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Kazantsev A, Bakulina O, Dar'in D, Kantin G, Bunev A, Krasavin M. Unexpected Ring Contraction of Homophthalic Anhydrides under Diazo Transfer Conditions. Org Lett 2022; 24:4762-4765. [PMID: 35749721 DOI: 10.1021/acs.orglett.2c01730] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An attempted Regitz diazo transfer onto homophthalic anhydride led to the discovery of an unexpected ring contraction, which gave N-sulfonyl phthalide-3-carboxamide derivatives. The reaction is thought to proceed via a [3 + 2] cycloaddition of the substrate's enol form and the azide followed by a two-step fragmentation of the intermediate 1,2,3-triazoline with a loss of the nitrogen molecule.
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Affiliation(s)
- Alexander Kazantsev
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Olga Bakulina
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Dmitry Dar'in
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Grigory Kantin
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Alexander Bunev
- Medicinal Chemistry Center, Togliatti State University, 445020 Togliatti, Russian Federation
| | - Mikhail Krasavin
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation.,Immanuel Kant Baltic Federal University, Kaliningrad 236016, Russian Federation
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2
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Tsuji K, Ishii T, Kobayakawa T, Ohashi N, Nomura W, Tamamura H. Fluorescence resonance energy transfer-based screening for protein kinase C ligands using 6-methoxynaphthalene-labeled 1,2-diacylglycerol-lactones. Org Biomol Chem 2021; 19:8264-8271. [PMID: 34338277 DOI: 10.1039/d1ob00814e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Protein kinase C (PKC) is associated with a central cellular signal transduction pathway and disorders such as cancer and Alzheimer-type dementia and is therefore a target for the treatment of these diseases. The development of simple methods suitable for high-throughput screening to find potent PKC ligands is desirable. We have developed an assay based on fluorescence-quenching screening with a solvatochromic fluorophore attached to a competitive probe and its alternative method based on Förster/fluorescence resonance energy transfer (FRET) phenomena. Here, an improved FRET-based PKC binding assay using a diacylglycerol (DAG) lactone labeled with a donor fluorescent dye, 6-methoxynaphthalene (6MN), was developed. The 6MN-labeled DAG-lactone has a higher binding affinity for the PKCδ C1b domain and the fluorescent PKCδ C1b domain labeled by fluorescein as an acceptor fluorescent dye (Fl-δC1b) than the diethylaminocoumarin (DEAC)-labeled DAG-lactone. The combination of the 6MN-labeled DAG-lactone and Fl-δC1b showed a change in fluorescence response larger than that of the DEAC-labeled DAG-lactone and Fl-δC1b. The IC50 values of known PKC ligands calculated by the present FRET-based method using 6MN-labeled DAG-lactone agree well with the Ki values obtained by the conventional radioisotope-based assays. Some false positive compounds, identified by the previous solvatochromic fluorophore-based method, were found to be negative by this method. The present FRET-based PKC binding assay is more sensitive and could be more useful.
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Affiliation(s)
- Kohei Tsuji
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan.
| | - Takahiro Ishii
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan.
| | - Takuya Kobayakawa
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan.
| | - Nami Ohashi
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan.
| | - Wataru Nomura
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan.
| | - Hirokazu Tamamura
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan.
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3
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De Simone A, Naldi M, Tedesco D, Bartolini M, Davani L, Andrisano V. Advanced analytical methodologies in Alzheimer’s disease drug discovery. J Pharm Biomed Anal 2020; 178:112899. [DOI: 10.1016/j.jpba.2019.112899] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 09/25/2019] [Accepted: 09/26/2019] [Indexed: 12/13/2022]
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4
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Wang J, Li X, Cheng JP. Quinine-derived thiourea promoted enantioselective Michael addition reactions of 3-substituted phthalides to maleimides. Sci China Chem 2019. [DOI: 10.1007/s11426-018-9393-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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5
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Nakamura Y, Yoshida S, Hosoya T. Facile Synthesis of Phthalides from Methyl ortho-Iodobenzoates and Ketones via an Iodine–Magnesium Exchange Reaction Using a Silylmethyl Grignard Reagent. CHEM LETT 2017. [DOI: 10.1246/cl.170211] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Yu Nakamura
- Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062
| | - Suguru Yoshida
- Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062
| | - Takamitsu Hosoya
- Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062
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Ohyoshi T, Tamura Y, Hayakawa I, Hirai G, Miyazawa Y, Funakubo S, Sodeoka M, Kigoshi H. Total synthesis of natural derivatives and artificial analogs of 13-oxyingenol and their biological evaluation. Org Biomol Chem 2016; 14:11426-11437. [DOI: 10.1039/c6ob02268e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Natural derivatives and artificial analogs of 13-oxyingenol were synthesized, and these analogs induced HL-60 differentiation and apoptosis.
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Affiliation(s)
- Takayuki Ohyoshi
- Department of Chemistry
- Graduate School of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba 305-8571
- Japan
| | - Yuki Tamura
- Synthetic Organic Chemistry Laboratory
- Wako
- Japan
| | - Ichiro Hayakawa
- Division of Applied Chemistry
- Graduate School of Natural Science and Technology
- Okayama University
- Okayama 700-8530
- Japan
| | - Go Hirai
- Synthetic Organic Chemistry Laboratory
- Wako
- Japan
- RIKEN Center for Sustainable Resource Science
- Wako
| | - Yamato Miyazawa
- Department of Chemistry
- Graduate School of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba 305-8571
- Japan
| | - Shota Funakubo
- Department of Chemistry
- Graduate School of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba 305-8571
- Japan
| | - Mikiko Sodeoka
- Synthetic Organic Chemistry Laboratory
- Wako
- Japan
- RIKEN Center for Sustainable Resource Science
- Wako
| | - Hideo Kigoshi
- Department of Chemistry
- Graduate School of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba 305-8571
- Japan
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7
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Hirai G, Asanuma M, Tsuchiya A, Sodeoka M. Development of Dual-specificity Protein Phosphatases Inhibitors based on Focused Library Approach: Modification of a Core Structure and Unique Inhibition Mechanism. J SYN ORG CHEM JPN 2016. [DOI: 10.5059/yukigoseikyokaishi.74.532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Go Hirai
- Synthetic Organic Chemistry Laboratory, RIKEN; RIKEN CSRS
| | | | | | - Mikiko Sodeoka
- Synthetic Organic Chemistry Laboratory, RIKEN; RIKEN CSRS
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8
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Hirai G, Sodeoka M. Focused library with a core structure extracted from natural products and modified: application to phosphatase inhibitors and several biochemical findings. Acc Chem Res 2015; 48:1464-73. [PMID: 25894598 DOI: 10.1021/acs.accounts.5b00048] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Synthesis of a focused library is an important strategy to create novel modulators of specific classes of proteins. Compounds in a focused library are composed of a common core structure and different diversity structures. In this Account, we describe our design and synthesis of libraries focused on selective inhibitors of protein phosphatases (PPases). We considered that core structures having structural and electronic features similar to those of PPase substrates, phosphate esters, would be a reasonable choice. Therefore, we extracted core structures from natural products already identified as PPase inhibitors. Since many PPases share similar active-site structures, such phosphate-mimicking core structures should interact with many enzymes in the same family, and therefore the choice of diversity structures is pivotal both to increase the binding affinity and to achieve specificity for individual enzymes. Here we present case studies of application of focused libraries to obtain PPase inhibitors, covering the overall process from selection of core structures to identification and evaluation of candidates in the focused libraries. To synthesize a library focused on protein serine-threonine phosphatases (PPs), we chose norcantharidin as a core structure, because norcantharidin dicarboxylate shows a broad inhibition profile toward several PPs. From the resulting focused library, we identified a highly selective PP2B inhibitor, NCA-01. On the other hand, to find inhibitors of dual-specificity protein phosphatases (DSPs), we chose 3-acyltetronic acid extracted from natural product RK-682 as a core structure, because its structure resembles the transition state in the dephosphorylation reaction of DSPs. However, a highly selective inhibitor was not found in the resulting focused library. Furthermore, an inherent drawback of compounds having the highly acidic 3-acyltetronic acid as a core structure is very weak potency in cellulo, probably due to poor cell membrane permeability. Therefore, we next modified the core structure from acidic to neutral by transformation to the enamine derivative and constructed a second-generation focused library (RE derivatives). The resulting compounds showed dramatically improved cell membrane permeability and inhibitory selectivity and included VHR (vaccinia VH1-related)-selective RE12 and CDC25A/B (cell division cycle 25A/B)-selective RE44. These inhibitors act on target enzymes in cellulo and do not generate reactive oxygen species, which is a potential problem with quinoid-type inhibitors of CDC25s. The cellular activity of RE12 was further improved by replacement of the side chain to afford RE176, which showed more potent antiproliferative activity than RE12 against HeLa cells. The dramatic change of inhibitory selectivity obtained by core structure modification from 3-acyltetronic acid to its enamine derivative was associated with a change in the mode of action. Namely, RE derivatives were found to be noncompetitive inhibitors with respect to a small-molecular substrate of CDC25A/B, whereas RK-682 was a competitive inhibitor of VHR. We identified the binding site of RE derivatives on the CDC25A as a pocket adjacent to the active site; this appears to be a promising target site for development of further novel inhibitors of CDC25s.
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Affiliation(s)
- Go Hirai
- Synthetic Organic Chemistry
Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- CREST-JST, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Mikiko Sodeoka
- Synthetic Organic Chemistry
Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- CREST-JST, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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9
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Rossi D, Talman V, Gennäs GBA, Marra A, Picconi P, Nasti R, Serra M, Ann J, Amadio M, Pascale A, Tuominen RK, Yli-Kauhaluoma J, Lee J, Collina S. Beyond the affinity for protein kinase C: exploring 2-phenyl-3-hydroxypropyl pivalate analogues as C1 domain-targeting ligands. MEDCHEMCOMM 2015. [DOI: 10.1039/c4md00564c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Over the past fifteen years, we reported the design and synthesis of different series of compounds targeting the C1 domain of protein kinase C (PKC) that were based on various templates.
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10
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Hirai G. Mimicking/extracting structure and functions of natural products: synthetic approaches that address unexplored needs in chemical biology. CHEM REC 2014; 15:445-56. [PMID: 25504785 DOI: 10.1002/tcr.201402074] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Indexed: 12/19/2022]
Abstract
Natural products are often attractive and challenging targets for synthetic chemists, and many have interesting biological activities. However, synthetic chemists need to be more than simply suppliers of compounds to biologists. Therefore, we have been seeking ways to actively apply organic synthetic methods to chemical biology studies of natural products and their activities. In this personal review, I would like to introduce our work on the development of new biologically active compounds inspired by, or extracted from, the structures of natural products, focusing on enhancement of functional activity and specificity and overcoming various drawbacks of the parent natural products.
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Affiliation(s)
- Go Hirai
- Synthetic Organic Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan; RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan.
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11
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Ohashi N, Nomura W, Minato N, Tamamura H. Screening for protein kinase C ligands using fluorescence resonance energy transfer. Chem Pharm Bull (Tokyo) 2014; 62:1019-25. [PMID: 25109829 DOI: 10.1248/cpb.c14-00419] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Protein kinase C (PKC) is correlated with cell signaling pathways and also receives attention as a therapeutic target for cancer and Alzheimer-type dementia. The application of Förster/fluorescence resonance energy transfer (FRET) phenomena to detect binding between proteins and small molecules, for example, PKC and its ligands, underlies a fluorescence-based assay method suitable for high-throughput screening. To accelerate studies on PKC functions in processing signals using small molecules and the development of drugs that target PKC, novel methods for the assessment of the PKC binding affinity of compounds are necessary. We previously developed solvatochromic fluorophore-based methods for that assessment. In this study, a novel method for a FRET-based PKC binding assay was developed and is expected to overcome the limitations of solvatochromic fluorophores.
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Affiliation(s)
- Nami Ohashi
- Department of Medicinal Chemistry, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University
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12
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Luo J, Jiang C, Wang H, Xu LW, Lu Y. Direct asymmetric Michael addition of phthalide derivatives to chalcones. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.07.108] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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13
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Luo J, Wang H, Zhong F, Kwiatkowski J, Xu LW, Lu Y. Highly diastereoselective and enantioselective direct Michael addition of phthalide derivatives to nitroolefins. Chem Commun (Camb) 2013; 49:5775-7. [DOI: 10.1039/c3cc42187b] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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14
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de Lichtervelde L, Antal CE, Boitano AE, Wang Y, Krastel P, Petersen F, Newton AC, Cooke MP, Schultz PG. Euphohelioscopin A is a PKC activator capable of inducing macrophage differentiation. ACTA ACUST UNITED AC 2012; 19:994-1000. [PMID: 22921066 DOI: 10.1016/j.chembiol.2012.06.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Revised: 06/01/2012] [Accepted: 06/11/2012] [Indexed: 01/27/2023]
Abstract
To identify small molecules that selectively control hematopoietic stem cell differentiation, we performed an unbiased screen using primary human CD34(+) cells. We identified a plant-derived natural product, euphohelioscopin A, capable of selectively differentiating CD34(+) cells down the granulocyte/monocytic lineage. Euphohelioscopin A also inhibits proliferation and induces differentiation of the myeloid leukemia cell lines THP-1 and HL-60. Mechanistic studies revealed that euphohelioscopin A is an activator of protein kinase C (PKC), and that the promonocytic effects of this natural product are mediated by PKC activation. In addition to shedding insights into normal hematopoiesis, this work may ultimately facilitate the application of stem cell therapies to a host of myeloid dysfunctions.
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Affiliation(s)
- Lorenzo de Lichtervelde
- Department of Chemistry, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA
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15
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Zhong F, Luo J, Chen GY, Dou X, Lu Y. Highly Enantioselective Regiodivergent Allylic Alkylations of MBH Carbonates with Phthalides. J Am Chem Soc 2012; 134:10222-7. [DOI: 10.1021/ja303115m] [Citation(s) in RCA: 172] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Fangrui Zhong
- Department of Chemistry & Medicinal Chemistry Program, Life Sciences Institute, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Jie Luo
- Department of Chemistry & Medicinal Chemistry Program, Life Sciences Institute, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Guo-Ying Chen
- Department of Chemistry & Medicinal Chemistry Program, Life Sciences Institute, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Xiaowei Dou
- Department of Chemistry & Medicinal Chemistry Program, Life Sciences Institute, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Yixin Lu
- Department of Chemistry & Medicinal Chemistry Program, Life Sciences Institute, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
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Luo J, Wang H, Zhong F, Kwiatkowski J, Xu LW, Lu Y. Direct asymmetric Mannich reaction of phthalides: facile access to chiral substituted isoquinolines and isoquinolinones. Chem Commun (Camb) 2012; 48:4707-9. [DOI: 10.1039/c2cc31439h] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Hirai G. Development of Novel Types of Biologically Active Compounds Based on Natural Products and Biomolecules. YAKUGAKU ZASSHI 2012; 132:117-24. [DOI: 10.1248/yakushi.132.117] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Go Hirai
- Synthetic Organic Chemistry Laboratory, RIKEN Advanced Science Institute
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18
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Hirai G, Ohkubo M, Tamura Y, Sodeoka M. Design and synthesis of protein kinase Cα activators based on ‘out of pocket’ interactions. Bioorg Med Chem Lett 2011; 21:3587-90. [DOI: 10.1016/j.bmcl.2011.04.108] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2011] [Revised: 04/21/2011] [Accepted: 04/25/2011] [Indexed: 11/28/2022]
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Nomura W, Ohashi N, Okuda Y, Narumi T, Ikura T, Ito N, Tamamura H. Fluorescence-quenching screening of protein kinase C ligands with an environmentally sensitive fluorophore. Bioconjug Chem 2011; 22:923-30. [PMID: 21434694 DOI: 10.1021/bc100567k] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel fluorescence-quenching screening method for protein kinase C (PKC) ligands was developed utilizing solvatochromic fluorophores. Solvatochromic dyes, highly sensitive to the presence or the absence of competitive ligands in their binding to the C1b domain of PKCδ (δC1b), were combined with a known pharmacophoric moiety of 1,2-diacylglycerol (DAG) lactones, PKC ligands. Addition of δC1b to the fluorescent compounds caused a gradual increase in the fluorescent intensity in proportion to the increase of δC1b. As a competitive ligand was added to the complex of δC1b domain and fluorescent compounds, a gradual decrease in the fluorescent intensity was observed. The relative binding affinities of known ligands were successfully determined by this fluorescent method and corresponded well to the K(i) values measured by a radioisotope method. These results indicate that washing, which is a laborious step in binding evaluations, is not required for this environmentally sensitive fluorophore based system. Screening with the system was performed for 2560 preselected library compounds with possible pharmacophores, and some lead compounds were found. This fluorescence-based method could be applied widely to known ligand-receptor combinations.
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Affiliation(s)
- Wataru Nomura
- Department of Medicinal Chemistry, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo, Japan
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Hirai G, Ogoshi Y, Ohkubo M, Tamura Y, Watanabe T, Shimizu T, Sodeoka M. Asymmetric synthesis of isobenzofuranone derivatives and their unique character as protein kinase Cα (PKCα) activators. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.03.069] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Affiliation(s)
- Christian E. Madu
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019
| | - Carl J. Lovely
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019
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22
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Hirai G, Shimizu T, Watanabe T, Ogoshi Y, Ohkubo M, Sodeoka M. Importance of Interaction between C1 Domain and Lipids in Protein Kinase Cα Activation: Hydrophobic Side Chain Direction in Isobenzofuranone Ligands Controls Enzyme Activation Level. ChemMedChem 2007; 2:1006-9. [PMID: 17492704 DOI: 10.1002/cmdc.200700080] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Go Hirai
- Synthetic Organic Chemistry Laboratory, RIKEN, 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan
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Yamatsugu K, Motoki R, Kanai M, Shibasaki M. Identification of potent, selective protein kinase C inhibitors based on a phorbol skeleton. Chem Asian J 2007; 1:314-21. [PMID: 17441066 DOI: 10.1002/asia.200600185] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The elucidation of specific functions of protein kinase C (PKC) subtypes in physiological processes is an important challenge for the future development of new drug targets. Subtype-selective PKC agonists and antagonists are useful biological tools for this purpose. Most of the currently used PKC modulators elicit their activities through binding to the ATP binding site of PKC, which shares many features with other kinases. PKC modulators that target the PKC regulatory domain are considered to be advantageous in terms of selectivity, because the structure of the regulatory domain is intrinsic to each PKC subtype. In this paper, we describe the identification of new potent and conventional PKC-selective inhibitors that target the regulatory domain. The inhibitors contain a phorbol skeleton, a naturally occurring potent and selective PKC regulatory domain binder, with a perfluorinated alkyl group and a polyether hydrophilic chain on a terephthaloyl aromatic ring at the C12 position. Both of these substituents are essential for the potent inhibitory activity. Specifically, the binding affinity between PKC and the phorbol ester analogues was improved by an electron-deficient aromatic ring at C12. This finding cannot be explained by the previously proposed binding model and suggests a new binding mode between phorbol esters and PKC.
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Affiliation(s)
- Kenzo Yamatsugu
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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24
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Maurya SK, Hotha S. Synthesis of spiroannulated dihydroisobenzofuranylated monosaccharides. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.03.016] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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25
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Sun MK, Alkon DL. Protein kinase C substrate activators: potential as novel antidepressants. Drug Dev Res 2005. [DOI: 10.1002/ddr.20019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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