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Kim JY, Jeon K, Hong JJ, Park SI, Cho H, Park HJ, Kwak HW, Park HJ, Bang YJ, Lee YS, Bae SH, Kim SH, Hwang KA, Jung DI, Cho SH, Seo SH, Kim G, Oh H, Lee HY, Kim KH, Lim HY, Jeon P, Lee JY, Chung J, Lee SM, Ko HL, Song M, Cho NH, Lee YS, Hong SH, Nam JH. Heterologous vaccination utilizing viral vector and protein platforms confers complete protection against SFTSV. Sci Rep 2023; 13:8189. [PMID: 37210393 DOI: 10.1038/s41598-023-35328-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Accepted: 05/16/2023] [Indexed: 05/22/2023] Open
Abstract
Severe fever with thrombocytopenia syndrome virus was first discovered in 2009 as the causative agent of severe fever with thrombocytopenia syndrome. Despite its potential threat to public health, no prophylactic vaccine is yet available. This study developed a heterologous prime-boost strategy comprising priming with recombinant replication-deficient human adenovirus type 5 (rAd5) expressing the surface glycoprotein, Gn, and boosting with Gn protein. This vaccination regimen induced balanced Th1/Th2 immune responses and resulted in potent humoral and T cell-mediated responses in mice. It elicited high neutralizing antibody titers in both mice and non-human primates. Transcriptome analysis revealed that rAd5 and Gn proteins induced adaptive and innate immune pathways, respectively. This study provides immunological and mechanistic insight into this heterologous regimen and paves the way for future strategies against emerging infectious diseases.
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Affiliation(s)
- Jae-Yong Kim
- Department of Medical and Biological Sciences, The Catholic University of Korea, 43-1 Yeokgok-dong, Wonmi-gu, Bucheon, 14662, Republic of Korea
- BK Plus Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, Republic of Korea
- SML Biopharm, Gwangmyeong, Gyeonggi-do, Republic of Korea
| | - Kyeongseok Jeon
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Jung Joo Hong
- Immunology and Infectious Disease Lab, National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB)/University of Science and Technology, 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28116, Republic of Korea
| | - Sang-In Park
- SML Biopharm, Gwangmyeong, Gyeonggi-do, Republic of Korea
| | - Hyeonggon Cho
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Hyo-Jung Park
- Department of Medical and Biological Sciences, The Catholic University of Korea, 43-1 Yeokgok-dong, Wonmi-gu, Bucheon, 14662, Republic of Korea
- BK Plus Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, Republic of Korea
| | - Hye Won Kwak
- SML Biopharm, Gwangmyeong, Gyeonggi-do, Republic of Korea
| | - Hyeong-Jun Park
- Department of Medical and Biological Sciences, The Catholic University of Korea, 43-1 Yeokgok-dong, Wonmi-gu, Bucheon, 14662, Republic of Korea
- BK Plus Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, Republic of Korea
- SML Biopharm, Gwangmyeong, Gyeonggi-do, Republic of Korea
| | - Yoo-Jin Bang
- Department of Medical and Biological Sciences, The Catholic University of Korea, 43-1 Yeokgok-dong, Wonmi-gu, Bucheon, 14662, Republic of Korea
- BK Plus Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, Republic of Korea
- SML Biopharm, Gwangmyeong, Gyeonggi-do, Republic of Korea
| | - Yu-Sun Lee
- Department of Medical and Biological Sciences, The Catholic University of Korea, 43-1 Yeokgok-dong, Wonmi-gu, Bucheon, 14662, Republic of Korea
- BK Plus Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, Republic of Korea
| | - Seo-Hyeon Bae
- Department of Medical and Biological Sciences, The Catholic University of Korea, 43-1 Yeokgok-dong, Wonmi-gu, Bucheon, 14662, Republic of Korea
- BK Plus Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, Republic of Korea
| | - So-Hee Kim
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Kyung-Ah Hwang
- Department of Research and Development, Genetree Research, Seoul, Republic of Korea
| | - Dae-Im Jung
- Science Unit, International Vaccine Institute, Seoul, Republic of Korea
| | - Seong Hoo Cho
- Science Unit, International Vaccine Institute, Seoul, Republic of Korea
| | - Sang Hwan Seo
- Science Unit, International Vaccine Institute, Seoul, Republic of Korea
| | - Green Kim
- Immunology and Infectious Disease Lab, National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB)/University of Science and Technology, 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28116, Republic of Korea
| | - Hanseul Oh
- Immunology and Infectious Disease Lab, National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB)/University of Science and Technology, 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28116, Republic of Korea
| | - Hwal-Yong Lee
- Immunology and Infectious Disease Lab, National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB)/University of Science and Technology, 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28116, Republic of Korea
| | - Ki Hyun Kim
- Department of Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Hee-Young Lim
- Center for Emerging Virus Research, National Institutes of Health, Korea Disease Control and Prevention Agency, Cheongju, Republic of Korea
| | - Pyeonghwa Jeon
- Center for Emerging Virus Research, National Institutes of Health, Korea Disease Control and Prevention Agency, Cheongju, Republic of Korea
| | - Joo-Yeon Lee
- Center for Emerging Virus Research, National Institutes of Health, Korea Disease Control and Prevention Agency, Cheongju, Republic of Korea
| | - Junho Chung
- Department of Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Sang-Myeong Lee
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
| | - Hae Li Ko
- Scripps Korea Antibody Institute, Chuncheon, 24341, Republic of Korea
| | - Manki Song
- Science Unit, International Vaccine Institute, Seoul, Republic of Korea
| | - Nam-Hyuk Cho
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea.
| | - Young-Suk Lee
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea.
| | - So-Hee Hong
- Department of Microbiology, College of Medicine, Ewha Womans University, Seoul, 07804, Republic of Korea.
| | - Jae-Hwan Nam
- Department of Medical and Biological Sciences, The Catholic University of Korea, 43-1 Yeokgok-dong, Wonmi-gu, Bucheon, 14662, Republic of Korea.
- BK Plus Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, Republic of Korea.
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Choi JA, Wu K, Kim GN, Saeedian N, Seon SH, Park G, Jung DI, Jeong HW, Kim NH, Seo SH, Lee S, Song M, Kang CY. Induction of protective immune responses against a lethal Zika virus challenge post-vaccination with a dual serotype of recombinant vesicular stomatitis virus carrying the genetically modified Zika virus E protein gene. J Gen Virol 2021; 102. [PMID: 33913804 DOI: 10.1099/jgv.0.001588] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The development of a vaccine to prevent Zika virus (ZIKV) infection has been one of the priorities in infectious disease research in recent years. There have been numerous attempts to develop an effective vaccine against ZIKV. It is imperative to choose the safest and the most effective ZIKV vaccine from all candidate vaccines to control this infection globally. We have employed a dual serotype of prime-boost recombinant vesicular stomatitis virus (VSV) vaccine strategy, to develop a ZIKV vaccine candidate, using a type 1 IFN-receptor knock-out (Ifnar -/-) mouse model for challenge studies. Prime vaccination with an attenuated recombinant VSV Indiana serotype (rVSVInd) carrying a genetically modified ZIKV envelope (E) protein gene followed by boost vaccination with attenuated recombinant VSV New Jersey serotype (rVSVNJ) carrying the same E gene induced robust adaptive immune responses. In particular, rVSV carrying the ZIKV E gene with the honeybee melittin signal peptide (msp) at the N terminus and VSV G protein transmembrane domain and cytoplasmic tail (Gtc) at the C terminus of the E gene induced strong protective immune responses. This vaccine regimen induced highly potent neutralizing antibodies and T cell responses in the absence of an adjuvant and protected Ifnar -/- mice from a lethal dose of the ZIKV challenge.
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Affiliation(s)
- Jung Ah Choi
- International Vaccine Institute, SNU Research Park, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Kunyu Wu
- Department of Microbiology and Immunology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario N6G 2V4, Canada
| | - Gyoung Nyoun Kim
- Department of Microbiology and Immunology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario N6G 2V4, Canada
| | - Nasrin Saeedian
- Department of Microbiology and Immunology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario N6G 2V4, Canada
| | - Seung Han Seon
- International Vaccine Institute, SNU Research Park, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Gayoung Park
- International Vaccine Institute, SNU Research Park, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Dae-Im Jung
- International Vaccine Institute, SNU Research Park, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Hoe Won Jeong
- International Vaccine Institute, SNU Research Park, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Na Hyung Kim
- Sumagen, 4F Dongwon Bldg, Teheran-ro 77-gil, Gangnam-gu, Seoul 06159, Republic of Korea
| | - Sang Hwan Seo
- International Vaccine Institute, SNU Research Park, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Sangkyun Lee
- Sumagen, 4F Dongwon Bldg, Teheran-ro 77-gil, Gangnam-gu, Seoul 06159, Republic of Korea
| | - Manki Song
- International Vaccine Institute, SNU Research Park, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - C Yong Kang
- Department of Microbiology and Immunology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario N6G 2V4, Canada
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Goo J, Jeong Y, Park YS, Yang E, Jung DI, Rho S, Park U, Sung H, Park PG, Choi JA, Seo SH, Cho NH, Lee H, Lee JM, Kim JO, Song M. Characterization of novel monoclonal antibodies against MERS-coronavirus spike protein. Virus Res 2020; 278:197863. [PMID: 31945421 PMCID: PMC7114870 DOI: 10.1016/j.virusres.2020.197863] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [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: 10/18/2019] [Revised: 01/02/2020] [Accepted: 01/10/2020] [Indexed: 12/14/2022]
Abstract
Identification of neutralizing mAbs using MERS-CoV spike-pseudotyped virus. Transmembrane domain-deleted spike subunit protein induced neutralizing antibodies. Neutralizing antibodies could bind to RBD of MERS-CoV spike, but not vice versa. Mutation in residue 506–509 or 529 of S elicits neutralization escape of MERS-CoV. Our mAbs can be utilized for identification of specific mutation of MERS-CoV.
Middle East Respiratory Syndrome coronavirus (MERS-CoV) causes severe pulmonary infection, with ∼35 % mortality. Spike glycoprotein (S) of MERS-CoV is a key target for vaccines and therapeutics because S mediates viral entry and membrane-fusion to host cells. Here, four different S subunit proteins, receptor-binding domain (RBD; 358–606 aa), S1 (1–751 aa), S2 (752–1296 aa), and SΔTM (1–1296 aa), were generated using the baculoviral system and immunized in mice to develop neutralizing antibodies. We developed 77 hybridomas and selected five neutralizing mAbs by immunization with SΔTM against MERS-CoV EMC/2012 strain S-pseudotyped lentivirus. However, all five monoclonal antibodies (mAb) did not neutralize the pseudotyped V534A mutation. Additionally, one mAb RBD-14F8 did not show neutralizing activity against pseudoviruses with amino acid substitution of L506 F or D509 G (England1 strain, EMC/2012 L506 F, and EMC/2012 D509 G), and RBD-43E4 mAb could not neutralize the pseudotyped I529 T mutation, while three other neutralizing mAbs showed broad neutralizing activity. This implies that the mutation in residue 506–509, 529, and 534 of S is critical to generate neutralization escape variants of MERS-CoV. Interestingly, all five neutralizing mAbs have binding affinity to RBD, although most mAbs generated by RBD did not have neutralizing activity. Additionally, chimeric antibodies of RBD-14F8 and RBD-43E4 with human Fc and light chain showed neutralizing effect against wild type MERS-CoV KOR/KNIH/002, similar to the original mouse mAbs. Thus, our mAbs can be utilized for the identification of specific mutations of MERS-CoV.
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Affiliation(s)
- Junghyun Goo
- Science Unit, International Vaccine Institute, Seoul, South Korea
| | - Yuji Jeong
- Science Unit, International Vaccine Institute, Seoul, South Korea
| | - Young-Shin Park
- Science Unit, International Vaccine Institute, Seoul, South Korea
| | - Eunji Yang
- Science Unit, International Vaccine Institute, Seoul, South Korea
| | - Dae-Im Jung
- Science Unit, International Vaccine Institute, Seoul, South Korea
| | - Semi Rho
- Science Unit, International Vaccine Institute, Seoul, South Korea
| | - Uni Park
- Department of Microbiology and Immunology, South Korea; Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, South Korea
| | | | - Pil-Gu Park
- Department of Microbiology and Immunology, Brain Korea 21 PLUS Project for Medical Science, Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul, South Korea
| | - Jung-Ah Choi
- Science Unit, International Vaccine Institute, Seoul, South Korea
| | - Sang Hwan Seo
- Science Unit, International Vaccine Institute, Seoul, South Korea
| | - Nam Hyuck Cho
- Department of Microbiology and Immunology, South Korea; Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, South Korea; Institute of Endemic Disease, Seoul National University Medical Research Center and Bundang Hospital, Seoul, South Korea
| | - Hyeja Lee
- NKMAX Co., Ltd., Seongnam, South Korea
| | - Jae Myun Lee
- Department of Microbiology and Immunology, Brain Korea 21 PLUS Project for Medical Science, Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul, South Korea
| | - Jae-Ouk Kim
- Science Unit, International Vaccine Institute, Seoul, South Korea.
| | - Manki Song
- Science Unit, International Vaccine Institute, Seoul, South Korea.
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Cheon IS, Kim JY, Choi Y, Shim BS, Choi JA, Jung DI, Kim JO, Braciale TJ, Youn H, Song MK, Chang J. Sublingual Immunization With an RSV G Glycoprotein Fragment Primes IL-17-Mediated Immunopathology Upon Respiratory Syncytial Virus Infection. Front Immunol 2019; 10:567. [PMID: 30984173 PMCID: PMC6447673 DOI: 10.3389/fimmu.2019.00567] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 09/17/2018] [Accepted: 03/04/2019] [Indexed: 11/22/2022] Open
Abstract
Respiratory syncytial virus (RSV) is the leading cause of serious respiratory tract disease but there is no licensed RSV vaccine. Immunopathological mechanisms have long been suspected as operating in the development of severe RSV disease and have hampered the development of safe and effective vaccines. Here, we show that unlike intranasal immunization, sublingual immunization with RSV glycoprotein fragment containing the central conserved region (Gcf) primes the host for severe disease upon RSV challenge. This increased pathology does not require replication by the challenge virus and is associated with massive infiltration of inflammatory cells, extensive cell death, and excessive mucus production in the airway and lungs. This exacerbated RSV disease primed by sublingual Gcf immunization is distinct from the immunopathology by G-expressing vaccinia virus or formalin-inactivated RSV, and preceded by prominent IL-17 production. IL-17 deficiency abolished the enhanced disease. Our results suggest a novel mechanism of RSV vaccine-induced immunopathology by IL-17, and highlights the importance of vaccination site.
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Affiliation(s)
- In Su Cheon
- Laboratory Science Division, International Vaccine Institute, Seoul, South Korea
| | - Joo Young Kim
- Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul, South Korea
| | - Youngjoo Choi
- Laboratory Science Division, International Vaccine Institute, Seoul, South Korea
| | - Byoung-Shik Shim
- Laboratory Science Division, International Vaccine Institute, Seoul, South Korea
| | - Jung-Ah Choi
- Laboratory Science Division, International Vaccine Institute, Seoul, South Korea
| | - Dae-Im Jung
- Laboratory Science Division, International Vaccine Institute, Seoul, South Korea
| | - Jae-Ouk Kim
- Laboratory Science Division, International Vaccine Institute, Seoul, South Korea
| | - Thomas J Braciale
- The Beirne B. Carter Center for Immunology Research and Department of Pathology, The University of Virginia, Charlottesville, VA, United States
| | - Hyewon Youn
- Department of Nuclear Medicine, Cancer Research Institute, Seoul National University College of Medicine, Seoul, South Korea.,Cancer Imaging Center, Seoul National University Hospital, Seoul, South Korea
| | - Man Ki Song
- Laboratory Science Division, International Vaccine Institute, Seoul, South Korea
| | - Jun Chang
- Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul, South Korea
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Kim SH, Jung DI, Yang IY, Jang SH, Kim J, Truong TT, Pham TV, Truong NU, Lee KY, Jang YS. Application of an M-cell-targeting ligand for oral vaccination induces efficient systemic and mucosal immune responses against a viral antigen. Int Immunol 2013; 25:623-32. [DOI: 10.1093/intimm/dxt029] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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Kim SH, Jung DI, Yang IY, Jang SH, Kim J, Truong TT, Van Pham T, Truong NU, Lee KY, Jang YS. WITHDRAWN: Application of M cell targeting ligand for oral vaccination to induce efficient systemic and mucosal immune responses against viral antigens. Immunobiology 2013. [DOI: 10.1016/j.imbio.2013.04.016] [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: 10/26/2022]
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Kim SH, Jung DI, Yang IY, Kim J, Lee KY, Nochi T, Kiyono H, Jang YS. M cells expressing the complement C5a receptor are efficient targets for mucosal vaccine delivery. Eur J Immunol 2011; 41:3219-29. [PMID: 21887786 DOI: 10.1002/eji.201141592] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2011] [Revised: 07/21/2011] [Accepted: 08/26/2011] [Indexed: 11/10/2022]
Abstract
In the mucosal immune system, M cells are known as specialized epithelial cells that take up luminal antigens, although the receptors on M cells and the mechanism of antigen uptake into M cells are not well-understood. Here, we report the expression of the complement C5a receptor (C5aR) on the apical surface of M cells. C5ar mRNA expression in co-cultured Caco-2 human M-like cells was six-fold higher than in mono-cultured cells. C5aR expression was detected together with glycoprotein 2, an M-cell-specific protein, on the apical surface of M-like cells and mouse Peyer's patch M cells. Interestingly, after oral administration of Yersinia enterocolitica which expresses outer membrane protein H (OmpH) that is homologous to the Skp α1 domain of Escherichia coli, a ligand of C5aR, dense clustering and phosphorylation of C5aR were detected in M cells. Finally, targeted antigen delivery to M cells using C5aR as a receptor was achieved using the OmpH α1 of Y. enterocolitica such that the induction of ligand-conjugated antigen-specific immune responses was confirmed in mice after oral immunization of the OmpH β1α1-conjugated antigen. Collectively, we identified C5aR expression on M cells and suggest that C5aR could be used as a target receptor for mucosal antigen delivery.
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Affiliation(s)
- Sae-Hae Kim
- Department of Molecular Biology and Institute for Molecular Biology and Genetics, Chonbuk National University, Jeonju, Korea
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Pyun HJ, Wagschal KC, Jung DI, Coates RM, Croteau R. Stereochemistry of the proton elimination in the formation of (+)- and (-)-alpha-pinene by monoterpene cyclases from sage (Salvia officinalis). Arch Biochem Biophys 1994; 308:488-96. [PMID: 8109979 DOI: 10.1006/abbi.1994.1069] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The three pinene synthases (cyclases) from common sage (Salvia officinalis) catalyze the conversion of geranyl pyrophosphate to the bicyclic olefins (+)-alpha-pinene and (+)-camphene (cyclase I), (-)-alpha-pinene, (-)-beta-pinene, and (-)-camphene (cyclase II), and (+)-alpha-pinene and (+)-beta-pinene (cyclase III), in addition to smaller amounts of monocyclic and acyclic monoterpene olefins. (1R)-4-2H1- and (1S)-4-2H1-labeled geranyl pyrophosphates were prepared and used to examine the stereochemistry of the C3-proton elimination from the pinyl cation intermediates in the formation of the alpha-pinene enantiomers. Mass spectrometric analysis of the biosynthetic products derived from the chirally deuterated substrates revealed that cyclase I and cyclase III removed the C4-proR-hydrogen of the substrate (C3 proton trans to the dimethyl bridge of the pinyl nucleus) with a stereoselectivity exceeding 94% in the formation of (+)-alpha-pinene. Similarly, cyclase II removed the C4-proS-hydrogen of the substrate (C3-trans proton of the corresponding pinyl cation) with a stereoselectivity exceeding 78% in the formation of (-)-alpha-pinene. The stereoselectivity of these C3-axial hydrogen eliminations is rationalized on the basis of a stereochemical model for the electrophilic isomerization-cyclization reaction sequence catalyzed by the pinene cyclases. The changes in the overall rates of olefin biosynthesis by these enzymes and in the product ratios resulting from deuterium substitution also permitted confirmation of isotopically sensitive branching in pinene biosynthesis and allowed the observation of primary kinetic isotope effects in isolation.
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Affiliation(s)
- H J Pyun
- Department of Chemistry, University of Illinois, Urbana 61801
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