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Mini-αA-Crystallin Stifled Melittin-Induced Haemolysis and Lymphocyte Lysis. Int J Pept Res Ther 2023. [DOI: 10.1007/s10989-023-10502-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
Abstract
AbstractMelittin, the most potent pharmacological ingredient of honey bee venom, induces haemolysis, lymphocyte lysis, long-term pain, localised inflammation, and hyperalgesia. In this study, efforts were made to subdue the melittin’s ill effects using a chaperone peptide called ‘mini-αA-crystallin’ (MAC) derived from eye lens αA-crystallin. Haemolytic test on human red blood cells, percentage viability, and DNA diffusion assay on Human peripheral blood lymphocytes (HPBLs) were performed with melittin in the presence or absence of MAC. Propidium iodide and Annexin V-FITC dual staining were performed to analyse quantitative levels of necrotic and apoptotic induction by melittin in the presence or absence of MAC on HPBLs using a flow cytometer. A computational study to find out the interactions between MAC and melittin was undertaken by modelling the structure of MAC using a PEP-FOLD server. The result showed that MAC inhibited melittin-induced lysis in nucleated (lymphocytes) and enucleated (RBC) cells. Flow cytometric analysis revealed a substantial increase in the necrotic and late apoptotic cells after treating HPBLs with melittin (4 µg/ml) for 24 h. Treatment with MAC at a 2:1 molar ratio prevented HPBLs from developing melittin-induced necrosis and late apoptosis. In the docking study, hydrogen, van der Waals, π-π stacking, and salt bridges were observed between the MAC and melittin complex, confirming a strong interaction between them. The MAC-melittin complex was stable during molecular dynamics simulation. These findings may be beneficial in developing a medication for treating severe cases of honeybee stings.
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2
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Kanemitsu S, Morita K, Tominaga Y, Nishimura K, Yashiro T, Sakurai H, Yamamoto Y, Kurisaki I, Tanaka S, Matsui M, Ooya T, Tamura A, Maruyama T. Inhibition of Melittin Activity Using a Small Molecule with an Indole Ring. J Phys Chem B 2022; 126:5793-5802. [PMID: 35913127 DOI: 10.1021/acs.jpcb.2c03595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We investigated d-amino acids as potential inhibitors targeting l-peptide toxins. Among the l- and d-amino acids tested, we found that d-tryptophan (d-Trp) acted as an inhibitor of melittin-induced hemolysis. We then evaluated various Trp derivatives and found that 5-chlorotryptamine (5CT) had the largest inhibitory effect on melittin. The indole ring, amino group, and steric hindrance of an inhibitor played important roles in the inhibition of melittin activity. Despite the small size and simple molecular structure of 5CT, its IC50 was approximately 13 μg/mL. Fluorescence quenching, circular dichroism measurements, and size-exclusion chromatography revealed that 5CT interacted with Trp19 in melittin and affected the formation of the melittin tetramer involved in hemolysis. Molecular dynamics simulation of melittin also indicated that the interaction of 5CT with Trp19 in melittin affected the formation of the tetramer.
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Affiliation(s)
- Sayuki Kanemitsu
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan
| | - Kenta Morita
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan
| | - Yudai Tominaga
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan
| | - Kanon Nishimura
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan
| | - Tomoko Yashiro
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan
| | - Haruka Sakurai
- Graduate School of Science, Department of Chemistry, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan
| | - Yumemi Yamamoto
- Graduate School of Science, Department of Chemistry, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan
| | - Ikuo Kurisaki
- Department of Computational Science, Graduate School of System Informatics, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan
| | - Shigenori Tanaka
- Department of Computational Science, Graduate School of System Informatics, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan
| | - Masaki Matsui
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan
| | - Tooru Ooya
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan
| | - Atsuo Tamura
- Graduate School of Science, Department of Chemistry, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan
| | - Tatsuo Maruyama
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan.,Research Center for Membrane and Film Technology, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan
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3
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Hoshino Y, Taniguchi S, Takimoto H, Akashi S, Katakami S, Yonamine Y, Miura Y. Homogeneous Oligomeric Ligands Prepared via Radical Polymerization that Recognize and Neutralize a Target Peptide. Angew Chem Int Ed Engl 2019; 59:679-683. [DOI: 10.1002/anie.201910558] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2019] [Indexed: 12/27/2022]
Affiliation(s)
- Yu Hoshino
- Department of Chemical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan
| | - Shohei Taniguchi
- Department of Chemical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan
| | - Hinata Takimoto
- Department of Chemical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan
| | - Sotaro Akashi
- Department of Chemical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan
| | - Sho Katakami
- Department of Chemical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan
| | - Yusuke Yonamine
- Department of Chemical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan
| | - Yoshiko Miura
- Department of Chemical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan
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4
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Hoshino Y, Taniguchi S, Takimoto H, Akashi S, Katakami S, Yonamine Y, Miura Y. Homogeneous Oligomeric Ligands Prepared via Radical Polymerization that Recognize and Neutralize a Target Peptide. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201910558] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Yu Hoshino
- Department of Chemical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan
| | - Shohei Taniguchi
- Department of Chemical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan
| | - Hinata Takimoto
- Department of Chemical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan
| | - Sotaro Akashi
- Department of Chemical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan
| | - Sho Katakami
- Department of Chemical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan
| | - Yusuke Yonamine
- Department of Chemical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan
| | - Yoshiko Miura
- Department of Chemical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan
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5
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Carney RP, Thillier Y, Kiss Z, Sahabi A, Heleno Campos JC, Knudson A, Liu R, Olivos D, Saunders M, Tian L, Lam KS. Combinatorial Library Screening with Liposomes for Discovery of Membrane Active Peptides. ACS COMBINATORIAL SCIENCE 2017; 19:299-307. [PMID: 28378995 DOI: 10.1021/acscombsci.6b00182] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Membrane active peptides (MAPs) represent a class of short biomolecules that have shown great promise in facilitating intracellular delivery without disrupting cellular plasma membranes. Yet their clinical application has been stalled by numerous factors: off-target delivery, a requirement for high local concentration near cells of interest, degradation en route to the target site, and in the case of cell-penetrating peptides, eventual entrapment in endolysosomal compartments. The current method of deriving MAPs from naturally occurring proteins has restricted the discovery of new peptides that may overcome these limitations. Here, we describe a new branch of assays featuring high-throughput functional screening capable of discovering new peptides with tailored cell uptake and endosomal escape capabilities. The one-bead-one-compound (OBOC) combinatorial method is used to screen libraries containing millions of potential MAPs for binding to synthetic liposomes, which can be adapted to mimic various aspects of limiting membranes. By incorporating unnatural and d-amino acids in the library, in addition to varying buffer conditions and liposome compositions, we have identified several new highly potent MAPs that improve on current standards and introduce motifs that were previously unknown or considered unsuitable. Since small variations in pH and lipid composition can be controlled during screening, peptides discovered using this methodology could aid researchers building drug delivery platforms with unique requirements, such as targeted intracellular localization.
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Affiliation(s)
- Randy P. Carney
- Department
of Biochemistry and Molecular Medicine, University of California Davis, 2700 Stockton Boulevard, Sacramento, California 95817, United States
| | - Yann Thillier
- Department
of Biochemistry and Molecular Medicine, University of California Davis, 2700 Stockton Boulevard, Sacramento, California 95817, United States
| | - Zsofia Kiss
- Department
of Biochemistry and Molecular Medicine, University of California Davis, 2700 Stockton Boulevard, Sacramento, California 95817, United States
| | - Amir Sahabi
- Department
of Biochemistry and Molecular Medicine, University of California Davis, 2700 Stockton Boulevard, Sacramento, California 95817, United States
| | - Jean Carlos Heleno Campos
- Department
of Biochemistry and Molecular Medicine, University of California Davis, 2700 Stockton Boulevard, Sacramento, California 95817, United States
| | - Alisha Knudson
- Department
of Biochemistry and Molecular Medicine, University of California Davis, 2700 Stockton Boulevard, Sacramento, California 95817, United States
| | - Ruiwu Liu
- Department
of Biochemistry and Molecular Medicine, University of California Davis, 2700 Stockton Boulevard, Sacramento, California 95817, United States
| | - David Olivos
- Department
of Biochemistry and Molecular Medicine, University of California Davis, 2700 Stockton Boulevard, Sacramento, California 95817, United States
| | - Mary Saunders
- Department
of Biochemistry and Molecular Medicine, University of California Davis, 2700 Stockton Boulevard, Sacramento, California 95817, United States
| | - Lin Tian
- Department
of Biochemistry and Molecular Medicine, University of California Davis, 2700 Stockton Boulevard, Sacramento, California 95817, United States
| | - Kit S. Lam
- Department
of Biochemistry and Molecular Medicine, University of California Davis, 2700 Stockton Boulevard, Sacramento, California 95817, United States
- Division
of Hematology/Oncology, University of California Davis Cancer Center, Sacramento, California United States
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6
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Aita T, Nishigaki K, Husimi Y. Theoretical consideration of selective enrichment in in vitro selection: optimal concentration of target molecules. Math Biosci 2012; 240:201-11. [PMID: 22884878 DOI: 10.1016/j.mbs.2012.07.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2012] [Revised: 07/20/2012] [Accepted: 07/21/2012] [Indexed: 11/25/2022]
Abstract
We considered an in vitro selection system composed of a peptide-ligand library and a single target protein receptor, and examined effective strategies to realize maximum efficiency in selection. In the system, a ligand molecule with sequence s binds to a target receptor with probability of [R]/(K(ds)+[R]) (specific binding) or binds to non-target materials with probability of q (non-specific binding), where [R] and K(ds) represent the free target-receptor concentration at equilibrium and dissociation constant K(d) of the ligand sequence s with the receptor, respectively. Focusing on the fittest sequence with the highest affinity (represented by K(d1) ≡ min{K(ds)|s=1,2,…,M}) in the ligand library with a library size N and diversity M, we examined how the target concentration [R] should be set in each round to realize the maximum enrichment of the fittest sequence. In conclusion, when N >> M (that realizes a deterministic process), it is desirable to adopt [R]=K(d1), and when N=M (that realizes a stochastic process), [R]=[Formula in text] only in the first round (where * represents the population average) and [R]=K(d1) in the subsequent rounds. Based on this strategy, the mole fraction of the fittest increases by (2q)(-r) times after the rth round. With realistic parameters, we calculated several quantities such as the optimal [R] values and number of rounds needed. These values were quite reasonable and consistent with observations, suggesting the validity of our theory.
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Affiliation(s)
- Takuyo Aita
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Saitama 338-8570, Japan.
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7
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In vivo discovery of a peptide that prevents CUG-RNA hairpin formation and reverses RNA toxicity in myotonic dystrophy models. Proc Natl Acad Sci U S A 2011; 108:11866-71. [PMID: 21730182 DOI: 10.1073/pnas.1018213108] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Myotonic dystrophy type 1 (DM1) is caused by the expansion of noncoding CTG repeats in the dystrophia myotonica-protein kinase gene. Mutant transcripts form CUG hairpins that sequester RNA-binding factors into nuclear foci, including Muscleblind-like-1 protein (MBNL1), which regulate alternative splicing and gene expression. To identify molecules that target toxic CUG transcripts in vivo, we performed a positional scanning combinatorial peptide library screen using a Drosophila model of DM1. The screen identified a D-amino acid hexapeptide (ABP1) that reduced CUG foci formation and suppressed CUG-induced lethality and muscle degeneration when administered orally. Transgenic expression of natural, L-amino acid ABP1 analogues reduced CUG-induced toxicity in fly eyes and muscles. Furthermore, ABP1 reversed muscle histopathology and splicing misregulation of MBNL1 targets in DM1 model mice. In vitro, ABP1 bound to CUG hairpins and induced a switch to a single-stranded conformation. Our findings demonstrate that ABP1 shows antimyotonic dystrophy activity by targeting the core of CUG toxicity.
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8
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9
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Hoshino Y, Urakami T, Kodama T, Koide H, Oku N, Okahata Y, Shea KJ. Design of synthetic polymer nanoparticles that capture and neutralize a toxic peptide. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2009; 5:1562-1568. [PMID: 19296557 PMCID: PMC2804256 DOI: 10.1002/smll.200900186] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Designed polymer nanoparticles (NPs) capable of binding and neutralizing a biomacromolecular toxin are prepared. A library of copolymer NPs is synthesized from combinations of functional monomers. The binding capacity and affinity of the NPs are individually analyzed. NPs with optimized composition are capable of neutralizing the toxin even in a complex biological milieu. It is anticipated that this strategy will be a starting point for the design of synthetic alternatives to antibodies.
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Affiliation(s)
- Yu Hoshino
- Department of Chemistry, University of California, Irvine, Irvine, CA 92697 (USA),
| | - Takeo Urakami
- Department of Medical Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526 (Japan)
| | - Takashi Kodama
- Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259 Nagatsuda, Midoriku, Yokohama 226-8501 (Japan)
| | - Hiroyuki Koide
- Department of Medical Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526 (Japan)
| | - Naoto Oku
- Department of Medical Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526 (Japan)
| | - Yoshio Okahata
- Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259 Nagatsuda, Midoriku, Yokohama 226-8501 (Japan)
| | - Kenneth J. Shea
- Department of Chemistry, University of California, Irvine, Irvine, CA 92697 (USA),
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10
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Hoshino Y, Kodama T, Okahata Y, Shea KJ. Peptide imprinted polymer nanoparticles: a plastic antibody. J Am Chem Soc 2008; 130:15242-3. [PMID: 18942788 DOI: 10.1021/ja8062875] [Citation(s) in RCA: 315] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel method for preparation of biomacromolecular imprinted nanoparticles is described. Combinations of functional monomers were polymerized in the presence of the imprinting peptide melittin in aqueous solution at room temperature to produce a small library of polymer nanoparticles. The template peptide and unreacted monomers are subsequently removed by dialysis. Nanoparticles (NPs) from the library were evaluated for their binding to melittin by 27 MHz QCM analysis. NPs prepared with optimized functional monomer combinations bind strongly to the target molecule. Nanoparticles that were polymerized in the absence of template peptide were found to have little affinity to the peptide. Binding affinity and the size of imprinted particles are comparable to those of natural antibodies. They interact specifically with the target peptide and show little affinity for other proteins. These NPs are of interest as inert and stable substitutes for antibodies. Extension of this approach to other targets of biological importance and the applications of these materials are currently being evaluated.
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Affiliation(s)
- Yu Hoshino
- Department of Chemistry, University of California, Irvine, California 92697, USA
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11
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Mas-Moruno C, Cruz LJ, Mora P, Francesch A, Messeguer A, Pérez-Paya E, Albericio F. Smallest peptoids with antiproliferative activity on human neoplastic cells. J Med Chem 2007; 50:2443-9. [PMID: 17432841 DOI: 10.1021/jm061166z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Libraries of new, small peptoid monomers and dipeptoids were synthesized and assayed for antiproliferative activity against representative human neoplastic cell lines. The C-terminal N-alkyl amide peptoids are cytotoxic and are the smallest peptoids reported to have such activity. These compounds were conveniently synthesized on a BAL resin. Owing to their structure, the peptoids did not suffer from DKP formation, a problematic side reaction typically observed in peptide and peptoid synthesis.
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Affiliation(s)
- Carlos Mas-Moruno
- Institute for Research in Biomedicine, Barcelona Science Park, University of Barcelona, Barcelona, Spain
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12
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Masip I, Cortés N, Abad MJ, Guardiola M, Pérez-Payá E, Ferragut J, Ferrer-Montiel A, Messeguer A. Design and synthesis of an optimized positional scanning library of peptoids: identification of novel multidrug resistance reversal agents. Bioorg Med Chem 2005; 13:1923-9. [PMID: 15727848 DOI: 10.1016/j.bmc.2005.01.024] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2004] [Revised: 01/10/2005] [Accepted: 01/14/2005] [Indexed: 11/30/2022]
Abstract
Herein is reported the optimized solid-phase synthesis of a library of 5,120 trimeric N-alkylglycines (peptoids) using the positional scanning format and the submonomer strategy. Diversity at the N-terminal position was generated from 20 commercially available primary amines, whereas 16 primary amines were employed for the middle and C-terminal positions of the trimers. Formation of undesirable side-products observed in a previous library synthesis (Humet, M. et al. J. Comb. Chem. 2003, 5, 597-605) was averted by restricting the use of primary amines functionalized with tertiary amino groups to the third amination step. Screening of the new library for the identification of chemosensitizers yielded two peptoids, compounds 1 and 2, with potent in vitro activity as multidrug resistance (MDR) reversal agents. The structures of the lead peptoids are consistent with a pharmacophore model generated from the interaction of various known inhibitors with the MDR-implicated transmembrane glycoprotein P-gp.
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Affiliation(s)
- Isabel Masip
- Department of Biological Organic Chemistry, I.I.Q.A.B. (C.S.I.C.), J. Girona, 18, E-08034 Barcelona, Spain
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13
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Humet M, Carbonell T, Masip I, Sánchez-Baeza F, Mora P, Cantón E, Gobernado M, Abad C, Pérez-Payá E, Messeguer A. A positional scanning combinatorial library of peptoids as a source of biological active molecules: identification of antimicrobials. JOURNAL OF COMBINATORIAL CHEMISTRY 2003; 5:597-605. [PMID: 12959560 DOI: 10.1021/cc020075u] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A positional scanning library of N-alkylglycine trimers (peptoids) containing over 10 000 compounds has been synthesized on solid phase. The synthetic pathway involved the use of the submonomer strategy and a set of 22 commercially available primary amines as a chemical diversity source. The unbiased nature of the library allowed its screening against a variety of biological targets, leading to the identification of individual peptoids exhibiting remarkable biological activities (García-Martínez, C. et al. Proc. Natl. Acad. Sci. U.S.A. 2002, 99, 2374. Montoliu, et al. J. Pharm. Exp. Therap. 2002, 302, 29. Planells-Cases, R., et al. J. Pharm. Exp. Therap. 2002, 302, 163). In the present work, the screening of this library against a panel of Gram-positive and Gram-negative bacteria led to the identification of different compounds exhibiting antimicrobial activity.
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Affiliation(s)
- Marc Humet
- Department of Biological Organic Chemistry, I.I.Q.A.B. (C.S.I.C.), E-08034 Barcelona, Spain
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14
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Nefzi A, Ostresh JM, Houghten RA. Combinatorial chemistry: mixture-based combinatorial libraries of acyclic and heterocyclic compounds from amino acids and short peptides. EXS 2003:109-23. [PMID: 12613174 DOI: 10.1007/978-3-0348-7997-2_6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Affiliation(s)
- Adel Nefzi
- Torrey Pines Institute for Molecular Studies, 3550 General Atomics Court, San Diego, CA 92121, USA
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15
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Cowell SM, Gu X, Vagner J, Hruby VJ. Intelligent Design in Combinatorial Chemistry: Use of Designed Peptide Libraries to Explore Secondary and Tertiary Structures in Peptides and Proteins. Methods Enzymol 2003; 369:288-97. [PMID: 14722960 DOI: 10.1016/s0076-6879(03)69016-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Affiliation(s)
- Scott M Cowell
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, USA
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16
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López-García B, Pérez-Payá E, Marcos JF. Identification of novel hexapeptides bioactive against phytopathogenic fungi through screening of a synthetic peptide combinatorial library. Appl Environ Microbiol 2002; 68:2453-60. [PMID: 11976121 PMCID: PMC127571 DOI: 10.1128/aem.68.5.2453-2460.2002] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The purpose of the present study was to improve the antifungal activity against selected phytopathogenic fungi of the previously identified hexapeptide PAF19. We describe some properties of a set of novel synthetic hexapeptides whose D-amino acid sequences were obtained through screening of a synthetic peptide combinatorial library in a positional scanning format. As a result of the screening, 12 putative bioactive peptides were identified, synthesized, and assayed. The peptides PAF26 (Ac-rkkwfw-NH(2)), PAF32 (Ac-rkwhfw-NH(2)), and PAF34 (Ac-rkwlfw-NH(2)) showed stronger activity than PAF19 against isolates of Penicillium digitatum, Penicillium italicum, and Botrytis cinerea. PAF26 and PAF32, but not PAF34, were also active against Fusarium oxysporum. Penicillium expansum was less susceptible to all four PAF peptides, and only PAF34 showed weak activity against it. Assays were also conducted on nontarget organisms, and PAF26 and PAF32 showed much-reduced toxicity to Escherichia coli and Saccharomyces cerevisiae, demonstrating selectivity towards certain filamentous fungi. Thus, the data showed distinct activity profiles for peptides differentiated by just one or two residue substitutions. Our conclusion from this observation is that a specificity factor is involved in the activity of these short peptides. Furthermore, PAF26 and PAF32 displayed activities against P. digitatum, P. italicum, and B. cinerea similar to that of the hemolytic 26-amino acid melittin, but they did not show the high toxicity of melittin towards bacteria and yeasts. The four peptides acted additively, with no synergistic interactions among them, and PAF26 was shown to have improved activity over PAF19 in in vivo orange fruit decay experiments.
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Affiliation(s)
- Belén López-García
- Departamento de Ciencia de los Alimentos, Instituto de Agroquímica y Tecnología de Alimentos-CSIC, E-46100 Valencia, Spain
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17
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Reixach N, Crooks E, Ostresh JM, Houghten RA, Blondelle SE. Inhibition of beta-amyloid-induced neurotoxicity by imidazopyridoindoles derived from a synthetic combinatorial library. J Struct Biol 2000; 130:247-58. [PMID: 10940229 DOI: 10.1006/jsbi.2000.4245] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Alzheimer's disease is a progressive neurodegenerative disorder characterized by the deposit of amyloid fibrils in the brain that result from the self-aggregative polymerization of the beta-amyloid peptide (Abeta). Evidence of a direct correlation between the ability of Abeta to form stable aggregates in aqueous solution and its neurotoxicity has been reported. The cytotoxic effects of Abeta have been attributed to the aggregation properties of a domain corresponding to the peptide fragment Abeta25-35. In an effort to generate novel inhibitors of Abeta neurotoxicity and/or aggregation, a mixture-based synthetic combinatorial library composed of 23 375 imidazopyridoindoles was generated and screened for inhibition of Abeta25-35 neurotoxicity toward the rat pheochromocytoma PC-12 cell line. The effect of the identified lead compounds on Abeta25-35 aggregation was then evaluated by means of circular dichroism (CD) and thioflavin-T fluorescence spectroscopy. Their activity against Abeta1-42 neurotoxicity toward the PC-12 cell line was also determined. The most active imidazopyridoindoles inhibited both Abeta25-35 and Abeta1-42 neurotoxicity in the low- to mid-micromolar range. Furthermore, inhibition of the random coil to beta-sheet transition and self-aggregation of Abeta25-35 was observed by CD and fluorescence spectroscopy, supporting the relationship between inhibition of the Abeta aggregation process and neurotoxicity.
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Affiliation(s)
- N Reixach
- Torrey Pines Institute for Molecular Studies, 3550 General Atomics Court, San Diego, California, 92121, USA
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Houghten RA, Pinilla C, Appel JR, Blondelle SE, Dooley CT, Eichler J, Nefzi A, Ostresh JM. Mixture-based synthetic combinatorial libraries. J Med Chem 1999; 42:3743-78. [PMID: 10508425 DOI: 10.1021/jm990174v] [Citation(s) in RCA: 226] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- R A Houghten
- Torrey Pines Institute for Molecular Studies, 3550 General Atomics Court, San Diego, California 92121, USA
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Nefzi A, Dooley C, Ostresh JM, Houghten RA. Combinatorial chemistry: from peptides and peptidomimetics to small organic and heterocyclic compounds. Bioorg Med Chem Lett 1998; 8:2273-8. [PMID: 9873527 DOI: 10.1016/s0960-894x(98)00412-0] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Modified dipeptides have been used successfully for the generation of a variety of small organic and heterocyclic combinatorial libraries, including linear urea, polyamine, hydantoin, thiohydantoin, cyclic urea, cyclic thiourea and bicyclic guanidine. The synthesis and screening results for a number of these libraries are described. The solid phase synthesis of heterocyclic compounds such as diazepine and thiomorpholinone are also described.
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Affiliation(s)
- A Nefzi
- Torrey Pines Institute for Molecular Studies, San Diego, CA 92121, USA
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Nefzi A, Ostresh JM, Houghten RA. The Current Status of Heterocyclic Combinatorial Libraries. Chem Rev 1997; 97:449-472. [PMID: 11848878 DOI: 10.1021/cr960010b] [Citation(s) in RCA: 512] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Adel Nefzi
- Torrey Pines Institute for Molecular Studies, 3550 General Atomics Court, San Diego, California 92121
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Felder ER, Poppinger D. Combinatorial compound libraries for enhanced drug discovery approaches. ADVANCES IN DRUG RESEARCH 1997. [DOI: 10.1016/s0065-2490(97)80006-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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