yields. With such building blocks the peptidotriazolamers are readily available by solution phase synthesis. While the conformation of the homochiral peptidotriazolamer Boc-Ala[5Tz]Phe-Val[5Tz]Ala-Leu[5Tz]Val-OBzl resembles that of a β VIa1 turn, the heterochiral peptidotriazolamer Boc-d-Ala[5Tz]Phe-d-Val[5Tz]Ala-d-Leu[5Tz]Val-OBzl adopts a polyproline-like repetitive structure.
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Affiliation(s)
- Oliver Kracker
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, PO Box 100131, 33501, Bielefeld, Germany
| | - Jerzy Góra
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, PO Box 100131, 33501, Bielefeld, Germany.,Department of Bioorganic Chemistry, Wrocław University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370, Wrocław, Poland
| | - Joanna Krzciuk-Gula
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, PO Box 100131, 33501, Bielefeld, Germany.,Department of Bioorganic Chemistry, Wrocław University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370, Wrocław, Poland
| | - Antoine Marion
- Center for Integrated Protein Science, Department of Biosciences, TU Munich, Emil-Erlenmeyer-Forum 8, 85354, Freising, Germany
| | - Beate Neumann
- Inorganic and Structural Chemistry, Department of Chemistry, Bielefeld University, PO Box 100131, 33501, Bielefeld, Germany
| | - Hans-Georg Stammler
- Inorganic and Structural Chemistry, Department of Chemistry, Bielefeld University, PO Box 100131, 33501, Bielefeld, Germany
| | - Anke Nieß
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, PO Box 100131, 33501, Bielefeld, Germany
| | - Iris Antes
- Center for Integrated Protein Science, Department of Biosciences, TU Munich, Emil-Erlenmeyer-Forum 8, 85354, Freising, Germany
| | - Rafał Latajka
- Department of Bioorganic Chemistry, Wrocław University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370, Wrocław, Poland
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, PO Box 100131, 33501, Bielefeld, Germany
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56
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Misawa T, Kanda Y, Demizu Y. Rational Design and Synthesis of Post-Functionalizable Peptide Foldamers as Helical Templates. Bioconjug Chem 2017; 28:3029-3035. [DOI: 10.1021/acs.bioconjchem.7b00621] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Takashi Misawa
- Division of Organic Chemistry and ‡Division of Pharmacology, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Yasunari Kanda
- Division of Organic Chemistry and ‡Division of Pharmacology, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Yosuke Demizu
- Division of Organic Chemistry and ‡Division of Pharmacology, National Institute of Health Sciences, Tokyo 158-8501, Japan
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57
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Cheloha RW, Chen B, Kumar NN, Watanabe T, Thorne RG, Li L, Gardella TJ, Gellman SH. Development of Potent, Protease-Resistant Agonists of the Parathyroid Hormone Receptor with Broad β Residue Distribution. J Med Chem 2017; 60:8816-8833. [PMID: 29064243 DOI: 10.1021/acs.jmedchem.7b00876] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The parathyroid hormone receptor 1 (PTHR1) is a member of the B-family of GPCRs; these receptors are activated by long polypeptide hormones and constitute targets of drug development efforts. Parathyroid hormone (PTH, 84 residues) and PTH-related protein (PTHrP, 141 residues) are natural agonists of PTHR1, and an N-terminal fragment of PTH, PTH(1-34), is used clinically to treat osteoporosis. Conventional peptides in the 20-40-mer length range are rapidly degraded by proteases, which may limit their biomedical utility. We have used the PTHR1-ligand system to explore the impact of broadly distributed replacement of α-amino acid residues with β-amino acid residues on susceptibility to proteolysis and agonist activity. This effort led us to identify new PTHR1 agonists that contain α → β replacements throughout their sequences, manifest potent agonist activity in cellular assays, and display remarkable resistance to proteolysis, in cases remaining active after extended exposure to simulated gastric fluid. The strategy we have employed suggests a path toward identifying protease-resistant agonists of other B-family GPCRs.
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Affiliation(s)
- Ross W Cheloha
- Department of Chemistry, University of Wisconsin-Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Bingming Chen
- School of Pharmacy, University of Wisconsin-Madison , 777 Highland Avenue, Madison, Wisconsin 53705, United States
| | - Niyanta N Kumar
- School of Pharmacy, University of Wisconsin-Madison , 777 Highland Avenue, Madison, Wisconsin 53705, United States
| | - Tomoyuki Watanabe
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School , Boston, Massachusetts 02114, United States
| | - Robert G Thorne
- School of Pharmacy, University of Wisconsin-Madison , 777 Highland Avenue, Madison, Wisconsin 53705, United States.,Clinical Neuroengineering Training Program, University of Wisconsin-Madison Biomedical Engineering , Engineering Centers Building, Room 2120, 1550 Engineering Drive, Madison Wisconsin 53706, United States.,Neuroscience Training Program & Center for Neuroscience, Wisconsin Institutes for Medical Research II , Rooms 9531 and 9533, 1111 Highland Avenue, Madison, Wisconsin 53705, United States.,Cellular and Molecular Pathology Graduate Training Program, UW Department of Pathology and Laboratory Medicine, University of Wisconsin-Madison , 1685 Highland Avenue, Madison, Wisconsin 53705, United States
| | - Lingjun Li
- Department of Chemistry, University of Wisconsin-Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States.,School of Pharmacy, University of Wisconsin-Madison , 777 Highland Avenue, Madison, Wisconsin 53705, United States
| | - Thomas J Gardella
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School , Boston, Massachusetts 02114, United States
| | - Samuel H Gellman
- Department of Chemistry, University of Wisconsin-Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States
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58
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Hogeweg A, Sowislok A, Schrader T, Beuck C. Eine NMR-Methode zur Bestimmung der Bindungsreihenfolge supramolekularer Liganden an basische Reste in Proteinen. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201707950] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Anna Hogeweg
- Bayer Pharma AG; Aprather Weg 18a 42096 Wuppertal Deutschland
| | - Andrea Sowislok
- Universität Duisburg-Essen; Organische Chemie; Universitätsstraße 2-5 45144 Essen Deutschland
| | - Thomas Schrader
- Universität Duisburg-Essen; Organische Chemie; Universitätsstraße 2-5 45144 Essen Deutschland
| | - Christine Beuck
- Universität Duisburg-Essen; Strukturelle und Medizinische Biochemie; Universitätsstraße 2-5 45144 Essen Deutschland
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59
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Hogeweg A, Sowislok A, Schrader T, Beuck C. An NMR Method To Pinpoint Supramolecular Ligand Binding to Basic Residues on Proteins. Angew Chem Int Ed Engl 2017; 56:14758-14762. [PMID: 28877391 DOI: 10.1002/anie.201707950] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Indexed: 01/14/2023]
Abstract
Targeting protein surfaces involved in protein-protein interactions by using supramolecular chemistry is a rapidly growing field. NMR spectroscopy is the method of choice to map ligand-binding sites with single-residue resolution by amide chemical shift perturbation and line broadening. However, large aromatic ligands affect NMR signals over a greater distance, and the binding site cannot be determined unambiguously by relying on backbone signals only. We herein employed Lys- and Arg-specific H2(C)N NMR experiments to directly observe the side-chain atoms in close contact with the ligand, for which the largest changes in the NMR signals are expected. The binding of Lys- and Arg-specific supramolecular tweezers and a calixarene to two model proteins was studied. The H2(C)N spectra track the terminal CH2 groups of all Lys and Arg residues, revealing significant differences in their binding kinetics and chemical shift perturbation, and can be used to clearly pinpoint the order of ligand binding.
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Affiliation(s)
- Anna Hogeweg
- Current address: Bayer Pharma AG, Aprather Weg 18a, 42096, Wuppertal, Germany
| | - Andrea Sowislok
- University of Duisburg-Essen, Organic Chemistry, Universitätsstrasse 2-5, 45144, Essen, Germany
| | - Thomas Schrader
- University of Duisburg-Essen, Organic Chemistry, Universitätsstrasse 2-5, 45144, Essen, Germany
| | - Christine Beuck
- University of Duisburg-Essen, Structural and Medicinal Biochemistry, Universitätsstrasse 2-5, 45144, Essen, Germany
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60
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Fisher BF, Hong SH, Gellman SH. Helix Propensities of Amino Acid Residues via Thioester Exchange. J Am Chem Soc 2017; 139:13292-13295. [PMID: 28898059 PMCID: PMC5995559 DOI: 10.1021/jacs.7b07930] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We describe the use of thioester exchange equilibria to measure the propensities of amino acid residues to participate in helical secondary structure at room temperature in the absence of denaturants. Thermally or chemically induced unfolding has previously been employed to measure α-helix propensities among proteinogenic α-amino acid residues, and quantitative comparison with precedents indicates that the thioester exchange system is reliable for residues that lack side chain charge. This system allows the measurement of α-helix propensities for d-α-amino acid residues and propensities of residues with nonproteinogenic backbones, such as those derived from a β-amino acid, to participate in an α-helix-like secondary structure.
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Affiliation(s)
- Brian F. Fisher
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Seong Ho Hong
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Samuel H. Gellman
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
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61
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Klein M. Stabilized helical peptides: overview of the technologies and its impact on drug discovery. Expert Opin Drug Discov 2017; 12:1117-1125. [PMID: 28889766 DOI: 10.1080/17460441.2017.1372745] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
INTRODUCTION Protein-protein interactions are predominant in the workings of all cells. Until now, there have been a few successes in targeting protein-protein interactions with small molecules. Peptides may overcome some of the challenges of small molecules in disrupting protein-protein interactions. However, peptides present a new set of challenges in drug discovery. Thus, the study of the stabilization of helical peptides has been extensive. Areas covered: Several technological approaches to helical peptide stabilization have been studied. In this review, stapled peptides, foldamers, and hydrogen bond surrogates are discussed. Issues regarding design principles are also discussed. Furthermore, this review introduces select computational techniques used to aid peptide design and discusses clinical trials of peptides in a more advanced stage of development. Expert opinion: Stabilized helical peptides hold great promise in a wide array of diseases. However, the field is still relatively new and new design principles are emerging. The possibilities of peptide modification are quite extensive and expanding, so the design of stabilized peptides requires great attention to detail in order to avoid a large number of failed lead peptides. The start of clinical trials with stapled peptides is a promising sign for the future.
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Affiliation(s)
- Mark Klein
- a Division of Hematology, Oncology, and Transplantation , University of Minnesota , Minneapolis , MN , USA.,b Hematology/Oncology Section , Minneapolis VA Healthcare System , Minneapolis , MN , USA
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62
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Bécart D, Diemer V, Salaün A, Oiarbide M, Nelli YR, Kauffmann B, Fischer L, Palomo C, Guichard G. Helical Oligourea Foldamers as Powerful Hydrogen Bonding Catalysts for Enantioselective C–C Bond-Forming Reactions. J Am Chem Soc 2017; 139:12524-12532. [DOI: 10.1021/jacs.7b05802] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Diane Bécart
- Univ.
Bordeaux, CNRS, CBMN, UMR 5248, Institut Européen de Chimie et Biologie, 2 rue Robert Escarpit, F-33607 Pessac, France
- Departamento
de Química Orgánica I, Facultad de Químicas, Universidad del País Vasco UPV/EHU, Apdo. 1072, 20080 San Sebastián, Spain
| | - Vincent Diemer
- Univ.
Bordeaux, CNRS, CBMN, UMR 5248, Institut Européen de Chimie et Biologie, 2 rue Robert Escarpit, F-33607 Pessac, France
| | - Arnaud Salaün
- Univ.
Bordeaux, CNRS, CBMN, UMR 5248, Institut Européen de Chimie et Biologie, 2 rue Robert Escarpit, F-33607 Pessac, France
| | - Mikel Oiarbide
- Departamento
de Química Orgánica I, Facultad de Químicas, Universidad del País Vasco UPV/EHU, Apdo. 1072, 20080 San Sebastián, Spain
| | - Yella Reddy Nelli
- Univ.
Bordeaux, CNRS, CBMN, UMR 5248, Institut Européen de Chimie et Biologie, 2 rue Robert Escarpit, F-33607 Pessac, France
| | - Brice Kauffmann
- Univ.
Bordeaux, CNRS, INSERM, UMS3033/US001, Institut Européen de Chimie et Biologie, F-33607 Pessac, France
| | - Lucile Fischer
- Univ.
Bordeaux, CNRS, CBMN, UMR 5248, Institut Européen de Chimie et Biologie, 2 rue Robert Escarpit, F-33607 Pessac, France
| | - Claudio Palomo
- Departamento
de Química Orgánica I, Facultad de Químicas, Universidad del País Vasco UPV/EHU, Apdo. 1072, 20080 San Sebastián, Spain
| | - Gilles Guichard
- Univ.
Bordeaux, CNRS, CBMN, UMR 5248, Institut Européen de Chimie et Biologie, 2 rue Robert Escarpit, F-33607 Pessac, France
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63
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Tennyson RL, Walker SN, Ikeda T, Harris RS, McNaughton BR. Evaluation of sequence variability in HIV-1 gp41 C-peptide helix-grafted proteins. Bioorg Med Chem 2017; 26:1220-1224. [PMID: 28811070 DOI: 10.1016/j.bmc.2017.07.064] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2017] [Revised: 07/24/2017] [Accepted: 07/31/2017] [Indexed: 12/11/2022]
Abstract
Many therapeutically-relevant protein-protein interactions (PPIs) have been reported that feature a helix and helix-binding cleft at the interface. Given this, different approaches to disrupting such PPIs have been developed. While short peptides (<15 amino acids) typically do not fold into a stable helix, researchers have reported chemical approaches to constraining helix structure. However, these approaches rely on laborious, and often expensive, chemical synthesis and purification. Our premise is that protein-based solutions that stabilize a therapeutically-relevant helix offer a number of advantages. In contrast to chemically constrained helical peptides, or minimal/miniature proteins, which must be synthesized (at great expense and labor), a protein can be expressed in a cellular system (like all current protein therapeutics). If selected properly, the protein scaffold can stabilize the therapeutically-relevant helix. We recently reported a protein engineering strategy, which we call "helix-grafted display", and applied it to the challenge of suppressing HIV entry. We have reported helix-grafted display proteins that inhibit formation of an intramolecular PPI involving HIV gp41 C-peptide helix, and HIV gp41 N-peptide trimer, which contain C-peptide helix-binding clefts. Here, we used yeast display to screen a library of grafted C-peptide helices for N-peptide trimer recognition. Using 'hits' from yeast display library screening, we evaluated the effect helix mutations have on structure, expression, stability, function (target recognition), and suppression of HIV entry.
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Affiliation(s)
- Rachel L Tennyson
- Department of Chemistry, Colorado State University, Fort Collins, CO, USA
| | - Susanne N Walker
- Department of Chemistry, Colorado State University, Fort Collins, CO, USA
| | - Terumasa Ikeda
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, USA; Howard Hughes Medical Institute, University of Minnesota, Minneapolis, MN, USA
| | - Reuben S Harris
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, USA; Howard Hughes Medical Institute, University of Minnesota, Minneapolis, MN, USA
| | - Brian R McNaughton
- Department of Chemistry, Colorado State University, Fort Collins, CO, USA; Department of Biochemistry & Molecular Biology, Colorado State University, Fort Collins, CO, USA.
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64
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Misawa T, Imamura M, Ozawa Y, Haishima K, Kurihara M, Kikuchi Y, Demizu Y. Development of helix-stabilized antimicrobial peptides composed of lysine and hydrophobic α,α-disubstituted α-amino acid residues. Bioorg Med Chem Lett 2017; 27:3950-3953. [PMID: 28789896 DOI: 10.1016/j.bmcl.2017.07.074] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 07/25/2017] [Accepted: 07/28/2017] [Indexed: 01/14/2023]
Abstract
Lysine-based amphipathic nonapeptides, including homochiral peptides [Ac-(l-Lys-l-Lys-Xaa)3-NH2 (Xaa=Gly, Ala, Aib, Ac5c, or Ac6c) and Ac-(d-Lys-d-Lys-Aib)3-NH2], a heterochiral peptide [Ac-(l-Lys-d-Lys-Aib)3-NH2], and a racemic mixture of diastereomeric peptides [Ac-(rac-Lys-rac-Lys-Aib)3-NH2] were designed and synthesized to investigate the relationship between their preferred secondary structures and their antimicrobial activity. Peptide 5, [Ac-(l-Lys-l-Lys-Ac6c)3-NH2] formed a stable α-helical structure and exhibited strong activity against Gram-negative bacteria (Escherichia coli and Pseudomonas aeruginosa).
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Affiliation(s)
- Takashi Misawa
- National Institute of Health Sciences, 1-18-1, Kamiyoga, Setagaya, Tokyo 158-8501, Japan
| | - Mitsuyoshi Imamura
- National Institute of Health Sciences, 1-18-1, Kamiyoga, Setagaya, Tokyo 158-8501, Japan
| | - Yuto Ozawa
- National Institute of Health Sciences, 1-18-1, Kamiyoga, Setagaya, Tokyo 158-8501, Japan
| | - Kazuchika Haishima
- National Institute of Health Sciences, 1-18-1, Kamiyoga, Setagaya, Tokyo 158-8501, Japan
| | - Masaaki Kurihara
- National Institute of Health Sciences, 1-18-1, Kamiyoga, Setagaya, Tokyo 158-8501, Japan
| | - Yutaka Kikuchi
- National Institute of Health Sciences, 1-18-1, Kamiyoga, Setagaya, Tokyo 158-8501, Japan.
| | - Yosuke Demizu
- National Institute of Health Sciences, 1-18-1, Kamiyoga, Setagaya, Tokyo 158-8501, Japan.
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65
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George KL, Horne WS. Heterogeneous-Backbone Foldamer Mimics of Zinc Finger Tertiary Structure. J Am Chem Soc 2017; 139:7931-7938. [PMID: 28509549 DOI: 10.1021/jacs.7b03114] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A variety of oligomeric backbones with compositions deviating from biomacromolecules can fold in defined ways. Termed "foldamers," these agents have diverse potential applications. A number of protein-inspired secondary structures (e.g., helices, sheets) have been produced from unnatural backbones, yet examples of tertiary folds combining several secondary structural elements in a single entity are rare. One promising strategy to address this challenge is the systematic backbone alteration of natural protein sequences, through which a subset of the native side chains is displayed on an unnatural building block to generate a heterogeneous backbone. A drawback to this approach is that substitution at more than one or two sites often comes at a significant energetic cost to fold stability. Here we report heterogeneous-backbone foldamers that mimic the zinc finger domain, a ubiquitous and biologically important metal-binding tertiary motif, and do so with a folded stability that is superior to the natural protein on which their design is based. A combination of UV-vis spectroscopy, isothermal titration calorimetry, and multidimensional NMR reveals that suitably designed oligomers with >20% modified backbones can form native-like tertiary folds with metal-binding environments identical to the prototype sequence (the third finger of specificity factor 1) and enhanced thermodynamic stability. These results expand the scope of heterogeneous-backbone foldamer design to a new tertiary structure class and show that judiciously applied backbone modification can be accompanied by improvement to fold stability.
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Affiliation(s)
- Kelly L George
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
| | - W Seth Horne
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
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66
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Zhang DW, Wang H, Li ZT. Polymeric Tubular Aromatic Amide Helices. Macromol Rapid Commun 2017; 38. [DOI: 10.1002/marc.201700179] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 04/10/2017] [Indexed: 12/15/2022]
Affiliation(s)
- Dan-Wei Zhang
- Department of Chemistry; Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials; Collaborative Innovation Center of Chemistry for Energy Materials (iChEM); Fudan University; Shanghai 200433 China
| | - Hui Wang
- Department of Chemistry; Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials; Collaborative Innovation Center of Chemistry for Energy Materials (iChEM); Fudan University; Shanghai 200433 China
| | - Zhan-Ting Li
- Department of Chemistry; Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials; Collaborative Innovation Center of Chemistry for Energy Materials (iChEM); Fudan University; Shanghai 200433 China
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67
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Menyhárd DK, Hudáky I, Jákli I, Juhász G, Perczel A. Predictable Conformational Diversity in Foldamers of Sugar Amino Acids. J Chem Inf Model 2017; 57:757-768. [PMID: 28345931 DOI: 10.1021/acs.jcim.6b00488] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A systematic conformational search was carried out for monomers and homohexamers of furanoid β-amino acids: cis-(S,R) and trans-(S,S) stereoisomers of aminocyclopentane carboxylic acid (ACPC), two different aminofuranuronic acids (AFUα and AFUβ), their isopropylidene derivatives (AFU(ip)), and the key intermediate β-aminotetrahydrofurancarboxylic acid (ATFC). The stereochemistry of the building blocks was chosen to match that of the natural sugar amino acid (xylose and ribose) precursors (XylAFU and RibAFU). The results show that hexamers of cis-furanoid β-amino acids show great variability: while hydrophobic cyclopentane (cis-ACPC)6 and hydrophilic (XylAFUα/β)6 foldamers favor two different zigzagged conformation as hexamers, the backbone fold turns into a helix in the case of (cis-ATFC)6 (10-helix) and (XylAFU(ip))6 (14-helix). Trans stereochemistry resulted in hexamers exclusively with the right-handed helix conformation, (H12P)6, regardless of their polarity. We found that the preferred oligomeric structure of XylAFUα/β is conformationally compatible with β-pleated sheets, while that of the trans/(S,S) units matches with α-helices of proteins.
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Affiliation(s)
- Dóra K Menyhárd
- Laboratory of Structural Chemistry and Biology, Institute of Chemistry, Eötvös Loránd University , Pázmány P. stny. 1/A, 1117 Budapest, Hungary.,MTA-ELTE Protein Modeling Research Group, Pázmány P. sétány. 1/A, 1117 Budapest, Hungary
| | - Ilona Hudáky
- Laboratory of Structural Chemistry and Biology, Institute of Chemistry, Eötvös Loránd University , Pázmány P. stny. 1/A, 1117 Budapest, Hungary
| | - Imre Jákli
- Laboratory of Structural Chemistry and Biology, Institute of Chemistry, Eötvös Loránd University , Pázmány P. stny. 1/A, 1117 Budapest, Hungary.,MTA-ELTE Protein Modeling Research Group, Pázmány P. sétány. 1/A, 1117 Budapest, Hungary
| | - György Juhász
- Department of Chemistry, Faculty of Education, J. Selye University , Bratislavská 3322, Komárno, Slovakia
| | - András Perczel
- Laboratory of Structural Chemistry and Biology, Institute of Chemistry, Eötvös Loránd University , Pázmány P. stny. 1/A, 1117 Budapest, Hungary.,MTA-ELTE Protein Modeling Research Group, Pázmány P. sétány. 1/A, 1117 Budapest, Hungary
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68
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Bartus É, Hegedüs Z, Wéber E, Csipak B, Szakonyi G, Martinek TA. De Novo Modular Development of a Foldameric Protein-Protein Interaction Inhibitor for Separate Hot Spots: A Dynamic Covalent Assembly Approach. ChemistryOpen 2017; 6:236-241. [PMID: 28413758 PMCID: PMC5390796 DOI: 10.1002/open.201700012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Indexed: 01/27/2023] Open
Abstract
Protein-protein interactions stabilized by multiple separate hot spots are highly challenging targets for synthetic scaffolds. Surface-mimetic foldamers bearing multiple recognition segments are promising candidate inhibitors. In this work, a modular bottom-up approach is implemented by identifying short foldameric recognition segments that interact with the independent hot spots, and connecting them through dynamic covalent library (DCL) optimization. The independent hot spots of a model target (calmodulin) are mapped with hexameric β-peptide helices using a pull-down assay. Recognition segment hits are subjected to a target-templated DCL ligation through thiol-disulfide exchange. The most potent derivative displays low nanomolar affinity towards calmodulin and effectively inhibits the calmodulin-TRPV1 interaction. The DCL assembly of the folded segments offers an efficient approach towards the de novo development of a high-affinity inhibitor of protein-protein interactions.
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Affiliation(s)
- Éva Bartus
- Institute of Pharmaceutical Analysis, SZTE-MTA Lendület Foldamer Research GroupUniversity of Szeged4 Somogyi Str.6720SzegedHungary
| | - Zsófia Hegedüs
- Institute of Pharmaceutical Analysis, SZTE-MTA Lendület Foldamer Research GroupUniversity of Szeged4 Somogyi Str.6720SzegedHungary
| | - Edit Wéber
- Institute of Pharmaceutical Analysis, SZTE-MTA Lendület Foldamer Research GroupUniversity of Szeged4 Somogyi Str.6720SzegedHungary
| | - Brigitta Csipak
- Institute of Pharmaceutical Analysis, SZTE-MTA Lendület Foldamer Research GroupUniversity of Szeged4 Somogyi Str.6720SzegedHungary
| | - Gerda Szakonyi
- Institute of Pharmaceutical Analysis, SZTE-MTA Lendület Foldamer Research GroupUniversity of Szeged4 Somogyi Str.6720SzegedHungary
| | - Tamás A. Martinek
- Institute of Pharmaceutical Analysis, SZTE-MTA Lendület Foldamer Research GroupUniversity of Szeged4 Somogyi Str.6720SzegedHungary
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69
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Characterization of signal bias at the GLP-1 receptor induced by backbone modification of GLP-1. Biochem Pharmacol 2017; 136:99-108. [PMID: 28363772 DOI: 10.1016/j.bcp.2017.03.018] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2017] [Accepted: 03/27/2017] [Indexed: 12/23/2022]
Abstract
The glucagon-like peptide-1 receptor (GLP-1R) is a class B G protein-coupled receptor that is a major therapeutic target for the treatment of type 2 diabetes. Activation of this receptor promotes insulin secretion and blood glucose regulation. The GLP-1R can initiate signaling through several intracellular pathways upon activation by GLP-1. GLP-1R ligands that preferentially stimulate subsets among the natural signaling pathways ("biased agonists") could be useful as tools for elucidating the consequences of specific pathways and might engender therapeutic agents with tailored effects. Using HEK-293 cells recombinantly expressing human GLP-1R, we have previously reported that backbone modification of GLP-1, via replacement of selected α-amino acid residues with β-amino acid residues, generates GLP-1 analogues with distinctive preferences for promoting G protein activation versus β-arrestin recruitment. Here, we have explored the influence of cell background across these two parameters and expanded our analysis to include affinity and other key signaling pathways (intracellular calcium mobilization and ERK phosphorylation) using recombinant human GLP-1R expressed in a CHO cell background, which has been used extensively to demonstrate biased agonism of GLP-1R ligands. The new data indicate that α/β-peptide analogues of GLP-1 exhibit a range of distinct bias profiles relative to GLP-1 and that broad assessment of signaling endpoints is required to reveal the spectrum of behavior of modified peptides. These results support the view that backbone modification via α→β amino acid replacement can enable rapid discovery of peptide hormone analogues that display substantial signal bias at a cognate GPCR.
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70
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Goel R, Sharma AK, Gupta A. Self-assembled amphiphilic mixed α/β-tetrapeptoid nanostructures as promising drug delivery vehicles. NEW J CHEM 2017. [DOI: 10.1039/c6nj03281h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Tetrapeptoid nanostructures have been prepared and their potential used for delivering hydrophobic drug molecules.
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Affiliation(s)
- Rahul Goel
- Department of Chemistry
- Dyal Singh College
- University of Delhi
- New Delhi-110003
- India
| | - Ashwani Kumar Sharma
- NAR Laboratory
- CSIR-Institute of Genomics and Integrative Biology
- Delhi-110007
- India
| | - Alka Gupta
- Department of Chemistry
- Dyal Singh College
- University of Delhi
- New Delhi-110003
- India
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71
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Lee J, Jang G, Kang P, Choi MG, Choi SH. Helical α/β-depsipeptides with alternating residue types: conformational change from the 11-helix to the 14/15-helix. Org Biomol Chem 2016; 14:8438-42. [DOI: 10.1039/c6ob01602b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Short α/β-depsipeptides of which the third residue from the N-terminus is an (S)-lactic acid residue predominantly adopt 14/15-helical conformations analogous to the α-helix.
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Affiliation(s)
- Jaeyeon Lee
- Department of Chemistry
- Yonsei University
- Seoul
- Republic of Korea
| | - Geunhyeok Jang
- Department of Chemistry
- Yonsei University
- Seoul
- Republic of Korea
| | - Philjae Kang
- Department of Chemistry
- Yonsei University
- Seoul
- Republic of Korea
| | - Moon-Gun Choi
- Department of Chemistry
- Yonsei University
- Seoul
- Republic of Korea
| | - Soo Hyuk Choi
- Department of Chemistry
- Yonsei University
- Seoul
- Republic of Korea
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