1
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Ding Y, Pedersen SS, Wang Y, Xiao H, Ball ZT. Ex Situ Gaseous Reagent for Multicomponent Amine Bioconjugation. Org Lett 2024. [PMID: 39072587 DOI: 10.1021/acs.orglett.4c02246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2024]
Abstract
We report a minimalist gaseous sulfonyl-chloride-derived reagent for multicomponent bioconjugation with amine, phenol, or aniline reagents to afford urea or carbamate products. With the utilization of a gas-phase reagent for a reaction mediated by metal ions, a variety of biologically relevant molecules, such as saccharide, poly(ethylene glycol), fluorophore, and affinity tag, can be efficiently cross-linked to the N terminus or lysine side-chain amines on natural polypeptides or proteins.
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Affiliation(s)
- Yuxuan Ding
- Department of Chemistry, Rice University, Houston, Texas 77005, United States
| | - Simon S Pedersen
- Department of Chemistry, Rice University, Houston, Texas 77005, United States
- Carbon Dioxide Activation Center (CADIAC), Interdisciplinary Nanoscience Center, Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C, Denmark
| | - Yixian Wang
- Department of Chemistry, Rice University, Houston, Texas 77005, United States
| | - Han Xiao
- Department of Chemistry, Rice University, Houston, Texas 77005, United States
| | - Zachary T Ball
- Department of Chemistry, Rice University, Houston, Texas 77005, United States
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2
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Ding Y, Pedersen SS, Wang H, Xiang B, Wang Y, Yang Z, Gao Y, Morosan E, Jones MR, Xiao H, Ball ZT. Selective Macrocyclization of Unprotected Peptides with an Ex Situ Gaseous Linchpin Reagent. Angew Chem Int Ed Engl 2024; 63:e202405344. [PMID: 38753429 DOI: 10.1002/anie.202405344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2024] [Indexed: 07/16/2024]
Abstract
Peptide cyclization has dramatic effects on a variety of important properties, enhancing metabolic stability, limiting conformational flexibility, and altering cellular entry and intracellular localization. The hydrophilic, polyfunctional nature of peptides creates chemoselectivity challenges in macrocyclization, especially for natural sequences without biorthogonal handles. Herein, we describe a gaseous sulfonyl chloride derived reagent that achieves amine-amine, amine-phenol, and amine-aniline crosslinking through a minimalist linchpin strategy that affords macrocyclic urea or carbamate products. The cyclization reaction is metal-mediated and involves a novel application of sulfine species that remains unexplored in aqueous or biological contexts. The aqueous method delivers unique cyclic or bicyclic topologies directly from a variety of natural bioactive peptides without the need for protecting-group strategies.
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Affiliation(s)
- Yuxuan Ding
- Department of Chemistry, Rice University, Houston, Texas, 77005, United States
| | - Simon S Pedersen
- Department of Chemistry, Rice University, Houston, Texas, 77005, United States
- Carbon Dioxide Activation Center (CADIAC), Interdisciplinary Nanoscience Center, Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, 8000, Aarhus C, Denmark
| | - Haofan Wang
- Department of Chemistry, Rice University, Houston, Texas, 77005, United States
| | - Baorui Xiang
- Department of Chemistry, Rice University, Houston, Texas, 77005, United States
| | - Yixian Wang
- Department of Chemistry, Rice University, Houston, Texas, 77005, United States
| | - Zhi Yang
- Department of Chemistry, Rice University, Houston, Texas, 77005, United States
| | - Yuxiang Gao
- Department of Physics and Astronomy, Rice University, Houston, Texas, 77005, United States
| | - Emilia Morosan
- Department of Chemistry, Rice University, Houston, Texas, 77005, United States
- Department of Physics and Astronomy, Rice University, Houston, Texas, 77005, United States
| | - Matthew R Jones
- Department of Chemistry, Rice University, Houston, Texas, 77005, United States
| | - Han Xiao
- Department of Chemistry, Rice University, Houston, Texas, 77005, United States
| | - Zachary T Ball
- Department of Chemistry, Rice University, Houston, Texas, 77005, United States
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3
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Werner M, Brinkhofer J, Hammermüller L, Heim T, Pham TL, Huber J, Klein C, Thomas F. Peptide Boronic Acids by Late-Stage Hydroboration on the Solid Phase. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2400640. [PMID: 38810019 PMCID: PMC11267286 DOI: 10.1002/advs.202400640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2024] [Revised: 05/15/2024] [Indexed: 05/31/2024]
Abstract
Organoboron compounds have a wide range of applications in numerous research fields, and methods to incorporate them in biomolecules are much sought after. Here, on-resin chemical syntheses of aliphatic and vinylogous peptide boronic acids are presented by transition metal-catalyzed late-stage hydroboration of alkene and alkyne groups in peptides and peptoids, for example on allyl- and propargylglycine residues, using readily available chemicals. These methods yield peptide boronic acids with much shorter linkers than previously reported on-resin methods. Furthermore, the methods are regio- and stereoselective, compatible with all canonical amino acid residues and can be applied to short, long, and in part even "difficult" peptide sequences. In a feasibility study, the protected peptide vinylboronic acids are further derivatized by the Petasis reaction using salicylaldehyde derivatives. The ability of the obtained peptide boronic acids to reversibly bind to carbohydrates is demonstrated in a catch-release model experiment using a fluorescently labeled peptide boronic acid on cross-linked dextran beads. In summary, this highlights the potential of the target compounds for drug discovery, glycan-specific target recognition, controlled release, and diagnostics.
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Affiliation(s)
- Marius Werner
- Institute of Organic ChemistryHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
- Medicinal ChemistryInstitute of Pharmacy and Molecular Biotechnology (IPMB)Heidelberg UniversityIm Neuenheimer Feld 36469120HeidelbergGermany
| | - Julian Brinkhofer
- Institute of Organic ChemistryHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Leon Hammermüller
- Institute of Organic ChemistryHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Thomas Heim
- Institute of Organic ChemistryHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Truc Lam Pham
- Institute of Organic ChemistryHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Jonas Huber
- Institute of Organic ChemistryHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Christian Klein
- Medicinal ChemistryInstitute of Pharmacy and Molecular Biotechnology (IPMB)Heidelberg UniversityIm Neuenheimer Feld 36469120HeidelbergGermany
| | - Franziska Thomas
- Institute of Organic ChemistryHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
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4
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Hayashi J, Kobayashi D, Namikawa C, Denda M, Otaka A. Synthesis of N-Glyoxylyl Peptides Enabled by a Lossen Rearrangement-Induced Intramolecular Redox Reaction of N-Terminal Glycyl Hydroxamic Acid. Org Lett 2024; 26:4246-4250. [PMID: 38738629 DOI: 10.1021/acs.orglett.4c01126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/14/2024]
Abstract
An oxidant-free approach to the synthesis of N-glyoxylyl peptides has been developed that utilizes the Lossen rearrangement of the N-terminal glycyl hydroxamic acid residue. The synthesis proceeds via an intramolecular redox mechanism to yield the glyoxylyl peptides, which are then subjected to various peptide cyclization procedures. The reaction scheme is suitable for oxidation-sensitive moieties including amino acids.
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Affiliation(s)
- Junya Hayashi
- Institute of Biomedical Sciences and Graduate School of Pharmaceutical Sciences, Tokushima University, Tokushima 770-8505, Japan
| | - Daishiro Kobayashi
- Institute of Biomedical Sciences and Graduate School of Pharmaceutical Sciences, Tokushima University, Tokushima 770-8505, Japan
| | - Chizuru Namikawa
- Faculty of Pharmaceutical Sciences, Tokushima University, Tokushima 770-8505, Japan
| | - Masaya Denda
- Institute of Biomedical Sciences and Graduate School of Pharmaceutical Sciences, Tokushima University, Tokushima 770-8505, Japan
| | - Akira Otaka
- Institute of Biomedical Sciences and Graduate School of Pharmaceutical Sciences, Tokushima University, Tokushima 770-8505, Japan
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5
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Krajcovicova S. Ideas Behind the Tryptophan-Mediated Petasis Reaction (TMPR) Concept for Peptide Stapling. ChemMedChem 2024:e202400148. [PMID: 38726738 DOI: 10.1002/cmdc.202400148] [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: 02/23/2024] [Revised: 05/09/2024] [Indexed: 07/22/2024]
Abstract
This Concept short review offers an insightful analysis of pivotal research papers and explores the key synthetic ideas behind the intersection of two realms in peptide chemistry: using tryptophan and Petasis multicomponent reactions for macrocyclisation and labelling of peptides. The recently published tryptophan-mediated Petasis reaction (TMPR) concept represents a critical junction between these two worlds, highlighting how combining such methodologies leads to more effective and versatile synthetic strategies, setting a potentially new direction for future research in the field of peptide-drug conjugates.
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Affiliation(s)
- Sona Krajcovicova
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, United Kingdom
- Department of Organic Chemistry, Faculty of Science, Palacky University in Olomouc, Tr. 17. Listopadu 12, 77900, Olomouc, Czech Republic
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6
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Todorovic M, Blanc A, Wang Z, Lozada J, Froelich J, Zeisler J, Zhang C, Merkens H, Benard F, Perrin DM. 5-Hydroxypyrroloindoline Affords Tryptathionine and 2,2'-bis-Indole Peptide Staples: Application to Melanotan-II. Chemistry 2024; 30:e202304270. [PMID: 38285527 DOI: 10.1002/chem.202304270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 01/29/2024] [Accepted: 01/29/2024] [Indexed: 01/31/2024]
Abstract
With peptides increasingly favored as drugs, natural product motifs, namely the tryptathionine staple, found in amatoxins and phallotoxins, and the 2,2'-bis-indole found in staurosporine represent unexplored staples for unnatural peptide macrocycles. We disclose the efficient condensation of a 5-hydroxypyrroloindoline with either a cysteine-thiol or a tryptophan-indole to form a tryptathionine or 2-2'-bis-indole staple. Judicious use of protecting groups provides for chemoselective stapling using α-MSH, which provides a basis for investigating both chemoselectivity and affinity. Both classes of stapled peptides show nanomolar Ki's, with one showing a sub-nanomolar Ki value.
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Affiliation(s)
- Mihajlo Todorovic
- Chemistry Department, University of British Columbia, 2036 Main Mall, V6T 1Z1, Vancouver, BC, Canada
| | - Antoine Blanc
- Chemistry Department, University of British Columbia, 2036 Main Mall, V6T 1Z1, Vancouver, BC, Canada
| | - Zhou Wang
- Chemistry Department, University of British Columbia, 2036 Main Mall, V6T 1Z1, Vancouver, BC, Canada
| | - Jerome Lozada
- Chemistry Department, University of British Columbia, 2036 Main Mall, V6T 1Z1, Vancouver, BC, Canada
| | - Juliette Froelich
- Chemistry Department, University of British Columbia, 2036 Main Mall, V6T 1Z1, Vancouver, BC, Canada
| | - Jutta Zeisler
- Department of Molecular Oncology, BC Cancer Agency, 675 West 10th Avenue, V5Z 1 L3, Vancouver, BC, Canada
| | - Chengcheng Zhang
- Department of Molecular Oncology, BC Cancer Agency, 675 West 10th Avenue, V5Z 1 L3, Vancouver, BC, Canada
| | - Helen Merkens
- Department of Molecular Oncology, BC Cancer Agency, 675 West 10th Avenue, V5Z 1 L3, Vancouver, BC, Canada
| | - Francois Benard
- Department of Molecular Oncology, BC Cancer Agency, 675 West 10th Avenue, V5Z 1 L3, Vancouver, BC, Canada
| | - David M Perrin
- Chemistry Department, University of British Columbia, 2036 Main Mall, V6T 1Z1, Vancouver, BC, Canada
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7
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Gao F, Chang M, Meng X, Xu H, Gnawali G, Dong Y, Lopez B, Wang W. Site-Selective Modification of Secondary Amine Moieties on Native Peptides, Proteins, and Natural Products with Ynones. Bioconjug Chem 2023; 34:1553-1562. [PMID: 37646420 DOI: 10.1021/acs.bioconjchem.3c00246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Site-selective modification of biologically relevant secondary amines in peptides, proteins, and natural products has been challenging due to the similar reactivity between primary and secondary amines. Even for the secondary amines, their reactivities are significantly influenced by their structures and environment. Herein, we report a ynone Michael bioconjugation method for selective modification of secondary amines in unprotected peptides and proteins and complex natural products. We show that fine tuning the electronic effect of the ynones enables controlling the Michael acceptor reactivity for the selective reaction with the structurally different secondary amines in densely functionalized complex structures and complicated biological environment.
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Affiliation(s)
- Feng Gao
- Department of Pharmacology and Toxicology, R. Ken Coit College of Pharmacy, University of Arizona, 1703 E Mabel Street, Tucson, Arizona 85721, United States
| | - Mengyang Chang
- Department of Chemistry and Biochemistry, University of Arizona, 1306 E University Blvd., Tucson, Arizona 85721, United States
| | - Xiang Meng
- Department of Pharmacology and Toxicology, R. Ken Coit College of Pharmacy, University of Arizona, 1703 E Mabel Street, Tucson, Arizona 85721, United States
| | - Hang Xu
- Department of Pharmacology and Toxicology, R. Ken Coit College of Pharmacy, University of Arizona, 1703 E Mabel Street, Tucson, Arizona 85721, United States
| | - Giri Gnawali
- Department of Pharmacology and Toxicology, R. Ken Coit College of Pharmacy, University of Arizona, 1703 E Mabel Street, Tucson, Arizona 85721, United States
| | - Yue Dong
- Department of Pharmacology and Toxicology, R. Ken Coit College of Pharmacy, University of Arizona, 1703 E Mabel Street, Tucson, Arizona 85721, United States
| | - Byrdie Lopez
- Department of Chemistry and Biochemistry, University of Arizona, 1306 E University Blvd., Tucson, Arizona 85721, United States
| | - Wei Wang
- Department of Pharmacology and Toxicology, R. Ken Coit College of Pharmacy, University of Arizona, 1703 E Mabel Street, Tucson, Arizona 85721, United States
- Department of Chemistry and Biochemistry, University of Arizona, 1306 E University Blvd., Tucson, Arizona 85721, United States
- University of Arizona Cancer Center, University of Arizona, 3838 N. Campbell Avenue, Tucson, Arizona 85719, United States
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8
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Krajcovicova S, Spring DR. Tryptophan in Multicomponent Petasis Reactions for Peptide Stapling and Late-Stage Functionalisation. Angew Chem Int Ed Engl 2023; 62:e202307782. [PMID: 37389988 DOI: 10.1002/anie.202307782] [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] [Received: 06/02/2023] [Revised: 06/26/2023] [Accepted: 06/30/2023] [Indexed: 07/02/2023]
Abstract
Peptide stapling is a robust strategy for generating enzymatically stable, macrocyclic peptides. The incorporation of biologically relevant tags (such as cell-penetrating motifs or fluorescent dyes) into peptides, while preserving their binding interactions and enhancing their stability, is highly sought after. Despite the unique opportunities offered by tryptophan's indole scaffold for targeted functionalisation, its utilisation in peptide stapling has been limited as compared to other amino acids. Herein, we present an approach for peptide stapling using the tryptophan-mediated Petasis reaction. This method enables the synthesis of both stapled and labelled peptides and is applicable to both solution and solid-phase synthesis. Importantly, the use of the Petasis reaction in combination with tryptophan facilitates the formation of stapled peptides in a straightforward, multicomponent fashion, while circumventing the formation of undesired by-products. Furthermore, this approach allows for efficient and diverse late-stage peptide modifications, thereby enabling rapid production of numerous conjugates for biological and medicinal applications.
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Affiliation(s)
- Sona Krajcovicova
- Department of Chemistry, University of Cambridge, Lensfield road, CB2 1EW, Cambridge, UK
- Department of Organic Chemistry, Palacky University Olomouc, Tr. 17. Listopadu 12, 77900, Olomouc, Czech Republic
| | - David R Spring
- Department of Chemistry, University of Cambridge, Lensfield road, CB2 1EW, Cambridge, UK
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9
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Walther R, Westermann LM, Carmali S, Jackson SE, Brötz-Oesterhelt H, Spring DR. Identification of macrocyclic peptides which activate bacterial cylindrical proteases. RSC Med Chem 2023; 14:1186-1191. [PMID: 37360394 PMCID: PMC10285738 DOI: 10.1039/d3md00136a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 05/15/2023] [Indexed: 06/28/2023] Open
Abstract
The caseinolytic protease complex ClpXP is an important house-keeping enzyme in prokaryotes charged with the removal and degradation of misfolded and aggregated proteins and performing regulatory proteolysis. Dysregulation of its function, particularly by inhibition or allosteric activation of the proteolytic core ClpP, has proven to be a promising strategy to reduce virulence and eradicate persistent bacterial infections. Here, we report a rational drug-design approach to identify macrocyclic peptides which increase proteolysis by ClpP. This work expands the understanding of ClpP dynamics and sheds light on the conformational control exerted by its binding partner, the chaperone ClpX, by means of a chemical approach. The identified macrocyclic peptide ligands may, in the future, serve as a starting point for the development of ClpP activators for antibacterial applications.
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Affiliation(s)
- Raoul Walther
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road CB2 1EW Cambridge UK
| | - Linda M Westermann
- Interfaculty Institute of Microbiology and Infection Medicine, Dept. of Bioactive Compounds, University of Tübingen Auf der Morgenstelle 28 72076 Tübingen Germany
| | - Sheiliza Carmali
- School of Pharmacy, Queen's University Belfast BT9 7BL Belfast UK
| | - Sophie E Jackson
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road CB2 1EW Cambridge UK
| | - Heike Brötz-Oesterhelt
- Interfaculty Institute of Microbiology and Infection Medicine, Dept. of Bioactive Compounds, University of Tübingen Auf der Morgenstelle 28 72076 Tübingen Germany
- Cluster of Excellence Controlling Microbes to Fight Infections Germany
| | - David R Spring
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road CB2 1EW Cambridge UK
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10
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Huang KH, Morato NM, Feng Y, Cooks RG. High-Throughput Diversification of Complex Bioactive Molecules by Accelerated Synthesis in Microdroplets. Angew Chem Int Ed Engl 2023; 62:e202300956. [PMID: 36941213 PMCID: PMC10182919 DOI: 10.1002/anie.202300956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 03/17/2023] [Accepted: 03/20/2023] [Indexed: 03/23/2023]
Abstract
Late-stage diversification of drug molecules is an important strategy in drug discovery that can be facilitated by reaction screening using high-throughput experimentation. Here we present a rapid method for functionalizing bioactive molecules based on accelerated reactions in microdroplets. Reaction mixtures are nebulized at throughputs better than 1 reaction/second and the accelerated reactions occurring in the microdroplets are followed by desorption electrospray ionization mass spectrometry (DESI-MS). Because the accelerated reactions occur on the millisecond timescale, they allow an overall screening throughput of 1 Hz working at the low nanogram scale. Using this approach, an opioid agonist (PZM21) and an antagonist (naloxone) were diversified using three reactions important in medicinal chemistry: sulfur fluoride exchange (SuFEx) click reactions, imine formation reactions, and ene-type click reactions. Some 269 functionalized analogs of naloxone and PZM21 were generated and characterized by tandem mass spectrometry (MS/MS) after screening over 500 reactions.
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Affiliation(s)
- Kai-Hung Huang
- Department of Chemistry, Purdue University, West Lafayette, IN, USA
| | - Nicolás M Morato
- Department of Chemistry, Purdue University, West Lafayette, IN, USA
| | - Yunfei Feng
- Department of Chemistry, Purdue University, West Lafayette, IN, USA
| | - R Graham Cooks
- Department of Chemistry, Purdue University, West Lafayette, IN, USA
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11
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Chu X, Li B, Liu HY, Sun X, Yang X, He G, Zhou C, Xuan W, Liu SL, Chen G. Bioconjugation via Hetero-Selective Clamping of Two Different Amines with ortho-Phthalaldehyde. Angew Chem Int Ed Engl 2023; 62:e202212199. [PMID: 36398699 DOI: 10.1002/anie.202212199] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Indexed: 11/19/2022]
Abstract
Amino groups are common in both natural and synthetic compounds and offer a very attractive class of endogenous handles for bioconjugation. However, the ability to differentiate two types of amino groups and join them with high hetero-selectivity and efficiency in a complex setting remains elusive. Herein, we report a new method for bioconjugation via one-pot chemoselective clamping of two different amine nucleophiles using a simple ortho-phthalaldehyde (OPA) reagent. Various α-amino acids, aryl amines, and secondary amines can be crosslinked to the ϵ-amino side chain of lysine on peptides or proteins with high efficiency and hetero-selectivity. This method offers a simple and powerful means to crosslink small molecule drugs, imaging probes, peptides, proteins, carbohydrates, and even virus particles without any pre-functionalization.
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Affiliation(s)
- Xin Chu
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Bo Li
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Hao-Yang Liu
- State Key Laboratory of Medicinal Chemical Biology, College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Xiaowei Sun
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Xiaochen Yang
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Gang He
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Chuanzheng Zhou
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China.,Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, 300192, China
| | - Weimin Xuan
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Shu-Lin Liu
- State Key Laboratory of Medicinal Chemical Biology, College of Chemistry, Nankai University, Tianjin, 300071, China.,Frontiers Science Center for New Organic Matter, Nankai University, Tianjin, 300071, China
| | - Gong Chen
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China.,Frontiers Science Center for New Organic Matter, Nankai University, Tianjin, 300071, China.,Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, 300192, China
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12
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Werner M, Pampel J, Pham TL, Thomas F. Late‐Stage Functionalisation of Peptides on the Solid Phase by an Iodination‐Substitution Approach. Chemistry 2022; 28:e202201339. [PMID: 35700354 PMCID: PMC9545490 DOI: 10.1002/chem.202201339] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Indexed: 11/20/2022]
Abstract
The functionalisation of peptides at a late synthesis stage holds great potential, for example, for the synthesis of peptide pharmaceuticals, fluorescent biosensors or peptidomimetics. Here we describe an on‐resin iodination‐substitution reaction sequence on homoserine that is also suitable for peptide modification in a combinatorial format. The reaction sequence is accessible to a wide range of sulfur nucleophiles with various functional groups including boronic acids, hydroxy groups or aromatic amines. In this way, methionine‐like thioethers or thioesters and thiosulfonates are accessible. Next to sulfur nucleophiles, selenols, pyridines and carboxylic acids were successfully used as nucleophiles, whereas phenols did not react. The late‐stage iodination‐substitution approach is not only applicable to short peptides but also to the more complex 34‐amino‐acid WW domains. We applied this strategy to introduce 7‐mercapto‐4‐methylcoumarin into a switchable ZnII responsive WW domain to design an iFRET‐based ZnII sensor.
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Affiliation(s)
- Marius Werner
- Institute of Organic Chemistry Heidelberg University Im Neuenheimer Feld 270 69120 Heidelberg Germany
- Centre for Advanced Materials (CAM) Heidelberg University Im Neuenheimer Feld 225 69120 Heidelberg Germany
- Department of Medicinal Chemistry Institute of Pharmacy and Molecular Biotechnology (IPMB) Heidelberg University Im Neuenheimer Feld 364 69120 Heidelberg Germany
| | - Julius Pampel
- Department of Chemical Biology Max Planck Institute for Medical Research Jahnstraße 29 69120 Heidelberg Germany
| | - Truc Lam Pham
- Institute of Organic Chemistry Heidelberg University Im Neuenheimer Feld 270 69120 Heidelberg Germany
- Centre for Advanced Materials (CAM) Heidelberg University Im Neuenheimer Feld 225 69120 Heidelberg Germany
| | - Franziska Thomas
- Institute of Organic Chemistry Heidelberg University Im Neuenheimer Feld 270 69120 Heidelberg Germany
- Centre for Advanced Materials (CAM) Heidelberg University Im Neuenheimer Feld 225 69120 Heidelberg Germany
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13
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Vytla D, Emmadi J, Velayuthaperumal R, Shaw P, Cavallaro CL, Mathur A, Roy A. Visible-light enabled one-pot three-component Petasis reaction for synthesis of α-substituted secondary sulfonamides/amides/hydrazides. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.154055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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14
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Hussain H. Prof. Ludger Wessjohann: A Lifelong Career Dedicated to a Remarkable Service in "Natural Products Sciences". Int J Mol Sci 2022; 23:ijms23105440. [PMID: 35628250 PMCID: PMC9141945 DOI: 10.3390/ijms23105440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 04/28/2022] [Accepted: 05/07/2022] [Indexed: 11/16/2022] Open
Abstract
It is a great honor and a pleasure for me to serve as Guest Editor for this Issue of the "International Journal of Molecular Sciences", dedicated to our mentor and colleague, Professor Dr [...].
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Affiliation(s)
- Hidayat Hussain
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle, Germany
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15
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Nwajiobi O, Verma AK, Raj M. Rapid Arene Triazene Chemistry for Macrocyclization. J Am Chem Soc 2022; 144:4633-4641. [PMID: 35232021 DOI: 10.1021/jacs.2c00464] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Here, we report a novel rapid arene triazene strategy for the macrocyclization of peptides that generates an inbuilt chromophoric triazene moiety at the site of cyclization within a minute. The rapid arene triazene chemistry is chemoselective for secondary amines and p-amino phenylalanine. Importantly, the resulting triazene cyclic peptide is highly stable at neutral pH and under harsh conditions but rapidly responds to various external stimuli such as UV radiations and acidic conditions, resulting in the ring opening to generate the linear peptides in an unchanged form, which further cyclizes under neutral pH conditions. This method works with completely unprotected peptides and has been applied for the synthesis of 18- to 66-membered monocycles and bicycles with various amino acid compositions in one pot under neutral pH conditions. Due to the high stability of triazene cyclic peptides, the postcyclization modification was carried out with various functional groups. This rapid, macrocyclization strategy featuring a triazene scaffold, amenable to late-stage diversification and responsive to external stimuli, should find application in various fields of chemical biology, selective drug delivery, and identification of cyclic peptide hits after library screening.
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Affiliation(s)
- Ogonna Nwajiobi
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Ashish Kumar Verma
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Monika Raj
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
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16
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Gruß H, Feiner RC, Mseya R, Schröder DC, Jewgiński M, Müller KM, Latajka R, Marion A, Sewald N. Peptide stapling by late-stage Suzuki–Miyaura cross-coupling. Beilstein J Org Chem 2022; 18:1-12. [PMID: 35047078 PMCID: PMC8744458 DOI: 10.3762/bjoc.18.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 12/09/2021] [Indexed: 12/19/2022] Open
Abstract
The development of peptide stapling techniques to stabilise α-helical secondary structure motifs of peptides led to the design of modulators of protein–protein interactions, which had been considered undruggable for a long time. We disclose a novel approach towards peptide stapling utilising macrocyclisation by late-stage Suzuki–Miyaura cross-coupling of bromotryptophan-containing peptides of the catenin-binding domain of axin. Optimisation of the linker length in order to find a compromise between both sufficient linker rigidity and flexibility resulted in a peptide with an increased α-helicity and enhanced binding affinity to its native binding partner β-catenin. An increased proteolytic stability against proteinase K has been demonstrated.
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Affiliation(s)
- Hendrik Gruß
- Department of Chemistry, Bielefeld University, Universitätsstr. 25, 33615 Bielefeld, Germany
| | - Rebecca C Feiner
- Department of Technology, Bielefeld University, Universitätsstr. 25, 33615 Bielefeld, Germany
| | - Ridhiwan Mseya
- Department of Chemistry, Middle East Technical University, 06800, Ankara, Turkey
| | - David C Schröder
- Department of Chemistry, Bielefeld University, Universitätsstr. 25, 33615 Bielefeld, Germany
| | - Michał Jewgiński
- Department of Bioorganic Chemistry, Wrocław University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wrocław, Poland
| | - Kristian M Müller
- Department of Technology, Bielefeld University, Universitätsstr. 25, 33615 Bielefeld, Germany
| | - Rafał Latajka
- Department of Bioorganic Chemistry, Wrocław University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wrocław, Poland
| | - Antoine Marion
- Department of Chemistry, Middle East Technical University, 06800, Ankara, Turkey
| | - Norbert Sewald
- Department of Chemistry, Bielefeld University, Universitätsstr. 25, 33615 Bielefeld, Germany
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17
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Tan Y, Wu J, Song L, Zhang M, Hipolito CJ, Wu C, Wang S, Zhang Y, Yin Y. Merging the Versatile Functionalities of Boronic Acid with Peptides. Int J Mol Sci 2021; 22:ijms222312958. [PMID: 34884766 PMCID: PMC8657650 DOI: 10.3390/ijms222312958] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 11/23/2021] [Accepted: 11/24/2021] [Indexed: 11/16/2022] Open
Abstract
Peptides inherently feature the favorable properties of being easily synthesized, water-soluble, biocompatible, and typically non-toxic. Thus, boronic acid has been widely integrated with peptides with the goal of discovering peptide ligands with novel biological activities, and this effort has led to broad applications. Taking the integration between boronic acid and peptide as a starting point, we provide an overview of the latest research advances and highlight the versatile and robust functionalities of boronic acid. In this review, we summarize the diverse applications of peptide boronic acids in medicinal chemistry and chemical biology, including the identification of covalent reversible enzyme inhibitors, recognition, and detection of glycans on proteins or cancer cell surface, delivery of siRNAs, development of pH responsive devices, and recognition of RNA or bacterial surfaces. Additionally, we discuss boronic acid-mediated peptide cyclization and peptide modifications, as well as the facile chemical synthesis of peptide boronic acids, which paved the way for developing a growing number of peptide boronic acids.
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Affiliation(s)
- Yahong Tan
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao 266237, China; (Y.T.); (J.W.); (L.S.); (M.Z.); (C.W.); (Y.Z.)
| | - Junjie Wu
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao 266237, China; (Y.T.); (J.W.); (L.S.); (M.Z.); (C.W.); (Y.Z.)
| | - Lulu Song
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao 266237, China; (Y.T.); (J.W.); (L.S.); (M.Z.); (C.W.); (Y.Z.)
| | - Mengmeng Zhang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao 266237, China; (Y.T.); (J.W.); (L.S.); (M.Z.); (C.W.); (Y.Z.)
| | - Christopher John Hipolito
- Screening & Compound Profiling, Quantitative Biosciences, Merck & Co., Inc., Kenilworth, NJ 07033, USA;
| | - Changsheng Wu
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao 266237, China; (Y.T.); (J.W.); (L.S.); (M.Z.); (C.W.); (Y.Z.)
| | - Siyuan Wang
- Department of Medicinal Chemistry, College of Pharmacy, Shenzhen Technology University, Shenzhen 518118, China
- Correspondence: (S.W.); (Y.Y.)
| | - Youming Zhang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao 266237, China; (Y.T.); (J.W.); (L.S.); (M.Z.); (C.W.); (Y.Z.)
| | - Yizhen Yin
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao 266237, China; (Y.T.); (J.W.); (L.S.); (M.Z.); (C.W.); (Y.Z.)
- Correspondence: (S.W.); (Y.Y.)
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18
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Sabale PM, Imiołek M, Raia P, Barluenga S, Winssinger N. Suprastapled Peptides: Hybridization-Enhanced Peptide Ligation and Enforced α-Helical Conformation for Affinity Selection of Combinatorial Libraries. J Am Chem Soc 2021; 143:18932-18940. [PMID: 34739233 DOI: 10.1021/jacs.1c07013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Stapled peptides with an enforced α-helical conformation have been shown to overcome major limitations in the development of short peptides targeting protein-protein interactions (PPIs). While the growing arsenal of methodologies to staple peptides facilitates their preparation, stapling methodologies are not broadly embraced in synthetic library screening. Herein, we report a strategy leveraged on hybridization of short PNA-peptide conjugates wherein nucleobase driven assembly facilitates ligation of peptide fragments and constrains the peptide's conformation into an α-helix. Using native chemical ligation, we show that a mixture of peptide fragments can be combinatorially ligated and used directly in affinity selection against a target of interest. This approach was exemplified with a focused library targeting the p-53/MDM2 interaction. One hundred peptides were obtained in a one-pot ligation reaction, selected by affinity against MDM2 immobilized on beads, and the best binders were identified by mass spectrometry.
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Affiliation(s)
- Pramod M Sabale
- Faculty of Science, NCCR Chemical Biology, University of Geneva, 30 Quai Ernest Ansermet, CH-1205 Geneva, Switzerland
| | - Mateusz Imiołek
- Faculty of Science, NCCR Chemical Biology, University of Geneva, 30 Quai Ernest Ansermet, CH-1205 Geneva, Switzerland
| | - Pierre Raia
- Faculty of Science, NCCR Chemical Biology, University of Geneva, 30 Quai Ernest Ansermet, CH-1205 Geneva, Switzerland
| | - Sofia Barluenga
- Faculty of Science, NCCR Chemical Biology, University of Geneva, 30 Quai Ernest Ansermet, CH-1205 Geneva, Switzerland
| | - Nicolas Winssinger
- Faculty of Science, NCCR Chemical Biology, University of Geneva, 30 Quai Ernest Ansermet, CH-1205 Geneva, Switzerland
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19
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Ligation, Macrocyclization, and Simultaneous Functionalization of Peptides by Multicomponent Reactions (MCR). Methods Mol Biol 2021. [PMID: 34596847 DOI: 10.1007/978-1-0716-1689-5_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
Multicomponent reactions (MCRs) are recently expanding the plethora of solid-phase protocols for the synthesis and derivatization of peptides. Herein, we describe a solid-phase-compatible strategy based on MCRs as a powerful strategy for peptide cyclization and ligation . We illustrate, using Gramicidin S as a model peptide, how the execution of on-resin Ugi reactions enables the simultaneous backbone N-functionalization and cyclization, which are important types of derivatizations in peptide-based drug development or for incorporation of conjugation handles, or labels.
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20
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Wu Y, Chau H, Thor W, Chan KHY, Ma X, Chan W, Long NJ, Wong K. Solid-Phase Peptide Macrocyclization and Multifunctionalization via Dipyrrin Construction. Angew Chem Int Ed Engl 2021; 60:20301-20307. [PMID: 34272794 PMCID: PMC8457249 DOI: 10.1002/anie.202108885] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2021] [Indexed: 11/11/2022]
Abstract
We introduce a new and highly efficient synthetic protocol towards multifunctional fluorescent cyclopeptides by solid-phase peptide macrocyclization via dipyrrin construction, with full scope of proteinogenic amino acids and different ring sizes. Various bicyclic peptides can be created by dipyrrin-based crosslinking and double dipyrrin-ring formation. The embedded dipyrrin can be either transformed to fluorescent BODIPY and then utilized as cancer-selective targeted protein imaging probe in vitro, or directly employed as a selective metal sensor in aqueous media. This work provides a valuable addition to the peptide macrocyclization toolbox, and a blueprint for the development of multifunctional dipyrrin linkers in cyclopeptides for a wide range of potential bioapplications.
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Affiliation(s)
- Yue Wu
- Department of ChemistryHong Kong Baptist UniversityKowloon TongKowloonHong Kong SARChina
| | - Ho‐Fai Chau
- Department of ChemistryHong Kong Baptist UniversityKowloon TongKowloonHong Kong SARChina
| | - Waygen Thor
- Department of ChemistryHong Kong Baptist UniversityKowloon TongKowloonHong Kong SARChina
| | - Kaitlin Hao Yi Chan
- Department of ChemistryHong Kong Baptist UniversityKowloon TongKowloonHong Kong SARChina
- Department of Applied Biology and Chemical TechnologyHong Kong Polytechnic UniversityHung HomHong Kong SARChina
| | - Xia Ma
- Department of ChemistryHong Kong Baptist UniversityKowloon TongKowloonHong Kong SARChina
| | - Wai‐Lun Chan
- Department of Applied Biology and Chemical TechnologyHong Kong Polytechnic UniversityHung HomHong Kong SARChina
| | - Nicholas J. Long
- Department of ChemistryImperial College London, Molecular Sciences Research HubLondonUK
| | - Ka‐Leung Wong
- Department of ChemistryHong Kong Baptist UniversityKowloon TongKowloonHong Kong SARChina
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21
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Wu Y, Chau H, Thor W, Chan KHY, Ma X, Chan W, Long NJ, Wong K. Solid‐Phase Peptide Macrocyclization and Multifunctionalization via Dipyrrin Construction. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202108885] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Yue Wu
- Department of Chemistry Hong Kong Baptist University Kowloon Tong Kowloon Hong Kong SAR China
| | - Ho‐Fai Chau
- Department of Chemistry Hong Kong Baptist University Kowloon Tong Kowloon Hong Kong SAR China
| | - Waygen Thor
- Department of Chemistry Hong Kong Baptist University Kowloon Tong Kowloon Hong Kong SAR China
| | - Kaitlin Hao Yi Chan
- Department of Chemistry Hong Kong Baptist University Kowloon Tong Kowloon Hong Kong SAR China
- Department of Applied Biology and Chemical Technology Hong Kong Polytechnic University Hung Hom Hong Kong SAR China
| | - Xia Ma
- Department of Chemistry Hong Kong Baptist University Kowloon Tong Kowloon Hong Kong SAR China
| | - Wai‐Lun Chan
- Department of Applied Biology and Chemical Technology Hong Kong Polytechnic University Hung Hom Hong Kong SAR China
| | - Nicholas J. Long
- Department of Chemistry Imperial College London, Molecular Sciences Research Hub London UK
| | - Ka‐Leung Wong
- Department of Chemistry Hong Kong Baptist University Kowloon Tong Kowloon Hong Kong SAR China
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22
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Ghosh KG, Das D, Chandu P, Sureshkumar D. Visible‐Light Driven Organo‐photocatalyzed Multicomponent Reaction for C(
sp
3
)−H Alkylation of Phosphoramides with
in situ
Generated Michael Acceptors. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100561] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Krishna Gopal Ghosh
- Department of Chemical Sciences Indian Institute of Science Education and Research Kolkata Mohanpur 741246 West Bengal India
| | - Debabrata Das
- Department of Chemical Sciences Indian Institute of Science Education and Research Kolkata Mohanpur 741246 West Bengal India
| | - Palasetty Chandu
- Department of Chemical Sciences Indian Institute of Science Education and Research Kolkata Mohanpur 741246 West Bengal India
| | - Devarajulu Sureshkumar
- Department of Chemical Sciences Indian Institute of Science Education and Research Kolkata Mohanpur 741246 West Bengal India
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23
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Wang X, Zhu B, Dong J, Tian H, Liu Y, Song H, Wang Q. Visible-light-mediated multicomponent reaction for secondary amine synthesis. Chem Commun (Camb) 2021; 57:5028-5031. [PMID: 33881074 DOI: 10.1039/d1cc01560e] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The widespread presence of secondary amines in agrochemicals, pharmaceuticals, natural products, and small-molecule biological probes has inspired efforts to streamline the synthesis of molecules with this functional group. Herein, we report an operationally simple, mild protocol for the synthesis of secondary amines by three-component alkylation reactions of imines (generated in situ by condensation of benzaldehydes and anilines) with unactivated alkyl iodides catalyzed by inexpensive and readily available Mn2(CO)10. This protocol, which is compatible with a wide array of sensitive functional groups and does not require a large excess of the alkylating reagent, is a versatile, flexible tool for the synthesis of secondary amines.
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Affiliation(s)
- Xiaochen Wang
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
| | - Binbing Zhu
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
| | - Jianyang Dong
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
| | - Hao Tian
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
| | - Yuxiu Liu
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
| | - Hongjian Song
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
| | - Qingmin Wang
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China. and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, People's Republic of China
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24
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Ricardo MG, Vázquéz-Mena Y, Iglesias-Morales Y, Wessjohann LA, Rivera DG. On the scope of the double Ugi multicomponent stapling to produce helical peptides. Bioorg Chem 2021; 113:104987. [PMID: 34022444 DOI: 10.1016/j.bioorg.2021.104987] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 04/19/2021] [Accepted: 05/08/2021] [Indexed: 11/15/2022]
Abstract
The stabilization of helical structures by peptide stapling approaches is now a mature technology capable to provide a variety of biomedical applications. Recently, it was shown that multicomponent macrocyclization is not only an effective way to introduce conformational constraints but it also allows to incorporate additional functionalities to the staple moiety in a one-pot process. This work investigates the scope of the double Ugi multicomponent stapling approach in its capacity to produce helical peptides from unstructured sequences. For this, three different stapling combinations were implemented and the CD spectra of the cyclic peptides were measured to determine the effect of the multicomponent macrocyclization on the resulting secondary structure. A new insight into some structural factors influencing the helicity type and content is provided, along with new prospects on the utilization of this methodology to diversify the molecular tethers linking the amino acid side chains.
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Affiliation(s)
- Manuel G Ricardo
- Laboratory of Synthetic and Biomolecular Chemistry, Faculty of Chemistry, University of Havana, Zapata y G, Havana 10400, Cuba; Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany
| | - Yadiel Vázquéz-Mena
- Laboratory of Synthetic and Biomolecular Chemistry, Faculty of Chemistry, University of Havana, Zapata y G, Havana 10400, Cuba
| | - Yuleidys Iglesias-Morales
- Laboratory of Synthetic and Biomolecular Chemistry, Faculty of Chemistry, University of Havana, Zapata y G, Havana 10400, Cuba
| | - Ludger A Wessjohann
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany.
| | - Daniel G Rivera
- Laboratory of Synthetic and Biomolecular Chemistry, Faculty of Chemistry, University of Havana, Zapata y G, Havana 10400, Cuba; Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany.
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25
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Huang L, Xie Y, Ge P, Huang J, Feng H. Glyoxylic Acid: A Carboxyl Group‐Assisted Metal‐Free Decarboxylative Reaction Toward Propargylamines. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100383] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Liliang Huang
- College of Chemistry and Chemical Engineering Shanghai University of Engineering Science Shanghai 201620 China
| | - Yujuan Xie
- College of Chemistry and Chemical Engineering Shanghai University of Engineering Science Shanghai 201620 China
| | - Panyuan Ge
- College of Chemistry and Chemical Engineering Shanghai University of Engineering Science Shanghai 201620 China
| | - Junhai Huang
- China State Institute of Pharmaceutical Industry Shanghai Institute of Pharmaceutical Industry Shanghai 201203 China
| | - Huangdi Feng
- College of Chemistry and Chemical Engineering Shanghai University of Engineering Science Shanghai 201620 China
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26
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Ceballos J, Grinhagena E, Sangouard G, Heinis C, Waser J. Cys-Cys and Cys-Lys Stapling of Unprotected Peptides Enabled by Hypervalent Iodine Reagents. Angew Chem Int Ed Engl 2021; 60:9022-9031. [PMID: 33450121 PMCID: PMC8048981 DOI: 10.1002/anie.202014511] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 12/22/2020] [Indexed: 12/31/2022]
Abstract
Easy access to a wide range of structurally diverse stapled peptides is crucial for the development of inhibitors of protein-protein interactions. Herein, we report bis-functional hypervalent iodine reagents for two-component cysteine-cysteine and cysteine-lysine stapling yielding structurally diverse thioalkyne linkers. This stapling method works with unprotected natural amino acid residues and does not require pre-functionalization or metal catalysis. The products are stable to purification and isolation. Post-stapling modification can be accessed via amidation of an activated ester, or via cycloaddition onto the formed thioalkyne group. Increased helicity and binding affinity to MDM2 was obtained for a i,i+7 stapled peptide.
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Affiliation(s)
- Javier Ceballos
- Laboratory of Catalysis and Organic SynthesisEcole Polytechnique Fédérale de LausanneEPFL SB ISIC LCSO, BCH 14021015LausanneSwitzerland
| | - Elija Grinhagena
- Laboratory of Catalysis and Organic SynthesisEcole Polytechnique Fédérale de LausanneEPFL SB ISIC LCSO, BCH 14021015LausanneSwitzerland
| | - Gontran Sangouard
- Laboratory of Therapeutic Proteins and PeptidesEcole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LPPT, BCH 53051015LausanneSwitzerland
| | - Christian Heinis
- Laboratory of Therapeutic Proteins and PeptidesEcole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LPPT, BCH 53051015LausanneSwitzerland
| | - Jerome Waser
- Laboratory of Catalysis and Organic SynthesisEcole Polytechnique Fédérale de LausanneEPFL SB ISIC LCSO, BCH 14021015LausanneSwitzerland
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27
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Hommelsheim R, Núñez Ponce HM, Truong KN, Rissanen K, Bolm C. 2-Sulfoximidoyl Acetic Acids from Multicomponent Petasis Reactions and Their Use as Building Blocks in Syntheses of Sulfoximine Benzodiazepine Analogues. Org Lett 2021; 23:3415-3420. [DOI: 10.1021/acs.orglett.1c00874] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Renè Hommelsheim
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, D-52074 Aachen, Germany
| | | | - Khai-Nghi Truong
- University of Jyvaskyla, Department of Chemistry, P.O. Box 35, Survontie 9B, FI-40014 Jyväskylä, Finland
| | - Kari Rissanen
- University of Jyvaskyla, Department of Chemistry, P.O. Box 35, Survontie 9B, FI-40014 Jyväskylä, Finland
| | - Carsten Bolm
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, D-52074 Aachen, Germany
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28
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Ceballos J, Grinhagena E, Sangouard G, Heinis C, Waser J. Cys–Cys and Cys–Lys Stapling of Unprotected Peptides Enabled by Hypervalent Iodine Reagents. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202014511] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Javier Ceballos
- Laboratory of Catalysis and Organic Synthesis Ecole Polytechnique Fédérale de Lausanne EPFL SB ISIC LCSO, BCH 1402 1015 Lausanne Switzerland
| | - Elija Grinhagena
- Laboratory of Catalysis and Organic Synthesis Ecole Polytechnique Fédérale de Lausanne EPFL SB ISIC LCSO, BCH 1402 1015 Lausanne Switzerland
| | - Gontran Sangouard
- Laboratory of Therapeutic Proteins and Peptides Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LPPT, BCH 5305 1015 Lausanne Switzerland
| | - Christian Heinis
- Laboratory of Therapeutic Proteins and Peptides Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LPPT, BCH 5305 1015 Lausanne Switzerland
| | - Jerome Waser
- Laboratory of Catalysis and Organic Synthesis Ecole Polytechnique Fédérale de Lausanne EPFL SB ISIC LCSO, BCH 1402 1015 Lausanne Switzerland
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29
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On-resin multicomponent protocols for biopolymer assembly and derivatization. Nat Protoc 2021; 16:561-578. [PMID: 33473197 DOI: 10.1038/s41596-020-00445-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Accepted: 10/13/2020] [Indexed: 01/29/2023]
Abstract
Solid-phase synthesis represents the methodological showcase for technological advances such as split-and-pool combinatorial chemistry and the automated synthesis of peptides, nucleic acids and polysaccharides. These strategies involve iterative coupling cycles that do not generate functional diversity besides that incorporated by the amino acids, nucleosides and monosaccharide building blocks. In sharp contrast, multicomponent reactions (MCRs) are traditionally used to generate both skeletal and appendage diversity in short, batchwise procedures. On-resin MCRs have traditionally been employed for the construction of heterocycle and peptidomimetic libraries, but that scenario has changed recently, and today the focus is more on the solid-phase derivatization of peptides and oligonucleotides. This review presents relevant experimental details and addresses the synthetic scope of such on-resin multicomponent protocols employed to accomplish specific biopolymer covalent modifications that are practically inviable by traditional solution-phase methodologies. Recommendations are provided to facilitate the implementation of solid-supported protocols and avoid possible pitfalls associated with the selection of the polymeric resin, the solvent and the order and amount of the reagents employed. We describe procedures comprising the multicomponent lipidation, biotinylation and labeling of both termini and the side chains, as well as the use of MCRs in the traceless on-resin synthesis of ligated and cyclic peptides. Solid-phase protocols for the assembly of α-helical and parallel β-sheet peptides as well as hybrid peptide-peptoid and peptide-peptide nucleic acid architectures are described. Finally, the solid-supported multicomponent derivatization of DNA oligonucleotides is illustrated as part of the DNA-encoded library technology relying on MCR-derived heterocyclic compounds.
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30
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Rational Optimization of the Petasis Three‐Component Reaction as a Feasible Elementary Reaction in Polymer Chemistry. MACROMOL CHEM PHYS 2020. [DOI: 10.1002/macp.202000347] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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31
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Hwang J, Borgelt L, Wu P. Multicomponent Petasis Reaction for the Synthesis of Functionalized 2-Aminothiophenes and Thienodiazepines. ACS COMBINATORIAL SCIENCE 2020; 22:495-499. [PMID: 32985878 PMCID: PMC7584359 DOI: 10.1021/acscombsci.0c00173] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
![]()
Multicomponent
Petasis reaction has been widely applied for the synthesis of functionalized
amine building blocks and biologically active compounds. Employing
primary aromatic amines that are not typical reactive substrates contributes
to expand the application scope of the Petasis reaction. In this study,
we demonstrated the synthesis of functionalized 2-aminothiophenes
using Gewald-reaction-derived 2-aminothiophenes as the amine substrates,
whose low reactivity in the Petasis reaction was overcome using hexafluoro-2-propanol
as the solvent in a mild condition. The obtained Petasis products
are amenable for further transformations owing to the presence of
multiple functional handles. A following intramolecular cyclization
of selected Petasis products afforded substituted tricyclic heterocycles
that incorporate a pharmaceutically interesting thienodiazepine moiety.
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Affiliation(s)
- Jimin Hwang
- Chemical Genomics Centre and Department of Chemical Biology, Max Planck Institute of Molecular Physiology, Dortmund 44227, Germany
| | - Lydia Borgelt
- Chemical Genomics Centre and Department of Chemical Biology, Max Planck Institute of Molecular Physiology, Dortmund 44227, Germany
| | - Peng Wu
- Chemical Genomics Centre and Department of Chemical Biology, Max Planck Institute of Molecular Physiology, Dortmund 44227, Germany
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32
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Hinkes SPA, Kämmerer S, Klein CDP. Diversity-oriented synthesis of peptide-boronic acids by a versatile building-block approach. Chem Sci 2020; 11:9898-9903. [PMID: 34094250 PMCID: PMC8162117 DOI: 10.1039/d0sc03999c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 08/20/2020] [Indexed: 12/25/2022] Open
Abstract
A new strategy for the synthesis of peptide-boronic acids (PBAs) is presented. 20 Fmoc-protected natural amino acids with orthogonal side-chain protection were straightforwardly converted into their corresponding boron analogues in three simple steps. Subsequent immobilisation on commercially available 1-glycerol polystyrene resin and on-resin transformations yielded a diversity of sequences in high purity. The strategy eliminates various synthetic obstacles such as multi-step routes, low yields, and inseparable impurities. The described method comprises great potential to be implemented in automated combinatorial approaches by markedly facilitating the access to a variety of PBAs. The coupling of amino acids or other building blocks with α-aminoboronates allows the creation of hybrid molecules with significant potential in various scientific disciplines, such as medicinal chemistry, structural biology, and materials science.
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Affiliation(s)
- Stefan P A Hinkes
- Department of Medicinal Chemistry, Institute of Pharmacy and Molecular Biotechnology (IPMB), Heidelberg University Im Neuenheimer Feld 364 69120 Heidelberg Germany
| | - Severin Kämmerer
- Department of Medicinal Chemistry, Institute of Pharmacy and Molecular Biotechnology (IPMB), Heidelberg University Im Neuenheimer Feld 364 69120 Heidelberg Germany
| | - Christian D P Klein
- Department of Medicinal Chemistry, Institute of Pharmacy and Molecular Biotechnology (IPMB), Heidelberg University Im Neuenheimer Feld 364 69120 Heidelberg Germany
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33
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Li X, Chen S, Zhang WD, Hu HG. Stapled Helical Peptides Bearing Different Anchoring Residues. Chem Rev 2020; 120:10079-10144. [DOI: 10.1021/acs.chemrev.0c00532] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Xiang Li
- School of Pharmacy, Second Military Medical University, Shanghai, China
- Insititute of Translational Medicine, Shanghai University, Shanghai, China
| | - Si Chen
- School of Medicine, Shanghai University, Shanghai, China
| | - Wei-Dong Zhang
- School of Pharmacy, Second Military Medical University, Shanghai, China
- Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Hong-Gang Hu
- Insititute of Translational Medicine, Shanghai University, Shanghai, China
- Ministry of Education Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing, China
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34
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Xiao Q, Ashton DS, Jones ZB, Thompson KP, Price JL. Long-range PEG Stapling: Macrocyclization for Increased Protein Conformational Stability and Resistance to Proteolysis. RSC Chem Biol 2020; 1:273-280. [PMID: 33796855 PMCID: PMC8009319 DOI: 10.1039/d0cb00075b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
We previously showed that long-range stapling of two Asn-linked O-allyl PEG oligomers via olefin metathesis substantially increases the conformational stability of the WW domain through an entropic effect. The impact of stapling was more favorable when the staple connected positions that were far apart in primary sequence but close in the folded tertiary structure. Here we validate these criteria by identifying new stabilizing PEG-stapling sites within the WW domain and the SH3 domain, both β-sheet proteins. We find that stapling via olefin metathesis vs. the copper(i)-catalyzed azide/alkyne cycloaddition (CuAAC) results in similar energetic benefits, suggesting that olefin and triazole staples can be used interchangeably. Proteolysis assays of selected WW variants reveal that the observed staple-based increases in conformational stability lead to enhanced proteolytic resistance. Finally, we find that an intermolecular staple dramatically increases the quaternary structural stability of an α-helical GCN4 coiled-coil heterodimer. Long-range stapling of two Asn-linked PEG oligomers via olefin metathesis substantially increases the conformational stability of the WW and SH3 domain tertiary structures and the GCN4 coiled-coil quaternary structure.![]()
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Affiliation(s)
- Qiang Xiao
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Dallin S Ashton
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Zachary B Jones
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Katherine P Thompson
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Joshua L Price
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
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35
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Hiller NDJ, do Amaral e Silva NA, Tavares TA, Faria RX, Eberlin MN, de Luna Martins D. Arylboronic Acids and their Myriad of Applications Beyond Organic Synthesis. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000396] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Noemi de Jesus Hiller
- Instituto de Química; Laboratório de Catálise e Síntese (Lab CSI); Laboratório 413; Universidade Federal Fluminense; Outeiro de São João Batista s/n; Campus do Valonguinho, Centro Niterói RJ 24020-141 Brasil
| | - Nayane Abreu do Amaral e Silva
- Instituto de Química; Laboratório de Catálise e Síntese (Lab CSI); Laboratório 413; Universidade Federal Fluminense; Outeiro de São João Batista s/n; Campus do Valonguinho, Centro Niterói RJ 24020-141 Brasil
| | - Thais Apolinário Tavares
- Instituto de Química; Laboratório de Catálise e Síntese (Lab CSI); Laboratório 413; Universidade Federal Fluminense; Outeiro de São João Batista s/n; Campus do Valonguinho, Centro Niterói RJ 24020-141 Brasil
| | - Robson Xavier Faria
- Laboratório de Toxoplasmose e outras Protozooses; Instituto Oswaldo Cruz, Fiocruz; Av. Brasil, 4365 Manguinhos Rio de Janeiro RJ 21040-360 Brasil
| | - Marcos Nogueira Eberlin
- Mackenzie Presbyterian University; School of Engineering; Rua da Consolação, 930 SP 01302-907 São Paulo Brasil
| | - Daniela de Luna Martins
- Instituto de Química; Laboratório de Catálise e Síntese (Lab CSI); Laboratório 413; Universidade Federal Fluminense; Outeiro de São João Batista s/n; Campus do Valonguinho, Centro Niterói RJ 24020-141 Brasil
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36
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Diehl AM, Manolikakes G. Palladium‐Catalyzed Decarboxylative Three‐Component Synthesis of α‐Arylglycines: Replacing Boronic with Carboxylic Acids in the Petasis Reaction. ChemCatChem 2020. [DOI: 10.1002/cctc.202000652] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Andreas M. Diehl
- Department of ChemistryTechnische Universität Kaiserslautern Erwin-Schrödinger-Str. Geb. 54 D-67663 Kaiserslautern Germany
| | - Georg Manolikakes
- Department of ChemistryTechnische Universität Kaiserslautern Erwin-Schrödinger-Str. Geb. 54 D-67663 Kaiserslautern Germany
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37
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Vasco AV, Brode M, Méndez Y, Valdés O, Rivera DG, Wessjohann LA. Synthesis of Lactam-Bridged and Lipidated Cyclo-Peptides as Promising Anti-Phytopathogenic Agents. Molecules 2020; 25:E811. [PMID: 32069902 PMCID: PMC7070897 DOI: 10.3390/molecules25040811] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 02/07/2020] [Accepted: 02/07/2020] [Indexed: 12/11/2022] Open
Abstract
Antimicrobial resistance to conventional antibiotics and the limited alternatives to combat plant-threatening pathogens are worldwide problems. Antibiotic lipopeptides exert remarkable membrane activity, which usually is not prone to fast resistance formation, and often show organism-type selectivity. Additional modes of action commonly complement the bioactivity profiles of such compounds. The present work describes a multicomponent-based methodology for the synthesis of cyclic polycationic lipopeptides with stabilized helical structures. The protocol comprises an on solid support Ugi-4-component macrocyclization in the presence of a lipidic isocyanide. Circular dichroism was employed to study the influence of both macrocyclization and lipidation on the amphiphilic helical structure in water and micellar media. First bioactivity studies against model phytopathogens demonstrated a positive effect of the lipidation on the antimicrobial activity.
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Affiliation(s)
- Aldrin V. Vasco
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany; (A.V.V.); (M.B.); (Y.M.)
| | - Martina Brode
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany; (A.V.V.); (M.B.); (Y.M.)
| | - Yanira Méndez
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany; (A.V.V.); (M.B.); (Y.M.)
- Center for Natural Products Research, Faculty of Chemistry, University of Havana, Zapata y G, Havana 10400, Cuba
| | - Oscar Valdés
- Vicerrectoría de Investigación y Postgrado, Universidad Católica del Maule, Talca 3460000, Chile;
| | - Daniel G. Rivera
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany; (A.V.V.); (M.B.); (Y.M.)
- Center for Natural Products Research, Faculty of Chemistry, University of Havana, Zapata y G, Havana 10400, Cuba
| | - Ludger A. Wessjohann
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany; (A.V.V.); (M.B.); (Y.M.)
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38
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Ricardo MG, Ali AM, Plewka J, Surmiak E, Labuzek B, Neochoritis CG, Atmaj J, Skalniak L, Zhang R, Holak TA, Groves M, Rivera DG, Dömling A. Multicomponent Peptide Stapling as a Diversity‐Driven Tool for the Development of Inhibitors of Protein–Protein Interactions. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201916257] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Manuel G. Ricardo
- Faculty of Chemistry, Center for Natural Product ResearchUniversity of Havana Cuba
| | - Ameena M. Ali
- Department of PharmacyDrug Design group, University of Groningen The Netherlands
| | - Jacek Plewka
- Faculty of ChemistryJagiellonian University Krakow Poland
| | - Ewa Surmiak
- Faculty of ChemistryJagiellonian University Krakow Poland
| | - Beata Labuzek
- Faculty of ChemistryJagiellonian University Krakow Poland
| | - Constantinos G. Neochoritis
- Department of PharmacyDrug Design group, University of Groningen The Netherlands
- Department of ChemistryUniversity of Crete Greece
| | - Jack Atmaj
- Department of PharmacyDrug Design group, University of Groningen The Netherlands
- Faculty of ChemistryJagiellonian University Krakow Poland
| | | | - Ran Zhang
- Department of PharmacyDrug Design group, University of Groningen The Netherlands
| | - Tad A. Holak
- Faculty of ChemistryJagiellonian University Krakow Poland
| | - Matthew Groves
- Department of PharmacyDrug Design group, University of Groningen The Netherlands
| | - Daniel G. Rivera
- Faculty of Chemistry, Center for Natural Product ResearchUniversity of Havana Cuba
| | - Alexander Dömling
- Department of PharmacyDrug Design group, University of Groningen The Netherlands
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39
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Ricardo MG, Ali AM, Plewka J, Surmiak E, Labuzek B, Neochoritis CG, Atmaj J, Skalniak L, Zhang R, Holak TA, Groves M, Rivera DG, Dömling A. Multicomponent Peptide Stapling as a Diversity-Driven Tool for the Development of Inhibitors of Protein-Protein Interactions. Angew Chem Int Ed Engl 2020; 59:5235-5241. [PMID: 31944488 DOI: 10.1002/anie.201916257] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Indexed: 12/12/2022]
Abstract
Stapled peptides are chemical entities in-between biologics and small molecules, which have proven to be the solution to high affinity protein-protein interaction antagonism, while keeping control over pharmacological performance such as stability and membrane penetration. We demonstrate that the multicomponent reaction-based stapling is an effective strategy for the development of α-helical peptides with highly potent dual antagonistic action of MDM2 and MDMX binding p53. Such a potent inhibitory activity of p53-MDM2/X interactions was assessed by fluorescence polarization, microscale thermophoresis, and 2D NMR, while several cocrystal structures with MDM2 were obtained. This MCR stapling protocol proved efficient and versatile in terms of diversity generation at the staple, as evidenced by the incorporation of both exo- and endo-cyclic hydrophobic moieties at the side chain cross-linkers. The interaction of the Ugi-staple fragments with the target protein was demonstrated by crystallography.
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Affiliation(s)
- Manuel G Ricardo
- Faculty of Chemistry, Center for Natural Product Research, University of Havana, Cuba
| | - Ameena M Ali
- Department of Pharmacy, Drug Design group, University of, Groningen, The Netherlands
| | - Jacek Plewka
- Faculty of Chemistry, Jagiellonian University, Krakow, Poland
| | - Ewa Surmiak
- Faculty of Chemistry, Jagiellonian University, Krakow, Poland
| | - Beata Labuzek
- Faculty of Chemistry, Jagiellonian University, Krakow, Poland
| | - Constantinos G Neochoritis
- Department of Pharmacy, Drug Design group, University of, Groningen, The Netherlands.,Department of Chemistry, University of, Crete, Greece
| | - Jack Atmaj
- Department of Pharmacy, Drug Design group, University of, Groningen, The Netherlands.,Faculty of Chemistry, Jagiellonian University, Krakow, Poland
| | - Lukasz Skalniak
- Faculty of Chemistry, Jagiellonian University, Krakow, Poland
| | - Ran Zhang
- Department of Pharmacy, Drug Design group, University of, Groningen, The Netherlands
| | - Tad A Holak
- Faculty of Chemistry, Jagiellonian University, Krakow, Poland
| | - Matthew Groves
- Department of Pharmacy, Drug Design group, University of, Groningen, The Netherlands
| | - Daniel G Rivera
- Faculty of Chemistry, Center for Natural Product Research, University of Havana, Cuba
| | - Alexander Dömling
- Department of Pharmacy, Drug Design group, University of, Groningen, The Netherlands
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40
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Mahesh S, Adebomi V, Muneeswaran ZP, Raj M. Bioinspired Nitroalkylation for Selective Protein Modification and Peptide Stapling. Angew Chem Int Ed Engl 2020; 59:2793-2801. [DOI: 10.1002/anie.201908593] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Indexed: 01/05/2023]
Affiliation(s)
- Sriram Mahesh
- Department of Chemistry and Biochemistry Auburn University Auburn AL 36830 USA
| | - Victor Adebomi
- Department of Chemistry and Biochemistry Auburn University Auburn AL 36830 USA
| | - Zilma P. Muneeswaran
- Department of Chemistry and Biochemistry Seton Hall University South Orange NJ USA
| | - Monika Raj
- Department of Chemistry and Biochemistry Auburn University Auburn AL 36830 USA
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41
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Mahesh S, Adebomi V, Muneeswaran ZP, Raj M. Bioinspired Nitroalkylation for Selective Protein Modification and Peptide Stapling. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201908593] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Sriram Mahesh
- Department of Chemistry and Biochemistry Auburn University Auburn AL 36830 USA
| | - Victor Adebomi
- Department of Chemistry and Biochemistry Auburn University Auburn AL 36830 USA
| | - Zilma P. Muneeswaran
- Department of Chemistry and Biochemistry Seton Hall University South Orange NJ USA
| | - Monika Raj
- Department of Chemistry and Biochemistry Auburn University Auburn AL 36830 USA
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42
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Vasco AV, Moya CG, Gröger S, Brandt W, Balbach J, Pérez CS, Wessjohann LA, Rivera DG. Insights into the secondary structures of lactam N-substituted stapled peptides. Org Biomol Chem 2020; 18:3838-3842. [DOI: 10.1039/d0ob00767f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
NMR and CD studies together with molecular dynamics simulation reveal new insights into the s-cis/s-trans isomerism and the effect of the lactam bridge N-substituent on the secondary structure of stapled peptides.
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Affiliation(s)
- Aldrin V. Vasco
- Department of Bioorganic Chemistry
- Leibniz Institute of Plant Biochemistry
- Halle/Saale
- Germany
| | - Celia G. Moya
- Center for Natural Products Research
- Faculty of Chemistry
- University of Havana
- Havana
- Cuba
| | - Stefan Gröger
- Institute of Physics/Biophysics and Center for Structural and Dynamics of Proteins
- Martin Luther University Halle-Wittenberg
- Germany
| | - Wolfgang Brandt
- Department of Bioorganic Chemistry
- Leibniz Institute of Plant Biochemistry
- Halle/Saale
- Germany
| | - Jochen Balbach
- Institute of Physics/Biophysics and Center for Structural and Dynamics of Proteins
- Martin Luther University Halle-Wittenberg
- Germany
| | - Carlos S. Pérez
- Center for Natural Products Research
- Faculty of Chemistry
- University of Havana
- Havana
- Cuba
| | - Ludger A. Wessjohann
- Department of Bioorganic Chemistry
- Leibniz Institute of Plant Biochemistry
- Halle/Saale
- Germany
| | - Daniel G. Rivera
- Department of Bioorganic Chemistry
- Leibniz Institute of Plant Biochemistry
- Halle/Saale
- Germany
- Center for Natural Products Research
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43
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Wu P, Givskov M, Nielsen TE. Reactivity and Synthetic Applications of Multicomponent Petasis Reactions. Chem Rev 2019; 119:11245-11290. [PMID: 31454230 PMCID: PMC6813545 DOI: 10.1021/acs.chemrev.9b00214] [Citation(s) in RCA: 125] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Indexed: 02/06/2023]
Abstract
The Petasis boron-Mannich reaction, simply referred to as the Petasis reaction, is a powerful multicomponent coupling reaction of a boronic acid, an amine, and a carbonyl derivative. Highly functionalized amines with multiple stereogenic centers can be efficiently accessed via the Petasis reaction with high levels of both diastereoselectivity and enantioselectivity. By drawing attention to examples reported in the past 8 years, this Review demonstrates the breadth of the reactivity and synthetic applications of Petasis reactions in several frontiers: the expansion of the substrate scope in the classic three-component process; nonclassic Petasis reactions with additional components; Petasis-type reactions with noncanonical substrates, mechanism, and products; new asymmetric versions assisted by chiral catalysts; combinations with a secondary or tertiary transformation in a cascade- or sequence-specific manner to access structurally complex, natural-product-like heterocycles; and the synthesis of polyhydroxy alkaloids and biologically interesting molecules.
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Affiliation(s)
- Peng Wu
- Chemical
Genomics Center of the Max Planck Society, Dortmund 44227, Germany
- Department
of Chemical Biology, Max Planck Institute
of Molecular Physiology, Dortmund 44227, Germany
- Chemical
Biology and Therapeutics Science, Broad
Institute of MIT and Harvard, Cambridge, Massachusetts 02142, United States
- Department
of Medicine and Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, United States
- Department
of Chemistry, Massachusetts Institute of
Technology, Cambridge, Massachusetts 02139, United States
- Department
of Drug Design and Pharmacology, University
of Copenhagen, Copenhagen DK-2100, Denmark
| | - Michael Givskov
- Costerton
Biofilm Center, Department of Immunology and Microbiology, University of Copenhagen, Copenhagen DK-2200, Denmark
- Singapore
Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore
| | - Thomas E. Nielsen
- Costerton
Biofilm Center, Department of Immunology and Microbiology, University of Copenhagen, Copenhagen DK-2200, Denmark
- Singapore
Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore
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44
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Jing X, Jin K. A gold mine for drug discovery: Strategies to develop cyclic peptides into therapies. Med Res Rev 2019; 40:753-810. [PMID: 31599007 DOI: 10.1002/med.21639] [Citation(s) in RCA: 96] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 09/05/2019] [Accepted: 09/26/2019] [Indexed: 12/19/2022]
Abstract
As a versatile therapeutic modality, peptides attract much attention because of their great binding affinity, low toxicity, and the capability of targeting traditionally "undruggable" protein surfaces. However, the deficiency of cell permeability and metabolic stability always limits the success of in vitro bioactive peptides as drug candidates. Peptide macrocyclization is one of the most established strategies to overcome these limitations. Over the past decades, more than 40 cyclic peptide drugs have been clinically approved, the vast majority of which are derived from natural products. The de novo discovered cyclic peptides on the basis of rational design and in vitro evolution, have also enabled the binding with targets for which nature provides no solutions. The current review summarizes different classes of cyclic peptides with diverse biological activities, and presents an overview of various approaches to develop cyclic peptide-based drug candidates, drawing upon series of examples to illustrate each strategy.
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Affiliation(s)
- Xiaoshu Jing
- Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Kang Jin
- Department of Medicinal Chemistry, School of Pharmacy, Shandong University, Jinan, Shandong, China
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45
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Todorovic M, Schwab KD, Zeisler J, Zhang C, Bénard F, Perrin DM. Fluorescent Isoindole Crosslink (FlICk) Chemistry: A Rapid, User-friendly Stapling Reaction. Angew Chem Int Ed Engl 2019; 58:14120-14124. [PMID: 31211905 DOI: 10.1002/anie.201906514] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2019] [Indexed: 12/14/2022]
Abstract
The stabilization of peptide secondary structure via stapling is a ubiquitous goal for creating new probes, imaging agents, and drugs. Inspired by indole-derived crosslinks found in natural peptide toxins, we employed ortho-phthalaldehydes to create isoindole staples, thus transforming inactive linear and monocyclic precursors into bioactive monocyclic and bicyclic products. Mild, metal-free conditions give an array of macrocyclic α-melanocyte-stimulating hormone (α-MSH) derivatives, of which several isoindole-stapled α-MSH analogues (Ki ≈1 nm) are found to be as potent as α-MSH. Analogously, late-stage intra-annular isoindole stapling furnished a bicyclic peptide mimic of α-amanitin that is cytotoxic to CHO cells (IC50 =70 μm). Given its user-friendliness, we have termed this approach FlICk (fluorescent isoindole crosslink) chemistry.
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Affiliation(s)
- Mihajlo Todorovic
- Chemistry Department, UBC, 2036 Main Mall, Vancouver, B.C., V6T1Z1, Canada
| | - Katerina D Schwab
- Chemistry Department, UBC, 2036 Main Mall, Vancouver, B.C., V6T1Z1, Canada
| | - Jutta Zeisler
- B.C. Cancer Agency Research Centre, 675 West 10th Avenue, Vancouver, BC, V5Z 1L3, Canada
| | - Chengcheng Zhang
- B.C. Cancer Agency Research Centre, 675 West 10th Avenue, Vancouver, BC, V5Z 1L3, Canada
| | - Francois Bénard
- B.C. Cancer Agency Research Centre, 675 West 10th Avenue, Vancouver, BC, V5Z 1L3, Canada
| | - David M Perrin
- Chemistry Department, UBC, 2036 Main Mall, Vancouver, B.C., V6T1Z1, Canada
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46
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Todorovic M, Schwab KD, Zeisler J, Zhang C, Bénard F, Perrin DM. Fluorescent Isoindole Crosslink (FlICk) Chemistry: A Rapid, User‐friendly Stapling Reaction. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906514] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Mihajlo Todorovic
- Chemistry Department UBC 2036 Main Mall Vancouver B.C. V6T1Z1 Canada
| | | | - Jutta Zeisler
- B.C. Cancer Agency Research Centre 675 West 10th Avenue Vancouver BC V5Z 1L3 Canada
| | - Chengcheng Zhang
- B.C. Cancer Agency Research Centre 675 West 10th Avenue Vancouver BC V5Z 1L3 Canada
| | - Francois Bénard
- B.C. Cancer Agency Research Centre 675 West 10th Avenue Vancouver BC V5Z 1L3 Canada
| | - David M. Perrin
- Chemistry Department UBC 2036 Main Mall Vancouver B.C. V6T1Z1 Canada
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Reguera L, Attorresi CI, Ramírez JA, Rivera DG. Steroid diversification by multicomponent reactions. Beilstein J Org Chem 2019; 15:1236-1256. [PMID: 31293671 PMCID: PMC6604710 DOI: 10.3762/bjoc.15.121] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 05/14/2019] [Indexed: 12/19/2022] Open
Abstract
Reports on structural diversification of steroids by means of multicomponent reactions (MCRs) have significantly increased over the last decade. This review covers the most relevant strategies dealing with the use of steroidal substrates in MCRs, including the synthesis of steroidal heterocycles and macrocycles as well as the conjugation of steroids to amino acids, peptides and carbohydrates. We demonstrate that steroids are available with almost all types of MCR reactive functionalities, e.g., carbonyl, carboxylic acid, alkyne, amine, isocyanide, boronic acid, etc., and that steroids are suitable starting materials for relevant MCRs such as those based on imine and isocyanide. The focus is mainly posed on proving the amenability of MCRs for the diversity-oriented derivatization of naturally occurring steroids and the construction of complex steroid-based platforms for drug discovery, chemical biology and supramolecular chemistry applications.
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Affiliation(s)
- Leslie Reguera
- Center for Natural Product Research, Faculty of Chemistry, University of Havana, Zapata y G, Havana 10400, Cuba
| | - Cecilia I Attorresi
- Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires. Ciudad Universitaria, Ciudad Autónoma de Buenos Aires, C1428EGA, Argentina.,CONICET - Universidad de Buenos Aires. Unidad de Microanálisis y Métodos Físicos Aplicados a Química Orgánica (UMYMFOR). Ciudad Universitaria, Ciudad Autónoma de Buenos Aires, C1428EGA, Argentina
| | - Javier A Ramírez
- Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires. Ciudad Universitaria, Ciudad Autónoma de Buenos Aires, C1428EGA, Argentina.,CONICET - Universidad de Buenos Aires. Unidad de Microanálisis y Métodos Físicos Aplicados a Química Orgánica (UMYMFOR). Ciudad Universitaria, Ciudad Autónoma de Buenos Aires, C1428EGA, Argentina
| | - Daniel G Rivera
- Center for Natural Product Research, Faculty of Chemistry, University of Havana, Zapata y G, Havana 10400, Cuba
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Yi J, Badir SO, Alam R, Molander GA. Photoredox-Catalyzed Multicomponent Petasis Reaction with Alkyltrifluoroborates. Org Lett 2019; 21:4853-4858. [PMID: 31145628 DOI: 10.1021/acs.orglett.9b01747] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A redox-neutral alkyl Petasis reaction has been developed that proceeds via photoredox catalysis. A diverse set of primary, secondary, and tertiary alkyltrifluoroborates participate effectively in this reaction through a single-electron transfer mechanism, in contrast to the traditional two-electron Petasis reaction, which accommodates only unsaturated boronic acids. This protocol is ideal to diversify benzyl-type and glyoxalate-derived aldehydes, anilines, and alkyltrifluoroborates toward the rapid assembly of libraries of higher molecular complexity important in pharmaceutical and agrochemical settings.
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Affiliation(s)
- Jun Yi
- Roy and Diana Vagelos Laboratories, Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104-6323 , United States.,Jiangsu Laboratory of Advanced Functional Materials, School of Chemistry and Materials Engineering , Changshu Institute of Technology , Changshu 215500 , China
| | - Shorouk O Badir
- Roy and Diana Vagelos Laboratories, Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104-6323 , United States
| | - Rauful Alam
- Roy and Diana Vagelos Laboratories, Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104-6323 , United States
| | - Gary A Molander
- Roy and Diana Vagelos Laboratories, Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104-6323 , United States
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49
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Reguera L, Rivera DG. Multicomponent Reaction Toolbox for Peptide Macrocyclization and Stapling. Chem Rev 2019; 119:9836-9860. [PMID: 30990310 DOI: 10.1021/acs.chemrev.8b00744] [Citation(s) in RCA: 182] [Impact Index Per Article: 36.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
In the past decade, multicomponent reactions have experienced a renaissance as powerful peptide macrocyclization tools enabling the rapid creation of skeletal complexity and diversity with low synthetic cost. This review provides both a historical and modern overview of the development of the peptide multicomponent macrocyclization as a strategy capable to compete with the classic peptide cyclization methods in terms of chemical efficiency and synthetic scope. We prove that the utilization of multicomponent reactions for cyclizing peptides by either their termini or side chains provides a key advantage over those more established methods; that is, the possibility to explore the cyclic peptide chemotype space not only at the amino acid sequence but also at the ring-forming moiety. Owing to its multicomponent nature, this type of peptide cyclization process is well-suited to generate diversity at both the endo- and exo-cyclic fragments formed during the ring-closing step, which stands as a distinctive and useful characteristic for the creation and screening of cyclic peptide libraries. Examples of the novel multicomponent peptide stapling approach and heterocycle ring-forming macrocyclizations are included, along with multicomponent methods incorporating macrocyclization handles and the one-pot syntheses of macromulticyclic peptide cages. Interesting applications of this strategy in the field of drug discovery and chemical biology are provided.
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Affiliation(s)
- Leslie Reguera
- Center for Natural Product Research, Faculty of Chemistry , University of Havana , Zapata y G , Havana 10400 , Cuba
| | - Daniel G Rivera
- Center for Natural Product Research, Faculty of Chemistry , University of Havana , Zapata y G , Havana 10400 , Cuba
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Yamaguchi A, Kaldas SJ, Appavoo SD, Diaz DB, Yudin AK. Conformationally stable peptide macrocycles assembled using the Petasis borono-Mannich reaction. Chem Commun (Camb) 2019; 55:10567-10570. [DOI: 10.1039/c9cc05934b] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Synthesis and the structural analysis of conformationally stable peptide macrocycles assembled using the Petasis borono-Mannich reaction are reported.
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Affiliation(s)
- Akitake Yamaguchi
- Davenport Research Laboratories
- Department of Chemistry, University of Toronto
- Toronto
- Canada
| | - Sherif J. Kaldas
- Davenport Research Laboratories
- Department of Chemistry, University of Toronto
- Toronto
- Canada
| | - Solomon D. Appavoo
- Davenport Research Laboratories
- Department of Chemistry, University of Toronto
- Toronto
- Canada
| | - Diego B. Diaz
- Davenport Research Laboratories
- Department of Chemistry, University of Toronto
- Toronto
- Canada
| | - Andrei K. Yudin
- Davenport Research Laboratories
- Department of Chemistry, University of Toronto
- Toronto
- Canada
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