1
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He Y, Takei T, Moroder L, Hojo H. Unexpected diselenide metathesis in selenocysteine-substituted biologically active peptides. Org Biomol Chem 2024. [PMID: 39028035 DOI: 10.1039/d4ob00921e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2024]
Abstract
Substitution of disulfide bonds with a diselenide bonds in peptides and proteins is an often-used strategy to increase the stability of naturally occurring peptides and proteins. In this paper, diselenide metathesis between model diselenide dimer peptides, as well as that in diselenide(s)-substituted biologically active peptides, were analyzed. Surprisingly, depending on the tertiary structure of the peptides, we observed that the metathesis reaction occurs under physiological conditions even in the absence of reducing agents, light and heating.
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Affiliation(s)
- Ying He
- Institute for Protein Research, Osaka University, Osaka 565-0871, Japan.
| | - Toshiki Takei
- Institute for Protein Research, Osaka University, Osaka 565-0871, Japan.
| | - Luis Moroder
- Max-Planck-Institute of Biochemistry, Martinsried 82152, Germany
| | - Hironobu Hojo
- Institute for Protein Research, Osaka University, Osaka 565-0871, Japan.
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2
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Weil-Ktorza O, Dhayalan B, Chen YS, Weiss MA, Metanis N. Se-Glargine: Chemical Synthesis of a Basal Insulin Analogue Stabilized by an Internal Diselenide Bridge. Chembiochem 2024; 25:e202300818. [PMID: 38149322 DOI: 10.1002/cbic.202300818] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 12/21/2023] [Accepted: 12/24/2023] [Indexed: 12/28/2023]
Abstract
Insulin has long provided a model for studies of protein folding and stability, enabling enhanced treatment of diabetes mellitus via analogue design. We describe the chemical synthesis of a basal insulin analogue stabilized by substitution of an internal cystine (A6-A11) by a diselenide bridge. The studies focused on insulin glargine (formulated as Lantus® and Toujeo®; Sanofi). Prepared at pH 4 in the presence of zinc ions, glargine exhibits a shifted isoelectric point due to a basic B chain extension (ArgB31 -ArgB32 ). Subcutaneous injection leads to pH-dependent precipitation of a long-lived depot. Pairwise substitution of CysA6 and CysA11 by selenocysteine was effected by solid-phase peptide synthesis; the modified A chain also contained substitution of AsnA21 by Gly, circumventing acid-catalyzed deamidation. Although chain combination of native glargine yielded negligible product, in accordance with previous synthetic studies, the pairwise selenocysteine substitution partially rescued this reaction: substantial product was obtained through repeated combination, yielding a stabilized insulin analogue. This strategy thus exploited both (a) the unique redox properties of selenocysteine in protein folding and (b) favorable packing of an internal diselenide bridge in the native state, once achieved. Such rational optimization of protein folding and stability may be generalizable to diverse disulfide-stabilized proteins of therapeutic interest.
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Affiliation(s)
- Orit Weil-Ktorza
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel
| | - Balamurugan Dhayalan
- Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Yen-Shan Chen
- Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Michael A Weiss
- Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Norman Metanis
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel
- Casali Center for Applied Chemistry, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel
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3
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Nuti F, Larregola M, Staśkiewicz A, Retzl B, Tomašević N, Macchia L, Street ME, Jewgiński M, Lequin O, Latajka R, Rovero P, Gruber CW, Chorev M, Papini AM. Design, synthesis, conformational analysis, and biological activity of Cα 1-to-Cα 6 1,4- and 4,1-disubstituted 1 H-[1,2,3]triazol-1-yl-bridged oxytocin analogues. J Enzyme Inhib Med Chem 2023; 38:2254019. [PMID: 37735942 PMCID: PMC10519257 DOI: 10.1080/14756366.2023.2254019] [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: 07/29/2023] [Accepted: 08/26/2023] [Indexed: 09/23/2023] Open
Abstract
Oxytocin (OT) is a neurohypophyseal peptide hormone containing a disulphide-bridged pseudocyclic conformation. The biomedical use of OT peptides is limited amongst others by disadvantageous pharmacokinetic parameters. To increase the stability of OT by replacing the disulphide bridge with the stable and more rigid [1,2,3]triazol-1-yl moiety, we employed the Cu2+-catalysed side chain-to-side chain azide-alkyne 1,3-cycloaddition. Here we report the design, synthesis, conformational analysis, and in vitro pharmacological activity of a homologous series of Cα1-to-Cα6 side chain-to-side chain [1,2,3]triazol-1-yl-containing OT analogues differing in the length of the bridge, location, and orientation of the linking moiety. Exploiting this macrocyclisation approach, it was possible to generate a systematic series of compounds providing interesting insight into the structure-conformation-function relationship of OT. Most analogues were able to adopt similar conformation to endogenous OT in water, namely, a type I β-turn. This approach may in the future generate stabilised pharmacological peptide tools to advance understanding of OT physiology.
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Affiliation(s)
- Francesca Nuti
- Interdepartmental Research Unit of Peptide and Protein Chemistry and Biology, Department of Chemistry “Ugo Schiff”, University of Florence, Sesto Fiorentino, Florence, Italy
| | - Maud Larregola
- CNRS, BioCIS, CY Cergy Paris Université, Cergy Pontoise and Paris Saclay Université, Orsay, France
| | - Agnieszka Staśkiewicz
- Interdepartmental Research Unit of Peptide and Protein Chemistry and Biology, Department of Chemistry “Ugo Schiff”, University of Florence, Sesto Fiorentino, Florence, Italy
- Department of Bioorganic Chemistry, Faculty of Chemistry, Wrocław University of Science and Technology, Wrocław, Poland
| | - Bernhard Retzl
- Institute of Pharmacology, Center for Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria
| | - Nataša Tomašević
- Institute of Pharmacology, Center for Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria
| | - Lorenzo Macchia
- Interdepartmental Research Unit of Peptide and Protein Chemistry and Biology, Department of Chemistry “Ugo Schiff”, University of Florence, Sesto Fiorentino, Florence, Italy
| | - Maria E. Street
- Dipartimento di Medicina e Chirurgia, Università di Parma e Clinica Pediatrica, AOU di Parma, Parma, Italy
| | - Michał Jewgiński
- Department of Bioorganic Chemistry, Faculty of Chemistry, Wrocław University of Science and Technology, Wrocław, Poland
| | - Olivier Lequin
- Laboratoire des Biomolécules, Sorbonne Université, Ecole Normale Supérieure, PSL University, CNRS, Paris, France
| | - Rafal Latajka
- Department of Bioorganic Chemistry, Faculty of Chemistry, Wrocław University of Science and Technology, Wrocław, Poland
| | - Paolo Rovero
- Interdepartmental Research Unit of Peptide and Protein Chemistry and Biology, Department of NeuroFarBa, University of Florence, Sesto Fiorentino, Florence, Italy
| | - Christian W. Gruber
- Institute of Pharmacology, Center for Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria
| | - Michael Chorev
- Laboratory for Translational Research, Department of Medicine, Division of Hematology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, USA
| | - Anna Maria Papini
- Interdepartmental Research Unit of Peptide and Protein Chemistry and Biology, Department of Chemistry “Ugo Schiff”, University of Florence, Sesto Fiorentino, Florence, Italy
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4
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Wang P, Chen B, Huang Y, Li J, Cao D, Chen Z, Li J, Ran B, Yang J, Wang R, Wei Q, Dong Q, Liu L. Selenium intake and multiple health-related outcomes: an umbrella review of meta-analyses. Front Nutr 2023; 10:1263853. [PMID: 37781125 PMCID: PMC10534049 DOI: 10.3389/fnut.2023.1263853] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 08/28/2023] [Indexed: 10/03/2023] Open
Abstract
Selenium is an essential trace metalloid element that is associated with fundamental importance to human health. Our umbrella review aimed to evaluate the quality of evidence, validity, and biases in the relationship between selenium intake and health-related outcomes according to published systematic reviews with pooled data and meta-analyses. Selenium intake is associated with a decreased risk of digestive system cancers, all-cause mortality, depression, and Keshan disease, when in children reduce the risk of Kashin-Beck disease. Additionally, selenium supplementation can improve sperm quality, polycystic ovary syndrome, autoimmune thyroid disease, cardiovascular disease, and infective outcomes. Selenium supplementation also has relationship with a decreased concentration of serum lipids including total cholesterol and very low-density lipoprotein cholesterol. However, no evidence has shown that selenium is associated with better outcomes among patients in intensive care units. Furthermore, selenium intake may be related with a higher risk of type 2 diabetes and non-melanoma skin cancers. Moreover, most of included studies are evaluated as low quality according to our evidence assessment. Based on our study findings and the limited advantages of selenium intake, it is not recommended to receive extra supplementary selenium for general populations, and selenium supplementation should not be continued in patients whose selenium-deficient status has been corrected.
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Affiliation(s)
- Puze Wang
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Bo Chen
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Yin Huang
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Jin Li
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Dehong Cao
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Zeyu Chen
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Jinze Li
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Biao Ran
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Jiahao Yang
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Ruyi Wang
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
- Department of Urology, Hospital of Chengdu University, Chengdu, China
| | - Qiang Wei
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Qiang Dong
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Liangren Liu
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
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5
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Pehlivan Ö, Waliczek M, Kijewska M, Stefanowicz P. Selenium in Peptide Chemistry. Molecules 2023; 28:molecules28073198. [PMID: 37049961 PMCID: PMC10096412 DOI: 10.3390/molecules28073198] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 03/29/2023] [Accepted: 04/02/2023] [Indexed: 04/07/2023] Open
Abstract
In recent years, researchers have been exploring the potential of incorporating selenium into peptides, as this element possesses unique properties that can enhance the reactivity of these compounds. Selenium is a non-metallic element that has a similar electronic configuration to sulfur. However, due to its larger atomic size and lower electronegativity, it is more nucleophilic than sulfur. This property makes selenium more reactive toward electrophiles. One of the most significant differences between selenium and sulfur is the dissociation of the Se-H bond. The Se-H bond is more easily dissociated than the S-H bond, leading to higher acidity of selenocysteine (Sec) compared to cysteine (Cys). This difference in acidity can be exploited to selectively modify the reactivity of peptides containing Sec. Furthermore, Se-H bonds in selenium-containing peptides are more susceptible to oxidation than their sulfur analogs. This property can be used to selectively modify the peptides by introducing new functional groups, such as disulfide bonds, which are important for protein folding and stability. These unique properties of selenium-containing peptides have found numerous applications in the field of chemical biology. For instance, selenium-containing peptides have been used in native chemical ligation (NCL). In addition, the reactivity of Sec can be harnessed to create cyclic and stapled peptides. Other chemical modifications, such as oxidation, reduction, and photochemical reactions, have also been applied to selenium-containing peptides to create novel molecules with unique biological properties.
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Affiliation(s)
- Özge Pehlivan
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Mateusz Waliczek
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Monika Kijewska
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Piotr Stefanowicz
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
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6
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Reddy KA, Sahoo DK, Moi S, Gowd KH. Conformational change due to replacement of disulfide with selenosulfide and diselenide in dipeptide vicinal cysteine loop. Comput Biol Chem 2022; 97:107635. [DOI: 10.1016/j.compbiolchem.2022.107635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 12/21/2021] [Accepted: 01/17/2022] [Indexed: 11/16/2022]
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7
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Chung CZ, Krahn N, Crnković A, Söll D. Intein-based Design Expands Diversity of Selenocysteine Reporters. J Mol Biol 2021; 434:167199. [PMID: 34411545 PMCID: PMC8847544 DOI: 10.1016/j.jmb.2021.167199] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 07/28/2021] [Accepted: 08/04/2021] [Indexed: 12/27/2022]
Abstract
The presence of selenocysteine in a protein confers many unique properties that make the production of recombinant selenoproteins desirable. Targeted incorporation of Sec into a protein of choice is possible by exploiting elongation factor Tu-dependent reassignment of UAG codons, a strategy that has been continuously improved by a variety of means. Improving selenoprotein yield by directed evolution requires selection and screening markers that are titratable, have a high dynamic range, enable high-throughput screening, and can discriminate against nonspecific UAG decoding. Current screening techniques are limited to a handful of reporters where a cysteine (Cys) or Sec residue normally affords activity. Unfortunately, these existing Cys/Sec-dependent reporters lack the dynamic range of more ubiquitous reporters or suffer from other limitations. Here we present a versatile strategy to adapt established reporters for specific Sec incorporation. Inteins are intervening polypeptides that splice themselves from the precursor protein in an autocatalytic splicing reaction. Using an intein that relies exclusively on Sec for splicing, we show that this intein cassette can be placed in-frame within selection and screening markers, affording reporter activity only upon successful intein splicing. Furthermore, because functional splicing can only occur when a catalytic Sec is present, the amount of synthesized reporter directly measures UAG-directed Sec incorporation. Importantly, we show that results obtained with intein-containing reporters are comparable to the Sec incorporation levels determined by mass spectrometry of isolated recombinant selenoproteins. This result validates the use of these intein-containing reporters to screen for evolved components of a translation system yielding increased selenoprotein amounts.
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Affiliation(s)
- Christina Z Chung
- Department of Molecular Biophysics and Biochemistry, Yale University, 266 Whitney Avenue, New Haven, CT 06511, USA.
| | - Natalie Krahn
- Department of Molecular Biophysics and Biochemistry, Yale University, 266 Whitney Avenue, New Haven, CT 06511, USA.
| | - Ana Crnković
- Department of Molecular Biophysics and Biochemistry, Yale University, 266 Whitney Avenue, New Haven, CT 06511, USA.
| | - Dieter Söll
- Department of Molecular Biophysics and Biochemistry, Yale University, 266 Whitney Avenue, New Haven, CT 06511, USA; Department of Chemistry, Yale University, 225 Prospect Street, New Haven, CT 06511, USA.
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8
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Diselenide crosslinks for enhanced and simplified oxidative protein folding. Commun Chem 2021; 4:30. [PMID: 36697775 PMCID: PMC9814483 DOI: 10.1038/s42004-021-00463-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Accepted: 01/29/2021] [Indexed: 01/28/2023] Open
Abstract
The in vitro oxidative folding of proteins has been studied for over sixty years, providing critical insight into protein folding mechanisms. Hirudin, the most potent natural inhibitor of thrombin, is a 65-residue protein with three disulfide bonds, and is viewed as a folding model for a wide range of disulfide-rich proteins. Hirudin's folding pathway is notorious for its highly heterogeneous intermediates and scrambled isomers, limiting its folding rate and yield in vitro. Aiming to overcome these limitations, we undertake systematic investigation of diselenide bridges at native and non-native positions and investigate their effect on hirudin's folding, structure and activity. Our studies demonstrate that, regardless of the specific positions of these substitutions, the diselenide crosslinks enhanced the folding rate and yield of the corresponding hirudin analogues, while reducing the complexity and heterogeneity of the process. Moreover, crystal structure analysis confirms that the diselenide substitutions maintained the overall three-dimensional structure of the protein and left its function virtually unchanged. The choice of hirudin as a study model has implications beyond its specific folding mechanism, demonstrating the high potential of diselenide substitutions in the design, preparation and characterization of disulfide-rich proteins.
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9
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Arai K, Iwaoka M. Flexible Folding: Disulfide-Containing Peptides and Proteins Choose the Pathway Depending on the Environments. Molecules 2021; 26:E195. [PMID: 33401729 PMCID: PMC7794709 DOI: 10.3390/molecules26010195] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Revised: 12/24/2020] [Accepted: 12/29/2020] [Indexed: 11/18/2022] Open
Abstract
In the last few decades, development of novel experimental techniques, such as new types of disulfide (SS)-forming reagents and genetic and chemical technologies for synthesizing designed artificial proteins, is opening a new realm of the oxidative folding study where peptides and proteins can be folded under physiologically more relevant conditions. In this review, after a brief overview of the historical and physicochemical background of oxidative protein folding study, recently revealed folding pathways of several representative peptides and proteins are summarized, including those having two, three, or four SS bonds in the native state, as well as those with odd Cys residues or consisting of two peptide chains. Comparison of the updated pathways with those reported in the early years has revealed the flexible nature of the protein folding pathways. The significantly different pathways characterized for hen-egg white lysozyme and bovine milk α-lactalbumin, which belong to the same protein superfamily, suggest that the information of protein folding pathways, not only the native folded structure, is encoded in the amino acid sequence. The application of the flexible pathways of peptides and proteins to the engineering of folded three-dimensional structures is an interesting and important issue in the new realm of the current oxidative protein folding study.
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Affiliation(s)
| | - Michio Iwaoka
- Department of Chemistry, School of Science, Tokai University, Kitakaname, Hiratsuka-shi, Kanagawa 259-1292, Japan;
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10
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Takei T, Ando T, Takao T, Ohnishi Y, Kurisu G, Iwaoka M, Hojo H. Chemical synthesis of ferredoxin with 4 selenocysteine residues using a segment condensation method. Chem Commun (Camb) 2020; 56:14239-14242. [PMID: 33118552 DOI: 10.1039/d0cc06252a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ferredoxin (Fd) is an electron carrier protein containing a [2Fe-2S] cluster. In this paper, we synthesized Se-Fd, in which four Cys residues coordinated to the cluster are substituted to selenocysteine. After the one-pot segment coupling by the thioester method, followed by deprotection and cluster loading, the desired Se-Fd was successfully obtained.
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Affiliation(s)
- Toshiki Takei
- Institute for Protein Research, Osaka University, Osaka 565-0871, Japan.
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11
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Qi Y, Qu Q, Bierer D, Liu L. A Diaminodiacid (DADA) Strategy for the Development of Disulfide Surrogate Peptides. Chem Asian J 2020; 15:2793-2802. [DOI: 10.1002/asia.202000609] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 07/17/2020] [Indexed: 11/07/2022]
Affiliation(s)
- Yun‐Kun Qi
- Department of Medicinal Chemistry School of Pharmacy Qingdao University Qingdao 266021 China
- Tsinghua-Peking Center for Life Sciences Ministry of Education Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology Center for Synthetic and Systems Biology Department of Chemistry Tsinghua University Beijing 100084 China
| | - Qian Qu
- Tsinghua-Peking Center for Life Sciences Ministry of Education Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology Center for Synthetic and Systems Biology Department of Chemistry Tsinghua University Beijing 100084 China
| | - Donald Bierer
- Bayer AG Department of Medicinal Chemistry Aprather Weg 18A 42096 Wuppertal Germany
| | - Lei Liu
- Tsinghua-Peking Center for Life Sciences Ministry of Education Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology Center for Synthetic and Systems Biology Department of Chemistry Tsinghua University Beijing 100084 China
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12
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Kennedy AC, Belgi A, Husselbee BW, Spanswick D, Norton RS, Robinson AJ. α-Conotoxin Peptidomimetics: Probing the Minimal Binding Motif for Effective Analgesia. Toxins (Basel) 2020; 12:E505. [PMID: 32781580 PMCID: PMC7472027 DOI: 10.3390/toxins12080505] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 07/29/2020] [Accepted: 08/03/2020] [Indexed: 12/18/2022] Open
Abstract
Several analgesic α-conotoxins have been isolated from marine cone snails. Structural modification of native peptides has provided potent and selective analogues for two of its known biological targets-nicotinic acetylcholine and γ-aminobutyric acid (GABA) G protein-coupled (GABAB) receptors. Both of these molecular targets are implicated in pain pathways. Despite their small size, an incomplete understanding of the structure-activity relationship of α-conotoxins at each of these targets has hampered the development of therapeutic leads. This review scrutinises the N-terminal domain of the α-conotoxin family of peptides, a region defined by an invariant disulfide bridge, a turn-inducing proline residue and multiple polar sidechain residues, and focusses on structural features that provide analgesia through inhibition of high-voltage-activated Ca2+ channels. Elucidating the bioactive conformation of this region of these peptides may hold the key to discovering potent drugs for the unmet management of debilitating chronic pain associated with a wide range of medical conditions.
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Affiliation(s)
- Adam C. Kennedy
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia; (A.C.K.); (A.B.); (B.W.H.)
| | - Alessia Belgi
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia; (A.C.K.); (A.B.); (B.W.H.)
| | - Benjamin W. Husselbee
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia; (A.C.K.); (A.B.); (B.W.H.)
| | - David Spanswick
- Biomedicine Discovery Institute and the Department of Physiology, Monash University, Victoria 3800, Australia;
- Warwick Medical School, University of Warwick, Coventry CV4 7AL, UK
- NeuroSolutions Ltd., Coventry CV4 7AL, UK
| | - Raymond S. Norton
- Medicinal Chemistry, Monash Institute of Pharmaceutical Science, Monash University, 381 Royal Parade, Parkville, Victoria 3052, Australia;
- ARC Centre for Fragment-Based Design, Monash University, Parkville, Victoria 3052, Australia
| | - Andrea J. Robinson
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia; (A.C.K.); (A.B.); (B.W.H.)
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13
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Zhao R, Shi P, Chen J, Sun S, Chen J, Cui J, Wu F, Fang G, Tian C, Shi J, Bierer D, Liu L, Li YM. Chemical synthesis and biological activity of peptides incorporating an ether bridge as a surrogate for a disulfide bond. Chem Sci 2020; 11:7927-7932. [PMID: 34094161 PMCID: PMC8163063 DOI: 10.1039/d0sc02374d] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Disulfide bridges contribute to the definition and rigidity of polypeptides, but they are inherently unstable in reducing environments and in the presence of isomerases and nucleophiles. Strategies to address these deficiencies, ideally without significantly perturbing the structure of the polypeptide, would be of great interest. One possible surrogate for the disulfide bridge is a simple thioether, but these are susceptible to oxidation. We report the introduction of an ether linkage into the biologically active, disulfide-rich peptides oxytocin, tachyplesin I, and conotoxin α-ImI, using an ether-containing diaminodiacid as the key building block, obtained by the stereoselective ring-opening addition reaction of an aziridine skeleton with a hydroxy group. NMR studies indicated that the derivatives with an ether surrogate bridge exhibited very small change of their three-dimensional structures. The analogs obtained using this novel substitution strategy were found to be more stable than the original peptide in oxidative and reductive conditions; without a loss of bioactivity. This strategy is therefore proposed as a practical and versatile solution to the stability problems associated with cysteine-rich peptides. We report the first introduction of an ether linkage as surrogate into the disulfide-rich peptides using ether-containing diaminodiacid.![]()
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Affiliation(s)
- Rui Zhao
- Hefei National Laboratory of Physical Sciences at Microscale, Department of Chemistry, School of Life Sciences, University of Science and Technology of China Hefei Anhui 230009 China .,School of Food and Biological Engineering, Hefei University of Technology Hefei Anhui 230009 China
| | - Pan Shi
- Hefei National Laboratory of Physical Sciences at Microscale, Department of Chemistry, School of Life Sciences, University of Science and Technology of China Hefei Anhui 230009 China
| | - Junyou Chen
- School of Food and Biological Engineering, Hefei University of Technology Hefei Anhui 230009 China
| | - Shuaishuai Sun
- School of Food and Biological Engineering, Hefei University of Technology Hefei Anhui 230009 China
| | - Jingnan Chen
- School of Food and Biological Engineering, Hefei University of Technology Hefei Anhui 230009 China
| | - Jibin Cui
- School of Food and Biological Engineering, Hefei University of Technology Hefei Anhui 230009 China
| | - Fangming Wu
- High Magnetic Field Laboratory, Chinese Academy of Sciences Hefei 230031 China
| | - Gemin Fang
- School of Life Science, Institute of Physical Science and Information Technology, Anhui University Hefei 230601 China
| | - Changlin Tian
- Hefei National Laboratory of Physical Sciences at Microscale, Department of Chemistry, School of Life Sciences, University of Science and Technology of China Hefei Anhui 230009 China
| | - Jing Shi
- Hefei National Laboratory of Physical Sciences at Microscale, Department of Chemistry, School of Life Sciences, University of Science and Technology of China Hefei Anhui 230009 China
| | - Donald Bierer
- Department of Medicinal Chemistry, Bayer AG Aprather Weg 18A 42096 Wuppertal Germany
| | - Lei Liu
- Department of Chemistry, Tsinghua University Beijing 100084 China
| | - Yi-Ming Li
- School of Food and Biological Engineering, Hefei University of Technology Hefei Anhui 230009 China
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14
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Dolle A, Reddy KKA, Gunaga SS, Krishnamurthy K, Senapati DK, Rana A, Sindogi K, Biswal HS, Raghothama S, Gowd KH. Characterization of (Boc-Cys/Sec-NHMe) 2 and (Boc-Cys/Sec-OMe) 2 : Evidence of local conformational difference between disulfide and diselenide. J Pept Sci 2020; 26:e3245. [PMID: 32103604 DOI: 10.1002/psc.3245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Revised: 02/11/2020] [Accepted: 02/11/2020] [Indexed: 11/11/2022]
Abstract
Conformations of disulfide and diselenide were compared in (Boc-Cys/Sec-NHMe)2 and (Boc-Cys/Sec-OMe)2 using X-ray crystallography, nuclear magnetic resonance (NMR) spectroscopy, density functional theory (DFT), and circular dichroism (CD) spectroscopy. Conformations of disulfide/diselenide in polypeptides are defined based on the sign of side chain torsion angle χ3 (-CH2 -S/Se-S/Se-CH2 -); negative indicates left-handed and positive indicates right-handed orientation. In the crystals of (Boc-Cys-OMe)2 and (Boc-Sec-OMe)2 , the disulfide exhibits a left-handed and the diselenide a right-handed orientation. Characterization of cystine and selenocystine derivatives in solution using 1 H-NMR, natural abundant 77 Se NMR, 2D-ROESY, and chemical shift analysis coupled to DMSO titration has indicated the symmetrical nature and antiparallel orientation of Cys/Sec residues about the disulfide/diselenide bridges. Structural calculations of cystine and selenocystine derivatives using DFT further support the antiparallel orientation of Cys/Sec residues about disulfide/diselenide. The far-ultraviolet (UV) region CD spectra of cystine and selenocystine derivatives have exhibited the negative Cotton effect (CE) for disulfide and positive for diselenide confirming the difference in the conformational preference of disulfide and diselenide. In the previously reported polymorphic structure of (Boc-Sec-OMe)2 , the diselenide has right-handed orientation. In the X-ray structures of disulfide and diselenide analogues of Escherichia coli protein encoded by curli specific gene C (CgsC) retrieved from Protein Databank (PDB), disulfide has left-handed and the diselenide right-handed orientation. The current report provides the evidence for the local conformational difference between a disulfide and a diselenide group under unconstrained conditions, which may be useful for the rational replacement of disulfide by diselenide in polypeptide chains.
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Affiliation(s)
- Ashwini Dolle
- Department of Chemistry, School of Chemical Sciences, Central University of Karnataka, Kalaburagi, Karnataka, India
| | - K Kasi Amarnath Reddy
- Department of Chemistry, School of Chemical Sciences, Central University of Karnataka, Kalaburagi, Karnataka, India
| | - Shubha Shridhar Gunaga
- Solid State and Structural Chemistry Unit (SSCU), Indian Institute of Science, Bangalore, Karnataka, India
| | - Kiran Krishnamurthy
- NMR Research Centre, Indian Institute of Science, Bangalore, Karnataka, India
| | | | - Abhijit Rana
- School of Chemical Sciences, NISER, Bhubaneswar, Odisha, India
| | - Kishorkumar Sindogi
- Solid State and Structural Chemistry Unit (SSCU), Indian Institute of Science, Bangalore, Karnataka, India
| | | | | | - Konkallu Hanumae Gowd
- Department of Chemistry, School of Chemical Sciences, Central University of Karnataka, Kalaburagi, Karnataka, India
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15
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Moroder L, Musiol H. Amino acid chalcogen analogues as tools in peptide and protein research. J Pept Sci 2019; 26:e3232. [DOI: 10.1002/psc.3232] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 10/16/2019] [Accepted: 10/21/2019] [Indexed: 12/19/2022]
Affiliation(s)
- Luis Moroder
- Bioorganic ChemistryMax‐Planck Institute of Biochemistry Martinsried Germany
| | - Hans‐Jürgen Musiol
- Bioorganic ChemistryMax‐Planck Institute of Biochemistry Martinsried Germany
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16
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Gokula RP, Mahato J, Singh HB, Chowdhury A. Self-assembly of penta-selenopeptides into amyloid fibrils. Chem Commun (Camb) 2018; 54:11697-11700. [PMID: 30255865 DOI: 10.1039/c8cc06528d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Here, we report the synthesis of a penta-selenopeptide consisting of five benzyl protected selenocysteine residues. This selenopeptide was well characterized by both one- and two-dimensional (D) NMR spectroscopies. We find that the solution conformation is enriched with β-sheet structures, which have a propensity to self-assemble and form amyloid fibrils.
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Affiliation(s)
- Ram P Gokula
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
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17
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Barage SH, Deobagkar DD, Baladhye VB. Characterization of structural and functional role of selenocysteine in selenoprotein H and its impact on DNA binding. Amino Acids 2018; 50:593-607. [DOI: 10.1007/s00726-018-2543-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 02/15/2018] [Indexed: 12/13/2022]
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18
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Structure-based development of an osteoprotegerin-like glycopeptide that blocks RANKL/RANK interactions and reduces ovariectomy-induced bone loss in mice. Eur J Med Chem 2018; 145:661-672. [DOI: 10.1016/j.ejmech.2018.01.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 01/03/2018] [Accepted: 01/08/2018] [Indexed: 01/08/2023]
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19
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Mousa R, Notis Dardashti R, Metanis N. Selen und Selenocystein in der Proteinchemie. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201706876] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Reem Mousa
- The Institute of Chemistry; The Hebrew University of Jerusalem; Edmond J. Safra, Givat Ram Jerusalem 91904 Israel
| | - Rebecca Notis Dardashti
- The Institute of Chemistry; The Hebrew University of Jerusalem; Edmond J. Safra, Givat Ram Jerusalem 91904 Israel
| | - Norman Metanis
- The Institute of Chemistry; The Hebrew University of Jerusalem; Edmond J. Safra, Givat Ram Jerusalem 91904 Israel
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20
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Mousa R, Notis Dardashti R, Metanis N. Selenium and Selenocysteine in Protein Chemistry. Angew Chem Int Ed Engl 2017; 56:15818-15827. [PMID: 28857389 DOI: 10.1002/anie.201706876] [Citation(s) in RCA: 115] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Indexed: 01/22/2023]
Abstract
Selenocysteine, the selenium-containing analogue of cysteine, is the twenty-first proteinogenic amino acid. Since its discovery almost fifty years ago, it has been exploited in unnatural systems even more often than in natural systems. Selenocysteine chemistry has attracted the attention of many chemists in the field of chemical biology owing to its high reactivity and resulting potential for various applications such as chemical modification, chemical protein (semi)synthesis, and protein folding, to name a few. In this Minireview, we will focus on the chemistry of selenium and selenocysteine and their utility in protein chemistry.
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Affiliation(s)
- Reem Mousa
- The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra, Givat Ram, Jerusalem, 91904, Israel
| | - Rebecca Notis Dardashti
- The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra, Givat Ram, Jerusalem, 91904, Israel
| | - Norman Metanis
- The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra, Givat Ram, Jerusalem, 91904, Israel
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21
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Gori A, Gagni P, Rinaldi S. Disulfide Bond Mimetics: Strategies and Challenges. Chemistry 2017; 23:14987-14995. [PMID: 28749012 DOI: 10.1002/chem.201703199] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Indexed: 12/25/2022]
Abstract
The activity profile of many biologically relevant proteins and peptides often relies on a precise 3D structural organization. In this context, disulfide bonds are natural covalent constraints that play a key role in driving and stabilizing the folding pattern of these molecules. Despite its prominent significance as structural motif, the disulfide bond itself is inherently unstable under physiological conditions, posing a major limit to the use and development of disulfide-rich peptides and proteins as molecular tools and drug lead compounds. To tackle this restriction, disulfide engineering with stable functional analogues has arisen a considerable interest. Here, the most popular approaches to disulfide replacement are reviewed and discussed with particular emphasis on advantages and limitations under both functional and synthetic perspectives.
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Affiliation(s)
- Alessandro Gori
- Istituto di Chimica del Riconoscimento Molecolare (ICRM), National Research Council of, Italy) (CNR, via Mario Bianco 9, 20131, Milano, Italy
| | - Paola Gagni
- Istituto di Chimica del Riconoscimento Molecolare (ICRM), National Research Council of, Italy) (CNR, via Mario Bianco 9, 20131, Milano, Italy
| | - Silvia Rinaldi
- Istituto di Chimica del Riconoscimento Molecolare (ICRM), National Research Council of, Italy) (CNR, via Mario Bianco 9, 20131, Milano, Italy
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22
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Arai K, Takei T, Okumura M, Watanabe S, Amagai Y, Asahina Y, Moroder L, Hojo H, Inaba K, Iwaoka M. Preparation of Selenoinsulin as a Long‐Lasting Insulin Analogue. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701654] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Kenta Arai
- Department of Chemistry School of Science Tokai University Kitakaname, Hiratsuka-shi Kanagawa 259-1292 Japan
| | - Toshiki Takei
- Department of Chemistry School of Science Tokai University Kitakaname, Hiratsuka-shi Kanagawa 259-1292 Japan
- Institute for Protein Research Osaka University Yamadaoka, Suita-shi Osaka 565-0871 Japan
| | - Masaki Okumura
- Institute of Multidisciplinary Research for Advanced Materials Tohoku University Aoba-ku Sendai 2-1-1 Japan
| | - Satoshi Watanabe
- Institute of Multidisciplinary Research for Advanced Materials Tohoku University Aoba-ku Sendai 2-1-1 Japan
| | - Yuta Amagai
- Institute of Multidisciplinary Research for Advanced Materials Tohoku University Aoba-ku Sendai 2-1-1 Japan
| | - Yuya Asahina
- Institute for Protein Research Osaka University Yamadaoka, Suita-shi Osaka 565-0871 Japan
| | - Luis Moroder
- Max Planck Institute of Biochemistry Am Klopferspitz 18 82152 Martinsried Germany
| | - Hironobu Hojo
- Institute for Protein Research Osaka University Yamadaoka, Suita-shi Osaka 565-0871 Japan
| | - Kenji Inaba
- Institute of Multidisciplinary Research for Advanced Materials Tohoku University Aoba-ku Sendai 2-1-1 Japan
| | - Michio Iwaoka
- Department of Chemistry School of Science Tokai University Kitakaname, Hiratsuka-shi Kanagawa 259-1292 Japan
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23
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Arai K, Takei T, Okumura M, Watanabe S, Amagai Y, Asahina Y, Moroder L, Hojo H, Inaba K, Iwaoka M. Preparation of Selenoinsulin as a Long-Lasting Insulin Analogue. Angew Chem Int Ed Engl 2017; 56:5522-5526. [PMID: 28394477 DOI: 10.1002/anie.201701654] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 03/21/2017] [Indexed: 01/06/2023]
Abstract
Synthetic insulin analogues with a long lifetime are current drug targets for the therapy of diabetic patients. The replacement of the interchain disulfide with a diselenide bridge, which is more resistant to reduction and internal bond rotation, can enhance the lifetime of insulin in the presence of the insulin-degrading enzyme (IDE) without impairing the hormonal function. The [C7UA ,C7UB ] variant of bovine pancreatic insulin (BPIns) was successfully prepared by using two selenocysteine peptides (i.e., the C7U analogues of A- and B-chains, respectively). In a buffer solution at pH 10 they spontaneously assembled under thermodynamic control to the correct insulin fold. The selenoinsulin (Se-Ins) exhibited a bioactivity comparable to that of BPIns. Interestingly, degradation of Se-Ins with IDE was significantly decelerated (τ1/2 ≈8 h vs. ≈1 h for BPIns). The lifetime enhancement could be due to both the intrinsic stability of the diselenide bond and local conformational changes induced by the substitution.
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Affiliation(s)
- Kenta Arai
- Department of Chemistry, School of Science, Tokai University, Kitakaname, Hiratsuka-shi, Kanagawa, 259-1292, Japan
| | - Toshiki Takei
- Department of Chemistry, School of Science, Tokai University, Kitakaname, Hiratsuka-shi, Kanagawa, 259-1292, Japan.,Institute for Protein Research, Osaka University, Yamadaoka, Suita-shi, Osaka, 565-0871, Japan
| | - Masaki Okumura
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Sendai, 2-1-1, Japan
| | - Satoshi Watanabe
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Sendai, 2-1-1, Japan
| | - Yuta Amagai
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Sendai, 2-1-1, Japan
| | - Yuya Asahina
- Institute for Protein Research, Osaka University, Yamadaoka, Suita-shi, Osaka, 565-0871, Japan
| | - Luis Moroder
- Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152, Martinsried, Germany
| | - Hironobu Hojo
- Institute for Protein Research, Osaka University, Yamadaoka, Suita-shi, Osaka, 565-0871, Japan
| | - Kenji Inaba
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Sendai, 2-1-1, Japan
| | - Michio Iwaoka
- Department of Chemistry, School of Science, Tokai University, Kitakaname, Hiratsuka-shi, Kanagawa, 259-1292, Japan
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24
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Dmab/ivDde protected diaminodiacids for solid-phase synthesis of peptide disulfide-bond mimics. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.03.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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25
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Molecular Engineering of Conus Peptides as Therapeutic Leads. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 1030:229-254. [DOI: 10.1007/978-3-319-66095-0_10] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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26
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Gleeson EC, Wang ZJ, Robinson SD, Chhabra S, MacRaild CA, Jackson WR, Norton RS, Robinson AJ. Stereoselective synthesis and structural elucidation of dicarba peptides. Chem Commun (Camb) 2016; 52:4446-9. [PMID: 26892179 DOI: 10.1039/c5cc10540d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A facile stereoselective synthesis of cis and trans unsaturated dicarba peptides has been established using preformed diaminosuberic acid derivatives as bridging units. In addition, characteristic spectral differences in the (13)C-NMR spectra of the cis- and trans-isomers show that the chemical shift of carbons in the Δ4,5-diaminosuberic acid residue can be used to assign stereochemistry in unsaturated dicarba peptides formed from ring closing metathesis of linear peptide sequences.
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Affiliation(s)
- Ellen C Gleeson
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia.
| | - Zhen J Wang
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia.
| | - Samuel D Robinson
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville 3052, Victoria, Australia
| | - Sandeep Chhabra
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville 3052, Victoria, Australia
| | - Christopher A MacRaild
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville 3052, Victoria, Australia
| | - W Roy Jackson
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia.
| | - Raymond S Norton
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville 3052, Victoria, Australia
| | - Andrea J Robinson
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia.
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27
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Wu X, Huang Y, Kaas Q, Craik DJ. Cyclisation of Disulfide‐Rich Conotoxins in Drug Design Applications. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600402] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Xiaosa Wu
- Institute for Molecular BioscienceThe University of Queensland306 Carmody Road (Building 80)4072BrisbaneAustralia
| | - Yen‐Hua Huang
- Institute for Molecular BioscienceThe University of Queensland306 Carmody Road (Building 80)4072BrisbaneAustralia
| | - Quentin Kaas
- Institute for Molecular BioscienceThe University of Queensland306 Carmody Road (Building 80)4072BrisbaneAustralia
| | - David J. Craik
- Institute for Molecular BioscienceThe University of Queensland306 Carmody Road (Building 80)4072BrisbaneAustralia
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28
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Fehér K, Timári I, Rákosi K, Szolomájer J, Illyés TZ, Bartok A, Varga Z, Panyi G, Tóth GK, Kövér KE. Probing pattern and dynamics of disulfide bridges using synthesis and NMR of an ion channel blocker peptide toxin with multiple diselenide bonds. Chem Sci 2016; 7:2666-2673. [PMID: 28660039 PMCID: PMC5477041 DOI: 10.1039/c5sc03995a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 12/17/2015] [Indexed: 12/28/2022] Open
Abstract
Anuroctoxin (AnTx), a 35-amino-acid scorpion toxin containing four disulfide bridges, is a high affinity blocker of the voltage-gated potassium channel Kv1.3, but also blocks Kv1.2. To improve potential therapeutic use of the toxin, we have designed a double substituted analog, [N17A/F32T]-AnTx, which showed comparable Kv1.3 affinity to the wild-type peptide, but also a 2500-fold increase in the selectivity for Kv1.3 over Kv1.2. In the present study we have achieved the chemical synthesis of a Sec-analog in which all cysteine (Cys) residues have been replaced by selenocysteine (Sec) forming four diselenide bonds. To the best of our knowledge this is the first time to replace, by chemical synthesis, all disulfide bonds with isosteric diselenides in a peptide/protein. Gratifyingly, the key pharmacological properties of the Sec-[N17A/F32T]-AnTx are retained since the peptide is functionally active. We also propose here a combined experimental and theoretical approach including NOE- and 77Se-based NMR supplemented by MD simulations for conformational and dynamic characterization of the Sec-[N17A/F32T]-AnTx. Using this combined approach allowed us to attain unequivocal assignment of all four diselenide bonds and supplemental MD simulations allowed characterization of the conformational dynamics around each disulfide/diselenide bridge.
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Affiliation(s)
- Krisztina Fehér
- Department of Inorganic and Analytical Chemistry , University of Debrecen , Egyetem tér 1 , H-4032 , Debrecen , Hungary .
- Department of Organic and Macromolecular Chemistry , Ghent University , Kringslaan 281 S4 , 9000 , Ghent , Belgium
| | - István Timári
- Department of Inorganic and Analytical Chemistry , University of Debrecen , Egyetem tér 1 , H-4032 , Debrecen , Hungary .
| | - Kinga Rákosi
- Department of Medical Chemistry , University of Szeged , Dóm tér 8 , H-6720 , Szeged , Hungary .
| | - János Szolomájer
- Department of Medical Chemistry , University of Szeged , Dóm tér 8 , H-6720 , Szeged , Hungary .
| | - Tünde Z Illyés
- Department of Organic Chemistry , University of Debrecen , Egyetem tér 1 , H-4032 , Debrecen , Hungary
| | - Adam Bartok
- Department of Biophysics and Cell Biology , University of Debrecen , Egyetem tér 1 , H-4012 , Debrecen , Hungary
| | - Zoltan Varga
- Department of Biophysics and Cell Biology , University of Debrecen , Egyetem tér 1 , H-4012 , Debrecen , Hungary
- MTA-DE-NAP B Ion Channel Structure-Function Research Group , Egyetem tér 1 , H-4032 , Debrecen , Hungary
| | - Gyorgy Panyi
- Department of Biophysics and Cell Biology , University of Debrecen , Egyetem tér 1 , H-4012 , Debrecen , Hungary
- MTA-DE Cell Biology and Signaling Research Group , University of Debrecen , Egyetem tér 1 , H-4032 , Debrecen , Hungary
| | - Gábor K Tóth
- Department of Medical Chemistry , University of Szeged , Dóm tér 8 , H-6720 , Szeged , Hungary .
| | - Katalin E Kövér
- Department of Inorganic and Analytical Chemistry , University of Debrecen , Egyetem tér 1 , H-4032 , Debrecen , Hungary .
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29
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Medini K, Harris PWR, Menorca A, Hards K, Cook GM, Brimble MA. Synthesis and activity of a diselenide bond mimetic of the antimicrobial protein caenopore-5. Chem Sci 2016; 7:2005-2010. [PMID: 29899924 PMCID: PMC5968448 DOI: 10.1039/c5sc04187b] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Accepted: 12/06/2015] [Indexed: 12/13/2022] Open
Abstract
Antimicrobial proteins are a rich source of new lead compounds for the development of new drugs that will tackle global resistance towards existing antibiotics. Caenopore-5 (Cp-5) is an antimicrobial protein (AMP) expressed in the intestine of the nematode Caenorhabditis elegans and is a member of the lipid binding saposin-like-protein family, composed of 5 α-helices and 3 disulfide bonds. Substitution of the 7Cys and 81Cys by two selenocysteine 7U and 81U afforded a selenocysteine analogue [7Sec-81Sec]-Cp-5, which displayed a higher stability (using thermal circular dichroism) compared to the native protein Cp-5. [7Sec-81Sec]-Cp-5 and an N-terminal truncated peptide exhibited cell permeability similar to the wild type Cp-5.
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Affiliation(s)
- Karima Medini
- Maurice Wilkins Centre for Molecular Biodiscovery , School of Biological Sciences , The University of Auckland , 3A Symonds St , Auckland 1010 , New Zealand . ; ; Tel: +64 9 3737599
| | - Paul W R Harris
- Maurice Wilkins Centre for Molecular Biodiscovery , School of Biological Sciences , The University of Auckland , 3A Symonds St , Auckland 1010 , New Zealand . ; ; Tel: +64 9 3737599
- School of Chemical Sciences , The University of Auckland , 23 Symonds St. , Auckland 1010 , New Zealand
| | - Ayana Menorca
- Department of Microbiology and Immunology , School of Medical Sciences , University of Otago , 720 Cumberland Street , Dunedin 9054 , New Zealand
| | - Kiel Hards
- Department of Microbiology and Immunology , School of Medical Sciences , University of Otago , 720 Cumberland Street , Dunedin 9054 , New Zealand
| | - Gregory M Cook
- Department of Microbiology and Immunology , School of Medical Sciences , University of Otago , 720 Cumberland Street , Dunedin 9054 , New Zealand
| | - Margaret A Brimble
- Maurice Wilkins Centre for Molecular Biodiscovery , School of Biological Sciences , The University of Auckland , 3A Symonds St , Auckland 1010 , New Zealand . ; ; Tel: +64 9 3737599
- School of Chemical Sciences , The University of Auckland , 23 Symonds St. , Auckland 1010 , New Zealand
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30
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Akcan M, Clark RJ, Daly NL, Conibear AC, de Faoite A, Heghinian MD, Sahil T, Adams DJ, Marí F, Craik DJ. Transforming conotoxins into cyclotides: Backbone cyclization of P-superfamily conotoxins. Biopolymers 2015; 104:682-92. [DOI: 10.1002/bip.22699] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 06/17/2015] [Accepted: 07/04/2015] [Indexed: 01/08/2023]
Affiliation(s)
- Muharrem Akcan
- Institute for Molecular Bioscience; The University of Queensland; Brisbane QLD 4072 Australia
| | - Richard J. Clark
- Institute for Molecular Bioscience; The University of Queensland; Brisbane QLD 4072 Australia
| | - Norelle L. Daly
- Institute for Molecular Bioscience; The University of Queensland; Brisbane QLD 4072 Australia
| | - Anne C. Conibear
- Institute for Molecular Bioscience; The University of Queensland; Brisbane QLD 4072 Australia
| | - Andrew de Faoite
- Health Innovations Research Institute; RMIT University; Bundoora VIC 3083 Australia
| | - Mari D. Heghinian
- Department of Chemistry and Biochemistry; Florida Atlantic University; FL 33431 USA
| | - Talwar Sahil
- Queensland Brain Institute; The University of Queensland; Brisbane QLD 4072 Australia
| | - David J. Adams
- Health Innovations Research Institute; RMIT University; Bundoora VIC 3083 Australia
| | - Frank Marí
- Department of Chemistry and Biochemistry; Florida Atlantic University; FL 33431 USA
| | - David J. Craik
- Institute for Molecular Bioscience; The University of Queensland; Brisbane QLD 4072 Australia
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31
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Guo Y, Sun DM, Wang FL, He Y, Liu L, Tian CL. Diaminodiacid Bridges to Improve Folding and Tune the Bioactivity of Disulfide-Rich Peptides. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201500699] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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32
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Guo Y, Sun D, Wang F, He Y, Liu L, Tian C. Diaminodiacid Bridges to Improve Folding and Tune the Bioactivity of Disulfide‐Rich Peptides. Angew Chem Int Ed Engl 2015; 54:14276-81. [DOI: 10.1002/anie.201500699] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2015] [Revised: 04/07/2015] [Indexed: 12/11/2022]
Affiliation(s)
- Ye Guo
- Tsinghua‐Peking Center for Life Sciences, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084 (China)
| | - De‐Meng Sun
- Tsinghua‐Peking Center for Life Sciences, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084 (China)
| | - Feng‐Liang Wang
- Department of Chemistry, University of Science and Technology of China, Hefei 230026 (China)
| | - Yao He
- Hefei National Laboratory for Physical Sciences at the Microscale and School of Life Sciences, University of Science and Technology of China and High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230027 (China)
| | - Lei Liu
- Tsinghua‐Peking Center for Life Sciences, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084 (China)
| | - Chang‐Lin Tian
- Hefei National Laboratory for Physical Sciences at the Microscale and School of Life Sciences, University of Science and Technology of China and High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230027 (China)
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33
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Aoki K, Maeda M, Nakae T, Okada Y, Ohya K, Chiba K. A disulfide bond replacement strategy enables the efficient design of artificial therapeutic peptides. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.05.079] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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34
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Metanis N, Hilvert D. Harnessing selenocysteine reactivity for oxidative protein folding. Chem Sci 2014; 6:322-325. [PMID: 28757941 PMCID: PMC5514408 DOI: 10.1039/c4sc02379j] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Accepted: 09/22/2014] [Indexed: 01/06/2023] Open
Abstract
Turbo-charged folding with selenium: targeted replacement of cysteines in proteins with selenocysteines is a valuable strategy for increasing the rates of oxidative protein folding, altering folding mechanisms, and rescuing kinetically trapped intermediates.
Although oxidative folding of disulfide-rich proteins is often sluggish, this process can be significantly enhanced by targeted replacement of cysteines with selenocysteines. In this study, we examined the effects of a selenosulfide and native versus nonnative diselenides on the folding rates and mechanism of bovine pancreatic trypsin inhibitor. Our results show that such sulfur-to-selenium substitutions alter the distribution of key folding intermediates and enhance their rates of interconversion in a context-dependent manner.
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Affiliation(s)
- Norman Metanis
- Laboratory of Organic Chemistry , ETH Zürich , 8093 Zürich , Switzerland .
| | - Donald Hilvert
- Laboratory of Organic Chemistry , ETH Zürich , 8093 Zürich , Switzerland .
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35
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Takei T, Urabe Y, Asahina Y, Hojo H, Nomura T, Dedachi K, Arai K, Iwaoka M. Model Study Using Designed Selenopeptides on the Importance of the Catalytic Triad for the Antioxidative Functions of Glutathione Peroxidase. J Phys Chem B 2013; 118:492-500. [DOI: 10.1021/jp4113975] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Toshiki Takei
- Department
of Chemistry, School of Science, Tokai University, Kitakaname, Hiratsuka-shi, Kanagawa 259-1292, Japan
| | - Yoshiko Urabe
- Department
of Chemistry, School of Science, Tokai University, Kitakaname, Hiratsuka-shi, Kanagawa 259-1292, Japan
| | - Yuya Asahina
- Department
of Applied Biochemistry, Tokai University, Kitakaname, Hiratsuka-shi, Kanagawa 259-1292, Japan
| | - Hironobu Hojo
- Department
of Applied Biochemistry, Tokai University, Kitakaname, Hiratsuka-shi, Kanagawa 259-1292, Japan
| | - Takeshi Nomura
- Department
of Chemistry, School of Science, Tokai University, Kitakaname, Hiratsuka-shi, Kanagawa 259-1292, Japan
| | - Kenichi Dedachi
- Department
of Chemistry, School of Science, Tokai University, Kitakaname, Hiratsuka-shi, Kanagawa 259-1292, Japan
| | - Kenta Arai
- Department
of Chemistry, School of Science, Tokai University, Kitakaname, Hiratsuka-shi, Kanagawa 259-1292, Japan
| | - Michio Iwaoka
- Department
of Chemistry, School of Science, Tokai University, Kitakaname, Hiratsuka-shi, Kanagawa 259-1292, Japan
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36
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Malins LR, Mitchell NJ, Payne RJ. Peptide ligation chemistry at selenol amino acids. J Pept Sci 2013; 20:64-77. [DOI: 10.1002/psc.2581] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Revised: 10/09/2013] [Accepted: 10/10/2013] [Indexed: 01/18/2023]
Affiliation(s)
- Lara R. Malins
- School of Chemistry; The University of Sydney; Sydney NSW 2006 Australia
| | | | - Richard J. Payne
- School of Chemistry; The University of Sydney; Sydney NSW 2006 Australia
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37
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Incorporation of post-translational modified amino acids as an approach to increase both chemical and biological diversity of conotoxins and conopeptides. Amino Acids 2013; 46:125-51. [DOI: 10.1007/s00726-013-1606-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2013] [Accepted: 10/17/2013] [Indexed: 02/06/2023]
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38
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Cui HK, Guo Y, He Y, Wang FL, Chang HN, Wang YJ, Wu FM, Tian CL, Liu L. Diaminodiacid-Based Solid-Phase Synthesis of Peptide Disulfide Bond Mimics. Angew Chem Int Ed Engl 2013; 52:9558-62. [DOI: 10.1002/anie.201302197] [Citation(s) in RCA: 105] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Revised: 04/28/2013] [Indexed: 01/11/2023]
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39
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Cui HK, Guo Y, He Y, Wang FL, Chang HN, Wang YJ, Wu FM, Tian CL, Liu L. Diaminodiacid-Based Solid-Phase Synthesis of Peptide Disulfide Bond Mimics. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201302197] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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40
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Li C, Wang Y, Zhang X, Deng L, Zhang Y, Chen Z. Tumor-targeted liposomal drug delivery mediated by a diseleno bond-stabilized cyclic peptide. Int J Nanomedicine 2013; 8:1051-62. [PMID: 23515368 PMCID: PMC3598503 DOI: 10.2147/ijn.s40498] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Peptide ligands have played an important role in tumor-targeted drug delivery as targeting moieties. The in vivo fate of peptide-mediated drug delivery systems and the following antitumor effects may greatly depend on the stability of the peptide ligand. In the current study, a tumor-targeting cyclic peptide screened by phage display, Lyp-1 (a peptide that specifically binds to tumor and endothelial cells of tumor lymphatics in certain tumors), was structurally modified by replacement of the original intramolecular disulfide bond with a diseleno bond. The produced analog Syp-1 (seleno derivative of Lyp-1) maintained specific binding ability to the target protein p32 (Kd = 18.54 nM), which is similar to that of Lyp-1 (Kd = 10.59 nM), indicated by surface plasmon resonance assay. Compared with Lyp-1, Syp-1 showed significantly improved stability against serum. After the peptide attached onto the surface of fluorophore-encapsulating liposomes, the more efficient tumor uptake of liposomal fluorophore mediated by Syp-1 was observed. Furthermore, Syp-1 modified liposomal doxorubicin presented the most potent tumor growth inhibitory ability among all the therapeutic groups, with a low half maximal inhibitory concentration of 588 nM against MDA-MB-435 cells in vitro and a high tumor inhibition rate of 73.5% in vivo. These findings clearly indicated that Syp-1 was a stable and effective tumor targeting ligand and suggest that the sulfur-to-selenium replacement strategy may help stabilize the phage-displayed cyclic peptide containing disulfide-bond under physiological conditions and strongly support the validity of peptide-mediated drug targeting.
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Affiliation(s)
- Chong Li
- Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, People's Republic of China.
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41
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Heverly-Coulson GS, Boyd RJ, Mó O, Yáñez M. Revealing Unexpected Mechanisms for Nucleophilic Attack on SS and SeSe Bridges. Chemistry 2013; 19:3629-38. [DOI: 10.1002/chem.201203328] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Revised: 11/28/2012] [Indexed: 01/01/2023]
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42
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Dernovics M, Vass A, Németh A, Magyar A. Synthesis and application of a Sec2-containing oligopeptide for method evaluation purposes in selenium speciation. Talanta 2012; 99:186-93. [DOI: 10.1016/j.talanta.2012.05.038] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Revised: 05/17/2012] [Accepted: 05/19/2012] [Indexed: 11/17/2022]
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43
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Gowd KH, Blais KD, Elmslie KS, Steiner AM, Olivera BM, Bulaj G. Dissecting a role of evolutionary-conserved but noncritical disulfide bridges in cysteine-rich peptides using ω-conotoxin GVIA and its selenocysteine analogs. Biopolymers 2012; 98:212-23. [PMID: 22782563 DOI: 10.1002/bip.22047] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Conotoxins comprise a large group of peptidic neurotoxins that use diverse disulfide-rich scaffolds. Each scaffold is determined by an evolutionarily conserved pattern of cysteine residues. Although many structure-activity relationship studies confirm the functional and structural importance of disulfide crosslinks, there is growing evidence that not all disulfide bridges are critical in maintaining activities of conotoxins. To answer the fundamental biological question of what the role of noncritical disulfide bridges is, we investigated function and folding of disulfide-depleted analogs of ω-conotoxin GVIA (GVIA) that belongs to an inhibitory cystine knot motif family and blocks N-type calcium channels. Removal of a noncritical Cys1-Cys16 disulfide bridge in GVIA or its selenopeptide analog had, as predicted, rather minimal effects on the inhibitory activity on calcium channels, as well as on in vivo activity following intracranial administration. However, the disulfide-depleted GVIA exhibited significantly lower folding yields for forming the remaining two native disulfide bridges. The disulfide-depleted selenoconotoxin GVIA analog also folded with significantly lower yields, suggesting that the functionally noncritical disulfide pair plays an important cooperative role in forming the native disulfide scaffold. Taken together, our results suggest that distinct disulfide bridges may be evolutionarily preserved by the oxidative folding or/and stabilization of the bioactive conformation of a disulfide-rich scaffold.
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44
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Metanis N, Hilvert D. Strategic Use of Non-Native Diselenide Bridges to Steer Oxidative Protein Folding. Angew Chem Int Ed Engl 2012; 51:5585-8. [DOI: 10.1002/anie.201109129] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Indexed: 11/07/2022]
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45
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Metanis N, Hilvert D. Strategic Use of Non-Native Diselenide Bridges to Steer Oxidative Protein Folding. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201109129] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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46
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Boutureira O, Bernardes GJL, Fernández-González M, Anthony DC, Davis BG. Selenenylsulfide-Linked Homogeneous Glycopeptides and Glycoproteins: Synthesis of Human “Hepatic Se Metabolite A”. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201106658] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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47
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Boutureira O, Bernardes GJL, Fernández-González M, Anthony DC, Davis BG. Selenenylsulfide-Linked Homogeneous Glycopeptides and Glycoproteins: Synthesis of Human “Hepatic Se Metabolite A”. Angew Chem Int Ed Engl 2011; 51:1432-6. [DOI: 10.1002/anie.201106658] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Indexed: 12/22/2022]
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48
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Dekan Z, Vetter I, Daly NL, Craik DJ, Lewis RJ, Alewood PF. α-Conotoxin ImI Incorporating Stable Cystathionine Bridges Maintains Full Potency and Identical Three-Dimensional Structure. J Am Chem Soc 2011; 133:15866-9. [DOI: 10.1021/ja206408q] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Zoltan Dekan
- Institute for Molecular Bioscience, The University of Queensland, St Lucia 4072, Queensland, Australia
| | - Irina Vetter
- Institute for Molecular Bioscience, The University of Queensland, St Lucia 4072, Queensland, Australia
| | - Norelle L. Daly
- Institute for Molecular Bioscience, The University of Queensland, St Lucia 4072, Queensland, Australia
| | - David J. Craik
- Institute for Molecular Bioscience, The University of Queensland, St Lucia 4072, Queensland, Australia
| | - Richard J. Lewis
- Institute for Molecular Bioscience, The University of Queensland, St Lucia 4072, Queensland, Australia
| | - Paul F. Alewood
- Institute for Molecular Bioscience, The University of Queensland, St Lucia 4072, Queensland, Australia
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49
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de Araujo AD, Callaghan B, Nevin ST, Daly NL, Craik DJ, Moretta M, Hopping G, Christie MJ, Adams DJ, Alewood PF. Total Synthesis of the Analgesic Conotoxin MrVIB through Selenocysteine-Assisted Folding. Angew Chem Int Ed Engl 2011; 50:6527-9. [DOI: 10.1002/anie.201101642] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2011] [Indexed: 12/30/2022]
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50
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de Araujo AD, Callaghan B, Nevin ST, Daly NL, Craik DJ, Moretta M, Hopping G, Christie MJ, Adams DJ, Alewood PF. Total Synthesis of the Analgesic Conotoxin MrVIB through Selenocysteine-Assisted Folding. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201101642] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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