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Mihara K, Nakajima N, Fujii I, Fujiwara D. Generation of inhibitory peptides for
IKKε
from a kinase‐focused phage library of helix‐loop‐helix peptides. Pept Sci (Hoboken) 2021. [DOI: 10.1002/pep2.24253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Kousuke Mihara
- Department of Biological Science, Graduate School of Science Osaka Prefecture University Osaka Japan
| | - Natsumi Nakajima
- Department of Biological Science, Graduate School of Science Osaka Prefecture University Osaka Japan
| | - Ikuo Fujii
- Department of Biological Science, Graduate School of Science Osaka Prefecture University Osaka Japan
| | - Daisuke Fujiwara
- Department of Biological Science, Graduate School of Science Osaka Prefecture University Osaka Japan
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Ramanayake Mudiyanselage TM, Michigami M, Ye Z, Uyeda A, Inoue N, Sugiura K, Fujii I, Fujiwara D. An Immune-Stimulatory Helix-Loop-Helix Peptide: Selective Inhibition of CTLA-4-B7 Interaction. ACS Chem Biol 2020; 15:360-368. [PMID: 31841301 DOI: 10.1021/acschembio.9b00743] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Molecular-targeting peptides and mini-proteins are promising alternatives to antibodies in a wide range of applications in bioscience and medicine. We have developed a helix-loop-helix (HLH) peptide as an alternative to antibodies to inhibit specific protein interactions. Cytotoxic T lymphocyte antigen-4 (CTLA-4) downregulates immune responses of cytotoxic T-cells by interaction with B7-1, a co-stimulatory molecule expressed on antigen presenting cells (APCs). To induce immune stimulatory activity, we used directed evolution methods to generate a HLH peptide that binds to CTLA-4, inhibiting the CTLA-4-B7-1 interaction and inducing immune stimulatory activity. Yeast-displayed libraries of HLH peptides were constructed and screened against CTLA-4 and identified the binding peptide Y-2, which exhibits a moderate affinity. The affinity of Y-2 was improved by in vitro affinity maturation to afford a stronger binder, ERY2-4. Peptide ERY2-4 specifically bound to CTLA-4 with a KD of 196.8 ± 2.3 nM, comparable to the affinity of the CTLA-4-B7-1 interaction. Furthermore, ERY2-4 inhibited the CTLA-4-B7-1 interaction with an IC50 of 1.1 ± 0.03 μM and blocked the interaction between CTLA-4 and dendritic cells (DCs) presenting B7 on their surface. Importantly, ERY2-4 showed no cross-reactivity against CD28, suggesting it does not suppress T-cell activation. Finally, in a mixed lymphocyte reaction assay with DCs and T cells, ERY2-4 enhanced an allogeneic lymphocyte response. Since CTLA-4 is a critical immune checkpoint for restricting the cancer immune response, this inhibitory HLH peptide represents a new class of drug candidates for immunotherapy.
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Affiliation(s)
- Tharanga M.R. Ramanayake Mudiyanselage
- Department of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-oraikita, Izumisano, Osaka 598-8531, Japan
| | - Masataka Michigami
- Department of Biological Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Zhengmao Ye
- Department of Biological Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Atsuko Uyeda
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Norimitsu Inoue
- Department of Tumor Immunology, Osaka International Cancer Institute, 3-1-69 Otemae, Chuo-ku, Osaka-shi, Osaka 541-8567, Japan
| | - Kikuya Sugiura
- Department of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-oraikita, Izumisano, Osaka 598-8531, Japan
| | - Ikuo Fujii
- Department of Biological Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Daisuke Fujiwara
- Department of Biological Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
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Automated Single-Cell Analysis and Isolation System: A Paradigm Shift in Cell Screening Methods for Bio-medicines. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1068:7-17. [DOI: 10.1007/978-981-13-0502-3_2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Nishihara T, Kitada H, Fujiwara D, Fujii I. Macrocyclization and labeling of helix-loop-helix peptide with intramolecular bis-thioether linkage. Biopolymers 2017; 106:415-21. [PMID: 26917088 DOI: 10.1002/bip.22826] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2015] [Revised: 01/27/2016] [Accepted: 02/13/2016] [Indexed: 11/07/2022]
Abstract
Conformationally constrained peptides have been developed as an inhibitor for protein-protein interactions (PPIs), and we have de novo designed cyclized helix-loop-helix (cHLH) peptide with a disulfide bond consisting of 40 amino acids to generate molecular-targeting peptides. However, synthesis of long peptides has sometimes resulted in low yield according to the respective amino acid sequences. Here we developed a method for efficient synthesis and labeling for cHLH peptides. First, we synthesized two peptide fragments and connected them by the copper-mediated alkyne and azide cycloaddition (CuAAC) reaction. Cyclization was performed by bis-thioether linkage using 1,3-dibromomethyl-5-propargyloxybenzene, and subsequently, the cHLH peptide was labeled with an azide-labeled probe. Finally, we designed and synthesized a peptide inhibitor for the p53-HDM2 interaction using a structure-guided design and successfully labeled it with a fluorescent probe or a functional peptide, respectively, by click chemistry. This macrocyclization and labeling method for cHLH peptide would facilitate the discovery of de novo bioactive ligands and therapeutic leads. © 2016 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 106: 415-421, 2016.
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Affiliation(s)
- Toshio Nishihara
- Department of Biological Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan
| | - Hidekazu Kitada
- Department of Biological Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan
| | - Daisuke Fujiwara
- Department of Biological Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan
| | - Ikuo Fujii
- Department of Biological Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan
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