1
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Wang C, Zhou Y, Yang L, Hu H, Chen J, Ying Y, Wang H. Discovery of 2,5-diketopiperazine alkaloids with quorum sensing inhibitory activity from the marine fungus Penicillium sp. ZJUT-34. Nat Prod Res 2024; 38:3605-3612. [PMID: 37708419 DOI: 10.1080/14786419.2023.2258441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 08/26/2023] [Accepted: 09/06/2023] [Indexed: 09/16/2023]
Abstract
One new 2,5-DKP derivative O-dihydroxycyclopenol (1) and seven known congeners 2-8 were isolated from the marine fungus Penicillium sp. ZJUT-34 cultured on rice medium. The planar structure of 1 was established by extensive spectroscopic analysis, including 1D, 2D NMR and HR-ESI-MS, while the relative configuration of 1 was determined by quantum chemical calculation. In the QS inhibitory assay, 1 significantly inhibited the production of violacein in Chromobacterium violaceum ATCC12472 (20.65%) at a concentration of 6.25 μg/mL without affecting the growth of the strain, as compared with norharmane (22.14%), a quorum sensing inhibitor (QSI) identified in our previous study. It represented the first report on the QS inhibitory activity of the seven-membered 2,5-DKPs. In addition, compounds 1-8 were subjected to antibacterial assay against six pathogenic bacteria Compound 8 exhibited comparable antibacterial activity against Enterococcus faecalis FA2-2 (MIC = 96 μg/mL) with the positive control gentamicin (MIC = 80 μg/mL).
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Affiliation(s)
- Cancan Wang
- College of Pharmaceutical Science & Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou, China
| | - Ying Zhou
- College of Pharmaceutical Science & Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou, China
| | - Lei Yang
- College of Pharmaceutical Science & Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou, China
| | - Hangqi Hu
- College of Pharmaceutical Science & Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou, China
| | - Jianwei Chen
- College of Pharmaceutical Science & Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou, China
| | - Youmin Ying
- College of Pharmaceutical Science & Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou, China
- Key Laboratory of Marine Fishery Resources Exploitment and Utilization of Zhejiang Province, Zhejiang University of Technology, Hangzhou, China
| | - Hong Wang
- College of Pharmaceutical Science & Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou, China
- Key Laboratory of Marine Fishery Resources Exploitment and Utilization of Zhejiang Province, Zhejiang University of Technology, Hangzhou, China
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2
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Li Q, Zheng Y, Guo L, Xiao Y, Li H, Yang P, Xia L, Liu X, Chen Z, Li L, Zhang H. Microbial Degradation of Tetracycline Antibiotics: Mechanisms and Environmental Implications. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024. [PMID: 38835142 DOI: 10.1021/acs.jafc.4c02677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
The escalating global consumption of tetracyclines (TCs) as broad-spectrum antibiotics necessitates innovative approaches to mitigate their pervasive environmental persistence and associated risks. While initiatives such as China's antimicrobial reduction efforts highlight the urgency of responsible TC usage, the need for efficient degradation methods remains paramount. Microbial degradation emerges as a promising solution, offering novel insights into degradation pathways and mechanisms. Despite challenges, including the optimization of microbial activity conditions and the risk of antibiotic resistance development, microbial degradation showcases significant innovation in its cost-effectiveness, environmental friendliness, and simplicity of implementation compared to traditional degradation methods. While the published reviews have summarized some aspects of biodegradation of TCs, a systematic and comprehensive summary of all the TC biodegradation pathways, reactions, intermediates, and final products including ring-opening products involved with enzymes and mechanisms of each bacterium and fungus reported is necessary. This review aims to fill the current gap in the literature by offering a thorough and systematic overview of the structure, bioactivity mechanism, detection methods, microbial degradation pathways, and molecular mechanisms of all tetracycline antibiotics in various microorganisms. It comprehensively collects and analyzes data on the microbial degradation pathways, including bacteria and fungi, intermediate and final products, ring-opening products, product toxicity, and the degradation mechanisms for all tetracyclines. Additionally, it points out future directions for the discovery of degradation-related genes/enzymes and microbial resources that can effectively degrade tetracyclines. This review is expected to contribute to advancing knowledge in this field and promoting the development of sustainable remediation strategies for contaminated environments.
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Affiliation(s)
- Qin Li
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, People's Republic of China
- Engineering Research Center of Industrial Microbiology, Ministry of Education, Fuzhou, Fujian 350117, People's Republic of China
- Collaborative Innovation Center of Hai'xi Green Bio-Manufacturing Technology, Ministry of Education, Fuzhou, Fujian 350117, People's Republic of China
| | - Yanhong Zheng
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, People's Republic of China
| | - Lijun Guo
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, People's Republic of China
- Engineering Research Center of Industrial Microbiology, Ministry of Education, Fuzhou, Fujian 350117, People's Republic of China
| | - Ying Xiao
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, People's Republic of China
| | - Haiyue Li
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, People's Republic of China
| | - Pingping Yang
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, People's Republic of China
| | - Li Xia
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, People's Republic of China
- Collaborative Innovation Center of Hai'xi Green Bio-Manufacturing Technology, Ministry of Education, Fuzhou, Fujian 350117, People's Republic of China
| | - Xiangqing Liu
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, People's Republic of China
| | - Zhangyan Chen
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, People's Republic of China
- Collaborative Innovation Center of Hai'xi Green Bio-Manufacturing Technology, Ministry of Education, Fuzhou, Fujian 350117, People's Republic of China
| | - Li Li
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, People's Republic of China
- Engineering Research Center of Industrial Microbiology, Ministry of Education, Fuzhou, Fujian 350117, People's Republic of China
- Collaborative Innovation Center of Hai'xi Green Bio-Manufacturing Technology, Ministry of Education, Fuzhou, Fujian 350117, People's Republic of China
| | - Huaidong Zhang
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, People's Republic of China
- Engineering Research Center of Industrial Microbiology, Ministry of Education, Fuzhou, Fujian 350117, People's Republic of China
- Collaborative Innovation Center of Hai'xi Green Bio-Manufacturing Technology, Ministry of Education, Fuzhou, Fujian 350117, People's Republic of China
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3
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Gao Y, Guo L, Liu X, Chen N, Yang X, Zhang Q. Advances in the synthesis and applications of macrocyclic polyamines. ROYAL SOCIETY OPEN SCIENCE 2024; 11:231979. [PMID: 39092147 PMCID: PMC11293801 DOI: 10.1098/rsos.231979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 03/03/2024] [Accepted: 04/10/2024] [Indexed: 08/04/2024]
Abstract
Macrocyclic polyamines constitute a significant class of macrocyclic compounds that play a pivotal role in the realm of supramolecular chemistry. They find extensive applications across diverse domains including industrial and agricultural production, clinical diagnostics, environmental protection and other multidisciplinary fields. Macrocyclic polyamines possess a distinctive cavity structure with varying sizes, depths, electron-richness degrees and flexibilities. This unique feature enables them to form specific supramolecular structures through complexation with diverse objects, thereby attracting considerable attention from chemists, biologists and materials scientists alike. However, there is currently a lack of comprehensive summaries on the synthesis methods for macrocyclic polyamines. In this review article, we provide an in-depth introduction to the synthesis of macrocyclic polyamines while analysing their respective advantages and disadvantages. Furthermore, we also present an overview of the recent 5-year advancements in using macrocyclic polyamines as non-viral gene vectors, fluorescent probes, diagnostic and therapeutic reagents as well as catalysts. Looking ahead to future research directions on the synthesis and application of macrocyclic polyamines across various fields will hopefully inspire new ideas for their synthesis and use.
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Affiliation(s)
- Yongguang Gao
- Department of Chemistry, Tangshan Normal University, Tangshan063000, People’s Republic of China
- Hebei Key Laboratory of Degradable Polymers, Tangshan Normal University, Tangshan063000, People’s Republic of China
- Tangshan Silicone Key Laboratory, Tangshan Normal University, Tangshan063000, People’s Republic of China
| | - Lina Guo
- Tangshan First Vocational Secondary Specialized School, Tangshan 063000, People’s Republic of China
| | - Xinhua Liu
- Department of Chemistry, Tangshan Normal University, Tangshan063000, People’s Republic of China
- Hebei Key Laboratory of Degradable Polymers, Tangshan Normal University, Tangshan063000, People’s Republic of China
- Tangshan Silicone Key Laboratory, Tangshan Normal University, Tangshan063000, People’s Republic of China
| | - Na Chen
- Department of Chemistry, Tangshan Normal University, Tangshan063000, People’s Republic of China
- Hebei Key Laboratory of Degradable Polymers, Tangshan Normal University, Tangshan063000, People’s Republic of China
- Tangshan Silicone Key Laboratory, Tangshan Normal University, Tangshan063000, People’s Republic of China
| | - Xiaochun Yang
- Department of Chemistry, Tangshan Normal University, Tangshan063000, People’s Republic of China
- Hebei Key Laboratory of Degradable Polymers, Tangshan Normal University, Tangshan063000, People’s Republic of China
- Tangshan Silicone Key Laboratory, Tangshan Normal University, Tangshan063000, People’s Republic of China
| | - Qing Zhang
- Department of Chemistry, Tangshan Normal University, Tangshan063000, People’s Republic of China
- Hebei Key Laboratory of Degradable Polymers, Tangshan Normal University, Tangshan063000, People’s Republic of China
- Tangshan Silicone Key Laboratory, Tangshan Normal University, Tangshan063000, People’s Republic of China
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4
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Waltz TB, Chao D, Prodoehl EK, Enders JD, Ehlers VL, Dharanikota BS, Dahms NM, Isaeva E, Hogan QH, Pan B, Stucky CL. Fabry disease Schwann cells release p11 to induce sensory neuron hyperactivity. JCI Insight 2024; 9:e172869. [PMID: 38646936 PMCID: PMC11141882 DOI: 10.1172/jci.insight.172869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 03/05/2024] [Indexed: 04/25/2024] Open
Abstract
Patients with Fabry disease suffer from chronic debilitating pain and peripheral sensory neuropathy with minimal treatment options, but the cellular drivers of this pain are unknown. Here, we propose a mechanism we believe to be novel in which altered signaling between Schwann cells and sensory neurons underlies the peripheral sensory nerve dysfunction we observed in a genetic rat model of Fabry disease. Using in vivo and in vitro electrophysiological recordings, we demonstrated that Fabry rat sensory neurons exhibited pronounced hyperexcitability. Schwann cells probably contributed to this finding because application of mediators released from cultured Fabry Schwann cells induced spontaneous activity and hyperexcitability in naive sensory neurons. We examined putative algogenic mediators using proteomic analysis and found that Fabry Schwann cells released elevated levels of the protein p11 (S100A10), which induced sensory neuron hyperexcitability. Removal of p11 from Fabry Schwann cell media caused hyperpolarization of neuronal resting membrane potentials, indicating that p11 may contribute to the excessive neuronal excitability caused by Fabry Schwann cells. These findings demonstrate that sensory neurons from rats with Fabry disease exhibit hyperactivity caused in part by Schwann cell release of the protein p11.
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Affiliation(s)
| | | | | | | | | | | | - Nancy M. Dahms
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Elena Isaeva
- Department of Cell Biology, Neurobiology & Anatomy
| | | | - Bin Pan
- Department of Anesthesiology; and
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5
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Efe O, Gassen RB, Morena L, Ganchiku Y, Al Jurdi A, Lape IT, Ventura-Aguiar P, LeGuern C, Madsen JC, Shriver Z, Babcock GJ, Borges TJ, Riella LV. A humanized IL-2 mutein expands Tregs and prolongs transplant survival in preclinical models. J Clin Invest 2024; 134:e173107. [PMID: 38426492 PMCID: PMC10904054 DOI: 10.1172/jci173107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Accepted: 01/05/2024] [Indexed: 03/02/2024] Open
Abstract
Long-term organ transplant survival remains suboptimal, and life-long immunosuppression predisposes transplant recipients to an increased risk of infection, malignancy, and kidney toxicity. Promoting the regulatory arm of the immune system by expanding Tregs may allow immunosuppression minimization and improve long-term graft outcomes. While low-dose IL-2 treatment can expand Tregs, it has a short half-life and off-target expansion of NK and effector T cells, limiting its clinical applicability. Here, we designed a humanized mutein IL-2 with high Treg selectivity and a prolonged half-life due to the fusion of an Fc domain, which we termed mIL-2. We showed selective and sustainable Treg expansion by mIL-2 in 2 murine models of skin transplantation. This expansion led to donor-specific tolerance through robust increases in polyclonal and antigen-specific Tregs, along with enhanced Treg-suppressive function. We also showed that Treg expansion by mIL-2 could overcome the failure of calcineurin inhibitors or costimulation blockade to prolong the survival of major-mismatched skin grafts. Validating its translational potential, mIL-2 induced a selective and sustainable in vivo Treg expansion in cynomolgus monkeys and showed selectivity for human Tregs in vitro and in a humanized mouse model. This work demonstrated that mIL-2 can enhance immune regulation and promote long-term allograft survival, potentially minimizing immunosuppression.
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Affiliation(s)
- Orhan Efe
- Center for Transplantation Sciences, Department of Surgery
- Division of Nephrology, Department of Medicine, and
| | | | - Leela Morena
- Center for Transplantation Sciences, Department of Surgery
| | | | - Ayman Al Jurdi
- Center for Transplantation Sciences, Department of Surgery
- Division of Nephrology, Department of Medicine, and
| | | | | | | | - Joren C. Madsen
- Center for Transplantation Sciences, Department of Surgery
- Division of Cardiac Surgery, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | | | | | | | - Leonardo V. Riella
- Center for Transplantation Sciences, Department of Surgery
- Division of Nephrology, Department of Medicine, and
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6
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De BC, Yang C, Huang C, Zhang C, Zhang W. Non-enzymatic synthesis of C-methylated fluostatins: discovery and reaction mechanism. Org Biomol Chem 2024; 22:1152-1156. [PMID: 38214554 DOI: 10.1039/d3ob01920a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
Two C-methylated fluostatins (FSTs) B3 (1) and B4 (2) were synthesized from flavin-mediated nonenzymatic epoxide ring-opening reactions of FST C. The structures of 1 and 2 were elucidated by HRESIMS, NMR, and ECD spectroscopic analyses. A subsequent 13C labeling study demonstrated that the C-methyl groups of 1 and 2 were derived from DMSO and enabled the mechanistic proposal of a nonenzymatic C-methylation.
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Affiliation(s)
- Bidhan Chandra De
- Key Laboratory of Tropical Marine Bioresources and Ecology, Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology Chinese Academy of Sciences, Guangzhou 510301, China.
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Chunfang Yang
- Key Laboratory of Tropical Marine Bioresources and Ecology, Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology Chinese Academy of Sciences, Guangzhou 510301, China.
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Chunshuai Huang
- Key Laboratory of Tropical Marine Bioresources and Ecology, Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology Chinese Academy of Sciences, Guangzhou 510301, China.
| | - Changsheng Zhang
- Key Laboratory of Tropical Marine Bioresources and Ecology, Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology Chinese Academy of Sciences, Guangzhou 510301, China.
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Wenjun Zhang
- Key Laboratory of Tropical Marine Bioresources and Ecology, Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology Chinese Academy of Sciences, Guangzhou 510301, China.
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
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7
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Raut NG, Maile LA, Oswalt LM, Mitxelena I, Adlakha A, Sprague KL, Rupert AR, Bokros L, Hofmann MC, Patritti-Cram J, Rizvi TA, Queme LF, Choi K, Ratner N, Jankowski MP. Schwann cells modulate nociception in neurofibromatosis 1. JCI Insight 2024; 9:e171275. [PMID: 38258905 PMCID: PMC10906222 DOI: 10.1172/jci.insight.171275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 11/28/2023] [Indexed: 01/24/2024] Open
Abstract
Pain of unknown etiology is frequent in individuals with the tumor predisposition syndrome neurofibromatosis 1 (NF1), even when tumors are absent. Nerve Schwann cells (SCs) were recently shown to play roles in nociceptive processing, and we find that chemogenetic activation of SCs is sufficient to induce afferent and behavioral mechanical hypersensitivity in wild-type mice. In mouse models, animals showed afferent and behavioral hypersensitivity when SCs, but not neurons, lacked Nf1. Importantly, hypersensitivity corresponded with SC-specific upregulation of mRNA encoding glial cell line-derived neurotrophic factor (GDNF), independently of the presence of tumors. Neuropathic pain-like behaviors in the NF1 mice were inhibited by either chemogenetic silencing of SC calcium or by systemic delivery of GDNF-targeting antibodies. Together, these findings suggest that alterations in SCs directly modulate mechanical pain and suggest cell-specific treatment strategies to ameliorate pain in individuals with NF1.
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Affiliation(s)
- Namrata G.R. Raut
- Department of Anesthesia, Division of Pain Management, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Laura A. Maile
- Department of Anesthesia, Division of Pain Management, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Leila M. Oswalt
- Department of Anesthesia, Division of Pain Management, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Irati Mitxelena
- Department of Anesthesia, Division of Pain Management, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Aaditya Adlakha
- Department of Anesthesia, Division of Pain Management, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Kourtney L. Sprague
- Department of Anesthesia, Division of Pain Management, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Ashley R. Rupert
- Department of Anesthesia, Division of Pain Management, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Lane Bokros
- Department of Anesthesia, Division of Pain Management, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Megan C. Hofmann
- Department of Anesthesia, Division of Pain Management, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Jennifer Patritti-Cram
- Graduate Program in Neuroscience, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
- Division of Cancer Biology and Experimental Hematology and
| | - Tilat A. Rizvi
- Division of Cancer Biology and Experimental Hematology and
| | - Luis F. Queme
- Department of Anesthesia, Division of Pain Management, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
- Pediatric Pain Research Center, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Kwangmin Choi
- Division of Cancer Biology and Experimental Hematology and
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Nancy Ratner
- Division of Cancer Biology and Experimental Hematology and
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Michael P. Jankowski
- Department of Anesthesia, Division of Pain Management, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
- Pediatric Pain Research Center, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
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8
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Sikandar A, Popoff A, Jumde RP, Mándi A, Kaur A, Elgaher WAM, Rosenberger L, Hüttel S, Jansen R, Hunter M, Köhnke J, Hirsch AKH, Kurtán T, Müller R. Revision of the Absolute Configurations of Chelocardin and Amidochelocardin. Angew Chem Int Ed Engl 2023; 62:e202306437. [PMID: 37466921 DOI: 10.1002/anie.202306437] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 07/17/2023] [Accepted: 07/18/2023] [Indexed: 07/20/2023]
Abstract
Even with the aid of the available methods, the configurational assignment of natural products can be a challenging task that is prone to errors, and it sometimes needs to be corrected after total synthesis or single-crystal X-ray diffraction (XRD) analysis. Herein, the absolute configuration of amidochelocardin is revised using a combination of XRD, NMR spectroscopy, experimental ECD spectra, and time-dependent density-functional theory (TDDFT)-ECD calculations. As amidochelocardin was obtained via biosynthetic engineering of chelocardin, we propose the same absolute configuration for chelocardin based on the similar biosynthetic origins of the two compounds and result of TDDFT-ECD calculations. The evaluation of spectral data of two closely related analogues, 6-desmethyl-chelocardin and its semisynthetic derivative 1, also supports this conclusion.
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Affiliation(s)
- Asfandyar Sikandar
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) -, Helmholtz Centre for Infection Research (HZI), Campus Building E8.1, 66123, Saarbrücken, Germany
| | - Alexander Popoff
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) -, Helmholtz Centre for Infection Research (HZI), Campus Building E8.1, 66123, Saarbrücken, Germany
| | - Ravindra P Jumde
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) -, Helmholtz Centre for Infection Research (HZI), Campus Building E8.1, 66123, Saarbrücken, Germany
| | - Attila Mándi
- Department of Organic Chemistry University of Debrecen, P. O. Box 400, 4002, Debrecen, Hungary
| | - Amninder Kaur
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) -, Helmholtz Centre for Infection Research (HZI), Campus Building E8.1, 66123, Saarbrücken, Germany
| | - Walid A M Elgaher
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) -, Helmholtz Centre for Infection Research (HZI), Campus Building E8.1, 66123, Saarbrücken, Germany
| | - Lara Rosenberger
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) -, Helmholtz Centre for Infection Research (HZI), Campus Building E8.1, 66123, Saarbrücken, Germany
- Department of Pharmacy, Saarland University, Campus Building E8.1, 66123, Saarbrücken, Germany
- Discovery and Development Technologies (DDTech), Merck KGaA, Frankfurter Strasse 250, 64293, Darmstadt, Germany
| | - Stephan Hüttel
- German Centre for Infection Research (DZIF), Partner Site Hannover-Braunschweig, 38124, Braunschweig, Germany
- Department of Microbial Drugs, Helmholtz Centre for Infection Research (HZI), 38124, Braunschweig, Germany
| | - Rolf Jansen
- German Centre for Infection Research (DZIF), Partner Site Hannover-Braunschweig, 38124, Braunschweig, Germany
- Department of Microbial Drugs, Helmholtz Centre for Infection Research (HZI), 38124, Braunschweig, Germany
| | - Maja Hunter
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) -, Helmholtz Centre for Infection Research (HZI), Campus Building E8.1, 66123, Saarbrücken, Germany
| | - Jesko Köhnke
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) -, Helmholtz Centre for Infection Research (HZI), Campus Building E8.1, 66123, Saarbrücken, Germany
- School of Chemistry, University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK
| | - Anna K H Hirsch
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) -, Helmholtz Centre for Infection Research (HZI), Campus Building E8.1, 66123, Saarbrücken, Germany
- Department of Pharmacy, Saarland University, Campus Building E8.1, 66123, Saarbrücken, Germany
- Helmholtz International Lab for Anti-infectives, Campus Building E8.1, 66123, Saarbrücken, Germany
| | - Tibor Kurtán
- Department of Organic Chemistry University of Debrecen, P. O. Box 400, 4002, Debrecen, Hungary
| | - Rolf Müller
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) -, Helmholtz Centre for Infection Research (HZI), Campus Building E8.1, 66123, Saarbrücken, Germany
- Department of Pharmacy, Saarland University, Campus Building E8.1, 66123, Saarbrücken, Germany
- Helmholtz International Lab for Anti-infectives, Campus Building E8.1, 66123, Saarbrücken, Germany
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9
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Dai Y, Xie XL, Dai HF, Li SM. Formation of Fungal 2,18-Dioxo-2,18- seco Indole Diterpenes by Nonenzymatic Flavin-Catalyzed Oxidative Ring Expansion and Oxygen Incorporation from Solvent Water. Org Lett 2023; 25:4092-4097. [PMID: 37249271 DOI: 10.1021/acs.orglett.3c01320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Most naturally occurring indole diterpenes share a 6/5/5/6/6/6 hexacyclic ring system, while a 6/8/6/6/6 pentacyclic skeleton is occasionally observed. In this study, we demonstrate the formation of an eight-membered C-N heteroring via nonenzymatic flavin-catalyzed oxidative indole ring opening. More interestingly, 18O-labeled experiments proved that the two incorporated oxygen atoms are predominantly originated from water instead of molecular oxygen. In this process, the oxidized form of flavin catalyzes two successive oxidations of amines to imines with involvement of hydrolysis for the ring expansion. The reduced flavin is then regenerated by oxidation with molecular oxygen to form H2O2.
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Affiliation(s)
- Yu Dai
- Institut für Pharmazeutische Biologie und Biotechnologie, Fachbereich Pharmazie, Philipps-Universität Marburg, Robert-Koch-Straße 4, 35037 Marburg, Germany
| | - Xiu-Lan Xie
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany
| | - Hao-Fu Dai
- Research and Development of Natural Products from Li Folk Medicine, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agriculture Sciences, Haikou 571101, China
| | - Shu-Ming Li
- Institut für Pharmazeutische Biologie und Biotechnologie, Fachbereich Pharmazie, Philipps-Universität Marburg, Robert-Koch-Straße 4, 35037 Marburg, Germany
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Kovács T, Lajter I, Kúsz N, Schelz Z, Bózsity-Faragó N, Borbás A, Zupkó I, Krupitza G, Frisch R, Hohmann J, Vasas A, Mándi A. Isolation and NMR Scaling Factors for the Structure Determination of Lobatolide H, a Flexible Sesquiterpene from Neurolaena lobata. Int J Mol Sci 2023; 24:ijms24065841. [PMID: 36982924 PMCID: PMC10052924 DOI: 10.3390/ijms24065841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 03/11/2023] [Accepted: 03/13/2023] [Indexed: 03/30/2023] Open
Abstract
A new flexible germacranolide (1, lobatolide H) was isolated from the aerial parts of Neurolaena lobata. The structure elucidation was performed by classical NMR experiments and DFT NMR calculations. Altogether, 80 theoretical level combinations with existing 13C NMR scaling factors were tested, and the best performing ones were applied on 1. 1H and 13C NMR scaling factors were also developed for two combinations utilizing known exomethylene containing derivatives, and the results were complemented by homonuclear coupling constant (JHH) and TDDFT-ECD calculations to elucidate the stereochemistry of 1. Lobatolide H possessed remarkable antiproliferative activity against human cervical tumor cell lines with different HPV status (SiHa and C33A), induced cell cycle disturbance and exhibited a substantial antimigratory effect in SiHa cells.
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Affiliation(s)
- Tibor Kovács
- Department of Organic Chemistry, University of Debrecen, P.O. Box 400, 4002 Debrecen, Hungary
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, 4032 Debrecen, Hungary
| | - Ildikó Lajter
- Institute of Pharmacognosy, University of Szeged, Eötvös u. 6, 6720 Szeged, Hungary
| | - Norbert Kúsz
- Institute of Pharmacognosy, University of Szeged, Eötvös u. 6, 6720 Szeged, Hungary
| | - Zsuzsanna Schelz
- Institute of Pharmacodynamics and Biopharmacy, University of Szeged, Eötvös u. 6, 6720 Szeged, Hungary
| | - Noémi Bózsity-Faragó
- Institute of Pharmacodynamics and Biopharmacy, University of Szeged, Eötvös u. 6, 6720 Szeged, Hungary
| | - Anikó Borbás
- Department of Pharmaceutical Chemistry, University of Debrecen, Egyetem tér 1, 4032 Debrecen, Hungary
| | - István Zupkó
- Institute of Pharmacodynamics and Biopharmacy, University of Szeged, Eötvös u. 6, 6720 Szeged, Hungary
| | - Georg Krupitza
- Department of Pathology, Medical University of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria
| | - Richard Frisch
- Institute for Ethnobiology, Playa Diana, San José GT-170, Guatemala
| | - Judit Hohmann
- Institute of Pharmacognosy, University of Szeged, Eötvös u. 6, 6720 Szeged, Hungary
- ELKH-USZ Biologically Active Natural Products Research Group, University of Szeged, Eötvös u. 6, 6720 Szeged, Hungary
| | - Andrea Vasas
- Institute of Pharmacognosy, University of Szeged, Eötvös u. 6, 6720 Szeged, Hungary
- ELKH-USZ Biologically Active Natural Products Research Group, University of Szeged, Eötvös u. 6, 6720 Szeged, Hungary
| | - Attila Mándi
- Department of Organic Chemistry, University of Debrecen, P.O. Box 400, 4002 Debrecen, Hungary
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Yang C, Zhang L, Zhang W, Huang C, Zhu Y, Jiang X, Liu W, Zhao M, De BC, Zhang C. Biochemical and structural insights of multifunctional flavin-dependent monooxygenase FlsO1-catalyzed unexpected xanthone formation. Nat Commun 2022; 13:5386. [PMID: 36104338 PMCID: PMC9474520 DOI: 10.1038/s41467-022-33131-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 09/02/2022] [Indexed: 11/18/2022] Open
Abstract
Xanthone-containing natural products display diverse pharmacological properties. The biosynthetic mechanisms of the xanthone formation have not been well documented. Here we show that the flavoprotein monooxygenase FlsO1 in the biosynthesis of fluostatins not only functionally compensates for the monooxygenase FlsO2 in converting prejadomycin to dehydrorabelomycin, but also unexpectedly converts prejadomycin to xanthone-containing products by catalyzing three successive oxidations including hydroxylation, epoxidation and Baeyer-Villiger oxidation. We also provide biochemical evidence to support the physiological role of FlsO1 as the benzo[b]-fluorene C5-hydrolase by using nenestatin C as a substrate mimic. Finally, we resolve the crystal structure of FlsO1 in complex with the cofactor flavin adenine dinucleotide close to the “in” conformation to enable the construction of reactive substrate-docking models to understand the basis of a single enzyme-catalyzed multiple oxidations. This study highlights a mechanistic perspective for the enzymatic xanthone formation in actinomycetes and sets an example for the versatile functions of flavoproteins. The biosynthesis of xanthones has not been well documented. Here, the authors report that monooxygenase FlsO1 catalyzes three successive oxidations – hydroxylation, epoxidation and Baeyer–Villiger oxidation—to form the xanthone scaffold in actinomycetes.
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