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He YH, Xiang H, Li QX, Wu YF, Jin ZX, Hu JF, Mao YC, Xiong J. Liriogerphines E-U, further unique sesquiterpene-alkaloid hybrids from the rare Chinese tulip tree. PHYTOCHEMISTRY 2024; 218:113956. [PMID: 38135206 DOI: 10.1016/j.phytochem.2023.113956] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 11/30/2023] [Accepted: 12/19/2023] [Indexed: 12/24/2023]
Abstract
Seventeen undescribed sesquiterpene-alkaloid hybrids (liriogerphines E-U, 1-17) were isolated and identified during a further phytochemical investigation on the branches and leaves of Chinese tulip tree (Liriodendron chinense), a rare medicinal and ornamental plant endemic to China. These unique heterodimers are conjugates of germacranolide-type sesquiterpenoids with structurally diverse alkaloids [i.e., aporphine- (1-15), proaporphine- (16), and benzyltetrahydroisoquinoline-type (17)] via the formation of a C-N bond. The previously undescribed structures were elucidated by comprehensive spectroscopic data analyses and electronic circular dichroism calculations. Such a class of sesquiterpene-alkaloid hybrids presumably biosynthesized via an aza-Michael addition is quite rare from terrestrial plants. In particular, the sesquiterpene-benzyltetrahydroisoquinoline hybrid skeleton has never been reported until the present study. All the isolates were evaluated for their cytotoxic effects against a small panel of leukemia cell lines (Raji, Jeko-1, Daudi, Jurkat, MV-4-11 and HL-60), and some of them exhibited considerable activities.
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Affiliation(s)
- Yu-Hang He
- School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Hong Xiang
- School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Qi-Xiu Li
- School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Yu-Fei Wu
- School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Ze-Xin Jin
- Institute of Natural Medicine and Health Products, School of Pharmaceutical Sciences, Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, Zhejiang, 318000, China
| | - Jin-Feng Hu
- Institute of Natural Medicine and Health Products, School of Pharmaceutical Sciences, Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, Zhejiang, 318000, China.
| | - Yi-Cheng Mao
- School of Pharmacy, Fudan University, Shanghai, 201203, China.
| | - Juan Xiong
- School of Pharmacy, Fudan University, Shanghai, 201203, China.
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Novel Aporphine- and Proaporphine-Clerodane Hybrids Identified from the Barks of Taiwanese Polyalthia longifolia (Sonn.) Thwaites var. pendula with Strong Anti-DENV2 Activity. Pharmaceuticals (Basel) 2022; 15:ph15101218. [PMID: 36297330 PMCID: PMC9610793 DOI: 10.3390/ph15101218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 09/20/2022] [Accepted: 09/28/2022] [Indexed: 11/16/2022] Open
Abstract
Hybrid natural products produced via mixed biosynthetic pathways are unique and often surprise one with unexpected medicinal properties in addition to their fascinating structural complexity/diversity. In view of chemical structures, hybridization is a way of diversifying natural products usually through dimerization of two similar or dissimilar subcomponents through a C-C or N-C covalent linkage. Here, we report four structurally attractive diterpene-alkaloid conjugates polyalongarins A-D (1-4), clerodane-containing aporphine and proaporphine alkaloids, the first of its kind from the barks of Taiwanese Polyalthia longifolia (Sonn.) Thwaites var. pendula. In addition to conventional spectroscopic analysis, single crystal X-ray crystallography was employed to determine the chemical structures and stereo-configurations of 1. Compounds 1-4 were subsequently subjected to in vitro antiviral examination against DENV2 by evaluating the expression level of the NS2B protein in DENV2-infected Huh-7 cells. These compounds display encouraging anti-DENV2 activity with superb EC50 (2.8-6.4 μM) and CC50 values (50.4-200 μM). The inhibitory mechanism of 1-4 on NS2B was further explored drawing on in-silico molecular docking analysis. Based on calculated binding affinities and predicted interactions between the functional groups of 1-4 and the allosteric-site residues of the DENV2 NS2B-NS3 protease, our analysis concludes that the clerodane-aporphine/proaporphine-type hybrids are novel and effective DENV NS2B-NS3 protease inhibitors.
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Li H, Shu S, Kalaitzis JA, Shang Z, Vuong D, Crombie A, Lacey E, Piggott AM, Chooi YH. Genome Mining of Aspergillus hancockii Unearths Cryptic Polyketide Hancockinone A Featuring a Prenylated 6/6/6/5 Carbocyclic Skeleton. Org Lett 2021; 23:8789-8793. [PMID: 34747627 DOI: 10.1021/acs.orglett.1c03283] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Activation of a cryptic polyketide synthase gene cluster hkn from Aspergillus hancockii via overexpression of the gene-cluster-specific transcription factor HknR led to the discovery of a novel polycyclic metabolite, which we named hancockinone A. The compound features an unprecedented prenylated 6/6/6/5 tetracarbocyclic skeleton and shows moderate antibacterial activity. Heterologous expression, substrate feeding, and in vitro assays confirmed the role of cytochrome P450 HknE in constructing the five-membered ring in hancockinone A from the precursor neosartoricin B.
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Affiliation(s)
- Hang Li
- School of Molecular Sciences, The University of Western Australia, Perth, WA 6009, Australia
| | - Si Shu
- School of Molecular Sciences, The University of Western Australia, Perth, WA 6009, Australia
| | - John A Kalaitzis
- Department of Molecular Sciences, Macquarie University, Sydney, NSW 2109, Australia.,Microbial Screening Technologies Pty. Ltd., Smithfield, NSW 2164, Australia
| | - Zhuo Shang
- School of Molecular Sciences, The University of Western Australia, Perth, WA 6009, Australia
| | - Daniel Vuong
- Microbial Screening Technologies Pty. Ltd., Smithfield, NSW 2164, Australia
| | - Andrew Crombie
- Microbial Screening Technologies Pty. Ltd., Smithfield, NSW 2164, Australia
| | - Ernest Lacey
- Department of Molecular Sciences, Macquarie University, Sydney, NSW 2109, Australia.,Microbial Screening Technologies Pty. Ltd., Smithfield, NSW 2164, Australia
| | - Andrew M Piggott
- Department of Molecular Sciences, Macquarie University, Sydney, NSW 2109, Australia
| | - Yit-Heng Chooi
- School of Molecular Sciences, The University of Western Australia, Perth, WA 6009, Australia
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Li Y, Zhuo L, Li X, Zhu Y, Wu S, Shen T, Hu W, Li YZ, Wu C. Myxadazoles, Myxobacterium-Derived Isoxazole-Benzimidazole Hybrids with Cardiovascular Activities. Angew Chem Int Ed Engl 2021; 60:21679-21684. [PMID: 34314077 DOI: 10.1002/anie.202106275] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 07/05/2021] [Indexed: 12/14/2022]
Abstract
There is a continuous need for novel microbial natural products to fill the drying-up drug development pipeline. Herein, we report myxadazoles from Myxococcus sp. SDU36, a family of novel chimeric small molecules that consist of N-ribityl 5,6-dimethylbenzimidazole and a linear fatty acid chain endowed with an isoxazole ring. The experiments of genome sequencing, gene insertion mutation, isotope labelling, and precursor feeding demonstrated that the fatty acid chain was encoded by a non-canonical PKS/NRPS gene cluster, whereas the origin of N-ribityl 5,6-dimethylbenzimidazole was related to the vitamin B12 metabolism. The convergence of these two distinct biosynthetic pathways through a C-N coupling led to the unique chemical framework of myxadazoles, which is an unprecedented hybridization mode in the paradigm of natural products. Myxadazoles exhibited potent vasculogenesis promotion effect and moderate antithrombotic activity, underscoring their potential usage for the treatment of cardiovascular diseases.
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Affiliation(s)
- Yuelan Li
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, No. 72 Binhai Avenue, Qingdao, 266237, P. R. China
| | - Li Zhuo
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, No. 72 Binhai Avenue, Qingdao, 266237, P. R. China
| | - Xiaobin Li
- Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), No. 28789 Jingshi Dong Road, Jinan, 250103, P. R. China
| | - Yongqiang Zhu
- Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), No. 28789 Jingshi Dong Road, Jinan, 250103, P. R. China
| | - Shuge Wu
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, No. 72 Binhai Avenue, Qingdao, 266237, P. R. China
| | - Tao Shen
- Key Lab of Chemical Biology (MOE), School of Pharmaceutical Sciences, Shandong University, No. 44 West Wenhua Road, Jinan, 250012, P. R. China
| | - Wei Hu
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, No. 72 Binhai Avenue, Qingdao, 266237, P. R. China
| | - Yue-Zhong Li
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, No. 72 Binhai Avenue, Qingdao, 266237, P. R. China
| | - Changsheng Wu
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, No. 72 Binhai Avenue, Qingdao, 266237, P. R. China
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Li Y, Zhuo L, Li X, Zhu Y, Wu S, Shen T, Hu W, Li Y, Wu C. Myxadazoles, Myxobacterium‐Derived Isoxazole–Benzimidazole Hybrids with Cardiovascular Activities. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202106275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yuelan Li
- State Key Laboratory of Microbial Technology Institute of Microbial Technology Shandong University No. 72 Binhai Avenue Qingdao 266237 P. R. China
| | - Li Zhuo
- State Key Laboratory of Microbial Technology Institute of Microbial Technology Shandong University No. 72 Binhai Avenue Qingdao 266237 P. R. China
| | - Xiaobin Li
- Biology Institute Qilu University of Technology (Shandong Academy of Sciences) No. 28789 Jingshi Dong Road Jinan 250103 P. R. China
| | - Yongqiang Zhu
- Biology Institute Qilu University of Technology (Shandong Academy of Sciences) No. 28789 Jingshi Dong Road Jinan 250103 P. R. China
| | - Shuge Wu
- State Key Laboratory of Microbial Technology Institute of Microbial Technology Shandong University No. 72 Binhai Avenue Qingdao 266237 P. R. China
| | - Tao Shen
- Key Lab of Chemical Biology (MOE) School of Pharmaceutical Sciences Shandong University No. 44 West Wenhua Road Jinan 250012 P. R. China
| | - Wei Hu
- State Key Laboratory of Microbial Technology Institute of Microbial Technology Shandong University No. 72 Binhai Avenue Qingdao 266237 P. R. China
| | - Yue‐Zhong Li
- State Key Laboratory of Microbial Technology Institute of Microbial Technology Shandong University No. 72 Binhai Avenue Qingdao 266237 P. R. China
| | - Changsheng Wu
- State Key Laboratory of Microbial Technology Institute of Microbial Technology Shandong University No. 72 Binhai Avenue Qingdao 266237 P. R. China
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