1
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Jo WS, Curtis BJ, Rehan M, Adrover-Castellano ML, Sherman DH, Healy AR. N-to- S Acyl Transfer as an Enabling Strategy in Asymmetric and Chemoenzymatic Synthesis. JACS AU 2024; 4:2058-2066. [PMID: 38818054 PMCID: PMC11134368 DOI: 10.1021/jacsau.4c00257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Revised: 05/01/2024] [Accepted: 05/02/2024] [Indexed: 06/01/2024]
Abstract
The observation of thioester-mediated acyl transfer processes in nature has inspired the development of novel protein synthesis and functionalization methodologies. The chemoselective transfer of an acyl group from S-to-N is the basis of several powerful ligation strategies. In this work, we sought to apply the reverse process, the transfer of an acyl group from N-to-S, as a method to convert stable chiral amides into more reactive thioesters. To this end, we developed a novel cysteine-derived oxazolidinone that serves as both a chiral imide auxiliary and an acyl transfer agent. This auxiliary combines the desirable features of rigid chiral imides as templates for asymmetric transformations with the synthetic applicability of thioesters. We demonstrate that the auxiliary can be applied in a range of highly selective asymmetric transformations. Subsequent intramolecular N-to-S acyl transfer of the chiral product and in situ trapping of the resulting thioester provides access to diverse carboxylic acid derivatives under mild conditions. The oxazolidinone thioester products can also be isolated and used in Pd-mediated transformations to furnish highly valuable chiral scaffolds, such as noncanonical amino acids, cyclic ketones, tetrahydropyrones, and dihydroquinolinones. Finally, we demonstrate that the oxazolidinone thioesters can also serve as a surrogate for SNAC-thioesters, enabling their seamless use as non-native substrates in biocatalytic transformations.
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Affiliation(s)
- Woonkee S Jo
- Chemistry Program, New York University Abu Dhabi (NYUAD), Saadiyat Island, Abu Dhabi 129188, United Arab Emirates (UAE)
| | - Brian J Curtis
- Life Sciences Institute, University of Michigan, 210 Washtenaw Avenue, Ann Arbor, MI 48109, USA
| | - Mohammad Rehan
- Chemistry Program, New York University Abu Dhabi (NYUAD), Saadiyat Island, Abu Dhabi 129188, United Arab Emirates (UAE)
| | | | - David H Sherman
- Life Sciences Institute, University of Michigan, 210 Washtenaw Avenue, Ann Arbor, MI 48109, USA
- Departments of Medicinal Chemistry, Chemistry, and Microbiology & Immunology, University of Michigan, Ann Arbor, MI 48109USA
| | - Alan R Healy
- Chemistry Program, New York University Abu Dhabi (NYUAD), Saadiyat Island, Abu Dhabi 129188, United Arab Emirates (UAE)
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2
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Enyedi KN, Basa B, Mező G, Lajkó E. Photoinduced Hydrogel-Forming Caged Peptides with Improved Solubility. ACS OMEGA 2024; 9:6894-6900. [PMID: 38371799 PMCID: PMC10870261 DOI: 10.1021/acsomega.3c08289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Revised: 12/14/2023] [Accepted: 01/18/2024] [Indexed: 02/20/2024]
Abstract
Self-assembling peptides are attractive alternatives in the field of biomaterial science due to their variability and biocompatibility. Unfortunately, such peptides have poor solubility, and their purification, synthesis, and overall handling are challenging. Our main objective was to develop a cage peptide design with full control over self-assembly. Theoretically, aggregation can be suppressed by temporally masking the amino acid side chains at critical positions. Taking into account several biological and synthetic requirements, a photosensitive protecting group, p-hydroxy-phenacyl (pHP), was chosen as the "masking" moiety. To test our theory, EAK16-II was chosen as a model self-assembling peptide, and a caged derivative containing photosensitive pHP groups was synthesized. Both spectroscopic and in vitro experiments on A2058 melanoma cells confirmed our hypothesis that the caged-EAK16-II peptide has good solubility and that the hydrogel formed after photolysis results in similar viability and cell aggregate formation of melanoma cells as the native EAK16-II-based hydrogel.
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Affiliation(s)
- Kata N. Enyedi
- Faculty
of Science, Institute of Chemistry, Department of Organic Chemistry, Eötvös Loránd University, Pázmány Péter
sétány 1/A, 1117 Budapest, Hungary
- HUN-REN-ELTE
Research Group of Peptide Chemistry, Eötvös
Loránd University, Pázmány Péter sétány 1/A, 1117 Budapest, Hungary
| | - Bettina Basa
- Faculty
of Science, Institute of Chemistry, Department of Organic Chemistry, Eötvös Loránd University, Pázmány Péter
sétány 1/A, 1117 Budapest, Hungary
- HUN-REN-ELTE
Research Group of Peptide Chemistry, Eötvös
Loránd University, Pázmány Péter sétány 1/A, 1117 Budapest, Hungary
| | - Gábor Mező
- Faculty
of Science, Institute of Chemistry, Department of Organic Chemistry, Eötvös Loránd University, Pázmány Péter
sétány 1/A, 1117 Budapest, Hungary
- HUN-REN-ELTE
Research Group of Peptide Chemistry, Eötvös
Loránd University, Pázmány Péter sétány 1/A, 1117 Budapest, Hungary
| | - Eszter Lajkó
- Department
of Genetics, Cell- and Immunobiology, Semmelweis
University, Nagyvárad tér 4, 1089 Budapest, Hungary
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3
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Kubra KT, Hasan MM, Hasan MN, Salman MS, Khaleque MA, Sheikh MC, Rehan AI, Rasee AI, Waliullah R, Awual ME, Hossain MS, Alsukaibi AK, Alshammari HM, Awual MR. The heavy lanthanide of Thulium(III) separation and recovery using specific ligand-based facial composite adsorbent. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.131415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2023]
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4
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Hasan MN, Salman MS, Hasan MM, Kubra KT, Sheikh MC, Rehan AI, Rasee AI, Awual ME, Waliullah R, Hossain MS, Islam A, Khandaker S, Alsukaibi AK, Alshammari HM, Awual MR. Assessing sustainable Lutetium(III) ions adsorption and recovery using novel composite hybrid nanomaterials. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2022.134795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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5
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Improving copper(II) ion detection and adsorption from wastewater by the ligand-functionalized composite adsorbent. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2023.135259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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6
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Hasan M, Tul Kubra K, Hasan N, Awual E, Salman S, Sheikh C, Islam Rehan A, Islam Rasee A, Waliullah R, Islam S, Khandaker S, Islam A, Sohrab Hossain M, Alsukaibi AK, Alshammari HM, Awual R. Sustainable ligand-modified based composite material for the selective and effective cadmium(II) capturing from wastewater. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.121125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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7
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Simultaneous toxic Cd(II) and Pb(II) encapsulation from contaminated water using Mg/Al-LDH composite materials. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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8
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Bilbrough T, Piemontese E, Seitz O. Dissecting the role of protein phosphorylation: a chemical biology toolbox. Chem Soc Rev 2022; 51:5691-5730. [PMID: 35726784 DOI: 10.1039/d1cs00991e] [Citation(s) in RCA: 55] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Protein phosphorylation is a crucial regulator of protein and cellular function, yet, despite identifying an enormous number of phosphorylation sites, the role of most is still unclear. Each phosphoform, the particular combination of phosphorylations, of a protein has distinct and diverse biological consequences. Aberrant phosphorylation is implicated in the development of many diseases. To investigate their function, access to defined protein phosphoforms is essential. Materials obtained from cells often are complex mixtures. Recombinant methods can provide access to defined phosphoforms if site-specifically acting kinases are known, but the methods fail to provide homogenous material when several amino acid side chains compete for phosphorylation. Chemical and chemoenzymatic synthesis has provided an invaluable toolbox to enable access to previously unreachable phosphoforms of proteins. In this review, we selected important tools that enable access to homogeneously phosphorylated protein and discuss examples that demonstrate how they can be applied. Firstly, we discuss the synthesis of phosphopeptides and proteins through chemical and enzymatic means and their advantages and limitations. Secondly, we showcase illustrative examples that applied these tools to answer biological questions pertaining to proteins involved in signal transduction, control of transcription, neurodegenerative diseases and aggregation, apoptosis and autophagy, and transmembrane proteins. We discuss the opportunities and challenges in the field.
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Affiliation(s)
- Tim Bilbrough
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - Emanuele Piemontese
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - Oliver Seitz
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
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9
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Kawakami T, Sasakura E, Miyanoiri Y, Hojo H. Relative configuration of Cys-Pro ester peptides in thioester formation. J Pept Sci 2022; 28:e3406. [PMID: 35043501 DOI: 10.1002/psc.3406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 01/13/2022] [Accepted: 01/15/2022] [Indexed: 11/11/2022]
Abstract
A peptide containing a cysteinyl prolyl ester (CPE) moiety at the C-terminus (CPE peptide) was transformed into a diketopiperazine (DKP) thioester via an intramolecular N-S acyl shift reaction, and was then used for peptide ligation. The difference in reactivity between the CPE peptide stereoisomers was examined. In reactions of the CPE peptides that contained L-Cys-L-Pro or D-Cys-D-Pro, the desired DKP thioester was formed at the preceding amino acid residue. On the other hand, in reactions of the CPE peptides that contained D-Cys-L-Pro or L-Cys-D-Pro, a thiolactone was formed at the C-terminal prolyl ester, and the ligation occurred at the C-terminal Pro residue. Using this reaction, it was possible to efficiently prepare a cyclic peptide.
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Affiliation(s)
- Toru Kawakami
- Institute for Protein Research, Osaka University, Osaka, Japan
| | - Eri Sasakura
- Institute for Protein Research, Osaka University, Osaka, Japan
| | - Yohei Miyanoiri
- Institute for Protein Research, Osaka University, Osaka, Japan
| | - Hironobu Hojo
- Institute for Protein Research, Osaka University, Osaka, Japan
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10
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Patil NA. Conjugation Approaches for Peptide-Mediated Delivery of Oligonucleotides Therapeutics. Aust J Chem 2021. [DOI: 10.1071/ch21131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Shigenaga A. Theoretical study on reaction mechanism of phosphate-catalysed N-S acyl transfer of N-sulfanylethylanilide (SEAlide). Org Biomol Chem 2020; 18:9706-9711. [PMID: 33237096 DOI: 10.1039/d0ob01968b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
C-Terminally thioesterificated peptides are essential building blocks for chemical protein synthesis. To date, many acyl transfer auxiliaries have been developed to enable facile preparation of peptide thioesters. We previously developed an N-sulfanylethylanilide (SEAlide) auxiliary, which causes an N-S acyl transfer reaction upon addition of phosphate salt to convert a C-terminal amide to a thioester. The mechanism of how phosphate triggers the reaction is speculative, and the details are unknown. In this study, the mechanism by which phosphate promotes acyl transfer is discussed based on density functional theory (DFT) calculations and non-covalent interaction (NCI) analysis. As a result, although the notion that phosphate acts as an acid-base catalyst, as speculated in our previous study, was correct, it became clear that two competing reaction pathways exist: a previously proposed stepwise pathway and a concerted one. Furthermore, calculation was performed in the presence of various additives other than phosphate to uncover the effect of the additives on the stability of transition states.
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Affiliation(s)
- Akira Shigenaga
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Hiroshima 729-0292, Japan.
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12
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Praveen P, Tailhades J, Rosengren KJ, Liu M, Wade JD, Bathgate RAD, Hossain MA. Effects of C-Terminal B-Chain Modifications in a Relaxin 3 Agonist Analogue. ACS Med Chem Lett 2020; 11:2336-2340. [PMID: 33214850 DOI: 10.1021/acsmedchemlett.0c00456] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 10/20/2020] [Indexed: 01/11/2023] Open
Abstract
The receptor for the neuropeptide relaxin 3, relaxin family peptide 3 (RXFP3) receptor, is an attractive pharmacological target for the control of eating, addictive, and psychiatric behaviors. Several structure-activity relationship studies on both human relaxin 3 (containing 3 disulfide bonds) and its analogue A2 (two disulfide bonds) suggest that the C-terminal carboxylic acid of the tryptophan residue in the B-chain is important for RXFP3 activity. In this study, we have added amide, alcohol, carbamate, and ester functionalities to the C-terminus of A2 and compared their structures and functions. As expected, the C-terminal amide form of A2 showed lower binding affinity for RXFP3 while ester and alcohol substitutions also demonstrated lower affinity. However, while these analogues showed slightly lower binding affinity, there was no significant difference in activation of RXFP3 compared to A2 bearing a C-terminal carboxylic acid, suggesting the binding pocket is able to accommodate additional atoms.
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Affiliation(s)
- Praveen Praveen
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Victoria 3052, Australia
| | - Julien Tailhades
- The Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria 3800, Australia
- EMBL Australia, Monash University, Clayton, Victoria 3800, Australia
| | - K. Johan Rosengren
- School of Biomedical Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Mengjie Liu
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Victoria 3052, Australia
| | - John D. Wade
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Victoria 3052, Australia
| | - Ross A. D. Bathgate
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Victoria 3052, Australia
| | - Mohammed Akhter Hossain
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Victoria 3052, Australia
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13
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14
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Horváth D, Taricska N, Keszei E, Stráner P, Farkas V, Tóth GK, Perczel A. Compactness of Protein Folds Alters Disulfide-Bond Reducibility by Three Orders of Magnitude: A Comprehensive Kinetic Case Study on the Reduction of Differently Sized Tryptophan Cage Model Proteins. Chembiochem 2019; 21:681-695. [PMID: 31475422 PMCID: PMC7079008 DOI: 10.1002/cbic.201900470] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Indexed: 12/12/2022]
Abstract
A new approach to monitor disulfide-bond reduction in the vicinity of aromatic cluster(s) has been derived by using the near-UV range (λ=266-293 nm) of electronic circular dichroism (ECD) spectra. By combining the results from NMR and ECD spectroscopy, the 3D fold characteristics and associated reduction rate constants (k) of E19_SS, which is a highly thermostable, disulfide-bond reinforced 39-amino acid long exenatide mimetic, and its N-terminally truncated derivatives have been determined under different experimental conditions. Single disulfide bond reduction of the E19_SS model (with an 18-fold excess of tris(2-carboxyethyl)phosphine, pH 7, 37 °C) takes hours, which is 20-30 times longer than that expected, and thus, would not reach completion by applying commonly used reduction protocols. It is found that structural, steric, and electrostatic factors influence the reduction rate, resulting in orders of magnitude differences in reduction half-lives (900>t1/2 >1 min) even for structurally similar, well-folded derivatives of a small model protein.
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Affiliation(s)
- Dániel Horváth
- Laboratory of Structural Chemistry and Biology and, MTA-ELTE Protein Modeling Research Group at the Institute of Chemistry, Eötvös Loránd University, 112, P. O. Box 32, 1518, Budapest, Hungary
| | - Nóra Taricska
- Laboratory of Structural Chemistry and Biology and, MTA-ELTE Protein Modeling Research Group at the Institute of Chemistry, Eötvös Loránd University, 112, P. O. Box 32, 1518, Budapest, Hungary
| | - Ernő Keszei
- Chemical Kinetics Laboratory, Institute of Chemistry, Eötvös Loránd University, 112, P. O. Box 32, 1518, Budapest, Hungary
| | - Pál Stráner
- Laboratory of Structural Chemistry and Biology and, MTA-ELTE Protein Modeling Research Group at the Institute of Chemistry, Eötvös Loránd University, 112, P. O. Box 32, 1518, Budapest, Hungary
| | - Viktor Farkas
- Laboratory of Structural Chemistry and Biology and, MTA-ELTE Protein Modeling Research Group at the Institute of Chemistry, Eötvös Loránd University, 112, P. O. Box 32, 1518, Budapest, Hungary
| | - Gábor K Tóth
- Department of Medical Chemistry, Faculty of General Medicine, University of Szeged, Szeged Dóm tér 8, H-6720, Szeged, Hungary
| | - András Perczel
- Laboratory of Structural Chemistry and Biology and, MTA-ELTE Protein Modeling Research Group at the Institute of Chemistry, Eötvös Loránd University, 112, P. O. Box 32, 1518, Budapest, Hungary
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15
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Patil NA, Karas JA, Wade JD, Hossain MA, Tailhades J. Rapid Photolysis‐Mediated Folding of Disulfide‐Rich Peptides. Chemistry 2019; 25:8599-8603. [DOI: 10.1002/chem.201901334] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Indexed: 12/11/2022]
Affiliation(s)
- Nitin A. Patil
- The Monash Biomedicine Discovery Institute 15 Innovation Walk Clayton VIC 3800 Australia
| | - John A. Karas
- Department of Pharmacology and TherapeuticsThe University of Melbourne Victoria 3010 Australia
| | - John D. Wade
- Department of Pharmacology and TherapeuticsThe University of Melbourne Victoria 3010 Australia
- The Florey Institute of Neuroscience and Mental HealthUniversity of Melbourne 30 Royal Parade, Parkville Victoria 3052 Australia
| | - Mohammed Akhter Hossain
- Department of Pharmacology and TherapeuticsThe University of Melbourne Victoria 3010 Australia
- The Florey Institute of Neuroscience and Mental HealthUniversity of Melbourne 30 Royal Parade, Parkville Victoria 3052 Australia
| | - Julien Tailhades
- The Monash Biomedicine Discovery Institute 15 Innovation Walk Clayton VIC 3800 Australia
- EMBL AustraliaMonash University Clayton Victoria 3800 Australia
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16
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Yanase M, Nakatsu K, Cardos CJ, Konda Y, Hayashi G, Okamoto A. Cysteinylprolyl imide (CPI) peptide: a highly reactive and easily accessible crypto-thioester for chemical protein synthesis. Chem Sci 2019; 10:5967-5975. [PMID: 31360403 PMCID: PMC6566460 DOI: 10.1039/c9sc00646j] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 05/09/2019] [Indexed: 12/21/2022] Open
Abstract
A new crypto-thioester, cysteinylprolyl imide (CPI) peptide, offers a practical synthetic pathway and reliable reaction rate to be successfully applied to chemical protein synthesis.
Native chemical ligation (NCL) between the C-terminal peptide thioester and the N-terminal cysteinyl-peptide revolutionized the field of chemical protein synthesis. The difficulty of direct synthesis of the peptide thioester in the Fmoc method has prompted the development of crypto-thioesters that can be efficiently converted into thioesters. Cysteinylprolyl ester (CPE), which is an N–S acyl shift-driven crypto-thioester that relies on an intramolecular O–N acyl shift to displace the amide-thioester equilibrium, enabled trans-thioesterification and subsequent NCL in one pot. However, the utility of CPE is limited because of the moderate thioesterification rates and the synthetic complexity introduced by the ester group. Herein, we develop a new crypto-thioester, cysteinylprolyl imide (CPI), which replaces the alcohol leaving group of CPE with other leaving groups such as benzimidazolidinone, oxazolidinone, and pyrrolidinone. CPI peptides were efficiently synthesized by using standard Fmoc solid-phase peptide synthesis (SPPS) and subsequent on-resin imide formation. Screening of the several imide structures indicated that methyloxazolidinone-t-leucine (MeOxd-Tle) showed faster conversion into thioester and higher stability against hydrolysis under NCL conditions. Finally, by using CPMeOxd-Tle peptides, we demonstrated the chemical synthesis of affibody via N-to-C sequential, three-segment ligation and histone H2A.Z via convergent four-segment ligation. This facile and straightforward method is expected to be broadly applicable to chemical protein synthesis.
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Affiliation(s)
- Masafumi Yanase
- Department of Chemistry and Biotechnology , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-8656 , Japan .
| | - Koki Nakatsu
- Department of Chemistry and Biotechnology , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-8656 , Japan .
| | - Charlane Joy Cardos
- Department of Chemistry and Biotechnology , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-8656 , Japan .
| | - Yoshiki Konda
- Department of Chemistry and Biotechnology , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-8656 , Japan .
| | - Gosuke Hayashi
- Department of Chemistry and Biotechnology , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-8656 , Japan . .,Department of Biomolecular Engineering , Graduate School of Engineering , Nagoya University , Furo-cho, Chikusa-ku , Nagoya 464-8603 , Japan .
| | - Akimitsu Okamoto
- Department of Chemistry and Biotechnology , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-8656 , Japan . .,Research Center for Advanced Science and Technology , The University of Tokyo , 4-6-1 Komaba, Meguro-ku , Tokyo 153-8904 , Japan
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17
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Interaction of Amyloid Aβ(9–16) Peptide Fragment with Metal Ions: CD, FT-IR, and Fluorescence Spectroscopic Studies. Int J Pept Res Ther 2018. [DOI: 10.1007/s10989-018-9738-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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18
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19
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Chen H, Xiao Y, Yuan N, Weng J, Gao P, Breindel L, Shekhtman A, Zhang Q. Coupling of sterically demanding peptides by β-thiolactone-mediated native chemical ligation. Chem Sci 2018; 9:1982-1988. [PMID: 29675245 PMCID: PMC5892351 DOI: 10.1039/c7sc04744d] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 01/02/2018] [Indexed: 12/30/2022] Open
Abstract
The ligation of sterically demanding peptidyl sites such as those involving Val-Val and Val-Pro linkages has proven to be extremely challenging with conventional NCL methods that rely on exogenous thiol additives. Herein, we report an efficient β-thiolactone-mediated additive-free NCL protocol that enables the establishment of these connections in good yield. The rapid NCL was followed by in situ desulfurization. Reaction rates between β-thiolactones and conventional thioesters towards NCL were also investigated, and direct aminolysis was ruled out as a possible pathway. Finally, the potent cytotoxic cyclic-peptide axinastatin 1 has been prepared using the developed methodology.
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Affiliation(s)
- Huan Chen
- Department of Chemistry , University at Albany , State University of New York , 1400 Washington Avenue , Albany , NY 12222 , USA .
| | - Yunxian Xiao
- Department of Chemistry , University at Albany , State University of New York , 1400 Washington Avenue , Albany , NY 12222 , USA .
| | - Ning Yuan
- State Key Laboratory of Natural and Biomimetic Drugs , School of Pharmaceutical Sciences , Peking University , 38 Xueyuan Road , Beijing 100191 , China
| | - Jiaping Weng
- Department of Chemistry , University at Albany , State University of New York , 1400 Washington Avenue , Albany , NY 12222 , USA .
| | - Pengcheng Gao
- Department of Chemistry , University at Albany , State University of New York , 1400 Washington Avenue , Albany , NY 12222 , USA .
| | - Leonard Breindel
- Department of Chemistry , University at Albany , State University of New York , 1400 Washington Avenue , Albany , NY 12222 , USA
| | - Alexander Shekhtman
- Department of Chemistry , University at Albany , State University of New York , 1400 Washington Avenue , Albany , NY 12222 , USA
| | - Qiang Zhang
- Department of Chemistry , University at Albany , State University of New York , 1400 Washington Avenue , Albany , NY 12222 , USA .
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20
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Jiang YY, Liu TT, Zhang RX, Xu ZY, Sun X, Bi S. Mechanism and Rate-Determining Factors of Amide Bond Formation through Acyl Transfer of Mixed Carboxylic–Carbamic Anhydrides: A Computational Study. J Org Chem 2018; 83:2676-2685. [DOI: 10.1021/acs.joc.7b03107] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Yuan-Ye Jiang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Tian-Tian Liu
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Rui-Xue Zhang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Zhong-Yan Xu
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Xue Sun
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Siwei Bi
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
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21
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Meng G, Shi S, Lalancette R, Szostak R, Szostak M. Reversible Twisting of Primary Amides via Ground State N-C(O) Destabilization: Highly Twisted Rotationally Inverted Acyclic Amides. J Am Chem Soc 2018; 140:727-734. [PMID: 29240413 DOI: 10.1021/jacs.7b11309] [Citation(s) in RCA: 141] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Since the seminal studies by Pauling in 1930s, planarity has become the defining characteristic of the amide bond. Planarity of amides has central implications for the reactivity and chemical properties of amides of relevance to a range of chemical disciplines. While the vast majority of amides are planar, nonplanarity has a profound effect on the properties of the amide bond, with the most common method to restrict the amide bond relying on the incorporation of the amide function into a rigid cyclic ring system. In a major departure from this concept, here, we report the first class of acyclic twisted amides that can be prepared, reversibly, from common primary amides in a single, operationally trivial step. Di-tert-butoxycarbonylation of the amide nitrogen atom yields twisted amides in which the amide bond exhibits nearly perpendicular twist. Full structural characterization of a range of electronically diverse compounds from this new class of twisted amides is reported. Through reactivity studies we demonstrate unusual properties of the amide bond, wherein selective cleavage of the amide bond can be achieved by a judicious choice of the reaction conditions. Through computational studies we evaluate structural and energetic details pertaining to the amide bond deformation. The ability to selectively twist common primary amides, in a reversible manner, has important implications for the design and application of the amide bond nonplanarity in structural chemistry, biochemistry and organic synthesis.
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Affiliation(s)
- Guangrong Meng
- Department of Chemistry, Rutgers University , 73 Warren Street, Newark, New Jersey 07102, United States
| | - Shicheng Shi
- Department of Chemistry, Rutgers University , 73 Warren Street, Newark, New Jersey 07102, United States
| | - Roger Lalancette
- Department of Chemistry, Rutgers University , 73 Warren Street, Newark, New Jersey 07102, United States
| | - Roman Szostak
- Department of Chemistry, Wroclaw University , F. Joliot-Curie 14, Wroclaw 50-383, Poland
| | - Michal Szostak
- Department of Chemistry, Rutgers University , 73 Warren Street, Newark, New Jersey 07102, United States
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22
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Jiang YY, Liu TT, Sun X, Xu ZY, Fan X, Zhu L, Bi S. Computational study of the mechanism of amide bond formation via CS2-releasing 1,3-acyl transfer. Org Biomol Chem 2018; 16:5808-5815. [DOI: 10.1039/c8ob01338a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A systematic computational study on CS2-releasing 1,3-acyl transfer was performed for the first time and provided deeper mechanistic insights.
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Affiliation(s)
- Yuan-Ye Jiang
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165
- People's Republic of China
| | - Tian-Tian Liu
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165
- People's Republic of China
| | - Xue Sun
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165
- People's Republic of China
| | - Zhong-Yan Xu
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165
- People's Republic of China
| | - Xia Fan
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165
- People's Republic of China
| | - Ling Zhu
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165
- People's Republic of China
| | - Siwei Bi
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165
- People's Republic of China
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23
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Tailhades J, Schoppet M, Greule A, Peschke M, Brieke C, Cryle MJ. A route to diastereomerically pure phenylglycine thioester peptides: crucial intermediates for investigating glycopeptide antibiotic biosynthesis. Chem Commun (Camb) 2018; 54:2146-2149. [DOI: 10.1039/c7cc09409d] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Non-ribosomal peptides contain an array of amino acid building blocks that can present challenges for the synthesis of important intermediates. Here we report a route to incorporate phenylglycine residues in peptide thioesters without significant racemisation.
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Affiliation(s)
- Julien Tailhades
- EMBL Australia, Monash University
- Clayton
- Australia
- The Monash Biomedicine Discovery Institute
- Department of Biochemistry and Molecular Biology and ARC Centre of Excellence in Advanced Molecular Imaging
| | - Melanie Schoppet
- EMBL Australia, Monash University
- Clayton
- Australia
- The Monash Biomedicine Discovery Institute
- Department of Biochemistry and Molecular Biology and ARC Centre of Excellence in Advanced Molecular Imaging
| | - Anja Greule
- EMBL Australia, Monash University
- Clayton
- Australia
- The Monash Biomedicine Discovery Institute
- Department of Biochemistry and Molecular Biology and ARC Centre of Excellence in Advanced Molecular Imaging
| | - Madeleine Peschke
- Department of Biomolecular Mechanisms
- Max Planck Institute for Medical Research
- Jahnstrasse 29
- Germany
| | - Clara Brieke
- Department of Biomolecular Mechanisms
- Max Planck Institute for Medical Research
- Jahnstrasse 29
- Germany
| | - Max J. Cryle
- EMBL Australia, Monash University
- Clayton
- Australia
- The Monash Biomedicine Discovery Institute
- Department of Biochemistry and Molecular Biology and ARC Centre of Excellence in Advanced Molecular Imaging
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24
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Tailhades J, Takizawa H, Gait MJ, Wellings DA, Wade JD, Aoki Y, Shabanpoor F. Solid-Phase Synthesis of Difficult Purine-Rich PNAs through Selective Hmb Incorporation: Application to the Total Synthesis of Cell Penetrating Peptide-PNAs. Front Chem 2017; 5:81. [PMID: 29094037 PMCID: PMC5651559 DOI: 10.3389/fchem.2017.00081] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Accepted: 09/29/2017] [Indexed: 12/27/2022] Open
Abstract
Antisense oligonucleotide (ASO)-based drug development is gaining significant momentum following the recent FDA approval of Eteplirsen (an ASO based on phosphorodiamidate morpholino) and Spinraza (2′-O-methoxyethyl-phosphorothioate) in late 2016. Their attractiveness is mainly due to the backbone modifications which have improved the in vivo characteristics of oligonucleotide drugs. Another class of ASO, based on peptide nucleic acid (PNA) chemistry, is also gaining popularity as a platform for development of gene-specific therapy for various disorders. However, the chemical synthesis of long PNAs, which are more target-specific, remains an ongoing challenge. Most of the reported methodology for the solid-phase synthesis of PNA suffer from poor coupling efficiency which limits production to short PNA sequences of less than 15 residues. Here, we have studied the effect of backbone modifications with Hmb (2-hydroxy-4-methoxybenzyl) and Dmb (2,4-dimethoxybenzyl) to ameliorate difficult couplings and reduce “on-resin” aggregation. We firstly synthesized a library of PNA dimers incorporating either Hmb or Dmb and identified that Hmb is superior to Dmb in terms of its ease of removal. Subsequently, we used Hmb backbone modification to synthesize a 22-mer purine-rich PNA, targeting dystrophin RNA splicing, which could not be synthesized by standard coupling methodology. Hmb backbone modification allowed this difficult PNA to be synthesized as well as to be continued to include a cell-penetrating peptide on the same solid support. This approach provides a novel and straightforward strategy for facile solid-phase synthesis of difficult purine-rich PNA sequences.
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Affiliation(s)
- Julien Tailhades
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Parkville, VIC, Australia.,Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, Australia
| | - Hotake Takizawa
- Department of Molecular Therapy, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Michael J Gait
- Laboratory of Molecular Biology, Medical Research Council, Cambridge, United Kingdom
| | | | - John D Wade
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Parkville, VIC, Australia.,School of Chemistry, University of Melbourne, Parkville, VIC, Australia
| | - Yoshitsugu Aoki
- Department of Molecular Therapy, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Fazel Shabanpoor
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Parkville, VIC, Australia.,School of Chemistry, University of Melbourne, Parkville, VIC, Australia
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25
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Chou YL, Jhong Y, Swain SP, Hou DR. Microwave-Assisted Direct Thioesterification of Carboxylic Acids. J Org Chem 2017; 82:10201-10208. [PMID: 28875699 DOI: 10.1021/acs.joc.7b01705] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A one-pot synthesis of thioesters directly from carboxylic acids, N,N'-diphenylthiourea, triethylamine, and primary alkyl halides is described. Microwave-assisted heating and a catalytic amount of 4-(dimethylamino)pyridine (DMAP) further improved the yields. Both aromatic and aliphatic carboxylic acids were converted to the corresponding thioesters, and many functional groups were compatible with this reaction. Several possible reaction intermediates were investigated, and the quaternary ammonium salts, derived from alkyl halides and tertiary amines, were the intermediates to yield thioesters. A new reaction mechanism for this thioesterification is proposed.
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Affiliation(s)
- Yen-Lin Chou
- Department of Chemistry, National Central University , No. 300 Jhong-Da Road, Jhong-li, Taoyuan, Taiwan 32001
| | - Yi Jhong
- Department of Chemistry, National Central University , No. 300 Jhong-Da Road, Jhong-li, Taoyuan, Taiwan 32001
| | - Sharada Prasanna Swain
- Department of Chemistry, National Central University , No. 300 Jhong-Da Road, Jhong-li, Taoyuan, Taiwan 32001
| | - Duen-Ren Hou
- Department of Chemistry, National Central University , No. 300 Jhong-Da Road, Jhong-li, Taoyuan, Taiwan 32001
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26
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Shelton PMM, Weller CE, Chatterjee C. A Facile N-Mercaptoethoxyglycinamide (MEGA) Linker Approach to Peptide Thioesterification and Cyclization. J Am Chem Soc 2017; 139:3946-3949. [PMID: 28230996 DOI: 10.1021/jacs.6b13271] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The C-terminal electrophilic activation of peptides by α-thioesterification requires strongly acidic conditions or complex chemical manipulations, which ultimately limit functional group compatibility and broad utility. Herein, we report a readily accessible N-mercaptoethoxyglycinamide (MEGA) solid-phase linker for the facile synthesis of latent peptide α-thioesters. Incubating peptide-MEGA sequences with 2-mercaptoethanesulfonic acid at mildly acidic pH yielded α-thioesters that were directly used in NCL without purification. The MEGA linker yielded robust access to thioesters ranging in length from 4 to 35 amino acids, and greatly simplified the synthesis of cyclic peptides. Finally, the high utility of MEGA was demonstrated by the one-pot synthesis of a functional analog of the Sunflower Trypsin Inhibitor 1.
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Affiliation(s)
- Patrick M M Shelton
- Department of Chemistry, University of Washington , Seattle, Washington 98195, United States
| | - Caroline E Weller
- Department of Chemistry, University of Washington , Seattle, Washington 98195, United States
| | - Champak Chatterjee
- Department of Chemistry, University of Washington , Seattle, Washington 98195, United States
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27
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Ulrich V, Cryle MJ. SNaPe: a versatile method to generate multiplexed protein fusions using synthetic linker peptides for in vitro applications. J Pept Sci 2016; 23:16-27. [PMID: 27910178 DOI: 10.1002/psc.2943] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 10/26/2016] [Accepted: 11/06/2016] [Indexed: 11/10/2022]
Abstract
Understanding the structure and function of protein complexes and multi-domain proteins is highly important in biology, although the in vitro characterization of these systems is often complicated by their size or the transient nature of protein/protein interactions. To assist in the characterization of such protein complexes, we have developed a modular approach to fusion protein generation that relies upon Sortase-mediated and Native chemical ligation using synthetic Peptide linkers (SNaPe) to link two separately expressed proteins. In this approach, we utilize two separate linking steps - sortase-mediated and native chemical ligation - together with a library of peptide linkers to generate libraries of fusion proteins. We have demonstrated the viability of SNaPe to generate libraries from fusion protein constructs taken from the biosynthetic enzymes responsible for late stage aglycone assembly during glycopeptide antibiotic biosynthesis. Crucially, SNaPe was able to generate fusion proteins that are inaccessible via direct expression of the fusion construct itself. This highlights the advantages of SNaPe to not only access fusion proteins that have been previously unavailable for biochemical and structural characterization but also to do so in a manner that enables the linker itself to be controlled as an experimental parameter of fusion protein generation. Copyright © 2016 European Peptide Society and John Wiley & Sons, Ltd.
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Affiliation(s)
- Veronika Ulrich
- Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Jahnstrasse 29, 69120, Heidelberg, Germany
| | - Max J Cryle
- Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Jahnstrasse 29, 69120, Heidelberg, Germany.,EMBL Australia, Monash University, Clayton, Victoria, 3800, Australia.,The Monash Biomedicine Discovery Institute, Department of Biochemistry and Molecular Biology and ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Clayton, Victoria, 3800, Australia
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28
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Abstract
The present review offers an overview of nonclassical (e.g., with no pre- or in situ activation of a carboxylic acid partner) approaches for the construction of amide bonds. The review aims to comprehensively discuss relevant work, which was mainly done in the field in the last 20 years. Organization of the data follows a subdivision according to substrate classes: catalytic direct formation of amides from carboxylic and amines ( section 2 ); the use of carboxylic acid surrogates ( section 3 ); and the use of amine surrogates ( section 4 ). The ligation strategies (NCL, Staudinger, KAHA, KATs, etc.) that could involve both carboxylic acid and amine surrogates are treated separately in section 5 .
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Affiliation(s)
- Renata Marcia de Figueiredo
- Institut Charles Gerhardt de Montpellier (ICGM), UMR 5253-CNRS-UM-ENSCM, Ecole Nationale Supérieure de Chimie , 8 rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France
| | - Jean-Simon Suppo
- Institut Charles Gerhardt de Montpellier (ICGM), UMR 5253-CNRS-UM-ENSCM, Ecole Nationale Supérieure de Chimie , 8 rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France
| | - Jean-Marc Campagne
- Institut Charles Gerhardt de Montpellier (ICGM), UMR 5253-CNRS-UM-ENSCM, Ecole Nationale Supérieure de Chimie , 8 rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France
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29
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Zhang S, Amso Z, De Leon Rodriguez LM, Kaur H, Brimble MA. Synthesis of Natural Cyclopentapeptides Isolated from Dianthus chinensis. JOURNAL OF NATURAL PRODUCTS 2016; 79:1769-1774. [PMID: 27326468 DOI: 10.1021/acs.jnatprod.6b00152] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The first syntheses of the naturally occurring cyclic peptides dianthin I (1), pseudostellarin A (2), and heterophyllin J (3) are described. The linear protected peptide precursors were prepared efficiently via Fmoc-solid-phase synthesis and subsequently cyclized in solution under dilute conditions. The structures of the synthetic cyclopentapeptides were confirmed by NMR spectroscopy and mass spectrometry and were in agreement with the literature data reported for the natural products.
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Affiliation(s)
- Shengping Zhang
- School of Chemical Sciences, The University of Auckland , 23 Symonds Street, Auckland, 1142, New Zealand
| | - Zaid Amso
- School of Chemical Sciences, The University of Auckland , 23 Symonds Street, Auckland, 1142, New Zealand
| | - Luis M De Leon Rodriguez
- Maurice Wilkins Centre for Molecular Biodiscovery, 23 Symonds Street, The University of Auckland, Auckland, 1142, New Zealand
| | - Harveen Kaur
- School of Chemical Sciences, The University of Auckland , 23 Symonds Street, Auckland, 1142, New Zealand
| | - Margaret A Brimble
- School of Chemical Sciences, The University of Auckland , 23 Symonds Street, Auckland, 1142, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, 23 Symonds Street, The University of Auckland, Auckland, 1142, New Zealand
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30
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Cowper B, Shariff L, Chen W, Gibson SM, Di WL, Macmillan D. Expanding the scope of N → S acyl transfer in native peptide sequences. Org Biomol Chem 2016; 13:7469-76. [PMID: 26066020 DOI: 10.1039/c5ob01029b] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding the factors that influence N → S acyl transfer in native peptide sequences, and discovery of new reagents that facilitate it, will be key to expanding its scope and applicability. Here, through a study of short model peptides in thioester formation and cyclisation reactions, we demonstrate that a wider variety of Xaa-Cys motifs than originally envisaged are capable of undergoing efficient N → S acyl transfer. We present data for the relative rates of thioester formation and cyclisation for a representative set of amino acids, and show how this expanded scope can be applied to the production of the natural protease inhibitor Sunflower Trypsin Inhibitor-1 (SFTI-1).
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Affiliation(s)
- Ben Cowper
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
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31
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Hutton CA, Shang J, Wille U. Synthesis of Peptides by Silver-Promoted Coupling of Carboxylates and Thioamides: Mechanistic Insight from Computational Studies. Chemistry 2016; 22:3163-9. [PMID: 26813415 DOI: 10.1002/chem.201503753] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Indexed: 11/05/2022]
Abstract
The mechanism of the recently described N→C direction peptide synthesis through silver-promoted coupling of N-protected amino acids with thioacetylated amino esters was explored by using density functional theory. Calculation of the potential energy surfaces for various pathways revealed that the reaction proceeds through silver-assisted addition of the carboxylate to the thioamide, which is followed by deprotonation and silver-mediated extrusion of sulfur as Ag2 S. The resulting isoimide is the key intermediate, which subsequently rearranges to an imide through a concerted pericyclic [1,3]-acyl shift (O-sp(2) N 1,3-acyl migration). The proposed mechanism clearly emphasises the requirement of two equivalents of Ag(I) and basic reaction conditions, which is in full agreement with the experimental findings. Alternative rearrangement pathways involving only one equivalent of Ag(I) or through O-sp(3) N 1,3-acyl migration can be excluded. The computations further revealed that peptide couplings involving thioformamides require significant conformational changes in the intermediate isoformimide, which slow down the rearrangement process.
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Affiliation(s)
- Craig A Hutton
- School of Chemistry and Bio21 Institute, The University of Melbourne, 30 Flemington Road, Parkville, VIC, 3010, Australia.
| | - Jing Shang
- School of Chemistry and Bio21 Institute, The University of Melbourne, 30 Flemington Road, Parkville, VIC, 3010, Australia
| | - Uta Wille
- School of Chemistry and Bio21 Institute, The University of Melbourne, 30 Flemington Road, Parkville, VIC, 3010, Australia.
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32
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Facile synthesis of C-terminal peptide thioacids under mild conditions from N -sulfanylethylanilide peptides. Tetrahedron 2016. [DOI: 10.1016/j.tet.2015.12.070] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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33
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Tailhades J, Sethi A, Petrie EJ, Gooley PR, Bathgate RA, Wade JD, Hossain MA. Native Chemical Ligation to Minimize Aspartimide Formation during Chemical Synthesis of Small LDLa Protein. Chemistry 2015; 22:1146-51. [PMID: 26612092 DOI: 10.1002/chem.201503599] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Indexed: 12/21/2022]
Abstract
The inhibition of the G protein-coupled receptor, relaxin family peptide receptor 1 (RXFP1), by a small LDLa protein may be a potential approach for prostate cancer treatment. However, it is a significant challenge to chemically produce the 41-residue and three-disulfide cross-bridged LDLa module which is highly prone to aspartimide formation due to the presence of several aspartic acid residues. Known palliative measures, including addition of HOBt to piperidine for N(α) -deprotection, failed to completely overcome this side reaction. For this reason, an elegant native chemical ligation approach was employed in which two segments were assembled for generating the linear LDLa protein. Acquisition of correct folding was achieved by using either a regioselective disulfide bond formation or global oxidation strategies. The final synthetic LDLa protein obtained was characterized by NMR spectroscopic structural analysis after chelation with a Ca(2+) ion and confirmed to be equivalent to the same protein obtained by recombinant DNA production.
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Affiliation(s)
- Julien Tailhades
- Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Victoria, 3010, Australia.
| | - Ashish Sethi
- Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Victoria, 3010, Australia
| | - Emma J Petrie
- Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Victoria, 3010, Australia
| | - Paul R Gooley
- Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Victoria, 3010, Australia
| | - Ross A Bathgate
- Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Victoria, 3010, Australia.,Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Victoria, 3010, Australia
| | - John D Wade
- Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Victoria, 3010, Australia. .,The School of Chemistry, The University of Melbourne, Victoria, 3010, Australia.
| | - Mohammed A Hossain
- Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Victoria, 3010, Australia. .,The School of Chemistry, The University of Melbourne, Victoria, 3010, Australia.
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34
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Stach M, Weidkamp AJ, Yang SH, Hung KY, Furkert DP, Harris PWR, Smaill JB, Patterson AV, Brimble MA. Improved Strategy for the Synthesis of the Anticancer Agent Culicinin D. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500872] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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35
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De Leon Rodriguez LM, Weidkamp AJ, Brimble MA. An update on new methods to synthesize cyclotetrapeptides. Org Biomol Chem 2015; 13:6906-21. [PMID: 26022908 DOI: 10.1039/c5ob00880h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cyclotetrapeptides are important bioactive lead drug molecules that display a wide spectrum of pharmacological activities. However, the synthesis of cyclotetrapeptides from their linear precursors is challenging due to the highly constrained conformation required for cyclisation, thus hampering their progress to a clinical setting. This review provides an account of the reported methods used for the synthesis of cyclotetrapeptides.
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Affiliation(s)
- Luis M De Leon Rodriguez
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Auckland, New Zealand
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