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Rezgui SP, Farhi J, Yu H, Sercel ZP, Virgil SC, Stoltz BM. Divergent total syntheses of pyrroloiminoquinone alkaloids enabled by the development of a Larock/Buchwald-Hartwig annulation/cyclization. Chem Sci 2024; 15:12284-12290. [PMID: 39118607 PMCID: PMC11304541 DOI: 10.1039/d4sc02981j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Accepted: 06/20/2024] [Indexed: 08/10/2024] Open
Abstract
Pyrroloiminoquinone alkaloids are a large class of natural products that display a wide range of biological activities. Synthetic approaches to these natural products typically rely on a common late-stage C10-oxygenated pyrroloiminoquinone intermediate, but these strategies often lead to lengthy synthetic sequences that are not amenable to divergent syntheses. We devised an alternative approach aimed at the early introduction of the C10 nitrogen, which we hypothesized would enable late-stage diversification. This strategy hinged upon a Larock/Buchwald-Hartwig annulation/cyclization to quickly access the core of these alkaloids. We report the development of this cascade process, which was facilitated by a dual ligand system in addition to selective functionalization of the key intermediate, to provide efficient syntheses of makaluvamines A, C, and D and isobatzelline B, and the first total synthesis of makaluvamine N.
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Affiliation(s)
- Samir P Rezgui
- Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology Pasadena CA 91125 USA
| | - Jonathan Farhi
- Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology Pasadena CA 91125 USA
| | - Hao Yu
- Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology Pasadena CA 91125 USA
| | - Zachary P Sercel
- Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology Pasadena CA 91125 USA
| | - Scott C Virgil
- Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology Pasadena CA 91125 USA
| | - Brian M Stoltz
- Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology Pasadena CA 91125 USA
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2
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Karan D, Dubey S, Gunewardena S, Iczkowski KA, Singh M, Liu P, Poletti A, Choo Y, Chen H, Hamann MT. Manzamine A reduces androgen receptor transcription and synthesis by blocking E2F8-DNA interactions and effectively inhibits prostate tumor growth in mice. Mol Oncol 2024; 18:1966-1979. [PMID: 38605607 PMCID: PMC11306517 DOI: 10.1002/1878-0261.13637] [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: 11/03/2023] [Revised: 02/14/2024] [Accepted: 03/12/2024] [Indexed: 04/13/2024] Open
Abstract
The androgen receptor (AR) is the main driver in the development of castration-resistant prostate cancer, where the emergence of AR splice variants leads to treatment-resistant disease. Through detailed molecular studies of the marine alkaloid manzamine A (MA), we identified transcription factor E2F8 as a previously unknown regulator of AR transcription that prevents AR synthesis in prostate cancer cells. MA significantly inhibited the growth of various prostate cancer cell lines and was highly effective in inhibiting xenograft tumor growth in mice without any pathophysiological perturbations in major organs. MA suppressed the full-length AR (AR-FL), its spliced variant AR-V7, and the AR-regulated prostate-specific antigen (PSA; also known as KLK3) and human kallikrein 2 (hK2; also known as KLK2) genes. RNA sequencing (RNA-seq) analysis and protein modeling studies revealed E2F8 interactions with DNA as a potential novel target of MA, suppressing AR transcription and its synthesis. This novel mechanism of blocking AR biogenesis via E2F8 may provide an opportunity to control therapy-resistant prostate cancer over the currently used AR antagonists designed to target different parts of the AR gene.
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Affiliation(s)
- Dev Karan
- Department of Pathology, and MCW Cancer CenterMedical College of WisconsinMilwaukeeWIUSA
| | - Seema Dubey
- Department of Pathology, and MCW Cancer CenterMedical College of WisconsinMilwaukeeWIUSA
| | - Sumedha Gunewardena
- Department of Cell Biology and PhysiologyUniversity of Kansas Medical CenterKSUSA
| | - Kenneth A. Iczkowski
- Department of Pathology, and MCW Cancer CenterMedical College of WisconsinMilwaukeeWIUSA
| | - Manohar Singh
- Department of Pathology, and MCW Cancer CenterMedical College of WisconsinMilwaukeeWIUSA
| | - Pengyuan Liu
- Department of Physiology and Center of Systems Molecular MedicineMedical College of WisconsinMilwaukeeWIUSA
| | - Angelo Poletti
- Department of Pharmacological and Biomolecular SciencesUniversity of MilanItaly
| | - Yeun‐Mun Choo
- Department of ChemistryUniversity of MalayaKuala LumpurMalaysia
| | - Hui‐Zi Chen
- Department of MedicineMedical College of WisconsinMilwaukeeWIUSA
| | - Mark T. Hamann
- Department of Drug Discovery and Biomedical Sciences and Public Health, Colleges of Pharmacy and Medicine, Hollings Cancer CenterMedical University of South CarolinaCharlestonSCUSA
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3
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Wu XY, Zhao ZY, Osman EEA, Wang XJ, Choo YM, Benjamin MM, Xiong J, Hamann MT, Luo C, Hu JF. Platanosides from Platanus × acerifolia: New molecules, SAR, and target validation of a strong lead for drug-resistant bacterial infections and the associated sepsis. Bioorg Chem 2024; 143:107103. [PMID: 38211549 PMCID: PMC11238254 DOI: 10.1016/j.bioorg.2024.107103] [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: 11/30/2023] [Revised: 12/29/2023] [Accepted: 01/03/2024] [Indexed: 01/13/2024]
Abstract
Three undescribed (1-3) and nine known (4-12) platanosides were isolated and characterized from a bioactive extract of the May leaves of Platanus × acerifolia that initially showed inhibition against Staphylococcus aureus. Targeted compound mining was guided by an LC-MS/MS-based molecular ion networking (MoIN) strategy combined with conventional isolation procedures from a unique geographic location. The novel structures were mainly determined by 2D NMR and computational (NMR/ECD calculations) methods. Compound 1 is a rare acylated kaempferol rhamnoside possessing a truxinate unit. 6 (Z,E-platanoside) and 7 (E,E-platanoside) were confirmed to have remarkable inhibitory effects against both methicillin-resistant S. aureus (MIC: ≤ 16 μg/mL) and glycopeptide-resistant Enterococcus faecium (MIC: ≤ 1 μg/mL). These platanosides were subjected to docking analyses against FabI (enoyl-ACP reductase) and PBP1/2 (penicillin binding protein), both of which are pivotal enzymes governing bacterial growth but not found in the human host. The results showed that 6 and 7 displayed superior binding affinities towards FabI and PBP2. Moreover, surface plasmon resonance studies on the interaction of 1/7 and FabI revealed that 7 has a higher affinity (KD = 1.72 μM), which further supports the above in vitro data and is thus expected to be a novel anti-antibacterial drug lead.
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Affiliation(s)
- Xi-Ying Wu
- Institute of Natural Medicine and Health Products, School of Pharmaceutical Sciences, Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Zhejiang 318000, PR China; School of Pharmacy, Fudan University, Shanghai 201203, PR China; Shanghai Skin Disease Hospital, Tongji University School of Medicine, Shanghai 200443, PR China
| | - Ze-Yu Zhao
- Institute of Natural Medicine and Health Products, School of Pharmaceutical Sciences, Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Zhejiang 318000, PR China; School of Pharmacy, Fudan University, Shanghai 201203, PR China
| | - Ezzat E A Osman
- Department of Medicinal Chemistry, Theodor Bilharz Research Institute, Kornaish El-Nile St., Giza 12411, Egypt
| | - Xiao-Juan Wang
- School of Pharmacy, Lanzhou University, Lanzhou 730000, Gansu, PR China; Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston 29425-5700, USA
| | - Yeun-Mun Choo
- Chemistry Department, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia.
| | - Menny M Benjamin
- Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston 29425-5700, USA
| | - Juan Xiong
- School of Pharmacy, Fudan University, Shanghai 201203, PR China
| | - Mark T Hamann
- Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston 29425-5700, USA.
| | - Cheng Luo
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Science, Shanghai 201203, PR 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, Zhejiang 318000, PR China; School of Pharmacy, Fudan University, Shanghai 201203, PR China; Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston 29425-5700, USA.
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4
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Xie F, Sun Y, Zi ZF, Wang WJ, Wan DY, Zhou H, Ding ZT. Discovery of pyranonaphthoquinones and an eighteen-membered ring macrolide from the rhizospheric soil-derived fungus Phialocephala sp. YUD18001 by OSMAC strategy. Fitoterapia 2023; 171:105690. [PMID: 37757923 DOI: 10.1016/j.fitote.2023.105690] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 09/20/2023] [Accepted: 09/23/2023] [Indexed: 09/29/2023]
Abstract
Two new pyranonaphthoquinones, phialoyxinones A (1) and B (2), a new eighteen-membered ring lactone, phialoyxtone (3), and five known pyranonaphthoquinone derivatives were identified from the fungus Phialocephala sp. YUD18001, which was isolated from the rhizospheric soil associated with Gastrodia elata. Their structures were unequivocally established by a comprehensive interpretation of the spectroscopic data, with the stereochemistry for 1-3 was defined by a combination of TDDFT calculations, and the DP4+ probability analysis based on NMR chemical shift calculations. All of the new compounds 1-3 were evaluated for cytotoxicity and acetylcholinesterase inhibitory, compound 2 exhibited in vitro cytotoxic activities against five human cancer cell lines (HL-60, SMMC-7721, A549, MCF-7 and SW480) with IC50 values ranging from 11.80 to 19.32 μM. Compounds 2 and 3 exhibited moderate AChE inhibitory activities. A putative biosynthetic pathway for the pyranonaphthoquinones was proposed.
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Affiliation(s)
- Fei Xie
- Key Laboratory of Functional Molecules Analysis and Biotransformation of Universities in Yunnan Province, Yunnan Characteristic Plant Extraction Laboratory, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China; Institute of International Rivers and Eco-Security, Yunnan University, Kunming 650500, China
| | - Yue Sun
- Key Laboratory of Functional Molecules Analysis and Biotransformation of Universities in Yunnan Province, Yunnan Characteristic Plant Extraction Laboratory, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Zhi-Feng Zi
- Key Laboratory of Functional Molecules Analysis and Biotransformation of Universities in Yunnan Province, Yunnan Characteristic Plant Extraction Laboratory, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Wen-Jing Wang
- Key Laboratory of Functional Molecules Analysis and Biotransformation of Universities in Yunnan Province, Yunnan Characteristic Plant Extraction Laboratory, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Dai-Yu Wan
- Key Laboratory of Functional Molecules Analysis and Biotransformation of Universities in Yunnan Province, Yunnan Characteristic Plant Extraction Laboratory, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Hao Zhou
- Key Laboratory of Functional Molecules Analysis and Biotransformation of Universities in Yunnan Province, Yunnan Characteristic Plant Extraction Laboratory, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China.
| | - Zhong-Tao Ding
- Key Laboratory of Functional Molecules Analysis and Biotransformation of Universities in Yunnan Province, Yunnan Characteristic Plant Extraction Laboratory, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China; College of Traditional Chinese Medicine, Yunnan University of Chinese Medicine, Kunming 650500, China.
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5
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Yu H, Sercel ZP, Rezgui SP, Farhi J, Virgil SC, Stoltz BM. Total Synthesis of Aleutianamine. J Am Chem Soc 2023; 145:25533-25537. [PMID: 37967164 PMCID: PMC10690800 DOI: 10.1021/jacs.3c10212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Revised: 10/27/2023] [Accepted: 10/31/2023] [Indexed: 11/17/2023]
Abstract
Aleutianamine is a recently isolated pyrroloiminoquinone natural product that displays potent and selective biological activity toward human pancreatic cancer cells with an IC50 of 25 nM against PANC-1, making it a potential candidate for therapeutic development. We report a synthetic approach to aleutianamine wherein the unique [3.3.1] ring system and tertiary sulfide of this alkaloid were constructed via a novel palladium-catalyzed dearomative thiophene functionalization. Other highlights of the synthesis include a palladium-catalyzed decarboxylative pinacol-type rearrangement of an allylic carbonate to install a ketone and a late-stage oxidative amination. This concise and convergent strategy will enable access to analogues of aleutianamine and further investigation of the biological activity of this unique natural product.
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Affiliation(s)
| | | | - Samir P. Rezgui
- The Warren and Katharine
Schlinger Laboratory for Chemistry and Chemical Engineering, Division
of Chemistry and Chemical Engineering, California
Institute of Technology, Pasadena, California 91125, United States
| | - Jonathan Farhi
- The Warren and Katharine
Schlinger Laboratory for Chemistry and Chemical Engineering, Division
of Chemistry and Chemical Engineering, California
Institute of Technology, Pasadena, California 91125, United States
| | - Scott C. Virgil
- The Warren and Katharine
Schlinger Laboratory for Chemistry and Chemical Engineering, Division
of Chemistry and Chemical Engineering, California
Institute of Technology, Pasadena, California 91125, United States
| | - Brian M. Stoltz
- The Warren and Katharine
Schlinger Laboratory for Chemistry and Chemical Engineering, Division
of Chemistry and Chemical Engineering, California
Institute of Technology, Pasadena, California 91125, United States
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6
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Shimomura M, Ide K, Sakata J, Tokuyama H. Unified Divergent Total Synthesis of Discorhabdin B, H, K, and Aleutianamine via the Late-Stage Oxidative N,S-Acetal Formation. J Am Chem Soc 2023; 145:18233-18239. [PMID: 37556762 DOI: 10.1021/jacs.3c06578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
This study achieved the total syntheses of (+)-discorhabdin B, (-)-discorhabdin H, (+)-discorhabdin K, and (-)-aleutianamine. A phenethylamine fragment bearing a o-pivaloylthio group, corresponding to the D/E/G ring moiety, was prepared from benzothiophen-2-carboxylic acid methyl ester and condensed with a known pyrroloiminoquinone derivative. The adduct was subjected to [bis(trifluoroacetoxy)iodo]benzene (PIFA)-promoted oxidative spirocyclization to furnish the A/B/C/D/E spirocyclohexadienone fused with pyrroloiminoquinone. The total synthesis of (±)-discorhabdin B was completed via the key construction of the highly strained G ring with the N,S-acetal moiety featuring a newly developed CuBr2-mediated oxidative cascade cyclization. The stereocontrolled total synthesis of (+)-discorhabdin B was accomplished by a diastereoselective PIFA-promoted oxidative spirocyclization using a chiral thioester. (-)-Disocrhabdin H and (+)-discorhabdin K were synthesized by the site- and face-selective thia-Michael addition of l-ovothiol A to (+)-N-Ts-discorhabdin B with the concomitant formation of the F ring by forming the C2-N18 bond. The total synthesis of (-)-aleutianamine was achieved via a skeletal rearrangement initiated by the Luche reduction of the dienone moiety of (+)-N-Ts-discorhabdin B.
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Affiliation(s)
- Masashi Shimomura
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Kohta Ide
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Juri Sakata
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Hidetoshi Tokuyama
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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7
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Zhou PJ, Huang T, Ma GL, Tong YP, Chen WX, Zang Y, Xiong J, Li J, Hu JF. Forrestiacids E-K: Further [4 + 2]-Type Triterpene-Diterpene Hybrids as Potential ACL Inhibitors from the Vulnerable Conifer Pseudotsuga forrestii. JOURNAL OF NATURAL PRODUCTS 2023; 86:1251-1260. [PMID: 37196240 DOI: 10.1021/acs.jnatprod.3c00040] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Seven [4 + 2]-type triterpene-diterpene hybrids derived from a rearranged or a normal lanostane unit (dienophile) and an abietane moiety (diene), forrestiacids E-K (1-7, respectively), were further isolated and characterized from Pseudotsuga forrestii (a vulnerable conifer endemic to China). The intriguing molecules were revealed with the guidance of an LC-MS/MS-based molecular ion networking strategy combined with conventional phytochemical procedures. Their chemical structures with absolute configurations were established by spectroscopic data, chemical transformation, electronic circular dichroism calculations, and single-crystal X-ray diffraction analysis. They all contain a rare bicyclo[2.2.2]octene motif. Both forrestiacids J (6) and K (7) represent the first examples of this unique class of [4 + 2]-type hybrids that arose from a normal lanostane-type dienophile. Some isolates remarkably inhibited ATP-citrate lyase (ACL), with IC50 values ranging from 1.8 to 11 μM. Docking studies corroborated the findings by highlighting the interactions between the bioactive compounds and the ACL enzyme (binding affinities: -9.9 to -10.7 kcal/mol). The above findings reveal the important role of protecting plant species diversity in support of chemical diversity and potential sources of new therapeutics.
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Affiliation(s)
- Peng-Jun Zhou
- 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, People's Republic of China
- Department of Natural Medicine, School of Pharmacy, Fudan University, Shanghai 201203, People's Republic of China
| | - Ting Huang
- Department of Natural Medicine, School of Pharmacy, Fudan University, Shanghai 201203, People's Republic of China
| | - Guang-Lei Ma
- Department of Natural Medicine, School of Pharmacy, Fudan University, Shanghai 201203, People's Republic of China
| | - Ying-Peng Tong
- 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, People's Republic of China
| | - Wen-Xue Chen
- Department of Chemistry, Fudan University, Shanghai 200438, People's Republic of China
| | - Yi Zang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Science, Shanghai 201203, People's Republic of China
| | - Juan Xiong
- Department of Natural Medicine, School of Pharmacy, Fudan University, Shanghai 201203, People's Republic of China
| | - Jia Li
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Science, Shanghai 201203, People's Republic of 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, People's Republic of China
- Department of Natural Medicine, School of Pharmacy, Fudan University, Shanghai 201203, People's Republic of China
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8
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Liu Y, Gao P, Liang X, Zhang Y, Yu X, Xue X, Kockaya L, Pandey P, Doerksen RJ, Wang X, Yao G, Chu W, Chen X, Song S, Hamann MT, Li L. Prenylated flavonoids with significant anti-hepatoma activity from Daphne giraldii and effects on Fibroblast Growth Factor Receptor 1 (FGFR1). Eur J Med Chem 2023; 247:115006. [PMID: 36549116 PMCID: PMC11173874 DOI: 10.1016/j.ejmech.2022.115006] [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: 09/29/2022] [Revised: 11/23/2022] [Accepted: 12/03/2022] [Indexed: 12/14/2022]
Abstract
We report here the orchestration of molecular ion networking (MoIN) and a set of computational and informatics assisted structural elucidation approaches in the discovery of 23 new prenyl-flavonoids and 13 known molecules from Daphne giraldii Nitsche (Thymelaeaceae), some of which possess significant bioactivity against hepatoma carcinoma. Daphnegiratriprenylone A (DPTP-A) represents the class of polyprenyl-flavonoids possessing a triprenyl substitution, and was identified with the guidance of mass spectrometry and nuclear magnetic resonance combined with computational approaches. This approach illustrates a paradigm shift in the application of computational tools for the direct assignment of new natural product structures and it was demonstrated to be reliable compared to conventional 2D-NMR techniques. Seventeen compounds exhibited potent and selective activity against Hep3B cells (IC50 ranging from 0.42 to 7.08 μM). Tyrosine kinase FGFR1 has emerged as a potential target of polyprenyl-flavonoids by a reverse pharmacophore mapping approach. We validated that the prenyl-flavonoids effectively inhibit FGFR1 using the Mobility Shift Assay, Western blot and molecular dynamics simulations, and the results suggest significant potency of the compounds towards FGFR1. These findings provide a new chemical class with strong links to traditional medicines, possessing reasonable safety for developing potential therapeutic agents for FGFR1-related diseases.
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Affiliation(s)
- Ying Liu
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Pinyi Gao
- College of Pharmaceutical and Biotechnology Engineering, Shenyang University of Chemical Technology, Shenyang, 110142, PR China
| | - Xiao Liang
- College of Pharmacy, Liaoning University, 66 Chongshan Road, Shenyang, 110036, Liaoning, PR China
| | - Yangyang Zhang
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Xiaoqi Yu
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Xiaobian Xue
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Lara Kockaya
- Division of Medicinal Chemistry, Department of BioMolecular Sciences, University of Mississippi, Mississippi, 38677, USA
| | - Pankaj Pandey
- National Center for Natural Products Research, School of Pharmacy, University of Mississippi, Mississippi, 38677, USA
| | - Robert J Doerksen
- Division of Medicinal Chemistry, Department of BioMolecular Sciences, University of Mississippi, Mississippi, 38677, USA
| | - Xiaojuan Wang
- School of Pharmacy, Lanzhou University, Lanzhou, 730000, Gansu, PR China
| | - Guodong Yao
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Wanchun Chu
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Xin Chen
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Shaojiang Song
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Mark T Hamann
- College of Pharmacy & Medicine, Medical University of South Carolina, Charleston, SC, 29425-5700, USA.
| | - Lingzhi Li
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China.
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9
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Zhao JX, Yue JM. Frontier studies on natural products: moving toward paradigm shifts. Sci China Chem 2023. [DOI: 10.1007/s11426-022-1512-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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10
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Gribble GW. Naturally Occurring Organohalogen Compounds-A Comprehensive Review. PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS 2023; 121:1-546. [PMID: 37488466 DOI: 10.1007/978-3-031-26629-4_1] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/26/2023]
Abstract
The present volume is the third in a trilogy that documents naturally occurring organohalogen compounds, bringing the total number-from fewer than 25 in 1968-to approximately 8000 compounds to date. Nearly all of these natural products contain chlorine or bromine, with a few containing iodine and, fewer still, fluorine. Produced by ubiquitous marine (algae, sponges, corals, bryozoa, nudibranchs, fungi, bacteria) and terrestrial organisms (plants, fungi, bacteria, insects, higher animals) and universal abiotic processes (volcanos, forest fires, geothermal events), organohalogens pervade the global ecosystem. Newly identified extraterrestrial sources are also documented. In addition to chemical structures, biological activity, biohalogenation, biodegradation, natural function, and future outlook are presented.
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Affiliation(s)
- Gordon W Gribble
- Department of Chemistry, Dartmouth College, Hanover, NH, 03755, USA.
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11
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Current Perspectives on Pyrroloiminoquinones: Distribution, Biosynthesis and Drug Discovery Potential. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27248724. [PMID: 36557854 PMCID: PMC9787360 DOI: 10.3390/molecules27248724] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 12/04/2022] [Accepted: 12/06/2022] [Indexed: 12/13/2022]
Abstract
Pyrroloiminoquinones are a group of cytotoxic alkaloids most commonly isolated from marine sponges. Structurally, they are based on a tricyclic pyrrolo[4,3,2-de]quinoline core and encompass marine natural products such as makaluvamines, tsitsikammamines and discorhabdins. These diverse compounds are known to exhibit a broad spectrum of biological activities including anticancer, antiplasmodial, antimicrobial, antifungal and antiviral activities as well as the inhibition of several key cellular enzymes. The resurgence of interest in pyrroloiminoquinones and the convoluted understanding regarding their biological activities have prompted this review. Herein, we provided a concise summary of key findings and recent developments pertaining to their structural diversity, distribution, biogenesis, and their potential as chemical probes for drug development, including a discussion of promising synthetic analogs.
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12
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Liu M, Zhang X, Li G. Structural and Biological Insights into the Hot‐spot Marine Natural Products Reported from 2012 to 2021. CHINESE J CHEM 2022. [DOI: 10.1002/cjoc.202200129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mingyu Liu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy Ocean University of China Qingdao 266003 China
- State Key Laboratory of Microbial Technology Shandong University Qingdao 266237 China
| | - Xingwang Zhang
- State Key Laboratory of Microbial Technology Shandong University Qingdao 266237 China
| | - Guoqiang Li
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy Ocean University of China Qingdao 266003 China
- Laboratory of Marine Drugs and Biological Products, National Laboratory for Marine Science and Technology Qingdao 266235 China
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13
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Tilaoui M, Ait Mouse H, Zyad A. Update and New Insights on Future Cancer Drug Candidates From Plant-Based Alkaloids. Front Pharmacol 2021; 12:719694. [PMID: 34975465 PMCID: PMC8716855 DOI: 10.3389/fphar.2021.719694] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 11/23/2021] [Indexed: 02/06/2023] Open
Abstract
Cancer is a complex multifactorial disease that results from alterations in many physiological and biochemical functions. Over the last few decades, it has become clear that cancer cells can acquire multidrug resistance to conventional anticancer drugs, resulting in tumor relapse. Thus, there is a continuous need to discover new and effective anticancer drugs. Natural products from plants have served as a primary source of cancer drugs and continue to provide new plant-derived anticancer drugs. The present review describes plant-based alkaloids, which have been reported as active or potentially active in cancer treatment within the past 4 years (2017-2020), both in preclinical research and/or in clinical trials. In addition, recent insights into the possible molecular mechanism of action of alkaloid prodrugs naturally present in plants are also highlighted.
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Affiliation(s)
- Mounir Tilaoui
- Experimental Oncology and Natural Substances Team, Cellular and Molecular Immuno-pharmacology, Faculty of Sciences and Technology, Sultan Moulay Slimane University, Beni-Mellal, Morocco
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14
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Hanna GS, Choo YM, Harbit R, Paeth H, Wilde S, Mackle J, Verga JU, Wolf BJ, Thomas OP, Croot P, Cray J, Thomas C, Li LZ, Hardiman G, Hu JF, Wang X, Patel D, Schinazi RF, O’Keefe BR, Hamann MT. Contemporary Approaches to the Discovery and Development of Broad-Spectrum Natural Product Prototypes for the Control of Coronaviruses. JOURNAL OF NATURAL PRODUCTS 2021; 84:3001-3007. [PMID: 34677966 PMCID: PMC8547502 DOI: 10.1021/acs.jnatprod.1c00625] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Indexed: 05/25/2023]
Abstract
The pressing need for SARS-CoV-2 controls has led to a reassessment of strategies to identify and develop natural product inhibitors of zoonotic, highly virulent, and rapidly emerging viruses. This review article addresses how contemporary approaches involving computational chemistry, natural product (NP) and protein databases, and mass spectrometry (MS) derived target-ligand interaction analysis can be utilized to expedite the interrogation of NP structures while minimizing the time and expense of extraction, purification, and screening in BioSafety Laboratories (BSL)3 laboratories. The unparalleled structural diversity and complexity of NPs is an extraordinary resource for the discovery and development of broad-spectrum inhibitors of viral genera, including Betacoronavirus, which contains MERS, SARS, SARS-CoV-2, and the common cold. There are two key technological advances that have created unique opportunities for the identification of NP prototypes with greater efficiency: (1) the application of structural databases for NPs and target proteins and (2) the application of modern MS techniques to assess protein-ligand interactions directly from NP extracts. These approaches, developed over years, now allow for the identification and isolation of unique antiviral ligands without the immediate need for BSL3 facilities. Overall, the goal is to improve the success rate of NP-based screening by focusing resources on source materials with a higher likelihood of success, while simultaneously providing opportunities for the discovery of novel ligands to selectively target proteins involved in viral infection.
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Affiliation(s)
- George S. Hanna
- Departments of Drug Discovery and Biomedical Sciences and Public Health, Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston, South Carolina 29425, United States
| | - Yeun-Mun Choo
- Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | - Ryan Harbit
- College of Charleston, Charleston, South Carolina 29425, United States
| | - Heather Paeth
- Departments of Drug Discovery and Biomedical Sciences and Public Health, Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston, South Carolina 29425, United States
| | - Sarah Wilde
- Department of Biology, Clemson University, Clemson, South Carolina 29631, United States
| | - James Mackle
- School of Biological Sciences & Institute for Global Food Security, Queens University, Belfast, Northern Ireland, United Kingdom
| | - Jacopo-Umberto Verga
- School of Biological Sciences & Institute for Global Food Security, Queens University, Belfast, Northern Ireland, United Kingdom
| | - Bethany J. Wolf
- Department of Public Health Sciences, Medical University of South Carolina, Charleston, South Carolina 29425, United States
| | - Olivier P. Thomas
- Marine Biodiscovery, School of Chemistry and Ryan Institute, National University of Ireland Galway, Galway H91Tk33, Ireland
| | - Peter Croot
- Irish Centre for Research in Applied Geoscience, Earth and Ocean Sciences and Ryan Institute, School of Natural Sciences, National University of Ireland, Galway, Galway, Ireland
| | - James Cray
- Department of Biomedical Education and Anatomy, College of Medicine and Division of Biosciences, College of Dentistry, Ohio State University, Columbus, Ohio 43210, United States
| | - Courtney Thomas
- Department of Chemistry, South Carolina State University, Orangeburg, South Carolina, United States
| | - Ling-Zhi Li
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University/SPU, Shenyang, China
| | - Gary Hardiman
- School of Biological Sciences & Institute for Global Food Security, Queens University, Belfast, Northern Ireland, United Kingdom
| | - Jin-Feng Hu
- School of Advanced Study, Zhejiang Provincial Key Laboratory of Plant Ecology and Conservation, Taizhou University, Zhejiang 318000, China
| | - Xiaojuan Wang
- School of Pharmacy, Lanzhou University, Lanzhou, China
| | - Dharmeshkhumar Patel
- Department of Pediatrics, Laboratory of Biochemical Pharmacology, Emory University School of Medicine, and Children’s Healthcare of Atlanta, Atlanta, GA 30322, USA
| | - Raymond F. Schinazi
- Department of Pediatrics, Laboratory of Biochemical Pharmacology, Emory University School of Medicine, and Children’s Healthcare of Atlanta, Atlanta, GA 30322, USA
| | - Barry R. O’Keefe
- Molecular Targets Program, Center for Cancer Research, Natural Products Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, Frederick, Maryland 21702, United States
| | - Mark T. Hamann
- Departments of Drug Discovery and Biomedical Sciences and Public Health, Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston, South Carolina 29425, United States
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15
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de Oliveira MT, Alves JMA, Braga AAC, Wilson DJD, Barboza CA. Do Double-Hybrid Exchange-Correlation Functionals Provide Accurate Chemical Shifts? A Benchmark Assessment for Proton NMR. J Chem Theory Comput 2021; 17:6876-6885. [PMID: 34637284 DOI: 10.1021/acs.jctc.1c00604] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A benchmark density functional theory (DFT) study of 1H NMR chemical shifts for data sets comprising 200 chemical shifts, including complex natural products, has been carried out to assess the performance of DFT methods. Two new benchmark data sets, NMRH33 and NMRH148, have been established. The meta-GGA revTPSS performs remarkably well against the NMRH33 benchmark set (mean absolute deviation (MAD), 0.10 ppm; maximum deviation (max), 0.26 ppm) with the smallest MAD of all evaluated functionals. The best-performing double-hybrid density functional (DHDF), revDSD-BLYP (MAD, 0.16 ppm; max, 0.35 ppm), performs similarly to hybrid-GGA methods (e.g., mPW1PW91/6-311G(d) (MAD, 0.15 ppm; max, 0.36 ppm)), but at a considerably higher computational cost. The results indicate that currently available double-hybrid DFT methods offer no benefit over GGA (including hybrid and meta) functionals in the calculation of 1H NMR chemical shifts.
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Affiliation(s)
- Marcelo T de Oliveira
- Department of Chemistry and Physics, La Trobe Institute of Molecular Sciences, La Trobe University, Melbourne, Victoria 3086, Australia.,Chemistry Institute of São Carlos, University of São Paulo, Avenida Trabalhador São Carlense 400, 13566-590 São Carlos, São Paulo, Brazil
| | - Júlia M A Alves
- Chemistry Institute of São Carlos, University of São Paulo, Avenida Trabalhador São Carlense 400, 13566-590 São Carlos, São Paulo, Brazil
| | - Ataualpa A C Braga
- Instituto de Química, Universidade de São Paulo, Avenida Prof. Lineu Prestes 748, 05508-000 São Paulo, Brazil
| | - David J D Wilson
- Department of Chemistry and Physics, La Trobe Institute of Molecular Sciences, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Cristina A Barboza
- Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, Warsaw 02-668, Poland
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16
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Xiong J, Zhou PJ, Jiang HW, Huang T, He YH, Zhao ZY, Zang Y, Choo YM, Wang X, Chittiboyina AG, Pandey P, Hamann MT, Li J, Hu JF. Forrestiacids A and B, Pentaterpene Inhibitors of ACL and Lipogenesis: Extending the Limits of Computational NMR Methods in the Structure Assignment of Complex Natural Products. Angew Chem Int Ed Engl 2021; 60:22270-22275. [PMID: 34374477 PMCID: PMC11173361 DOI: 10.1002/anie.202109082] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Indexed: 12/30/2022]
Abstract
Forrestiacids A (1) and B (2) are a novel class of [4+2] type pentaterpenoids derived from a rearranged lanostane moiety (dienophile) and an abietane unit (diene). These unprecedented molecules were isolated using guidance by molecular ion networking (MoIN) from Pseudotsuga forrestii, an endangered member of the Asian Douglas Fir Family. The intermolecular hetero-Diels-Alder adducts feature an unusual bicyclo[2.2.2]octene ring system. Their structures were elucidated by spectroscopic analysis, GIAO NMR calculations and DP4+ probability analyses, electronic circular dichroism calculations, and X-ray diffraction analysis. This unique addition to the pentaterpene family represents the largest and the most complex molecule successfully assigned using computational approaches to predict accurately chemical shift values. Compounds 1 and 2 exhibited potent inhibitory activities (IC50 s <5 μM) of ATP-citrate lyase (ACL), a new drug target for the treatment of glycolipid metabolic disorders including hyperlipidemia. Validating this activity 1 effectively attenuated the de novo lipogenesis in HepG2 cells. These findings provide a new chemical class for developing potential therapeutic agents for ACL-related diseases with strong links to traditional medicines.
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Affiliation(s)
- Juan Xiong
- School of Pharmacy, Fudan University, Shanghai, 201203, P. R. China
| | - Peng-Jun Zhou
- School of Pharmacy, Fudan University, Shanghai, 201203, P. R. China
| | - Hao-Wen Jiang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, P. R. China
| | - Ting Huang
- School of Pharmacy, Fudan University, Shanghai, 201203, P. R. China
| | - Yu-Hang He
- School of Pharmacy, Fudan University, Shanghai, 201203, P. R. China
| | - Ze-Yu Zhao
- School of Pharmacy, Fudan University, Shanghai, 201203, P. R. China
| | - Yi Zang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, P. R. China
| | - Yeun-Mun Choo
- Chemistry Department, Faculty of Science, University of Malaya, Kuala Lumpur, 50603, Malaysia
| | - Xiaojuan Wang
- School of Pharmacy, Lanzhou University, Lanzhou, 730000, Gansu, P. R. China
| | - Amar G Chittiboyina
- National Center for Natural Products Research, University of Mississippi, Oxford, MS, 38677, USA
| | - Pankaj Pandey
- National Center for Natural Products Research, University of Mississippi, Oxford, MS, 38677, USA
| | - Mark T Hamann
- Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston, SC, 29425-5700, USA
| | - Jia Li
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, P. R. China
| | - Jin-Feng Hu
- School of Pharmacy, Fudan University, Shanghai, 201203, P. R. China
- School of Advanced Study, Taizhou University, Taizhou, 318000, Zhejiang, P. R. China
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17
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Forrestiacids A and B, Pentaterpene Inhibitors of ACL and Lipogenesis: Extending the Limits of Computational NMR Methods in the Structure Assignment of Complex Natural Products. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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18
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Seipp K, Geske L, Opatz T. Marine Pyrrole Alkaloids. Mar Drugs 2021; 19:514. [PMID: 34564176 PMCID: PMC8471394 DOI: 10.3390/md19090514] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 09/05/2021] [Accepted: 09/07/2021] [Indexed: 12/13/2022] Open
Abstract
Nitrogen heterocycles are essential parts of the chemical machinery of life and often reveal intriguing structures. They are not only widespread in terrestrial habitats but can also frequently be found as natural products in the marine environment. This review highlights the important class of marine pyrrole alkaloids, well-known for their diverse biological activities. A broad overview of the marine pyrrole alkaloids with a focus on their isolation, biological activities, chemical synthesis, and derivatization covering the decade from 2010 to 2020 is provided. With relevant structural subclasses categorized, this review shall provide a clear and timely synopsis of this area.
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Affiliation(s)
| | | | - Till Opatz
- Department of Chemistry, Organic Chemistry Section, Johannes Gutenberg University, Duesbergweg 10–14, 55128 Mainz, Germany; (K.S.); (L.G.)
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19
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He Q, Wu Z, Li L, Sun W, Wang G, Jiang R, Hu L, Shi L, He R, Wang Y, Ye W. Discovery of Neuritogenic
Securinega
Alkaloids from
Flueggea suffruticosa
by a Building Blocks‐Based Molecular Network Strategy. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202103878] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Qi‐Fang He
- Center for Bioactive Natural Molecules and Innovative Drugs Research College of Pharmacy Jinan University Guangzhou 510632 China
| | - Zhen‐Long Wu
- Center for Bioactive Natural Molecules and Innovative Drugs Research College of Pharmacy Jinan University Guangzhou 510632 China
| | - Liuren Li
- Center for Bioactive Natural Molecules and Innovative Drugs Research College of Pharmacy Jinan University Guangzhou 510632 China
| | - Wan‐Yang Sun
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research Jinan University Guangzhou 510632 China
| | - Gui‐Yang Wang
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research Jinan University Guangzhou 510632 China
| | - Ren‐Wang Jiang
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research Jinan University Guangzhou 510632 China
| | - Li‐Jun Hu
- Center for Bioactive Natural Molecules and Innovative Drugs Research College of Pharmacy Jinan University Guangzhou 510632 China
| | - Lei Shi
- Center for Bioactive Natural Molecules and Innovative Drugs Research College of Pharmacy Jinan University Guangzhou 510632 China
| | - Rong‐Rong He
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research Jinan University Guangzhou 510632 China
| | - Ying Wang
- Center for Bioactive Natural Molecules and Innovative Drugs Research College of Pharmacy Jinan University Guangzhou 510632 China
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research Jinan University Guangzhou 510632 China
| | - Wen‐Cai Ye
- Center for Bioactive Natural Molecules and Innovative Drugs Research College of Pharmacy Jinan University Guangzhou 510632 China
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research Jinan University Guangzhou 510632 China
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20
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He QF, Wu ZL, Li L, Sun WY, Wang GY, Jiang RW, Hu LJ, Shi L, He RR, Wang Y, Ye WC. Discovery of Neuritogenic Securinega Alkaloids from Flueggea suffruticosa by a Building Blocks-Based Molecular Network Strategy. Angew Chem Int Ed Engl 2021; 60:19609-19613. [PMID: 34196083 DOI: 10.1002/anie.202103878] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 06/28/2021] [Indexed: 12/22/2022]
Abstract
A combined strategy of building blocks recognition and molecular network construction, termed the building blocks-based molecular network (BBMN), was first presented to facilitate the efficient discovery of novel natural products. By mapping the BBMN of the total alkaloid fraction of Flueggea suffruticosa, three Securinega alkaloids (SEAs) with unusual chemical architectures, suffranidines A-C (1-3), were discovered and isolated. Compound 1 characterizes an unprecedented 8/5/6/5/6/6/6/6-fused octacyclic scaffold with a unique cage-shaped 3-azatricyclo[6.4.0.03,11 ]dodecane core. Compounds 2 and 3 are highly modified SEA dimers that incorporate additional C6 motifs. A hypothetical biosynthetic pathway for 1-3 was proposed. In addition, 1 significantly induced neuronal differentiation and neurite extension by upregulating eukaryotic elongation factor 2 (eEF2)-mediated protein synthesis.
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Affiliation(s)
- Qi-Fang He
- Center for Bioactive Natural Molecules and Innovative Drugs Research, College of Pharmacy, Jinan University, Guangzhou, 510632, China
| | - Zhen-Long Wu
- Center for Bioactive Natural Molecules and Innovative Drugs Research, College of Pharmacy, Jinan University, Guangzhou, 510632, China
| | - Liuren Li
- Center for Bioactive Natural Molecules and Innovative Drugs Research, College of Pharmacy, Jinan University, Guangzhou, 510632, China
| | - Wan-Yang Sun
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research, Jinan University, Guangzhou, 510632, China
| | - Gui-Yang Wang
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research, Jinan University, Guangzhou, 510632, China
| | - Ren-Wang Jiang
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research, Jinan University, Guangzhou, 510632, China
| | - Li-Jun Hu
- Center for Bioactive Natural Molecules and Innovative Drugs Research, College of Pharmacy, Jinan University, Guangzhou, 510632, China
| | - Lei Shi
- Center for Bioactive Natural Molecules and Innovative Drugs Research, College of Pharmacy, Jinan University, Guangzhou, 510632, China
| | - Rong-Rong He
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research, Jinan University, Guangzhou, 510632, China
| | - Ying Wang
- Center for Bioactive Natural Molecules and Innovative Drugs Research, College of Pharmacy, Jinan University, Guangzhou, 510632, China.,Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research, Jinan University, Guangzhou, 510632, China
| | - Wen-Cai Ye
- Center for Bioactive Natural Molecules and Innovative Drugs Research, College of Pharmacy, Jinan University, Guangzhou, 510632, China.,Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research, Jinan University, Guangzhou, 510632, China
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21
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Marcarino MO, Cicetti S, Zanardi MM, Sarotti AM. A critical review on the use of DP4+ in the structural elucidation of natural products: the good, the bad and the ugly. A practical guide. Nat Prod Rep 2021; 39:58-76. [PMID: 34212963 DOI: 10.1039/d1np00030f] [Citation(s) in RCA: 71] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Covering: 2015 up to the end of 2020Even in the golden age of NMR, the number of natural products being incorrectly assigned is becoming larger every day. The use of quantum NMR calculations coupled with sophisticated data analysis provides ideal complementary tools to facilitate the elucidation process in challenging cases. Among the current computational methodologies to perform this task, the DP4+ probability is a popular and widely used method. This updated version of Goodman's DP4 synergistically combines NMR calculations at higher levels of theory with the Bayesian analysis of both scaled and unscaled data. Since its publication in late 2015, the use of DP4+ to solve controversial natural products has substantially grown, with several predictions being confirmed by total synthesis. To date, the structures of more than 200 natural products were determined with the aid of DP4+. However, all that glitters is not gold. Besides its intrinsic limitations, on many occasions it has been improperly used with potentially important consequences on the quality of the assignment. Herein we present a critical revision on how the scientific community has been using DP4+, exploring the strengths of the method and how to obtain optimal results from it. We also analyze the weaknesses of DP4+, and the paths to by-pass them to maximize the confidence in the structural elucidation.
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Affiliation(s)
- Maribel O Marcarino
- Instituto de Química Rosario (CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, Rosario 2000, Argentina.
| | - Soledad Cicetti
- Instituto de Química Rosario (CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, Rosario 2000, Argentina.
| | - María M Zanardi
- Instituto de Ingeniería Ambiental, Química y Biotecnología Aplicada (INGEBIO), Facultad de Química e Ingeniería del Rosario, Pontificia Universidad Católica Argentina, Av. Pellegrini 3314, Rosario 2000, Argentina.
| | - Ariel M Sarotti
- Instituto de Química Rosario (CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, Rosario 2000, Argentina.
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22
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Zanardi MM, Sarotti AM. Sensitivity Analysis of DP4+ with the Probability Distribution Terms: Development of a Universal and Customizable Method. J Org Chem 2021; 86:8544-8548. [DOI: 10.1021/acs.joc.1c00987] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- María Marta Zanardi
- Instituto de Ingeniería Ambiental, Química y Biotecnología Aplicada (INGEBIO), Facultad de Química e Ingeniería del Rosario, Pontificia Universidad Católica Argentina, S2002QEO Rosario, Argentina
| | - Ariel M. Sarotti
- Instituto de Química Rosario (CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, 2000 Rosario, Argentina
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23
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Zhang F, Niu Y, Hong D, Ye Y, Hua Y, Ding S, Zhang Y. Synthetic studies towards atkamine. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2020.06.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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24
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Kalinski JCJ, Krause RWM, Parker-Nance S, Waterworth SC, Dorrington RA. Unlocking the Diversity of Pyrroloiminoquinones Produced by Latrunculid Sponge Species. Mar Drugs 2021; 19:md19020068. [PMID: 33525412 PMCID: PMC7912287 DOI: 10.3390/md19020068] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 01/12/2021] [Accepted: 01/18/2021] [Indexed: 12/28/2022] Open
Abstract
Sponges of the Latrunculiidae family produce bioactive pyrroloiminoquinone alkaloids including makaluvamines, discorhabdins, and tsitsikammamines. The aim of this study was to use LC-ESI-MS/MS-driven molecular networking to characterize the pyrroloiminoquinone secondary metabolites produced by six latrunculid species. These are Tsitsikamma favus, Tsitsikamma pedunculata, Cyclacanthia bellae, and Latrunculia apicalis as well as the recently discovered species, Tsitsikamma nguni and Tsitsikamma michaeli. Organic extracts of 43 sponges were analyzed, revealing distinct species-specific chemical profiles. More than 200 known and unknown putative pyrroloiminoquinones and related compounds were detected, including unprecedented makaluvamine-discorhabdin adducts and hydroxylated discorhabdin I derivatives. The chemical profiles of the new species T. nguni closely resembled those of the known T. favus (chemotype I), but with a higher abundance of tsitsikammamines vs. discorhabdins. T. michaeli sponges displayed two distinct chemical profiles, either producing mostly the same discorhabdins as T. favus (chemotype I) or non- or monobrominated, hydroxylated discorhabdins. C. bellae and L. apicalis produced similar pyrroloiminoquinone chemistry to one another, characterized by sulfur-containing discorhabdins and related adducts and oligomers. This study highlights the variability of pyrroloiminoquinone production by latrunculid species, identifies novel isolation targets, and offers fundamental insights into the collision-induced dissociation of pyrroloiminoquinones.
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Affiliation(s)
- Jarmo-Charles J. Kalinski
- Department of Biochemistry and Microbiology, Rhodes University, Makhanda 6140, South Africa; (J.-C.J.K.); (S.P.-N.); (S.C.W.)
| | - Rui W. M. Krause
- Department of Chemistry, Rhodes University, Makhanda 6140, South Africa;
| | - Shirley Parker-Nance
- Department of Biochemistry and Microbiology, Rhodes University, Makhanda 6140, South Africa; (J.-C.J.K.); (S.P.-N.); (S.C.W.)
- South African Environmental Observation Network, Elwandle Coastal Node, Port Elizabeth 6001, South Africa
- South African Institute for Aquatic Biodiversity, Makhanda 6140, South Africa
| | - Samantha C. Waterworth
- Department of Biochemistry and Microbiology, Rhodes University, Makhanda 6140, South Africa; (J.-C.J.K.); (S.P.-N.); (S.C.W.)
- Division of Pharmaceutical Sciences, University of Wisconsin, Madison, WI 53705, USA
| | - Rosemary A. Dorrington
- Department of Biochemistry and Microbiology, Rhodes University, Makhanda 6140, South Africa; (J.-C.J.K.); (S.P.-N.); (S.C.W.)
- South African Institute for Aquatic Biodiversity, Makhanda 6140, South Africa
- Correspondence:
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25
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Li F, Kelly M, Tasdemir D. Chemistry, Chemotaxonomy and Biological Activity of the Latrunculid Sponges (Order Poecilosclerida, Family Latrunculiidae). Mar Drugs 2021; 19:27. [PMID: 33435402 PMCID: PMC7827931 DOI: 10.3390/md19010027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 12/21/2020] [Accepted: 12/27/2020] [Indexed: 02/06/2023] Open
Abstract
Marine sponges are exceptionally prolific sources of natural products for the discovery and development of new drugs. Until now, sponges have contributed around 30% of all natural metabolites isolated from the marine environment. Family Latrunculiidae Topsent, 1922 (class Demospongiae Sollas, 1885, order Poecilosclerida Topsent, 1928) is a small sponge family comprising seven genera. Latrunculid sponges are recognized as the major reservoirs of diverse types of pyrroloiminoquinone-type alkaloids, with a myriad of biological activities, in particular, cytotoxicity, fuelling their exploration for anticancer drug discovery. Almost 100 pyrroloiminoquinone alkaloids and their structurally related compounds have been reported from the family Latrunculiidae. The systematics of latrunculid sponges has had a complex history, however it is now well understood. The pyrroloiminoquinone alkaloids have provided important chemotaxonomic characters for this sponge family. Latrunculid sponges have been reported to contain other types of metabolites, such as peptides (callipeltins), norditerpenes and norsesterpenes (trunculins) and macrolides (latrunculins), however, the sponges containing latrunculins and trunculins have been transferred to other sponge families. This review highlights a comprehensive literature survey spanning from the first chemical investigation of a New Zealand Latrunculia sp. in 1986 until August 2020, focusing on the chemical diversity and biological activities of secondary metabolites reported from the family Latrunculiidae. The biosynthetic (microbial) origin and the taxonomic significance of pyrroloiminoquinone related alkaloids are also discussed.
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Affiliation(s)
- Fengjie Li
- GEOMAR Centre for Marine Biotechnology (GEOMAR-Biotech), Research Unit Marine Natural Products Chemistry, GEOMAR Helmholtz Centre for Ocean Research Kiel, Am Kiel-Kanal 44, 24106 Kiel, Germany;
| | - Michelle Kelly
- Coast and Oceans National Centre, National Institute of Water and Atmospheric Research (NIWA) Ltd., P.O. Box 109-695, Newmarket, Auckland 1149, New Zealand;
| | - Deniz Tasdemir
- GEOMAR Centre for Marine Biotechnology (GEOMAR-Biotech), Research Unit Marine Natural Products Chemistry, GEOMAR Helmholtz Centre for Ocean Research Kiel, Am Kiel-Kanal 44, 24106 Kiel, Germany;
- Faculty of Mathematics and Natural Sciences, Kiel University, Christian-Albrechts-Platz 4, 24118 Kiel, Germany
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Carroll AR, Copp BR, Davis RA, Keyzers RA, Prinsep MR. Marine natural products. Nat Prod Rep 2021; 38:362-413. [PMID: 33570537 DOI: 10.1039/d0np00089b] [Citation(s) in RCA: 198] [Impact Index Per Article: 66.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This review covers the literature published in 2019 for marine natural products (MNPs), with 719 citations (701 for the period January to December 2019) referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, cnidarians, bryozoans, molluscs, tunicates, echinoderms, mangroves and other intertidal plants and microorganisms. The emphasis is on new compounds (1490 in 440 papers for 2019), together with the relevant biological activities, source organisms and country of origin. Pertinent reviews, biosynthetic studies, first syntheses, and syntheses that led to the revision of structures or stereochemistries, have been included. Methods used to study marine fungi and their chemical diversity have also been discussed.
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Affiliation(s)
- Anthony R Carroll
- School of Environment and Science, Griffith University, Gold Coast, Australia. and Griffith Institute for Drug Discovery, Griffith University, Brisbane, Australia
| | - Brent R Copp
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| | - Rohan A Davis
- Griffith Institute for Drug Discovery, Griffith University, Brisbane, Australia and School of Enivironment and Science, Griffith University, Brisbane, Australia
| | - Robert A Keyzers
- Centre for Biodiscovery, School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
| | - Michèle R Prinsep
- Chemistry, School of Science, University of Waikato, Hamilton, New Zealand
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Li HT, Duan RT, Liu T, Yang RN, Wang JP, Liu SX, Yang YB, Zhou H, Ding ZT. Penctrimertone, a bioactive citrinin dimer from the endophytic fungus Penicillium sp. T2-11. Fitoterapia 2020; 146:104711. [DOI: 10.1016/j.fitote.2020.104711] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 08/18/2020] [Accepted: 08/19/2020] [Indexed: 12/17/2022]
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Fu Y, Schneider J. Towards Knowledge Maintenance in Scientific Digital Libraries with the Keystone Framework. PROCEEDINGS OF THE ... ACM/IEEE JOINT CONFERENCE ON DIGITAL LIBRARIES. ACM/IEEE JOINT CONFERENCE ON DIGITAL LIBRARIES 2020; 2020:217-226. [PMID: 34305485 DOI: 10.1145/3383583.3398514] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Scientific digital libraries speed dissemination of scientific publications, but also the propagation of invalid or unreliable knowledge. Although many papers with known validity problems are highly cited, no auditing process is currently available to determine whether a citing paper's findings fundamentally depend on invalid or unreliable knowledge. To address this, we introduce a new framework, the keystone framework, designed to identify when and how citing unreliable findings impacts a paper, using argumentation theory and citation context analysis. Through two pilot case studies, we demonstrate how the keystone framework can be applied to knowledge maintenance tasks for digital libraries, including addressing citations of a non-reproducible paper and identifying statements most needing validation in a high-impact paper. We identify roles for librarians, database maintainers, knowledgebase curators, and research software engineers in applying the framework to scientific digital libraries.
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Affiliation(s)
- Yuanxi Fu
- School of Information Sciences, University of Illinois at Urbana-Champaign, Champaign, IL USA
| | - Jodi Schneider
- School of Information Sciences, University of Illinois at Urbana-Champaign, Champaign, IL USA
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Exploration of the Electrophilic Reactivity of the Cytotoxic Marine Alkaloid Discorhabdin C and Subsequent Discovery of a New Dimeric C-1/N-13-Linked Discorhabdin Natural Product. Mar Drugs 2020; 18:md18080404. [PMID: 32752009 PMCID: PMC7460216 DOI: 10.3390/md18080404] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 07/24/2020] [Accepted: 07/28/2020] [Indexed: 12/20/2022] Open
Abstract
The cytotoxic marine natural product discorhabdin C contains a 2,6-dibromo-cyclohexa-2,5-diene moiety, previously proposed to be a critical feature required for biological activity. We have determined that the dienone-ring of discorhabdin C is indeed electrophilic, reacting with thiol and amine nucleophiles, affording debrominated adducts. In the case of reaction with 1-aminopentane the product contains an unusual C-2/N-18 ring closed, double-hydrate moiety. This electrophilic reactivity also extends to proteins, with lysozyme-discorhabdin C adducts being detected by ESI mass spectrometry. These results prompted further examination of an extract of discorhabdin C-producing sponge, Latrunculia (Latrunculia) trivetricillata, leading to the isolation and characterisation of a new example of a C-1/N-13 linked discorhabdin dimer that shared structural similarities with the 1-aminopentane-discorhabdin C adduct. To definitively assess the influence of the dienone moiety of discorhabdin C on cytotoxicity, a semi-synthetic hydrogenation derivative was prepared, affording a didebrominated ring-closed carbinolamine that was essentially devoid of tumour cell line cytotoxicity. Antiparasitic activity was assessed for a set of 14 discorhabdin alkaloids composed of natural products and semi-synthetic derivatives. Three compounds, (-)-discorhabdin L, a dimer of discorhabdin B and the discorhabdin C hydrogenation carbinolamine, exhibited pronounced activity towards Plasmodium falciparum K1 (IC50 30–90 nM) with acceptable to excellent selectivity (selectivity index 19–510) versus a non-malignant cell line.
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Targeted Isolation of Rubrolides from the New Zealand Marine Tunicate Synoicum kuranui. Mar Drugs 2020; 18:md18070337. [PMID: 32605132 PMCID: PMC7401252 DOI: 10.3390/md18070337] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 06/22/2020] [Accepted: 06/23/2020] [Indexed: 12/21/2022] Open
Abstract
Global natural products social (GNPS) molecular networking is a useful tool to categorize chemical space within samples and streamline the discovery of new natural products. Here, we demonstrate its use in chemically profiling the extract of the marine tunicate Synoicum kuranui, comprised of many previously reported rubrolides, for new chemical entities. Within the rubrolide cluster, two masses that did not correspond to previously reported congeners were detected, and, following MS-guided fractionation, led to the isolation of new methylated rubrolides T (3) and (Z/E)–U (4). Both compounds showed strong growth inhibitory activity against the Gram-positive bacteria Bacillus subtilis, with minimum inhibitory concentration (MIC) values of 0.41 and 0.91 μM, respectively.
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31
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Aron AT, Gentry EC, McPhail KL, Nothias LF, Nothias-Esposito M, Bouslimani A, Petras D, Gauglitz JM, Sikora N, Vargas F, van der Hooft JJJ, Ernst M, Kang KB, Aceves CM, Caraballo-Rodríguez AM, Koester I, Weldon KC, Bertrand S, Roullier C, Sun K, Tehan RM, Boya P CA, Christian MH, Gutiérrez M, Ulloa AM, Tejeda Mora JA, Mojica-Flores R, Lakey-Beitia J, Vásquez-Chaves V, Zhang Y, Calderón AI, Tayler N, Keyzers RA, Tugizimana F, Ndlovu N, Aksenov AA, Jarmusch AK, Schmid R, Truman AW, Bandeira N, Wang M, Dorrestein PC. Reproducible molecular networking of untargeted mass spectrometry data using GNPS. Nat Protoc 2020; 15:1954-1991. [PMID: 32405051 DOI: 10.1038/s41596-020-0317-5] [Citation(s) in RCA: 290] [Impact Index Per Article: 72.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 03/03/2020] [Indexed: 02/06/2023]
Abstract
Global Natural Product Social Molecular Networking (GNPS) is an interactive online small molecule-focused tandem mass spectrometry (MS2) data curation and analysis infrastructure. It is intended to provide as much chemical insight as possible into an untargeted MS2 dataset and to connect this chemical insight to the user's underlying biological questions. This can be performed within one liquid chromatography (LC)-MS2 experiment or at the repository scale. GNPS-MassIVE is a public data repository for untargeted MS2 data with sample information (metadata) and annotated MS2 spectra. These publicly accessible data can be annotated and updated with the GNPS infrastructure keeping a continuous record of all changes. This knowledge is disseminated across all public data; it is a living dataset. Molecular networking-one of the main analysis tools used within the GNPS platform-creates a structured data table that reflects the molecular diversity captured in tandem mass spectrometry experiments by computing the relationships of the MS2 spectra as spectral similarity. This protocol provides step-by-step instructions for creating reproducible, high-quality molecular networks. For training purposes, the reader is led through a 90- to 120-min procedure that starts by recalling an example public dataset and its sample information and proceeds to creating and interpreting a molecular network. Each data analysis job can be shared or cloned to disseminate the knowledge gained, thus propagating information that can lead to the discovery of molecules, metabolic pathways, and ecosystem/community interactions.
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Affiliation(s)
- Allegra T Aron
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | - Emily C Gentry
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | - Kerry L McPhail
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University, Corvallis, OR, USA
| | - Louis-Félix Nothias
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | - Mélissa Nothias-Esposito
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | - Amina Bouslimani
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | - Daniel Petras
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
| | - Julia M Gauglitz
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | - Nicole Sikora
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | - Fernando Vargas
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
- Division of Biological Sciences, University of California San Diego, La Jolla, CA, USA
| | | | - Madeleine Ernst
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | - Kyo Bin Kang
- College of Pharmacy, Sookmyung Women's University, Seoul, Korea
| | - Christine M Aceves
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | | | - Irina Koester
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
| | - Kelly C Weldon
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
- Center of Microbiome Innovation, University of California San Diego, La Jolla, CA, USA
| | - Samuel Bertrand
- Groupe Mer, Molécules, Santé-EA 2160, UFR des Sciences Pharmaceutiques et Biologiques, Université de Nantes, Nantes, France
- ThalassOMICS Metabolomics Facility, Plateforme Corsaire, Biogenouest, Nantes, France
| | - Catherine Roullier
- College of Pharmacy, Sookmyung Women's University, Seoul, Korea
- ThalassOMICS Metabolomics Facility, Plateforme Corsaire, Biogenouest, Nantes, France
| | - Kunyang Sun
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | - Richard M Tehan
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University, Corvallis, OR, USA
| | - Cristopher A Boya P
- Centro de Biodiversidad y Descubrimiento de Drogas, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panama City, Panama
- Department of Biotechnology, Acharya Nagarjuna University, Guntur, Nagarjuna Nagar, India
| | - Martin H Christian
- Centro de Biodiversidad y Descubrimiento de Drogas, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panama City, Panama
| | - Marcelino Gutiérrez
- Centro de Biodiversidad y Descubrimiento de Drogas, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panama City, Panama
| | | | | | - Randy Mojica-Flores
- Centro de Biodiversidad y Descubrimiento de Drogas, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panama City, Panama
- Departamento de Química, Universidad Autónoma de Chiriquí (UNACHI), David, Chiriquí, Panama
| | - Johant Lakey-Beitia
- Centro de Biodiversidad y Descubrimiento de Drogas, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panama City, Panama
| | - Victor Vásquez-Chaves
- Centro de Investigaciones en Productos Naturales (CIPRONA), Universidad de Costa Rica, San José, Costa Rica
| | - Yilue Zhang
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, USA
| | - Angela I Calderón
- Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, AL, USA
| | - Nicole Tayler
- Centro de Biodiversidad y Descubrimiento de Drogas, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panama City, Panama
- Department of Biotechnology, Acharya Nagarjuna University, Guntur, Nagarjuna Nagar, India
| | - Robert A Keyzers
- School of Chemical & Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
| | - Fidele Tugizimana
- Centre for Plant Metabolomics Research, Department of Biochemistry, University of Johannesburg, Auckland Park, South Africa
- International R&D Division, Omnia Group (Pty) Ltd., Johannesburg, South Africa
| | - Nombuso Ndlovu
- Centre for Plant Metabolomics Research, Department of Biochemistry, University of Johannesburg, Auckland Park, South Africa
| | - Alexander A Aksenov
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | - Alan K Jarmusch
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | - Robin Schmid
- Institute of Inorganic and Analytical Chemistry, University of Münster, Münster, Germany
| | - Andrew W Truman
- Department of Molecular Microbiology, John Innes Centre, Norwich, UK
| | - Nuno Bandeira
- Department of Computer Science and Engineering, University of California, San Diego, La Jolla, CA, USA.
| | - Mingxun Wang
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA.
| | - Pieter C Dorrestein
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA.
- Center for Computational Mass Spectrometry, University of California, San Diego, La Jolla, CA, USA.
- Department of Pharmacology, University of California, San Diego, La Jolla, CA, USA.
- Department of Pediatrics, University of California, San Diego, La Jolla, CA, USA.
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Zang Y, Gong Y, Gong J, Liu J, Chen C, Gu L, Zhou Y, Wang J, Zhu H, Zhang Y. Fungal Polyketides with Three Distinctive Ring Skeletons from the Fungus Penicillium canescens Uncovered by OSMAC and Molecular Networking Strategies. J Org Chem 2020; 85:4973-4980. [DOI: 10.1021/acs.joc.0c00147] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Yi Zang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Yihua Gong
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Jiaojiao Gong
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Junjun Liu
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Chunmei Chen
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Lianghu Gu
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Yuan Zhou
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Jianping Wang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Hucheng Zhu
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Yonghui Zhang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
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Li F, Janussen D, Tasdemir D. New Discorhabdin B Dimers with Anticancer Activity from the Antarctic Deep-Sea Sponge Latrunculia biformis. Mar Drugs 2020; 18:md18020107. [PMID: 32054048 PMCID: PMC7074271 DOI: 10.3390/md18020107] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 02/05/2020] [Accepted: 02/07/2020] [Indexed: 12/25/2022] Open
Abstract
Latrunculia sponges represent a rich source of discorhabdin-type pyrroloiminoquinone alkaloids, a few of which comprise a dimeric structure. The anticancer-activity-guided isolation of the n-hexane subextract of the Antarctic deep-sea sponge Latrunculia biformis yielded the known compound (-)-(1R,2R,6R,8S,6'S)-discorhabdin B dimer (1) and two new derivatives, (-)-(1S,2R,6R,8S,6'S)-discorhabdin B dimer (2) and (-)-(1R,2R,6R,8S,6'S)-16',17'-dehydrodiscorhabdin B dimer (3). The chemical structures of compounds 1-3 were elucidated by means of HR-ESIMS, NMR, [], ECD spectroscopy, and a comparison with the previously reported discorhabdin analogs. Compounds 1 and 2 showed significant in vitro anticancer activity against the human colon cancer cell line (HCT-116), with IC50 values of 0.16 and 2.01 µM, respectively. Compared to monomeric discorhabdins, dimeric discorhabdins are very rare in Nature. This study adds two new discorhabdin dimers (2 and 3) to this small pyrroloiminoquinone subfamily. This is also the first report of compound 1 as a natural product and the first assessment of its in vitro anticancer activity.
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Affiliation(s)
- Fengjie Li
- GEOMAR Centre for Marine Biotechnology (GEOMAR-Biotech), Research Unit Marine Natural Products Chemistry, GEOMAR Helmholtz Centre for Ocean Research Kiel, Am Kiel-Kanal 44, 24106 Kiel, Germany;
| | - Dorte Janussen
- Senckenberg Research Institute and Natural History Museum, Senckenberganlage 25, D-60325 Frankfurt, Germany;
| | - Deniz Tasdemir
- GEOMAR Centre for Marine Biotechnology (GEOMAR-Biotech), Research Unit Marine Natural Products Chemistry, GEOMAR Helmholtz Centre for Ocean Research Kiel, Am Kiel-Kanal 44, 24106 Kiel, Germany;
- Faculty of Mathematics and Natural Sciences, Kiel University, Christian-Albrechts-Platz 4, 24118 Kiel, Germany
- Correspondence: ; Tel.: +49-431-600-4430
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McCauley EP, Smith GC, Crews P. Unraveling Structures Containing Highly Conjugated Pyrrolo[4,3,2- de]quinoline Cores That Are Deficient in Diagnostic Proton NMR Signals. JOURNAL OF NATURAL PRODUCTS 2020; 83:174-178. [PMID: 31904956 DOI: 10.1021/acs.jnatprod.9b01111] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
This study began with the goal of identifying additional constituents from Zyzzya fuliginosa extracts obtained from an Indo-Pacific sponge (coll. no. 06132). The previous work identified several red and green pyrroloiminiquinones (aka pyrrolo[4,3,2-de]quinolines), and this reinvestigation provided two additional analogues, a blue compound named zyzzamine A (1) and a green compound named zyzzamine B (2). The relatively low ratio of H/[sum(CNO)] = 0.71 or 0.76 of this pair greatly complicated the final steps of compound characterization and required the use of five 2D NMR strategies and MS2 data sets.
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Affiliation(s)
- Erin P McCauley
- Department of Chemistry and Biochemistry , University of California Santa Cruz , Santa Cruz , California 95064 , United States
| | - Gavin C Smith
- Department of Chemistry and Biochemistry , University of California Santa Cruz , Santa Cruz , California 95064 , United States
| | - Phillip Crews
- Department of Chemistry and Biochemistry , University of California Santa Cruz , Santa Cruz , California 95064 , United States
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35
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Xian L, Xu F, Liu J, Xu N, Li H, Ge H, Shao K, Fan J, Xiao G, Peng X. MicroRNA Detection with Turnover Amplification via Hybridization-Mediated Staudinger Reduction for Pancreatic Cancer Diagnosis. J Am Chem Soc 2019; 141:20490-20497. [PMID: 31774664 DOI: 10.1021/jacs.9b11272] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The occurrence of and development in the early pathological stage of pancreatic cancer has proved to be associated with microRNAs. However, it remains a great challenge to directly monitor low-expression, and downregulation of, microRNA among living cells, tissues, and serum samples. In this work, Staudinger reduction is first applied in intracellular microRNA detection, establishing a set of smart hybridization-mediated Staudinger reduction probes (HMSR-probe) which contain designed oligonucleotide sequences. Meanwhile, 40 serum samples (healthy people (6), patients with pancreatitis (22), and pancreatic cancer patients (12)) are tested for exploring the potential clinical application. Of note, the molecules bound to nucleic acid confine the reactive site to close proximity in a compact space, and nonconnected product from Staudinger reaction facilitates turnover amplification to an ameliorative detection limit (1.3 × 10-15 M). Moreover, compared with qRT-PCR, a low false positive signal and an excellent specificity makes the probe more suitable and convenient for pancreatic cancer diagnosis in blood samples. For practical applications, HMSR-probe enable accurate differentiation in cell and tissue samples under both 488 and 785 nm and have good coherence to known research. As a proof of concept, the reliable results in distinguishing pancreatic cancer patients from different morbid stages might supply a feasible method for endogenous microRNA detection in fundamental research and clinical diagnostics.
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Affiliation(s)
- Liman Xian
- State Key Laboratory of Fine Chemicals , Dalian University of Technology , 2 Linggong Road , High-tech District, Dalian 116024 , PR China
| | - Feng Xu
- State Key Laboratory of Fine Chemicals , Dalian University of Technology , 2 Linggong Road , High-tech District, Dalian 116024 , PR China
| | - Jianzhou Liu
- School of Pharmaceutical Science and Technology , Dalian University of Technology , 2 Linggong Road , High-tech District, Dalian 116024 , PR China
| | - Ning Xu
- State Key Laboratory of Fine Chemicals , Dalian University of Technology , 2 Linggong Road , High-tech District, Dalian 116024 , PR China
| | - Haidong Li
- State Key Laboratory of Fine Chemicals , Dalian University of Technology , 2 Linggong Road , High-tech District, Dalian 116024 , PR China
| | - Haoying Ge
- State Key Laboratory of Fine Chemicals , Dalian University of Technology , 2 Linggong Road , High-tech District, Dalian 116024 , PR China
| | - Kun Shao
- State Key Laboratory of Fine Chemicals , Dalian University of Technology , 2 Linggong Road , High-tech District, Dalian 116024 , PR China
| | - Jiangli Fan
- State Key Laboratory of Fine Chemicals , Dalian University of Technology , 2 Linggong Road , High-tech District, Dalian 116024 , PR China.,Shenzhen Research Institute , Dalian University of Technology , Nanshan District , Shenzhen 518057 , PR China
| | - Guishan Xiao
- School of Pharmaceutical Science and Technology , Dalian University of Technology , 2 Linggong Road , High-tech District, Dalian 116024 , PR China
| | - Xiaojun Peng
- State Key Laboratory of Fine Chemicals , Dalian University of Technology , 2 Linggong Road , High-tech District, Dalian 116024 , PR China.,Shenzhen Research Institute , Dalian University of Technology , Nanshan District , Shenzhen 518057 , PR China
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Bhandari Neupane J, Neupane RP, Luo Y, Yoshida WY, Sun R, Williams PG. Characterization of Leptazolines A-D, Polar Oxazolines from the Cyanobacterium Leptolyngbya sp., Reveals a Glitch with the "Willoughby-Hoye" Scripts for Calculating NMR Chemical Shifts. Org Lett 2019; 21:8449-8453. [PMID: 31591889 DOI: 10.1021/acs.orglett.9b03216] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The bioactivity-guided examination of a Leptolyngbya sp. led to the isolation of leptazolines A-D (1-4), from the culture media, along with two degradation products (5 and 6). Density functional theory nuclear magnetic resonance calculations established the relative configurations of 1 and 2 and revealed that the calculated shifts depended on the operating system when using the "Willoughby-Hoye" Python scripts to streamline the processing of the output files, a previously unrecognized flaw that could lead to incorrect conclusions.
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Affiliation(s)
- Jayanti Bhandari Neupane
- Department of Chemistry , University of Hawai'i at Ma̅noa , 2545 McCarthy Mall , Honolulu , Hawaii 96822 , United States
| | - Ram P Neupane
- Department of Chemistry , University of Hawai'i at Ma̅noa , 2545 McCarthy Mall , Honolulu , Hawaii 96822 , United States
| | - Yuheng Luo
- Department of Chemistry , University of Hawai'i at Ma̅noa , 2545 McCarthy Mall , Honolulu , Hawaii 96822 , United States
| | - Wesley Y Yoshida
- Department of Chemistry , University of Hawai'i at Ma̅noa , 2545 McCarthy Mall , Honolulu , Hawaii 96822 , United States
| | - Rui Sun
- Department of Chemistry , University of Hawai'i at Ma̅noa , 2545 McCarthy Mall , Honolulu , Hawaii 96822 , United States
| | - Philip G Williams
- Department of Chemistry , University of Hawai'i at Ma̅noa , 2545 McCarthy Mall , Honolulu , Hawaii 96822 , United States
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Jiao WH, Li J, Zhang MM, Cui J, Gui YH, Zhang Y, Li JY, Liu KC, Lin HW. Frondoplysins A and B, Unprecedented Terpene-Alkaloid Bioconjugates from Dysidea frondosa. Org Lett 2019; 21:6190-6193. [PMID: 31246040 DOI: 10.1021/acs.orglett.9b01754] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wei-Hua Jiao
- Research Center for Marine Drugs, State Key Laboratory of Oncogene and Related Genes, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
| | - Jing Li
- Research Center for Marine Drugs, State Key Laboratory of Oncogene and Related Genes, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
- Biotech Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai, 201106, China
| | - Meng-Meng Zhang
- National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China
| | - Jie Cui
- Research Center for Marine Drugs, State Key Laboratory of Oncogene and Related Genes, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
| | - Yu-Han Gui
- Research Center for Marine Drugs, State Key Laboratory of Oncogene and Related Genes, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
| | - Yun Zhang
- Institute of Biology, Qilu University of Technology, Jinan, 250103, China
| | - Jing-Ya Li
- National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China
| | - Ke-Chun Liu
- Institute of Biology, Qilu University of Technology, Jinan, 250103, China
| | - Hou-Wen Lin
- Research Center for Marine Drugs, State Key Laboratory of Oncogene and Related Genes, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
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38
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Wang X, Hamann MT. Marine natural products in the discovery and development of potential pancreatic cancer therapeutics. Adv Cancer Res 2019; 144:299-314. [PMID: 31349901 PMCID: PMC11218315 DOI: 10.1016/bs.acr.2019.05.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Pancreatic cancer one of the most deadly cancers and is an increasingly significant concern for global health. The death rates for pancreatic cancer have changed little over time, even with recent expansions of first-line drugs to treat pancreatic cancer there has been little improvement in patient prognosis. Any improvements in treatment strategies will come as a much-needed reprieve to patients diagnosed with this uniquely-challenging disease. Greater attention is needed regarding the identification and development of novel chemotherapeutic strategies with unique mechanisms of action. The marine environment with its particularity has provided a diverse source of novel structural compounds with interesting activities. The marine natural products reported from 2006 to 2018 with compelling activity and potential for the control of pancreatic cancer based on in vitro and in vivo results will be summarized. A key goal of this review is to draw attention to those molecules that warrant additional preclinical development studies.
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Affiliation(s)
- Xiaojuan Wang
- Departments of Drug Discovery, Biomedical Sciences, and Public Health Sciences, Hollings Cancer Center, College of Pharmacy, Medical University of South Carolina, Charleston, SC, United States
| | - Mark T Hamann
- Departments of Drug Discovery, Biomedical Sciences, and Public Health Sciences, Hollings Cancer Center, College of Pharmacy, Medical University of South Carolina, Charleston, SC, United States.
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Nugroho AE, Morita H. Computationally-assisted discovery and structure elucidation of natural products. J Nat Med 2019; 73:687-695. [PMID: 31093833 PMCID: PMC6713678 DOI: 10.1007/s11418-019-01321-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 05/07/2019] [Indexed: 12/30/2022]
Abstract
Computer hardware development coupled with the development of quantum chemistry, new computational models and algorithms, and user-friendly interfaces have lowered the barriers to the use of computation in the discovery and structure elucidation of natural products. Consequently, the use of computational chemistry software as a tool to discover and determine the structure of natural products has become more common in recent years. In this review, we provide several examples of recent studies that used computer technology to facilitate the discovery and structure determination of various natural products.
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Affiliation(s)
- Alfarius Eko Nugroho
- Faculty of Pharmaceutical Sciences, Hoshi University, Ebara 2-4-41 Shinagawa-ku, Tokyo, 142-8501, Japan
| | - Hiroshi Morita
- Faculty of Pharmaceutical Sciences, Hoshi University, Ebara 2-4-41 Shinagawa-ku, Tokyo, 142-8501, Japan.
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40
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Abstract
A personal selection of 32 recent papers is presented covering various aspects of current developments in bioorganic chemistry and novel natural products such as niduterpenoid A from Aspergillus nidulans.
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