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Suminda GGD, Min Y, Ha MW, Ghosh M, Lee DS, Son YO. In vitro and in vivo investigations on arsenic-induced cartilage degeneration in osteoarthritis. J Hazard Mater 2024; 461:132570. [PMID: 37742380 DOI: 10.1016/j.jhazmat.2023.132570] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 09/14/2023] [Accepted: 09/15/2023] [Indexed: 09/26/2023]
Abstract
Heavy metals found in the environment, including arsenic (As) pose significant risks to human health and present a risk factor for osteoarthritis (OA). This study researched the impact of As on cartilage degeneration by focusing on the role of As in causing OA in mice. We employed chemical inhibition and inductively coupled plasma mass spectrometry analyses to identify the effect of As on chondrocytes as well as studying its accumulation in organs after oral administration in mice. Additionally, the study examined the effect of intra-articular As treatment on the levels of crucial catabolic factors, namely Hif-2α (Epas1) and Zip8 (Slc39a8), during OA progression. Mice that were administered As orally in conjunction with surgically induced joint instability, had heightened cartilage destruction compared to wild-type mice. Quantitative analysis revealed a significant increase in Hif-2α and Zip8 mRNA expression (p = 0.0352,0.0004 respectively) and protein expression (p = 0.0101,0.008 respectively) post oral administration. Our findings illustrated the role of As in influencing crucial cellular functions that are triggered by reactive oxygen species. These events consequently activate the Akt/Hif-2α/NF-κB pathways, leading to disruptions in articular cartilage homeostasis. This study provides a comprehensive understanding of the impact of As on the development of osteoarthritis.
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Affiliation(s)
| | - Yunhui Min
- Interdisciplinary Graduate Program in Advanced Convergence Technology and Science, Jeju National University, Jeju-si 63243, Republic of Korea
| | - Min Woo Ha
- Interdisciplinary Graduate Program in Advanced Convergence Technology and Science, Jeju National University, Jeju-si 63243, Republic of Korea; Jeju Research Institute of Pharmaceutical Sciences, College of Pharmacy, Jeju National University, Jeju-si 63243, Republic of Korea
| | - Mrinmoy Ghosh
- Department of Animal Biotechnology, Faculty of Biotechnology, College of Applied Life Sciences Jeju National University, Jeju-si 63243, Republic of Korea; Department of Biotechnology, School of Bio, Chemical and Processing Engineering (SBCE), Kalasalin-gam Academy of Research and Educational, Krishnankoil 626126, India
| | - Dong-Sun Lee
- Interdisciplinary Graduate Program in Advanced Convergence Technology and Science, Jeju National University, Jeju-si 63243, Republic of Korea; Health Materials Core-Facility Center, Jeju National University, Jeju-si 63243, Republic of Korea; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju, Republic of Korea; Practical Translational Research Center, Jeju National University, Jeju 63243, Republic of Korea.
| | - Young-Ok Son
- Interdisciplinary Graduate Program in Advanced Convergence Technology and Science, Jeju National University, Jeju-si 63243, Republic of Korea; Department of Animal Biotechnology, Faculty of Biotechnology, College of Applied Life Sciences Jeju National University, Jeju-si 63243, Republic of Korea; Health Materials Core-Facility Center, Jeju National University, Jeju-si 63243, Republic of Korea; Practical Translational Research Center, Jeju National University, Jeju 63243, Republic of Korea.
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Rampogu S, Jung TS, Ha MW, Lee KW. Repurposing and computational design of PARP inhibitors as SARS-CoV-2 inhibitors. Sci Rep 2023; 13:10583. [PMID: 37386052 PMCID: PMC10310815 DOI: 10.1038/s41598-023-36342-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 06/01/2023] [Indexed: 07/01/2023] Open
Abstract
Coronavirus disease 2019 (COVID-19) is a recent pandemic that caused serious global emergency. To identify new and effective therapeutics, we employed a drug repurposing approach. The poly (ADP ribose) polymerase inhibitors were used for this purpose and were repurposed against the main protease (Mpro) target of severe acute respiratory syndrome Coronavirus 2 (SARS-CoV-2). The results from these studies were used to design compounds using the 'Grow Scaffold' modules available on Discovery Studio v2018. The three designed compounds, olaparib 1826 and olaparib 1885, and rucaparib 184 demonstrated better CDOCKER docking scores for Mpro than their parent compounds. Moreover, the compounds adhered to Lipinski's rule of five and demonstrated a synthetic accessibility score of 3.55, 3.63, and 4.30 for olaparib 1826, olaparib 1885, and rucaparib 184, respectively. The short-range Coulombic and Lennard-Jones potentials also support the potential binding of the modified compounds to Mpro. Therefore, we propose these three compounds as novel SARS-CoV-2 inhibitors.
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Affiliation(s)
- Shailima Rampogu
- Department of Bio and Medical Big Data (BK4 Program), Division of Life Sciences, Research Institute of Natural Science (RINS), Gyeongsang National University (GNU), Jinju, Republic of Korea.
| | - Tae Sung Jung
- Laboratory of Aquatic Animal Diseases, College of Veterinary Medicine, Research Institute of Natural Science, Gyeongsang National University, Jinju, 52828, Republic of Korea.
| | - Min Woo Ha
- Interdisciplinary Graduate Program in Advanced Convergence Technology and Science, Jeju National University, 102 Jejudaehak-ro, Jeju, 63243, Republic of Korea.
| | - Keun Woo Lee
- Department of Bio and Medical Big Data (BK4 Program), Division of Life Sciences, Research Institute of Natural Science (RINS), Gyeongsang National University (GNU), Jinju, Republic of Korea.
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Singh P, Kumar V, Lee G, Jung TS, Ha MW, Hong JC, Lee KW. Pharmacophore-Oriented Identification of Potential Leads as CCR5 Inhibitors to Block HIV Cellular Entry. Int J Mol Sci 2022; 23:ijms232416122. [PMID: 36555761 PMCID: PMC9784205 DOI: 10.3390/ijms232416122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/14/2022] [Accepted: 12/14/2022] [Indexed: 12/23/2022] Open
Abstract
Cysteine-cysteine chemokine receptor 5 (CCR5) has been discovered as a co-receptor for cellular entry of human immunodeficiency virus (HIV). Moreover, the role of CCR5 in a variety of cancers and various inflammatory responses was also discovered. Despite the fact that several CCR5 antagonists have been investigated in clinical trials, only Maraviroc has been licensed for use in the treatment of HIV patients. This indicates that there is a need for novel CCR5 antagonists. Keeping this in mind, the present study was designed. The active CCR5 inhibitors with known IC50 value were selected from the literature and utilized to develop a ligand-based common feature pharmacophore model. The validated pharmacophore model was further used for virtual screening of drug-like databases obtained from the Asinex, Specs, InterBioScreen, and Eximed chemical libraries. Utilizing computational methods such as molecular docking studies, molecular dynamics simulations, and binding free energy calculation, the binding mechanism of selected inhibitors was established. The identified Hits not only showed better binding energy when compared to Maraviroc, but also formed stable interactions with the key residues and showed stable behavior throughout the 100 ns MD simulation. Our findings suggest that Hit1 and Hit2 may be potential candidates for CCR5 inhibition, and, therefore, can be considered for further CCR5 inhibition programs.
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Affiliation(s)
- Pooja Singh
- Division of Applied Life Science (BK21 Four), Plant Molecular Biology and Biotechnology Research Center (PMBBRC), Gyeongsang National University (GNU), 501 Jinju-daero, Jinju 52828, Republic of Korea
| | - Vikas Kumar
- Department of Bio & Medical Big Data (BK), Division of Life Sciences, Research Institute of Natural Science (RINS), Gyeongsang National University (GNU), 501 Jinju-daero, Jinju 52828, Republic of Korea
| | - Gihwan Lee
- Division of Applied Life Science (BK21 Four), ABC-RLRC, PMBBRC, Gyeongsang National University (GNU), 501 Jinju-daero, Jinju 52828, Republic of Korea
| | - Tae Sung Jung
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Min Woo Ha
- Jeju Research Institute of Pharmaceutical Sciences, College of Pharmacy, Jeju National University, Jeju 63243, Republic of Korea
| | - Jong Chan Hong
- Division of Applied Life Science (BK21 Four), Plant Molecular Biology and Biotechnology Research Center (PMBBRC), Gyeongsang National University (GNU), 501 Jinju-daero, Jinju 52828, Republic of Korea
- Correspondence: (J.C.H.); (K.W.L.)
| | - Keun Woo Lee
- Department of Bio & Medical Big Data (BK), Division of Life Sciences, Research Institute of Natural Science (RINS), Gyeongsang National University (GNU), 501 Jinju-daero, Jinju 52828, Republic of Korea
- Correspondence: (J.C.H.); (K.W.L.)
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Kumar V, Parate S, Danishuddin, Zeb A, Singh P, Lee G, Jung TS, Lee KW, Ha MW. 3D-QSAR-Based Pharmacophore Modeling, Virtual Screening, and Molecular Dynamics Simulations for the Identification of Spleen Tyrosine Kinase Inhibitors. Front Cell Infect Microbiol 2022; 12:909111. [PMID: 35846777 PMCID: PMC9280624 DOI: 10.3389/fcimb.2022.909111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 05/30/2022] [Indexed: 11/13/2022] Open
Abstract
Spleen tyrosine kinase (SYK) is an essential mediator of immune cell signaling and has been anticipated as a therapeutic target for autoimmune diseases, notably rheumatoid arthritis, allergic rhinitis, asthma, and cancers. Significant attempts have been undertaken in recent years to develop SYK inhibitors; however, limited success has been achieved due to poor pharmacokinetics and adverse effects of inhibitors. The primary goal of this research was to identify potential inhibitors having high affinity, selectivity based on key molecular interactions, and good drug-like properties than the available inhibitor, fostamatinib. In this study, a 3D-QSAR model was built for SYK based on known inhibitor IC50 values. The best pharmacophore model was then used as a 3D query to screen a drug-like database to retrieve hits with novel chemical scaffolds. The obtained compounds were subjected to binding affinity prediction using the molecular docking approach, and the results were subsequently validated using molecular dynamics (MD) simulations. The simulated compounds were ranked according to binding free energy (ΔG), and the binding affinity was compared with fostamatinib. The binding mode analysis of selected compounds revealed that the hit compounds form hydrogen bond interactions with hinge region residue Ala451, glycine-rich loop residue Lys375, Ser379, and DFG motif Asp512. Identified hits were also observed to form a desirable interaction with Pro455 and Asn457, the rare feature observed in SYK inhibitors. Therefore, we argue that identified hit compounds ZINC98363745, ZINC98365358, ZINC98364133, and ZINC08789982 may help in drug design against SYK.
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Ha MW, Kim J, Paek SM. Recent Achievements in Total Synthesis for Integral Structural Revisions of Marine Natural Products. Mar Drugs 2022; 20:md20030171. [PMID: 35323470 PMCID: PMC8951824 DOI: 10.3390/md20030171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 02/20/2022] [Accepted: 02/21/2022] [Indexed: 02/01/2023] Open
Abstract
A great effort to discover new therapeutic ingredients is often initiated through the discovery of the existence of novel marine natural products. Since substances produced by the marine environment might be structurally more complex and unique than terrestrial natural products, there have been cases of misassignments of their structures despite the availability of modern spectroscopic and computational chemistry techniques. When it comes to refutation to erroneously or tentatively proposed structures empirical preparations through organic chemical synthesis has the greatest contribution along with close and sophiscated inspection of spectroscopic data. Herein, we analyzed the total synthetic studies that have decisively achieved in revelation of errors, ambiguities, or incompleteness of the isolated structures of marine natural products covering the period from 2018 to 2021.
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Affiliation(s)
- Min Woo Ha
- Jeju Research Institute of Pharmaceutical Sciences, College of Pharmacy, Jeju National University, 102 Jejudaehak-ro, Jeju 63243, Jeju-do, Korea;
- Interdisciplinary Graduate Program in Advanced Convergence Technology & Science, Jeju National University, 102 Jejudaehak-ro, Jeju 63243, Jeju-do, Korea
| | - Jonghoon Kim
- Department of Chemistry, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Korea;
| | - Seung-Mann Paek
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, 501 Jinju-daero, Jinju 52828, Gyeongnam-do, Korea
- Correspondence: ; Tel.: +82-55-772-2424
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Lee J, Ban JW, Kim J, Yang S, Lee G, Dhorma LP, Kim MH, Ha MW, Hong S, Park HG. Asymmetric Phase-Transfer Catalytic aza-Michael Addition to Cyclic Enone: Highly Enantioselective and Diastereoselective Synthesis of Cyclic 1,3-Aminoalcohols. Org Lett 2022; 24:1647-1651. [PMID: 35175781 DOI: 10.1021/acs.orglett.2c00192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The highly enantioselective aza-Michael reaction of tert-butyl β-naphthylmethoxycarbamate to cyclic enones has been accomplished by using a new cinchona alkaloid derived C(9)-urea ammonium catalyst under phase-transfer catalysis conditions with up to 98% ee at 0 °C. The resulting aza-Michael adducts can be converted to versatile intermediates by selective deprotection and the cyclic 1,3-aminoalcohols by diastereoselective reduction with up to 32:1, which have been widely used as important pharmacophores in pharmaceutical development.
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Affiliation(s)
- Jaeyong Lee
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Jeong Woo Ban
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Jeongseok Kim
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Sehun Yang
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Geumwoo Lee
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Lama Prema Dhorma
- College of Pharmacy, Gachon University, 191 Hambakmoero, Yeonsu-gu, Incheon 21936, Republic of Korea
| | - Mi-Hyun Kim
- College of Pharmacy, Gachon University, 191 Hambakmoero, Yeonsu-gu, Incheon 21936, Republic of Korea
| | - Min Woo Ha
- Jeju Research Institute of Pharmaceutical Sciences, College of Pharmacy and Interdisciplinary Graduate Program in Advanced Convergence Technology & Science, Jeju National University, 102 Jejudaehak-ro, Jeju 63243, Republic of Korea
| | - Suckchang Hong
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Hyeung-Geun Park
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
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Kulkarni AM, Parate S, Lee G, Kim Y, Jung TS, Lee KW, Ha MW. Computational Simulations Highlight the IL2Rα Binding Potential of Polyphenol Stilbenes from Fenugreek. Molecules 2022; 27:molecules27041215. [PMID: 35209009 PMCID: PMC8880457 DOI: 10.3390/molecules27041215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 02/04/2022] [Accepted: 02/07/2022] [Indexed: 11/16/2022] Open
Abstract
Widely used in global households, fenugreek is well known for its culinary and medicinal uses. The various reported medicinal properties of fenugreek are by virtue of the different natural phytochemicals present in it. Regarded as a promising target, interleukin 2 receptor subunit alpha (IL2Rα) has been shown to influence immune responses. In the present research, using in silico techniques, we have demonstrated the potential IL2Rα binding properties of three polyphenol stilbenes (desoxyrhaponticin, rhaponticin, rhapontigenin) from fenugreek. As the first step, molecular docking was performed to assess the binding potential of the fenugreek phytochemicals with IL2Rα. All three phytochemicals demonstrated interactions with active site residues. To confirm the reliability of our molecular docking results, 100 ns molecular dynamics simulations studies were undertaken. As discerned by the RMSD and RMSF analyses, IL2Rα in complex with the desoxyrhaponticin, rhaponticin, and rhapontigenin indicated stability. The RMSD analysis of the phytochemicals alone also demonstrated no significant structural changes. Based on the stable molecular interactions and comparatively slightly better MM/PBSA binding free energy, rhaponticin seems promising. Additionally, ADMET analysis performed for the stilbenes indicated that all of them obey the ADMET rules. Our computational study thus supports further in vitro IL2Rα binding studies on these stilbenes, especially rhaponticin.
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Affiliation(s)
- Apoorva M. Kulkarni
- Department of Bio & Medical Big Data (BK4 Program), Division of Life Science, Research Institute of Natural Science (RINS), Gyeongsang National University (GNU), 501 Jinju-daero, Jinju 52828, Korea;
| | - Shraddha Parate
- Division of Applied Life Science, Plant Molecular Biology and Biotechnology Research Center (PMBBRC), Gyeongsang National University (GNU), 501 Jinju-daero, Jinju 52828, Korea; (S.P.); (G.L.)
| | - Gihwan Lee
- Division of Applied Life Science, Plant Molecular Biology and Biotechnology Research Center (PMBBRC), Gyeongsang National University (GNU), 501 Jinju-daero, Jinju 52828, Korea; (S.P.); (G.L.)
| | - Yongseong Kim
- School of Cosmetics and Food Development, Kyungnam University, Masan 631-701, Korea;
| | - Tae Sung Jung
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501-201, 501 Jinju-daero, Jinju-si 52828, Gyeongsangnam-do, Korea;
| | - Keun Woo Lee
- Department of Bio & Medical Big Data (BK4 Program), Division of Life Science, Research Institute of Natural Science (RINS), Gyeongsang National University (GNU), 501 Jinju-daero, Jinju 52828, Korea;
- Correspondence: (K.W.L.); (M.W.H.)
| | - Min Woo Ha
- Jeju Research Institute of Pharmaceutical Sciences, College of Pharmacy, Jeju National University, 102 Jejudaehak-ro, Jeju 63243, Jeju-do, Korea
- Interdisciplinary Graduate Program in Advanced Convergence Technology & Science, Jeju National University, 102 Jejudaehak-ro, Jeju 63243, Jeju-do, Korea
- Correspondence: (K.W.L.); (M.W.H.)
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Lee AR, Park SB, Kim SW, Jung JW, Chun JH, Kim J, Kim YR, Lazarte JMS, Jang HB, Thompson KD, Jung M, Ha MW, Jung TS. Membrane vesicles (MVs) from antibiotic-resistant Staphylococcus aureus transfer antibiotic-resistance to antibiotic-susceptible Escherichia coli. J Appl Microbiol 2022; 132:2746-2759. [PMID: 35019198 PMCID: PMC9306644 DOI: 10.1111/jam.15449] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 01/03/2022] [Accepted: 01/08/2022] [Indexed: 11/03/2022]
Abstract
AIM Bacteria naturally produce membrane vesicles (MVs), which have been shown to contribute to the spread of multi-drug resistant bacteria (MDR) by delivering antibiotic-resistant substances to antibiotic-susceptible bacteria. Here, we aim to show that MVs from Gram-positive bacteria are capable of transferring β-lactam antibiotic-resistant substances to antibiotic-sensitive Gram-negative bacteria. MATERIALS AND METHODS MVs were collected from a methicillin-resistant strain of Staphylococcus aureus (MRSA) and vesicle-mediated fusion with antimicrobial-sensitive Escherichia coli (RC85). It was performed by exposing the bacteria to the MVs to develop antimicrobial-resistant E. coli (RC85-T). RESULTS The RC85-T exhibited a higher resistance to β-lactam antibiotics compared to the parent strain. Although the secretion rates of the MVs from RC85-T and the parent strain were nearly equal, the β-lactamase activity of the MVs from RC85-T was 12-times higher than that of MVs from the parent strain, based on equivalent protein concentrations. Moreover, MVs secreted by RC85-T were able to protect β-lactam-susceptible E. coli from β-lactam antibiotic-induced growth inhibition in a dose-dependent manner. CONCLUSION MVs play a role in transferring substances from Gram-positive to Gram-negative bacteria, shown by the release of MVs from RC85-T that were able to protect β-lactam-susceptible bacteria from β-lactam antibiotics. SIGNIFICANCE AND IMPACT OF STUDY MVs are involved in the emergence of antibiotic resistant strains in a mixed bacterial culture, helping us to understand how the spread of multidrug resistant bacteria could be reduced.
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Affiliation(s)
- Ae Rin Lee
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501-201, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do, Republic of Korea, 52828
| | - Seong Bin Park
- Coastal Research Extension Center, Mississippi State University, Mississippi State, MS, 39762, USA
| | - Si Won Kim
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501-201, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do, Republic of Korea, 52828
| | - Jae Wook Jung
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501-201, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do, Republic of Korea, 52828
| | - Jin Hong Chun
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501-201, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do, Republic of Korea, 52828
| | - Jaesung Kim
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501-201, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do, Republic of Korea, 52828
| | - Young Rim Kim
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501-201, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do, Republic of Korea, 52828
| | - Jassy Mary S Lazarte
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501-201, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do, Republic of Korea, 52828
| | - Ho Bin Jang
- Department of Microbiology, Institute for Viral Diseases, College of Medicine, Korea University, Seoul, Republic of Korea, 02841
| | - Kim D Thompson
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Penicuik, Midlothian, EH26 0PZ, UK
| | - Myunghwan Jung
- Department of Microbiology and Department of Convergence Medical Science, College of Medicine, Gyeongsang National University, Jinju, Republic of Korea
| | - Min Woo Ha
- College of Pharmacy, Jeju National University, Jeju, 63243, Republic of Korea
| | - Tae Sung Jung
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501-201, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do, Republic of Korea, 52828.,Centre for Marine Bioproducts Development, Flinders University, Bedford Park, SA, 5042, Australia
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Lee G, Lee JH, Lee J, Ha MW, Kim MH, Hong S, Park HG. Asymmetric Epoxidation of Enones: Effect of Surfactants, Radical Scavengers and Morphology of Catalysts on Reaction Rates, Chemical Yields and Enantioselectivities in Phase-Transfer Catalysis. Org Chem Front 2022. [DOI: 10.1039/d2qo00924b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly enantioselective epoxidation of enones has been accomplished with asymmetric phase-transfer catalysis (PTC) using cinchona alkaloid-derived meta-dimer catalysts. An intensive study of structure-reactivity relationships among catalysts and oxidants in terms...
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Yang J, Park Y, Yang S, Lee G, Ha MW, Kim MH, Hong S, Park HG. Enantioselective Total Synthesis of Nitraria Alkaloids: (+)-Nitramine, (+)-Isonitramine, (-)-Isonitramine, and (-)-Sibirine via Asymmetric Phase-Transfer Catalytic α-Allylations of α-Carboxylactams. J Org Chem 2021; 86:4375-4390. [PMID: 33464902 DOI: 10.1021/acs.joc.0c02573] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Many optically active 2-azaspirocyclic structures have frequently been found in biologically active natural products. In particular, Nitraria alkaloids, (+)-nitramine, (+)-isonitramine, (-)-isonitramine, and (-)-sibirine, have stereogenicity on their quaternary carbon of the 2-azaspiro[5,5]undecane-7-ol structure. To synthesize Nitraria alkaloids, we developed a new enantioselective synthetic method for chiral α-quaternary lactams via the α-alkylation of α-tert-butoxycarbonyl lactams. α-Alkylation of α-tert-butoxycarboxylactams in the circumstances of phase-transfer catalytic (PTC) system (solid KOH, toluene, and -40 °C) by virtue of the catalytic action of (S,S)-NAS bromide (5 mol %) furnished the corresponding α-alkyl-α-tert-butoxycarbonyl lactams in very high chemical (<99%) and enantioselectivity (<98% ee). Our catalytic methodology was successfully applied for the enantioselective total synthesis of Nitraria alkaloids. (+)-Isonitramine was obtained in 12 steps (98% ee, 43% yield) from δ-valerolactam through enantioselective phase-transfer catalytic allylation, Dieckmann condensation, and diastereoselective reduction as the key reactions. (-)-Sibirine and (+)-nitramine were prepared from (-)-isonitramine or its intermediate. Switching the phase-transfer catalyst from (S,S)-NAS bromide to (R,R)-NAS bromide afforded (-)-isonitramine (98% ee, 41% yield). (-)-Sibirine was synthesized by N-ethoxycarbonylation of (-)-isonitramine followed by reduction (98% ee, 14 steps, 32% yield). Furthermore, the diastereoselective reduction of (R)-2-benzhydryl-2-azaspiro[5.5]undecane-1,7-dione [(R)-15] followed by reductive removal of the diphenylmethyl group successfully gave (+)-nitramine (98% ee, 11 steps, 40% yield).
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Affiliation(s)
- Jewon Yang
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Yohan Park
- College of Pharmacy, Inje Institute of Pharmaceutical Sciences and Research, Inje University, 197 Inje-ro, Gimhae, Gyeongnam 50834, Republic of Korea
| | - Sehun Yang
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Geumwoo Lee
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Min Woo Ha
- College of Pharmacy, Jeju National University, 102 Jejudaehak-ro Jeju 63243, Republic of Korea
| | - Mi-Hyun Kim
- College of Pharmacy, Gachon University, 191 Hambakmoero, Yeonsu-gu, Incheon 21936, Republic of Korea
| | - Suckchang Hong
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Hyeung-Geun Park
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
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11
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Ju Han H, Sub Byun W, Ho Lee G, Kyung Kim W, Jang K, Yang S, Yang J, Woo Ha M, Hong S, Lee J, Shin J, Bong Oh K, Kook Lee S, Park HG. Synthesis and biological activity of selenopsammaplin A and its analogues as antitumor agents with DOT1L inhibitory activity. Bioorg Med Chem 2021; 35:116072. [PMID: 33636429 DOI: 10.1016/j.bmc.2021.116072] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/03/2021] [Accepted: 02/04/2021] [Indexed: 12/17/2022]
Abstract
Disruptor of telomeric silencing-1 like (DOT1L) is a histone H3 methyltransferase which specifically catalyzes the methylation of histone H3 lysine-79 residue. Recent findings demonstrate that DOT1L is abnormally overexpressed and the upregulated DOT1L evokes the proliferation and metastasis in human breast cancer cells. Therefore, the DOT1L inhibitor is considered a promising strategy to treat breast cancers. Non-nucleoside DOT1L inhibitors, selenopsammaplin A and its analogues, were firstly reported in the present study. Selenopsammaplin A was newly designed and synthesized with 25% overall yield in 8 steps from 3-bromo-4-hydroxybenzaldahyde, and thirteen analogues of selenopsammaplin A were prepared for structure-activity relationship studies of their cytotoxicity against cancer cells and inhibitory activity toward DOT1L for antitumor potential. All synthetic selenopsammaplin A analogues exhibited the higher cytotoxicity compared to psammaplin A with up to 6 - 60 times depending on cancer cells, and most analogues showed significant inhibitory activities against DOT1L. Among the prepared analogues, the phenyl analogue (10) possessed the most potent activity with both cytotoxicity and inhibition of DOT1L. Compound 10 also exhibited the antitumor and antimetastatic activity in an orthotopic mouse metastasis model implanted with MDA-MB-231 human breast cancer cells. These biological findings suggest that analogue 10 is a promising candidate for development as a cancer chemotherapeutic agent in breast cancers.
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Affiliation(s)
- Hae Ju Han
- Research Institute of Pharmaceutical Science and College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea.
| | - Woong Sub Byun
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea.
| | - Gyu Ho Lee
- Research Institute of Pharmaceutical Science and College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Won Kyung Kim
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Kyungkuk Jang
- Research Institute of Pharmaceutical Science and College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Sehun Yang
- Research Institute of Pharmaceutical Science and College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Jewon Yang
- Research Institute of Pharmaceutical Science and College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Min Woo Ha
- College of Pharmacy, Jeju National University, 102 Jejudaehak-ro, Jeju 63243, Republic of Korea; Interdisciplinary Graduate Program in Advanced Convergence Technology & Science, Jeju National University, 102 Jejudaehak-ro, Jeju, 63243, Republic of Korea
| | - Suckchang Hong
- Research Institute of Pharmaceutical Science and College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Jeeyeon Lee
- Research Institute of Pharmaceutical Science and College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Jongheon Shin
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Ki Bong Oh
- Department of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Republic of Korea
| | - Sang Kook Lee
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea.
| | - Hyeung-Geun Park
- Research Institute of Pharmaceutical Science and College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea.
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12
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Lee S, Yang J, Yang S, Lee G, Oh D, Ha MW, Hong S, Park HG. Enantioselective Synthesis of (+)-Coerulescine by a Phase-Transfer Catalytic Allylation of Diphenylmethyl tert-Butyl α-(2-Nitrophenyl)Malonate. Front Chem 2020; 8:577371. [PMID: 33282828 PMCID: PMC7690313 DOI: 10.3389/fchem.2020.577371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 09/14/2020] [Indexed: 12/03/2022] Open
Abstract
A 7-step enantioselective synthetic method for preparing (S)(+)-coerulescine is reported through the use of diphenylmethyl tert-butyl α-(2-nitrophenyl)malonate (16% overall yield, >99% ee). Allylation is the key step under phase-transfer catalytic conditions (86% ee). This synthetic method can be used as a practical route for the synthesis of various derivatives of (S)(+)-coerulescine for analyzing its structure–activity relationships against its biological activities.
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Affiliation(s)
- Sangki Lee
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, South Korea
| | - Jewon Yang
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, South Korea
| | - Sehun Yang
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, South Korea
| | - Geumwoo Lee
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, South Korea
| | - Daehyun Oh
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, South Korea
| | - Min Woo Ha
- College of Pharmacy, Jeju National University, Jeju, South Korea
| | - Suckchang Hong
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, South Korea
| | - Hyeung-Geun Park
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, South Korea
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13
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Sohn S, Ha MW, Park J, Kim YH, Ahn H, Jung S, Kwon SK, Kim YH. High-Efficiency Diphenylpyrimidine Derivatives Blue Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes. Front Chem 2020; 8:356. [PMID: 32478031 PMCID: PMC7240071 DOI: 10.3389/fchem.2020.00356] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 04/07/2020] [Indexed: 11/13/2022] Open
Abstract
Organic light-emitting diodes with thermally activated delayed fluorescence emitter have been developed with highly twisted donor-acceptor configurations and color-pure blue emitters. Synthesized 4-(4-(4,6-diphenylpyrimidin-2-yl)phenyl)-10H-spiro[acridine-9,9'-fluorene] (4,6-PhPMAF) doped device with spiroacridine as a donor unit and diphenylpyrimidine as acceptor exhibits the device characteristics such as the luminescence, external quantum efficiencies, current efficiencies, and power efficiencies corresponding to 213 cd/m2, 2.95%, 3.27 cd/A, and 2.94 lm/W with Commission International de l'Eclairage (CIE) coordinates of (0.15, 0.11) in 4,6-PhPMAF-doped DPEPO emitter. The reported 10-(4-(2,6-diphenylpyrimidin-4-yl)phenyl)-10H-spiro[acridine-9,9'-fluorene] (2,6-PhPMAF) doped device exhibit high device performance with 1,445 cd/m2, 12.38%, 19.6 cd/A, and 15.4 lm/W, which might be originated from increased internal quantum efficiency by up-converted triplet excitons to the singlet state with relatively smaller ΔE ST of 0.17 eV and higher reverse intersystem crossing rate (k RISC) of 1.0 ×108/s in 2,6-PhPMAF than 0.27 eV and 3.9 ×107/s in 4,6-PhPMAF. Despite low performance of 4,6-PhPMAF doped device, synthesized 4,6-PhPMAF has better color purity as a deep-blue emission with y axis (0.11) than reported 2,6-PhPMAF with y axis (0.19) in CIE coordinate. The synthesized 4,6-PhPMAF has higher thermal stability of any transition up to 300°C and decomposition temperature with only 5% weight loss in 400°C than reported 2,6-PhPMAF. The maximum photoluminescence emission of 4,6-PhPMAF in various solvents appeared at 438 nm, which has blue shift about 20 nm than that of 2,6-PhPMAF, which contributes deep-blue emission in synthesized 4,6-PhPMAF.
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Affiliation(s)
- Sunyoung Sohn
- Department of Creative IT Engineering, Pohang University of Science and Technology, Pohang-si, South Korea
| | - Min Woo Ha
- Department of Chemistry and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju-si, South Korea
| | - Jiyong Park
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon, South Korea.,Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea
| | - Yoo-Heon Kim
- Department of Chemistry and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju-si, South Korea
| | - Hyungju Ahn
- Pohang Accelerator Laboratory, Pohang-si, South Korea
| | - Sungjune Jung
- Department of Creative IT Engineering, Pohang University of Science and Technology, Pohang-si, South Korea
| | - Soon-Ki Kwon
- Department of Materials Engineering and Convergence Technology and ERI, Gyeongsang National University, Jinju-si, South Korea
| | - Yun-Hi Kim
- Department of Chemistry and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju-si, South Korea
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14
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Jung JW, Lee JS, Kim J, Im SP, Kim SW, Lazarte JMS, Kim YR, Chun JH, Ha MW, Kim NN, Thompson KD, Kim HJ, Jung TS. Involvement of CD4-1 T cells in the cellular immune response of olive flounder (Paralichthys olivaceus) against viral hemorrhagic septicemia virus (VHSV) and nervous necrosis virus (NNV) infection. Dev Comp Immunol 2020; 103:103518. [PMID: 31605716 DOI: 10.1016/j.dci.2019.103518] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 10/08/2019] [Accepted: 10/08/2019] [Indexed: 06/10/2023]
Abstract
The occurrence of CD4 helper T cells has already been established for a number of teleost species, though, it has not been possible to analyze these responses at a cellular level due to a large lack of appropriate monoclonal antibodies (mAbs). In the present study, we produced a mAb against olive flounder (Paralichthys olivaceus) CD4-1 lymphocyte to investigate the functional activity of the cells to improve our understanding of the T cell response in this species. This mAb is specifically able to detect CD4-1 lymphocytes in olive flounder proved by immunofluorescence staining and RT-PCR analysis. In flow cytometry analysis, the number of CD4-1-positive lymphocytes was observed to gradually increase from 3 days post infection (dpi) and then reach peak at 7 dpi against two viruses challenge. As a conclusion, both the basic properties of CD4-1 T cells and its response to viral infections in olive flounder are very similar to the helper T cells in terrestrial animals.
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Affiliation(s)
- Jae Wook Jung
- Lab. of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501 Jinju, Gyeongnam, 52828, South Korea
| | - Jung Seok Lee
- Lab. of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501 Jinju, Gyeongnam, 52828, South Korea
| | - Jaesung Kim
- Lab. of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501 Jinju, Gyeongnam, 52828, South Korea
| | - Se Pyeong Im
- Lab. of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501 Jinju, Gyeongnam, 52828, South Korea
| | - Si Won Kim
- Lab. of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501 Jinju, Gyeongnam, 52828, South Korea
| | - Jassy Mary S Lazarte
- Lab. of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501 Jinju, Gyeongnam, 52828, South Korea
| | - Young Rim Kim
- Lab. of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501 Jinju, Gyeongnam, 52828, South Korea
| | - Jin Hong Chun
- Lab. of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501 Jinju, Gyeongnam, 52828, South Korea
| | - Min Woo Ha
- College of Pharmacy, Gyeongsang National University, 501, Jinju-daero, Jinju, Gyeongnam, 52828, South Korea
| | - Na Na Kim
- Inland Aquaculture Research Center, NIFS, Changwon, 645-806, South Korea
| | - Kim D Thompson
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Penicuik, Midlothian, EH26 0PZ, UK
| | - Hyoung Jun Kim
- Lab. of Aquatic Animal Quarantine, General Service Division, National Fishery Products Quality Management Service, Busan 49111, South Korea.
| | - Tae Sung Jung
- Lab. of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, 501 Jinju, Gyeongnam, 52828, South Korea; Centre for Marine Bioproducts Development, Flinders University, Bedford Park, Adelaide, SA, 5042, Australia.
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15
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Jung JW, Lee JS, Kim J, Im SP, Kim SW, Lazarte JMS, Kim YR, Chun JH, Ha MW, Kim HS, Thompson KD, Jung TS. Characterization of Hagfish ( Eptatretus burgeri) Variable Lymphocyte Receptor-Based Antibody and Its Potential Role in the Neutralization of Nervous Necrosis Virus. J Immunol 2019; 204:718-725. [PMID: 31836656 DOI: 10.4049/jimmunol.1900675] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 11/18/2019] [Indexed: 12/13/2022]
Abstract
The variable lymphocyte receptor (VLR) mediates the humoral immune response in jawless vertebrates, including lamprey (Petromyzon marinus) and hagfish (Eptatretus burgeri). Hagfish VLRBs are composed of leucine-rich repeat (LRR) modules, conjugated with a superhydrophobic C-terminal tail, which contributes to low levels of expression in recombinant protein technology. In this study, we screened Ag-specific VLRBs from hagfish immunized with nervous necrosis virus (NNV). The artificially multimerized form of VLRB was constructed using a mammalian expression system. To enhance the level of expression of the Ag-specific VLRB, mutagenesis of the VLRB was achieved in vitro through domain swapping of the LRR C-terminal cap and variable LRR module. The mutant VLRB obtained, with high expression and secretion levels, was able to specifically recognize purified and progeny NNV, and the Ag binding ability of this mutant was increased by at least 250-fold to that of the nonmutant VLRB. Furthermore, preincubation of the Ag-specific VLRB with NNV reduced the infectivity of NNV in E11 cells in vitro, and in vivo experiment. Our results suggest that the newly developed Ag-specific VLRB has the potential to be used as diagnostic and therapeutic reagents for NNV infections in fish.
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Affiliation(s)
- Jae Wook Jung
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, Jinju, Gyeongnam 52828, South Korea
| | - Jung Seok Lee
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, Jinju, Gyeongnam 52828, South Korea
| | - Jaesung Kim
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, Jinju, Gyeongnam 52828, South Korea
| | - Se Pyeong Im
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, Jinju, Gyeongnam 52828, South Korea
| | - Si Won Kim
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, Jinju, Gyeongnam 52828, South Korea
| | - Jassy Mary S Lazarte
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, Jinju, Gyeongnam 52828, South Korea
| | - Young Rim Kim
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, Jinju, Gyeongnam 52828, South Korea
| | - Jin Hong Chun
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, Jinju, Gyeongnam 52828, South Korea
| | - Min Woo Ha
- College of Pharmacy, Gyeongsang National University, Jinju-daero, Jinju, Gyeongnam 52828, South Korea
| | - Hyeong Su Kim
- Inland Aquaculture Research Center, National Institute of Fisheries Science, Changwon 645-806, South Korea
| | - Kim D Thompson
- Moredun Research Institute, Pentlands Science Park, Penicuik, Midlothian EH26 0PZ, United Kingdom; and
| | - Tae Sung Jung
- Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, College of Veterinary Medicine, Gyeongsang National University, Jinju, Gyeongnam 52828, South Korea; .,Centre for Marine Bioproducts Development, College of Medicine and Public Health, Flinders University, Bedford Park, Adelaide, South Australia 5042, Australia
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16
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Jung SH, Kim B, Park C, Kim J, Ha MW, Hong S, Park H. Enantioselective Synthesis of Chiral α‐Alkylthiomalonates via a Phase‐Transfer‐Catalyzed α‐Sulfenylation of α‐Alkylmalonates. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900346] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- So Hyun Jung
- Research Institute of Pharmaceutical Sciences and College of PharmacySeoul National University Seoul 151-742 Korea
| | - Byungsoo Kim
- Research Institute of Pharmaceutical Sciences and College of PharmacySeoul National University Seoul 151-742 Korea
| | - Cheonhyoung Park
- Research Institute of Pharmaceutical Sciences and College of PharmacySeoul National University Seoul 151-742 Korea
| | - Jeongseok Kim
- Research Institute of Pharmaceutical Sciences and College of PharmacySeoul National University Seoul 151-742 Korea
| | - Min Woo Ha
- Research Institute of Pharmaceutical Sciences and College of PharmacySeoul National University Seoul 151-742 Korea
| | - Suckchang Hong
- Research Institute of Pharmaceutical Sciences and College of PharmacySeoul National University Seoul 151-742 Korea
| | - Hyeung‐geun Park
- Research Institute of Pharmaceutical Sciences and College of PharmacySeoul National University Seoul 151-742 Korea
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17
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Ha MW, Lee JY, Kim D, Lee G, Lee JK, Hong S, Park HG. Enantioselective Synthesis of Chiral α-Thio-Quaternary Stereogenic Centers via Phase-Transfer-Catalyzed α-Alkylation of α-Acylthiomalonates. J Org Chem 2018; 83:1011-1018. [PMID: 29262254 DOI: 10.1021/acs.joc.7b02605] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient synthetic method for establishing chiral α-thio-α-quaternary stereogenic center was successfully developed. The enantioselective α-alkylation of α-acylthiomalonates under phase-transfer catalytic conditions [50% aq. KOH, toluene, -20 °C, and (S,S)-3,4,5-trifluorophenyl-NAS bromide] provided the corresponding α-acylthio-α-alkylmalonates in high chemical yields (up to 99%) and high optical yields (up to 98% ee).
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Affiliation(s)
- Min Woo Ha
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University , Seoul 151-742, Korea
| | - Jun Young Lee
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University , Seoul 151-742, Korea
| | - Doyoung Kim
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University , Seoul 151-742, Korea
| | - Geumwoo Lee
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University , Seoul 151-742, Korea
| | - Jae Kyun Lee
- Neuro-Medicine Center, Korea Institute of Science and Technology , PO Box 131, Cheongyang, Seoul 130-650, Republic of Korea
| | - Suckchang Hong
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University , Seoul 151-742, Korea
| | - Hyeung-Geun Park
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University , Seoul 151-742, Korea
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18
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Kim D, Ha MW, Hong S, Park C, Kim B, Yang J, Park HG. Enantioselective Synthesis of Chiral α-Azido and α-Aryloxy Quaternary Stereogenic Centers via the Phase-Transfer-Catalyzed α-Alkylation of α-Bromomalonates, Followed by SN2 Substitution. J Org Chem 2017; 82:4936-4943. [DOI: 10.1021/acs.joc.7b00324] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Doyoung Kim
- Research
Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Min Woo Ha
- Research
Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Suckchang Hong
- Korea Research Institute of Chemical Technology, 16 Gajung-ro Yoosung-gu, Daejeon 34114, Korea
| | - Cheonhyoung Park
- Research
Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Byungsoo Kim
- Research
Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Jewon Yang
- Research
Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Hyeung-geun Park
- Research
Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 151-742, Korea
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19
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Ha MW, Choi S, Kim S, Lee JY, Lee JK, Lee J, Hong S, Park HG. Phase-transfer catalyzed enantioselective α-alkylation of α-acyloxymalonates: construction of chiral α-hydroxy quaternary stereogenic centers. RSC Adv 2016. [DOI: 10.1039/c6ra15121c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The enantioselective synthesis of α-acyloxy-α-alkylmalonates was developed as an efficient method for producing chiral α-tertiary alcohols, which are potentially valuable intermediates in the synthesis of natural products and pharmaceuticals.
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Affiliation(s)
- Min Woo Ha
- Research Institute of Pharmaceutical Sciences and College of Pharmacy
- Seoul National University
- Seoul 151-742
- Korea
| | - Sujee Choi
- Research Institute of Pharmaceutical Sciences and College of Pharmacy
- Seoul National University
- Seoul 151-742
- Korea
| | - Seek Kim
- Research Institute of Pharmaceutical Sciences and College of Pharmacy
- Seoul National University
- Seoul 151-742
- Korea
| | - Jun Young Lee
- Research Institute of Pharmaceutical Sciences and College of Pharmacy
- Seoul National University
- Seoul 151-742
- Korea
| | - Jae Kyun Lee
- Neuro-Medicine Center
- Korea Institute of Science and Technology
- Seoul 130-650
- Republic of Korea
| | - Jeeyeon Lee
- Research Institute of Pharmaceutical Sciences and College of Pharmacy
- Seoul National University
- Seoul 151-742
- Korea
| | - Suckchang Hong
- Research Institute of Pharmaceutical Sciences and College of Pharmacy
- Seoul National University
- Seoul 151-742
- Korea
| | - Hyeung-geun Park
- Research Institute of Pharmaceutical Sciences and College of Pharmacy
- Seoul National University
- Seoul 151-742
- Korea
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20
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Sahu PK, Kim G, Nayak A, Ahn JY, Ha MW, Park C, Yu J, Park HG, Jeong LS. Cover Picture: Synthesis of Acyclic Selenonucleoside Phosphonates as Potential Antiviral Agents (Asian J. Org. Chem. 2/2016). ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Pramod K. Sahu
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
| | - Gyudong Kim
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
| | - Akshata Nayak
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
- College of Pharmacy; Ewha Womans University; Seoul 120-750 Korea
| | - Ji Yoon Ahn
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
| | - Min Woo Ha
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
| | - Cheonhyoung Park
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
| | - Jinha Yu
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
| | - Hyeung-geun Park
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
| | - Lak Shin Jeong
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
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21
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Sahu PK, Kim G, Nayak A, Ahn JY, Ha MW, Park C, Yu J, Park HG, Jeong LS. Synthesis of Acyclic Selenonucleoside Phosphonates as Potential Antiviral Agents. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500421] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Pramod K. Sahu
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
| | - Gyudong Kim
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
| | - Akshata Nayak
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
- College of Pharmacy; Ewha Womans University; Seoul 120-750 Korea
| | - Ji Yoon Ahn
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
| | - Min Woo Ha
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
| | - Cheonhyoung Park
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
| | - Jinha Yu
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
| | - Hyeung-geun Park
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
| | - Lak Shin Jeong
- Research Institute of Pharmaceutical Sciences; College of Pharmacy; Seoul National University; Seoul 151-742 Korea
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Park C, Ha MW, Kim B, Hong S, Kim D, Park Y, Kim MH, Lee JK, Lee J, Park HG. Inside Cover: Enantioselective α-Alkylation of Benzylideneamino tert-Butyl Malonates by Phase-Transfer Catalysis (Adv. Synth. Catal. 13/2015). Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Park C, Ha MW, Kim B, Hong S, Kim D, Park Y, Kim MH, Lee JK, Lee J, Park HG. Enantioselective α-Alkylation of Benzylideneaminotert-Butyl Malonates by Phase-Transfer Catalysis. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500560] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Lee JY, Lee MY, Ha MW, Won TH, Cho HJ, Shin J, Park HG, Kim DD. Determination and validation of psammaplin A and its derivatives in rat plasma by liquid chromatography-tandem mass spectrometry and its application in pharmacokinetic study. J Chromatogr B Analyt Technol Biomed Life Sci 2015; 1000:155-62. [PMID: 26232561 DOI: 10.1016/j.jchromb.2015.07.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2015] [Revised: 07/01/2015] [Accepted: 07/05/2015] [Indexed: 10/23/2022]
Abstract
A liquid chromatography-tandem mass (LC-MS/MS) method was developed for the determination of psammaplin A (PsA) and its newly synthesized derivatives (PsA 107, PsA 109, and PsA 123) in rat plasma using bupropion as an internal standard (IS). The plasma samples were deproteinized with acetonitrile. Chromatographic separation was performed on hydro-RP column (75×2.0mm, 80Å, 4μm) with isocratic elution using 5mM ammonium formate buffer/acetonitrile (30:70, v/v) at a flow rate of 0.4mL/min and the total run time was 5min. Mass spectrometric detection was performed with positive electrospray ionization (ESI) in multiple reaction monitoring (MRM) mode. The ion transitions monitored were m/z 663.2→331.0, 687.2→343.1, 587.3→293.1, 563.3→281.0, and 240.0→184.0 for PsA, PsA 107, PsA 109, PsA 123, and IS, respectively. All analytes showed good linearity over the concentration range of 5.00-5000ng/mL (r(2)≥0.994). The lower limit of quantification was 5ng/mL for PsA and its three PsA derivatives. Within- and between-run precisions (relative standard deviation, RSD) were less than 9.66% and accuracy (relative error, RE) ranged from -9.34% to 7.25%. Established method was successfully applied to the investigation of pharmacokinetic properties of PsA and its derivatives in rats after intravenous administration at a dose of 2mg/kg.
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Affiliation(s)
- Jae-Young Lee
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul 151-742, Republic of Korea
| | - Mee Yeon Lee
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul 151-742, Republic of Korea
| | - Min Woo Ha
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul 151-742, Republic of Korea
| | - Tae Hyung Won
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul 151-742, Republic of Korea
| | - Hyun-Jong Cho
- College of Pharmacy, Kangwon National University, Chuncheon 200-701, Republic of Korea
| | - Jongheon Shin
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul 151-742, Republic of Korea
| | - Hyeung-geun Park
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul 151-742, Republic of Korea
| | - Dae-Duk Kim
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul 151-742, Republic of Korea.
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Hong S, Shin Y, Jung M, Ha MW, Park Y, Lee YJ, Shin J, Oh KB, Lee SK, Park HG. Efficient synthesis and biological activity of Psammaplin A and its analogues as antitumor agents. Eur J Med Chem 2015; 96:218-30. [PMID: 25884112 DOI: 10.1016/j.ejmech.2015.04.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 04/01/2015] [Accepted: 04/01/2015] [Indexed: 11/15/2022]
Abstract
We describe a new concise method for the synthesis of psammaplin A and its analogues, and antitumor activity of psammaplin A analogues. Psammaplin A was obtained with 41% yield in 5 steps from 3-bromo-4-hydroxybenzaldahyde and ethyl acetoacetate via Knoevenagel condensation and α-nitrosation as key steps. Twenty eight analogues of psammaplin A were prepared employing the new synthetic approach. Structure-activity relationship study against cytotoxicity reveal that the free oxime group and disulfide functional group were responsible for high cytotoxicity. Also the bromotyrosine component was relatively tolerable and hydrophobic aromatic groups preserved the cytotoxicity. The cytotoxicity of aromatic group is dependent on the size and spatial geometry. Among them, five compounds showed comparable cytotoxicity to psammaplin A. Compound 30 exhibited potential HDAC inhibitory activity and in vivo antitumor activity.
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Affiliation(s)
- Suckchang Hong
- Research Institute of Pharmaceutical Science and College of Pharmacy, Seoul National University, Seoul 151-742, South Korea
| | - Yoonho Shin
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, South Korea
| | - Myunggi Jung
- Research Institute of Pharmaceutical Science and College of Pharmacy, Seoul National University, Seoul 151-742, South Korea
| | - Min Woo Ha
- Research Institute of Pharmaceutical Science and College of Pharmacy, Seoul National University, Seoul 151-742, South Korea
| | - Yohan Park
- College of Pharmacy, Inje University, 607 Obang-dong, Gimhae, Gyeongnam 621-749, South Korea
| | - Yeon-Ju Lee
- Korea Institute of Ocean Science and Technology, Global Bioresources Research Center, Ansan 426-744, South Korea
| | - Jongheon Shin
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, South Korea
| | - Ki Bong Oh
- Department of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University, Seoul 151-921, South Korea
| | - Sang Kook Lee
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, South Korea.
| | - Hyeung-geun Park
- Research Institute of Pharmaceutical Science and College of Pharmacy, Seoul National University, Seoul 151-742, South Korea.
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Ha MW, Lee M, Choi S, Kim S, Hong S, Park Y, Kim MH, Kim TS, Lee J, Lee JK, Park HG. Construction of Chiral α-Amino Quaternary Stereogenic Centers via Phase-Transfer Catalyzed Enantioselective α-Alkylation of α-Amidomalonates. J Org Chem 2015; 80:3270-9. [DOI: 10.1021/jo502791d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Min Woo Ha
- Research
Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Myungmo Lee
- Research
Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Sujee Choi
- Research
Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Seek Kim
- Research
Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Suckchang Hong
- Research
Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Yohan Park
- College
of Pharmacy, Inje University, 607 Obang-dong, Gimhae, Gyeongnam 621-749, Korea
| | - Mi-hyun Kim
- College
of Pharmacy, Gachon University, 191 Hambakmoero, Yeonsu-gu, Incheon 406-799, Korea
| | - Taek-Soo Kim
- College
of Pharmacy, Gachon University, 191 Hambakmoero, Yeonsu-gu, Incheon 406-799, Korea
| | - Jihoon Lee
- Research
Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Jae Kyun Lee
- Neuro-Medicine
Center, Korea Institute of Science and Technology, PO Box 131, Cheongyang, Seoul 130-650, Republic of Korea
| | - Hyeung-geun Park
- Research
Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 151-742, Korea
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Hong S, Kim M, Jung M, Ha MW, Lee M, Park Y, Kim MH, Kim TS, Lee J, Park HG. Enantioselective synthesis of α-halo-α-alkylmalonates via phase-transfer catalytic α-alkylation. Org Biomol Chem 2014; 12:1510-7. [DOI: 10.1039/c3ob42107d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
A new efficient and concise enantioselective synthetic method for (-)-horsfiline is reported. (-)-Horsfiline could be obtained from diphenylmethyl tert-butyl malonate in 9 steps (32%,>99% ee) by using the enantioselective phase-transfer catalytic allylation (91% ee) as the key step. This approach can be applied as a practical route for the large-scale synthesis of spirooxindole natural products, which enables a systematic investigation of their biological activity to be performed.
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Affiliation(s)
- Suckchang Hong
- Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 151-742, Korea
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Ha MW, Lee H, Yi HY, Park Y, Kim S, Hong S, Lee M, Kim MH, Kim TS, Park HG. Enantioselective Phase-Transfer Catalytic α-Benzylation and α-Allylation of α-tert-Butoxycarbonyllactones. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201200976] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Ha MW, Hong S, Park C, Park Y, Lee J, Kim MH, Lee J, Park HG. Enantioselective phase-transfer catalytic α-alkylation of 2-methylbenzyl tert-butyl malonates. Org Biomol Chem 2013; 11:4030-9. [DOI: 10.1039/c3ob40481a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lee M, Lee YJ, Park E, Park Y, Ha MW, Hong S, Lee YJ, Kim TS, Kim MH, Park HG. Highly enantioselective synthesis of 5-phenyl-2-alkylprolines using phase-transfer catalytic alkylation. Org Biomol Chem 2013; 11:2039-46. [DOI: 10.1039/c3ob27089k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yoo MS, Kim DG, Ha MW, Jew SS, Park HG, Jeong BS. Synthesis of (αR,βS)-epoxyketones by asymmetric epoxidation of chalcones with cinchona phase-transfer catalysts. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.08.056] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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