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Selegato DM, Zanatta AC, Pilon AC, Veloso JH, Castro-Gamboa I. Application of feature-based molecular networking and MassQL for the MS/MS fragmentation study of depsipeptides. Front Mol Biosci 2023; 10:1238475. [PMID: 37593127 PMCID: PMC10427501 DOI: 10.3389/fmolb.2023.1238475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Accepted: 07/18/2023] [Indexed: 08/19/2023] Open
Abstract
The Feature-based Molecular Networking (FBMN) is a well-known approach for mapping and identifying structures and analogues. However, in the absence of prior knowledge about the molecular class, assessing specific fragments and clusters requires time-consuming manual validation. This study demonstrates that combining FBMN and Mass Spec Query Language (MassQL) is an effective strategy for accelerating the decoding mass fragmentation pathways and identifying molecules with comparable fragmentation patterns, such as beauvericin and its analogues. To accomplish this objective, a spectral similarity network was built from ESI-MS/MS experiments of Fusarium oxysporum at various collision energies (CIDs) and paired with a MassQL search query for conserved beauvericin ions. FBMN analysis revealed that sodiated and protonated ions clustered differently, with sodiated adducts needing more collision energy and exhibiting a distinct fragmentation pattern. Based on this distinction, two sets of particular fragments were discovered for the identification of these hexadepsipeptides: ([M + H]+) m/z 134, 244, 262, and 362 and ([M + Na]+) m/z 266, 284 and 384. By using these fragments, MassQL accurately found other analogues of the same molecular class and annotated beauvericins that were not classified by FBMN alone. Furthermore, FBMN analysis of sodiated beauvericins at 70 eV revealed subclasses with distinct amino acid residues, allowing distinction between beauvericins (beauvericin and beauvericin D) and two previously unknown structural isomers with an unusual methionine sulfoxide residue. In summary, our integrated method revealed correlations between adduct types and fragmentation patterns, facilitated the detection of beauvericin clusters, including known and novel analogues, and allowed for the differentiation between structural isomers.
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Affiliation(s)
- Denise M. Selegato
- Nucleus of Bioassays, Biosynthesis, and Ecophysiology of Natural Products (NuBBE), Institute of Chemistry, São Paulo State University (UNESP), Araraquara, Brazil
| | - Ana C. Zanatta
- Núcleo de Pesquisa em Produtos Naturais e Sintéticos (NPPNS), Faculdade de Ciências Farmacêuticas, São Paulo University (USP), São Paulo, Brazil
| | - Alan C. Pilon
- Nucleus of Bioassays, Biosynthesis, and Ecophysiology of Natural Products (NuBBE), Institute of Chemistry, São Paulo State University (UNESP), Araraquara, Brazil
| | - Juvenal H. Veloso
- Nucleus of Bioassays, Biosynthesis, and Ecophysiology of Natural Products (NuBBE), Institute of Chemistry, São Paulo State University (UNESP), Araraquara, Brazil
| | - Ian Castro-Gamboa
- Nucleus of Bioassays, Biosynthesis, and Ecophysiology of Natural Products (NuBBE), Institute of Chemistry, São Paulo State University (UNESP), Araraquara, Brazil
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2
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Jagora A, Szwarc S, Litaudon M, Dumontet V, Gallard JF, Beniddir MA, Le Pogam P. Structure elucidation of an aspidofractinine-type monoterpene indole alkaloid from Melodinus reticulatus. Z NATURFORSCH C 2023; 78:271-274. [PMID: 36793235 DOI: 10.1515/znc-2022-0234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Accepted: 01/26/2023] [Indexed: 02/17/2023]
Abstract
The structure and complete NMR assignments of aspidoreticulofractine, an aspidofractinine N-oxide, are reported. Its structure was elucidated based on a combination of spectroscopic techniques including 1D and 2D NMR, high-resolution mass spectrometry, and electronic circular dichroism.
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Affiliation(s)
- Adrien Jagora
- Équipe "Chimie des substances naturelles" BioCIS, CNRS, Université Paris-Saclay, 17, avenue des Sciences, 91400, Orsay, France
| | - Sarah Szwarc
- Équipe "Chimie des substances naturelles" BioCIS, CNRS, Université Paris-Saclay, 17, avenue des Sciences, 91400, Orsay, France
| | - Marc Litaudon
- Institut de Chimie des Substances Naturelles, CNRS, ICSN UPR 2301, Université Paris-Saclay, 91198, Gif-sur-Yvette, France
| | - Vincent Dumontet
- Institut de Chimie des Substances Naturelles, CNRS, ICSN UPR 2301, Université Paris-Saclay, 91198, Gif-sur-Yvette, France
| | - Jean-François Gallard
- Institut de Chimie des Substances Naturelles, CNRS, ICSN UPR 2301, Université Paris-Saclay, 91198, Gif-sur-Yvette, France
| | - Mehdi A Beniddir
- Équipe "Chimie des substances naturelles" BioCIS, CNRS, Université Paris-Saclay, 17, avenue des Sciences, 91400, Orsay, France
| | - Pierre Le Pogam
- Équipe "Chimie des substances naturelles" BioCIS, CNRS, Université Paris-Saclay, 17, avenue des Sciences, 91400, Orsay, France
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3
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Yang LJ, Yang ZD, Li ZJ, Yang SH, Shu ZM. Stephtetrandrine A-D, bisbenzylisoquinoline alkaloids from Stephania tetrandra. Nat Prod Res 2023; 37:204-215. [PMID: 34348525 DOI: 10.1080/14786419.2021.1961135] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Four undescribed bisbenzylisoquinoline alkaloids, designated as Stephtetrandrine A-D, were isolated from the roots of Stephania tetrandra. Their structures were elucidated by IR, HRESIMS, ECD spectra, 1 D and 2 D NMR spectra and comparison with the literature data. Additional five known compounds (limacine, tetrandrine, N-trans-Feruloyltyramine, 2'-N-chloromethyltetrandrine, 2,2'-N-N-dichloromethyltetrandrine) were also isolated. N-trans-Feruloyltyramine was isolated from Stephania tetrandra for the first time. The isolated compounds were tested for monoamine oxidase, acetylcholinesterase, phosphoinositide 3-kinase α and human hepatoma cell HepG2 inhibitory activities. Stephtetrandrine C showed obvious inhibitory effect on human hepatoma HepG2, with IC50 value of 16.2 μM. Limacine and 2'-N-chloromethyltetrandrine showed moderate monoamine oxidase inhibitory effect with the IC50 values of 37.7 and 29.2 μM, respectively.
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Affiliation(s)
- Li-Jun Yang
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, P.R. China.,The Provincial Education Key Laboratory of Screening, Evaluation and Advanced Processing of Traditional Chinese Medicine and Tibetan Medicine, School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, P.R. China
| | - Zhong-Duo Yang
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, P.R. China
| | - Zhi-Jie Li
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, P.R. China
| | - Shu-Hong Yang
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, P.R. China
| | - Zong-Mei Shu
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, P.R. China
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4
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Otogo N'Nang E, Gallard JF, Champy P, Le Pogam P, Beniddir MA. Density functional theory-nuclear magnetic resonance-validated full structure elucidation of theionbrunonine C, an unstable N-oxide theionbrunonine from Mostuea brunonis. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2022; 60:1178-1184. [PMID: 35368097 DOI: 10.1002/mrc.5271] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 03/23/2022] [Accepted: 03/30/2022] [Indexed: 06/14/2023]
Abstract
The structure elucidation of theionbrunonine C, a thioether-bridged dimeric monoterpene indole alkaloid (MIA), and more generally, one of the very few sulfur-containing MIA, is reported after its isolation from Mostuea brunonis (Gelsemiaceae). This unstable structure had already been targeted for isolation in our former, molecular network-guided, investigation of this plant, but this compound had degraded before sufficient spectroscopic data could have been acquired for a complete structure assignment. With this constraint in mind, the rapid acquisition of nuclear magnetic resonance (NMR) data enabled retrieving sufficient spectroscopic information for full structure elucidation, although from a partial set of spectroscopic information (1 H and 13 C NMR; COSY, HSQC, and HMBC). In conjunction with biosynthetic considerations, the cursory examination of 13 C NMR data unambiguously defined the complete stereostructure of 1, as further supported by density functional theory (DFT)-NMR calculations and subsequent DP4 probability score.
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Affiliation(s)
- Elvis Otogo N'Nang
- Équipe "Chimie des substances naturelles" BioCIS, CNRS, Université Paris-Saclay, Châtenay-Malabry, France
- Laboratoire de chimie des substances naturelles, Département Science Fondamentale de l'Ingénieur (INSAB), Université des Sciences et Techniques de Masuku, Franceville, Gabon
| | - Jean-François Gallard
- Institut de Chimie des Substances Naturelles, CNRS, ICSN UPR 2301, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Pierre Champy
- Équipe "Chimie des substances naturelles" BioCIS, CNRS, Université Paris-Saclay, Châtenay-Malabry, France
| | - Pierre Le Pogam
- Équipe "Chimie des substances naturelles" BioCIS, CNRS, Université Paris-Saclay, Châtenay-Malabry, France
| | - Mehdi A Beniddir
- Équipe "Chimie des substances naturelles" BioCIS, CNRS, Université Paris-Saclay, Châtenay-Malabry, France
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Tang X, Fan C, Zeng J, Zhao P, Wang X, Cai W, Li T, Dai Y, Yao Z, Yao X. Targeted isolation and identification of bioactive pyrrolidine alkaloids from Codonopsis pilosula using characteristic fragmentation-assisted mass spectral networking. Chin J Nat Med 2022; 20:948-960. [PMID: 36549808 DOI: 10.1016/s1875-5364(22)60216-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Indexed: 12/24/2022]
Abstract
Codonopsis pilosula (CP), a well-known food medicine homology plant, is commonly used in many countries. In our preliminary study, a series of pyrrolidine alkaloids with high MS responses were detected as characteristic absorbed constituents in rat plasma after oral administration of CP extract. However, their structures were unclear due to the presence of various isomers and the lack of reference standards. In the present study, an MS-guided targeted isolation of pyrrolidine alkaloids of CP extract was performed by ultra-performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry (UPLC/Q-TOF MS). For data analysis under fast data directed acquisition mode (Fast-DDA), an effective approach named characteristic fragmentation-assisted mass spectral networking was successfully applied to discover new pyrrolidine alkaloids with high MS response in CP extract. As a result, seven new pyrrolizidine alkaloids [codonopyrrolidiums C-I (3-9)], together with two known ones (1 and 2), were isolated and identified by NMR spectral analysis. Among them, codonopyrrolidium B (1), codonopyrrolidium D (4) and codonopyrrolidium E (5) were evaluated for lipid-lowering activity, and they could improve high fructose-induced lipid accumulation in HepG2 cells. In addition, the characteristic MS/MS fragmentation patterns of these pyrrolizidine alkaloids were investigated, and 17 pyrrolidine alkaloids were identified. This approach could accelerate novel natural products discovery and characterize a class of natural products with MS/MS fragmentation patterns from similar chemical scaffolds. The research also provides a chemical basis for revealingin vivo effective substances in CP.
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Affiliation(s)
- Xiyang Tang
- College of Pharmacy and International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education, Jinan University, Guangzhou 510632, China
| | - Cailian Fan
- College of Medicine, Henan Engineering Research Center of Funiu Mountain's Medicinal Resources Utilization and Molecular Medicine, Pingdingshan University, Pingdingshan 467000, China.
| | - Jiaxing Zeng
- College of Pharmacy and International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education, Jinan University, Guangzhou 510632, China
| | - Pengcheng Zhao
- College of Pharmacy and International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education, Jinan University, Guangzhou 510632, China
| | - Xiaoxing Wang
- College of Pharmacy and International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education, Jinan University, Guangzhou 510632, China
| | - Wanjun Cai
- College of Pharmacy and International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education, Jinan University, Guangzhou 510632, China
| | - Ting Li
- College of Pharmacy and International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education, Jinan University, Guangzhou 510632, China
| | - Yi Dai
- College of Pharmacy and International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education, Jinan University, Guangzhou 510632, China.
| | - Zhihong Yao
- College of Pharmacy and International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education, Jinan University, Guangzhou 510632, China
| | - Xinsheng Yao
- College of Pharmacy and International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education, Jinan University, Guangzhou 510632, China
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Yuan Y, Wu Y, Suganthy N, Shanmugam S, Brindhadevi K, Sabour A, Alshiekheid M, Lan Chi NT, Pugazhendhi A, Shanmuganathan R. Biosynthesis of zirconium nanoparticles (ZrO2 NPs) by Phyllanthus niruri extract: Characterization and its photocatalytic dye degradation activity. Food Chem Toxicol 2022; 168:113340. [DOI: 10.1016/j.fct.2022.113340] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 07/19/2022] [Accepted: 07/29/2022] [Indexed: 01/17/2023]
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Metabolomics with multi-block modelling of mass spectrometry and nuclear magnetic resonance in order to discriminate Haplosclerida marine sponges. Anal Bioanal Chem 2022; 414:5929-5942. [PMID: 35725831 DOI: 10.1007/s00216-022-04158-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 05/23/2022] [Accepted: 05/31/2022] [Indexed: 12/11/2022]
Abstract
A comprehensive metabolomic strategy, integrating 1H NMR and MS-based multi-block modelling in conjunction with multi-informational molecular networking, has been developed to discriminate sponges of the order Haplosclerida, well known for being taxonomically contentious. An in-house collection of 33 marine sponge samples belonging to three families (Callyspongiidae, Chalinidae, Petrosiidae) and four different genera (Callyspongia, Haliclona, Petrosia, Xestospongia) was investigated using LC-MS/MS, molecular networking, and the annotations processes combined with NMR data and multivariate statistical modelling. The combination of MS and NMR data into supervised multivariate models led to the discrimination of, out of the four genera, three groups based on the presence of metabolites, not necessarily previously described in the Haplosclerida order. Although these metabolomic methods have already been applied separately, it is the first time that a multi-block untargeted approach using MS and NMR has been combined with molecular networking and statistically analyzed, pointing out the pros and cons of this strategy.
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Freire VF, Gubiani JR, Spencer TM, Hajdu E, Ferreira AG, Ferreira DAS, de Castro Levatti EV, Burdette JE, Camargo CH, Tempone AG, Berlinck RGS. Feature-Based Molecular Networking Discovery of Bromopyrrole Alkaloids from the Marine Sponge Agelas dispar. JOURNAL OF NATURAL PRODUCTS 2022; 85:1340-1350. [PMID: 35427139 PMCID: PMC9680911 DOI: 10.1021/acs.jnatprod.2c00094] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Investigation of the marine sponge Agelas dispar MeOH fractions using feature-based molecular networking, dereplication, and isolation led to the discovery of new bromopyrrole-derived metabolites. An in-house library of bromopyrrole alkaloids previously isolated from A. dispar and Dictyonella sp. was utilized, along with the investigation of an MS/MS fragmentation of these compounds. Our strategy led to the isolation and identification of the disparamides A-C (1-3), with a novel carbon skeleton. Additionally, new dispyrins B-F (4-8) and nagelamides H2 and H3 (9 and 10) and known nagelamide H (11), citrinamine B (12), ageliferin (13), bromoageliferin (14), and dibromoageliferin (15) were also isolated and identified by analysis of spectroscopic data. Analysis of MS/MS fragmentation data and molecular networking analysis indicated the presence of hymenidin (16), oroidin (17), dispacamide (18), monobromodispacamide (19), keramadine (20), longamide B (21), methyl ester of longamide B (22), hanishin (23), methyl ester of 3-debromolongamide B (24), and 3-debromohanishin (25). Antibacterial activity of ageliferin (13), bromoageliferin (14), and dibromoageliferin (15) was evaluated against susceptible and multi-drug-resistant ESKAPE pathogenic bacteria Klabsiella pneumoniae, Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Acinetobacter baumannii, and Enterococcus faecalis. Dibromoageliferin (15) displayed the most potent antimicrobial activity against all tested susceptible and MDR strains. Compounds 13-15 presented no significant hemolytic activity up to 100 μM.
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Affiliation(s)
- Vítor F Freire
- Instituto de Química de São Carlos, Universidade de São Paulo, CP 780, CEP 13560-970, São Carlos, SP, Brazil
| | - Juliana R Gubiani
- Instituto de Química de São Carlos, Universidade de São Paulo, CP 780, CEP 13560-970, São Carlos, SP, Brazil
| | - Tara M Spencer
- Department of Pharmaceutical Sciences, Center for Biomolecular Sciences, College of Pharmacy, University of Illinois at Chicago, 833 South Wood Street, Chicago, Illinois 60612, United States
| | - Eduardo Hajdu
- Museu Nacional, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, s/n, CEP 20940-040, Rio de Janeiro, RJ, Brazil
| | - Antonio G Ferreira
- Departamento de Química, Universidade Federal de São Carlos, Rod. Washington Luiz, km 235 - SP-310, CEP 13565-905, São Carlos, SP, Brazil
| | - Dayana A S Ferreira
- Instituto Adolfo Lutz, Secretaria de Saúde do Estado de São Paulo, Avenida Dr. Arnaldo, 351 8 Andar, sala 9, CEP 01246-000 Sao Paulo, Brazil
| | - Erica V de Castro Levatti
- Instituto Adolfo Lutz, Secretaria de Saúde do Estado de São Paulo, Avenida Dr. Arnaldo, 351 8 Andar, sala 9, CEP 01246-000 Sao Paulo, Brazil
| | - Joanna E Burdette
- Department of Pharmaceutical Sciences, Center for Biomolecular Sciences, College of Pharmacy, University of Illinois at Chicago, 833 South Wood Street, Chicago, Illinois 60612, United States
| | - Carlos Henrique Camargo
- Instituto Adolfo Lutz, Secretaria de Saúde do Estado de São Paulo, Avenida Dr. Arnaldo, 351 8 Andar, sala 9, CEP 01246-000 Sao Paulo, Brazil
| | - Andre G Tempone
- Instituto Adolfo Lutz, Secretaria de Saúde do Estado de São Paulo, Avenida Dr. Arnaldo, 351 8 Andar, sala 9, CEP 01246-000 Sao Paulo, Brazil
| | - Roberto G S Berlinck
- Instituto de Química de São Carlos, Universidade de São Paulo, CP 780, CEP 13560-970, São Carlos, SP, Brazil
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Kirchweger B, Klein-Junior LC, Pretsch D, Chen Y, Cretton S, Gasper AL, Heyden YV, Christen P, Kirchmair J, Henriques AT, Rollinger JM. Azepine-Indole Alkaloids From Psychotria nemorosa Modulate 5-HT 2A Receptors and Prevent in vivo Protein Toxicity in Transgenic Caenorhabditis elegans. Front Neurosci 2022; 16:826289. [PMID: 35360162 PMCID: PMC8963987 DOI: 10.3389/fnins.2022.826289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 01/18/2022] [Indexed: 11/26/2022] Open
Abstract
Nemorosine A (1) and fargesine (2), the main azepine-indole alkaloids of Psychotria nemorosa, were explored for their pharmacological profile on neurodegenerative disorders (NDs) applying a combined in silico–in vitro–in vivo approach. By using 1 and 2 as queries for similarity-based searches of the ChEMBL database, structurally related compounds were identified to modulate the 5-HT2A receptor; in vitro experiments confirmed an agonistic effect for 1 and 2 (24 and 36% at 10 μM, respectively), which might be linked to cognition-enhancing properties. This and the previously reported target profile of 1 and 2, which also includes BuChE and MAO-A inhibition, prompted the evaluation of these compounds in several Caenorhabditis elegans models linked to 5-HT modulation and proteotoxicity. On C. elegans transgenic strain CL4659, which expresses amyloid beta (Aβ) in muscle cells leading to a phenotypic paralysis, 1 and 2 reduced Aβ proteotoxicity by reducing the percentage of paralyzed worms to 51%. Treatment of the NL5901 strain, in which α-synuclein is yellow fluorescent protein (YFP)-tagged, with 1 and 2 (10 μM) significantly reduced the α-synuclein expression. Both alkaloids were further able to significantly extend the time of metallothionein induction, which is associated with reduced neurodegeneration of aged brain tissue. These results add to the multitarget profiles of 1 and 2 and corroborate their potential in the treatment of NDs.
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Affiliation(s)
- Benjamin Kirchweger
- Department of Pharmaceutical Sciences, Division of Pharmacognosy, University of Vienna, Vienna, Austria
| | - Luiz C Klein-Junior
- School of Health Sciences, Universidade do Vale do Itajaí (UNIVALI), Itajaí, Brazil.,Laboratory of Pharmacognosy and Quality Control of Phytomedicines, Faculty of Pharmacy, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Dagmar Pretsch
- Department of Pharmaceutical Sciences, Division of Pharmacognosy, University of Vienna, Vienna, Austria
| | - Ya Chen
- Department of Pharmaceutical Sciences, Division of Pharmaceutical Chemistry, University of Vienna, Vienna, Austria
| | - Sylvian Cretton
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Geneva, Switzerland
| | - André L Gasper
- Herbarium Dr. Roberto Miguel Klein, Department of Natural Sciences, Universidade Regional de Blumenau (FURB), Blumenau, Brazil
| | - Yvan Vander Heyden
- Department of Analytical Chemistry, Applied Chemometrics and Molecular Modeling, Center for Pharmaceutical Research (CePhaR), Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Philippe Christen
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Geneva, Switzerland
| | - Johannes Kirchmair
- Department of Pharmaceutical Sciences, Division of Pharmaceutical Chemistry, University of Vienna, Vienna, Austria
| | - Amélia T Henriques
- Laboratory of Pharmacognosy and Quality Control of Phytomedicines, Faculty of Pharmacy, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Judith M Rollinger
- Department of Pharmaceutical Sciences, Division of Pharmacognosy, University of Vienna, Vienna, Austria
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Gontijo DC, do Nascimento MFA, Rody HVS, Magalhães RA, Margalho LF, Brandão GC, de Oliveira AB. In vitro antiplasmodial activity, targeted LC-MS metabolite profiling, and identification of major natural products in the bioactive extracts of Palicourea and Psychotria species from the Amazonia and Atlantic Forest biomes, Brazil. Metabolomics 2021; 17:81. [PMID: 34480651 DOI: 10.1007/s11306-021-01833-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 08/25/2021] [Indexed: 10/20/2022]
Abstract
INTRODUCTION A great variety of bioactive natural products has been reported for different Palicourea and Psychotria species (Rubiaceae). However, few of them as well as few of species of these botanical genera have been evaluated for antiplasmodial activity. OBJECTIVE To assess the antiplasmodial activity of 24 extracts from Palicourea and Psychotria genera, along with the targeted LC-MS metabolite profiling, as well as identification of the main metabolites in the bioactive extracts. METHODS Twenty four ethanol and acid-base extracts from Palicourea and Psychotria genera collected in the Amazonia and Atlantic Forest, Brazil, were evaluated against chloroquine-resistant Plasmodium falciparum W2 strain by PfLDH. The metabolite profiling and putative identification of metabolites from bioactive extracts were determined by LC-DAD-ESI-MS and LC-HRMS, respectively. RESULTS The ethanol extracts disclosed low antiplasmodial activity (% GI < 50%). High antiplasmodial effect was observed for the acid-base extracts from Psychotria apoda and Psychotria colorata with 100% inhibition of parasite growth inhibition. Fragment ions related to pyrrolidinoindoline alkaloids were observed by LC-DAD-ESI-MS mainly in the most bioactive extracts. The results of the in vitro screening associated with the LC-DAD-ESI-MS and LC-HRMSn data allowed to predict, for the first time, the pyrrolidinoindoline alkaloids as possible antiplasmodial representing, then, new potential natural antimalarial hits. In addition, other metabolite classes such as flavanones, lignans and chalcones were also putatively identified in the bioactive extracts of Psychotria apoda, Psychotria capitata, and Psychotria poeppigiana. CONCLUSION The present results point to Palicourea and Psychotria species as sources of new antimalarial hits.
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Affiliation(s)
- Douglas Costa Gontijo
- Departamento de Produtos Farmacêuticos, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, MG, 31270-901, Brazil
| | - Maria Fernanda Alves do Nascimento
- Departamento de Produtos Farmacêuticos, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, MG, 31270-901, Brazil
| | - Hugo Vianna Silva Rody
- Escola Superior de Agricultura "Luiz de Queiroz", Departamento de Genética, Universidade de São Paulo, Av. Pádua Dias, 11, Piracicaba, SP, 13418-900, Brazil
| | - Rodrigo Andrade Magalhães
- Departamento de Botânica, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, MG, 31270-901, Brazil
| | | | - Geraldo Célio Brandão
- Escola de Farmácia, Universidade Federal de Ouro Preto, Morro Do Cruzeiro, s/n, Ouro Prêto, MG, 35400-000, Brazil
| | - Alaíde Braga de Oliveira
- Departamento de Produtos Farmacêuticos, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, MG, 31270-901, Brazil.
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Liu X, Wang Y, Alizade V, Khutsishvili M, Atha D, Borris RP, Clark BR. Cruciasides C-G, monoterpenoid glycosides from Cruciata articulata. PHYTOCHEMISTRY 2021; 189:112821. [PMID: 34107434 DOI: 10.1016/j.phytochem.2021.112821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 05/03/2021] [Accepted: 05/19/2021] [Indexed: 06/12/2023]
Abstract
Cruciata articulata (L.) Ehrend. is a herbaceous species distributed in parts of Western Asia and the Mediterranean region. While research on other species in the Cruciata genus has revealed the presence of a range of flavonoids and terpenoids, few such studies have been conducted on C. articulata. Thus, in the current study, a phytochemical investigation of C. articulata was carried out. Molecular networking identified a large cluster of compounds sharing distinctive MS-MS fragmentation patterns that were targeted for isolation, leading to the isolation of five undescribed monoterpenoid glycosides, cruciasides C-G, along with two known monoterpenoid glycosides. The structures of these compounds were elucidated by using chemical and spectroscopic analyses, including 1D and 2D NMR, and MS-MS fragmentation. Structures for the ions observed in the MS-MS were proposed, and based on these fragmentation patterns, structures for several of the minor components observed in the molecular network were also proposed. All isolated compounds were tested for cytotoxic, anti-inflammatory, antimicrobial, and α-glucosidase inhibitory properties, but did not display any activity.
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Affiliation(s)
- Xueling Liu
- School of Pharmaceutical Science and Technology, Health Sciences Platform, Tianjin University, Tianjin, 300072, China
| | - Yali Wang
- School of Pharmaceutical Science and Technology, Health Sciences Platform, Tianjin University, Tianjin, 300072, China
| | - Valida Alizade
- Institute of Botany, Azerbaijan National Academy of Sciences, Baku, AZ1102, Azerbaijan
| | - Manana Khutsishvili
- National Herbarium of Georgia, Ilia State University, Tbilisi, 100995, Georgia
| | | | - Robert P Borris
- School of Pharmaceutical Science and Technology, Health Sciences Platform, Tianjin University, Tianjin, 300072, China
| | - Benjamin R Clark
- School of Pharmaceutical Science and Technology, Health Sciences Platform, Tianjin University, Tianjin, 300072, China.
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12
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Porras G, Chassagne F, Lyles JT, Marquez L, Dettweiler M, Salam AM, Samarakoon T, Shabih S, Farrokhi DR, Quave CL. Ethnobotany and the Role of Plant Natural Products in Antibiotic Drug Discovery. Chem Rev 2021; 121:3495-3560. [PMID: 33164487 PMCID: PMC8183567 DOI: 10.1021/acs.chemrev.0c00922] [Citation(s) in RCA: 124] [Impact Index Per Article: 41.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The crisis of antibiotic resistance necessitates creative and innovative approaches, from chemical identification and analysis to the assessment of bioactivity. Plant natural products (NPs) represent a promising source of antibacterial lead compounds that could help fill the drug discovery pipeline in response to the growing antibiotic resistance crisis. The major strength of plant NPs lies in their rich and unique chemodiversity, their worldwide distribution and ease of access, their various antibacterial modes of action, and the proven clinical effectiveness of plant extracts from which they are isolated. While many studies have tried to summarize NPs with antibacterial activities, a comprehensive review with rigorous selection criteria has never been performed. In this work, the literature from 2012 to 2019 was systematically reviewed to highlight plant-derived compounds with antibacterial activity by focusing on their growth inhibitory activity. A total of 459 compounds are included in this Review, of which 50.8% are phenolic derivatives, 26.6% are terpenoids, 5.7% are alkaloids, and 17% are classified as other metabolites. A selection of 183 compounds is further discussed regarding their antibacterial activity, biosynthesis, structure-activity relationship, mechanism of action, and potential as antibiotics. Emerging trends in the field of antibacterial drug discovery from plants are also discussed. This Review brings to the forefront key findings on the antibacterial potential of plant NPs for consideration in future antibiotic discovery and development efforts.
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Affiliation(s)
- Gina Porras
- Center for the Study of Human Health, Emory University, 1557 Dickey Dr., Atlanta, Georgia 30322
| | - François Chassagne
- Center for the Study of Human Health, Emory University, 1557 Dickey Dr., Atlanta, Georgia 30322
| | - James T. Lyles
- Center for the Study of Human Health, Emory University, 1557 Dickey Dr., Atlanta, Georgia 30322
| | - Lewis Marquez
- Molecular and Systems Pharmacology Program, Laney Graduate School, Emory University, 615 Michael St., Whitehead 115, Atlanta, Georgia 30322
| | - Micah Dettweiler
- Department of Dermatology, Emory University, 615 Michael St., Whitehead 105L, Atlanta, Georgia 30322
| | - Akram M. Salam
- Molecular and Systems Pharmacology Program, Laney Graduate School, Emory University, 615 Michael St., Whitehead 115, Atlanta, Georgia 30322
| | - Tharanga Samarakoon
- Emory University Herbarium, Emory University, 1462 Clifton Rd NE, Room 102, Atlanta, Georgia 30322
| | - Sarah Shabih
- Center for the Study of Human Health, Emory University, 1557 Dickey Dr., Atlanta, Georgia 30322
| | - Darya Raschid Farrokhi
- Center for the Study of Human Health, Emory University, 1557 Dickey Dr., Atlanta, Georgia 30322
| | - Cassandra L. Quave
- Center for the Study of Human Health, Emory University, 1557 Dickey Dr., Atlanta, Georgia 30322
- Emory University Herbarium, Emory University, 1462 Clifton Rd NE, Room 102, Atlanta, Georgia 30322
- Department of Dermatology, Emory University, 615 Michael St., Whitehead 105L, Atlanta, Georgia 30322
- Molecular and Systems Pharmacology Program, Laney Graduate School, Emory University, 615 Michael St., Whitehead 115, Atlanta, Georgia 30322
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13
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Liu D, Han Y, Zhou H, Jin H, Kang H, Huang F, Liu Y, Liang X. Offline preparative three-dimensional HPLC for systematic and efficient purification of alkaloids from Gelsemium elegans Benth. J Chromatogr A 2021; 1640:461935. [PMID: 33556681 DOI: 10.1016/j.chroma.2021.461935] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 01/20/2021] [Accepted: 01/21/2021] [Indexed: 12/01/2022]
Abstract
The natural compound library is the most productive source in drug discovery and alkaloids are the most potential drug leads in natural compounds. Presently, systematic purification of alkaloids remains a substantial challenge. In this study, we developed an offline preparative three-dimensional HPLC (3D-HPLC) method to resolve the problem of systematic purification of alkaloids. Ten Gelsemium standards were used in the construction of the method to evaluate several factors, including column selectivity, column loadability and separation orthogonality. The offline 3D-HPLC method achieved great orthogonal selectivity and resolution power using different stationary phases, mobile phases at different pH, and different mobile phase additives. Application of this 3D-HPLC method to Gelsemium elegans Benth. was evaluated, and 24 indole alkaloids were finally isolated, including four new alkaloids and one first-identified in this plant. Moreover, a total of 229 compounds were estimated to be obtained in this plant, almost twice the number of known Gelsemium alkaloids. Therefore, this 3D-HPLC method will be efficient for systematic purification of alkaloids from Gelsemium elegans Benth. and has the potential for alkaloid preparation from other plants.
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Affiliation(s)
- Dian Liu
- Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China; University of Chinese Academy of Sciences, Beijing, China
| | - Yang Han
- Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China; University of Chinese Academy of Sciences, Beijing, China
| | - Han Zhou
- Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
| | - Hongli Jin
- Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
| | - Hongjian Kang
- Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China; University of Chinese Academy of Sciences, Beijing, China
| | | | - Yanfang Liu
- Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.
| | - Xinmiao Liang
- Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.
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14
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Pinto MEF, Chan LY, Koehbach J, Devi S, Gründemann C, Gruber CW, Gomes M, Bolzani VS, Cilli EM, Craik DJ. Cyclotides from Brazilian Palicourea sessilis and Their Effects on Human Lymphocytes. JOURNAL OF NATURAL PRODUCTS 2021; 84:81-90. [PMID: 33397096 PMCID: PMC7836058 DOI: 10.1021/acs.jnatprod.0c01069] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Cyclotides are plant-derived peptides found within five families of flowering plants (Violaceae, Rubiaceae, Fabaceae, Solanaceae, and Poaceae) that have a cyclic backbone and six conserved cysteine residues linked by disulfide bonds. Their presence within the Violaceae species seems ubiquitous, yet not all members of other families produce these macrocyclic peptides. The genus Palicourea Aubl. (Rubiaceae) contains hundreds of neotropical species of shrubs and small trees; however, only a few cyclotides have been discovered hitherto. Herein, five previously uncharacterized Möbius cyclotides within Palicourea sessilis and their pharmacological activities are described. Cyclotides were isolated from leaves and stems of this plant and identified as pase A-E, as well as the known peptide kalata S. Cyclotides were de novo sequenced by MALDI-TOF/TOF mass spectrometry, and their structures were solved by NMR spectroscopy. Because some cyclotides have been reported to modulate immune cells, pase A-D were assayed for cell proliferation of human primary activated T lymphocytes, and the results showed a dose-dependent antiproliferative function. The toxicity on other nonimmune cells was also assessed. This study reveals that pase cyclotides have potential for applications as immunosuppressants and in immune-related disorders.
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Affiliation(s)
- Meri Emili F. Pinto
- Institute
of Chemistry, São Paulo State University−UNESP, Araraquara, 14800-060 SP, Brazil
- Institute
for Molecular Bioscience, Australian Research Council Centre of Excellence
for Innovations in Peptide and Protein Science, The University of Queensland, Brisbane, 4072 Queensland, Australia
- Phone: 55-16-33019510.
| | - Lai Yue Chan
- Institute
for Molecular Bioscience, Australian Research Council Centre of Excellence
for Innovations in Peptide and Protein Science, The University of Queensland, Brisbane, 4072 Queensland, Australia
| | - Johannes Koehbach
- Institute
for Molecular Bioscience, Australian Research Council Centre of Excellence
for Innovations in Peptide and Protein Science, The University of Queensland, Brisbane, 4072 Queensland, Australia
| | - Seema Devi
- Institute
for Infection Prevention and Hospital Epidemiology, Center for Complementary
Medicine, University of Freiburg, 79111 Freiburg, Germany
| | - Carsten Gründemann
- Translational
Complementary Medicine, Department of Pharmaceutical Sciences, University of Basel, 4056 Basel, Switzerland
| | - Christian W. Gruber
- Center
for Physiology and Pharmacology, Medical
University of Vienna, 1090 Vienna, Austria
| | - Mario Gomes
- Rio
de Janeiro
Botanic Garden Research Institute−JBRJ, Rio de Janeiro, 22470-180 RJ, Brazil
| | - Vanderlan S. Bolzani
- Institute
of Chemistry, São Paulo State University−UNESP, Araraquara, 14800-060 SP, Brazil
| | - Eduardo Maffud Cilli
- Institute
of Chemistry, São Paulo State University−UNESP, Araraquara, 14800-060 SP, Brazil
| | - David J. Craik
- Institute
for Molecular Bioscience, Australian Research Council Centre of Excellence
for Innovations in Peptide and Protein Science, The University of Queensland, Brisbane, 4072 Queensland, Australia
- Phone: 61-7-3346-2019.
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15
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Tuzimski T, Petruczynik A. Application of HPLC-DAD for In Vitro Investigation of Acetylcholinesterase Inhibition Activity of Selected Isoquinoline Alkaloids from Sanguinaria canadensis Extracts. Molecules 2021; 26:molecules26010230. [PMID: 33466254 PMCID: PMC7796366 DOI: 10.3390/molecules26010230] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 12/30/2020] [Accepted: 01/01/2021] [Indexed: 12/17/2022] Open
Abstract
Isoquinoline alkaloids may have a wide range of pharmacological activities. Some of them have acetylcholinesterase activity inhibition. Nowadays, neurodegenerative disorders such as Alzheimer’s disease have become a serious public health problem. Searching for new effective compounds with inhibited acetylcholinesterase activity is one of the most significant challenges of modern scientific research. The aim of this study was the in vitro investigation of acetylcholinesterase activity inhibition of extracts obtained from Sanguinaria canadensis collected before, during and after flowering. The acetylcholinesterase activity inhibition of these extracts has not been previously tested. The aim was also to quantify selected alkaloids in the investigated extracts by high performance liquid chromatography (HPLC). The analyses of alkaloid content were performed using HPLC in reversed phase (RP) mode using Polar RP column and mobile phase containing acetonitrile, water and ionic liquid (IL). The acetylcholinesterase activity inhibition of the tested plant extracts and respective alkaloid standards were examined using high performance liquid chromatography with diode-array detector (HPLC-DAD) for the quantification of 5-thio-2-nitro-benzoic acid, which is the product of the reaction between the thiocholine (product of the hydrolysis of acetylthiocholine reaction) with Ellman reagent. The application of the HPLC method allowed for elimination of absorption of interfering components, for example, alkaloids such as sanguinarine and berberine. It is revealed that the HPLC method can be successfully used for the evaluation of the acetylcholinesterase inhibitory activity in samples such as plant extracts, especially those containing colored components adsorbing at wavelength in the range 405–412 nm. The acetylcholinesterase inhibition activity synergy of pairs of alkaloid standards and mixture of all investigated alkaloids was also determined. Most investigated alkaloids and all Sanguinaria canadensis extracts exhibited very high acetylcholinesterase activity inhibition. IC50 values obtained for alkaloid standards were from 0.36 for berberine to 23.13 µg/mL for protopine and from 61.24 to 89.14 µg/mL for Sanguinaria canadensis extracts. Our investigations demonstrated that these plant extracts can be recommended for further in vivo experiments to confirm their acetylcholinesterase activity inhibition.
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Affiliation(s)
- Tomasz Tuzimski
- Department of Physical Chemistry, Medical University of Lublin, Chodźki 4a, 20-093 Lublin, Poland
- Correspondence: (T.T.); (A.P.); Tel.: +48-664772307 (T.T.); +48-510664914 (A.P.)
| | - Anna Petruczynik
- Department of Inorganic Chemistry, Medical University of Lublin, Chodźki 4a, 20-093 Lublin, Poland
- Correspondence: (T.T.); (A.P.); Tel.: +48-664772307 (T.T.); +48-510664914 (A.P.)
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16
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Rak Lee S, Schalk F, Schwitalla JW, Benndorf R, Vollmers J, Kaster AK, de Beer ZW, Park M, Ahn MJ, Jung WH, Beemelmanns C, Kim KH. Polyhalogenation of Isoflavonoids by the Termite-Associated Actinomadura sp. RB99. JOURNAL OF NATURAL PRODUCTS 2020; 83:3102-3110. [PMID: 32946237 DOI: 10.1021/acs.jnatprod.0c00676] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Based on high-resolution tandem mass spectrometry (HR-MS2) and global natural products social molecular networking (GNPS), we found that plant-derived daidzein and genistein derivatives are polyhalogenated by termite-associated Actinomadura species RB99. MS-guided purification from extracts of bacteria grown under optimized conditions led to the isolation of eight polychlorinated isoflavones, including six unreported derivatives, and seven novel polybrominated derivatives, two of which showed antimicrobial activity.
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Affiliation(s)
- Seoung Rak Lee
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Felix Schalk
- Leibniz Institute for Natural Product Research and Infection Biology-Hans Knöll Institute (HKI), Beutenbergstraße 11a, 07745 Jena, Germany
| | - Jan W Schwitalla
- Leibniz Institute for Natural Product Research and Infection Biology-Hans Knöll Institute (HKI), Beutenbergstraße 11a, 07745 Jena, Germany
| | - René Benndorf
- Leibniz Institute for Natural Product Research and Infection Biology-Hans Knöll Institute (HKI), Beutenbergstraße 11a, 07745 Jena, Germany
| | - John Vollmers
- Institute for Biological Interfaces 5, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Anne-Kristin Kaster
- Institute for Biological Interfaces 5, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Z Wilhelm de Beer
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Hatfield, 0083, Pretoria, South Africa
| | - Minji Park
- Department of Systems Biotechnology, Chung-Ang University, Anseong 17546, Republic of Korea
| | - Mi-Jeong Ahn
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Won Hee Jung
- Department of Systems Biotechnology, Chung-Ang University, Anseong 17546, Republic of Korea
| | - Christine Beemelmanns
- Leibniz Institute for Natural Product Research and Infection Biology-Hans Knöll Institute (HKI), Beutenbergstraße 11a, 07745 Jena, Germany
| | - Ki Hyun Kim
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Republic of Korea
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17
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Samulski GB, Gontijo DC, Moreira NC, Brandão GC, Braga de Oliveira A. Dereplication of Palicourea sessilis ethanol extracts by UPLC-DAD-ESI-MS/MS discloses the presence of hydroxycinnamic acid amides and the absence of monoterpene indole alkaloids. BIOCHEM SYST ECOL 2020. [DOI: 10.1016/j.bse.2020.104114] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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18
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Santos CLG, Angolini CFF, Neves KOG, Costa EV, de Souza ADL, Pinheiro MLB, Koolen HHF, da Silva FMA. Molecular networking-based dereplication of strictosidine-derived monoterpene indole alkaloids from the curare ingredient Strychnos peckii. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2020; 34 Suppl 3:e8683. [PMID: 31783430 DOI: 10.1002/rcm.8683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 10/16/2019] [Accepted: 11/25/2019] [Indexed: 06/10/2023]
Abstract
RATIONALE Monoterpene indole alkaloids (MIAs) are a large group of biologically active compounds produced by hundreds of plant species in numerous plant families, such as Apocynaceae, Loganiaceae and Rubiaceae. Although this diversity is biosynthetically intermediated by strictosidine, there are no works focused on the fragmentation patterns under collision-induced dissociation of strictosidine-derived alkaloids. METHODS Initially, the alkaloid fingerprint of Strychnos peckii was established using leaf spray with tandem mass spectrometry (LS-MS/MS). Then, high-performance liquid chromatography coupled to tandem mass spectrometry (HPLC/MS/MS) analyses were carried out to focus on the patterns of neutral losses in product ion scan experiments with the leaf aqueous extract. Finally, the product ion spectra from a set of presumable strictosidine-type derivatives were analyzed and organized via molecular networking (MN), and dereplicated by manual interpretation of MS/MS spectra. RESULTS LS-MS/MS allowed the tentative identification of strictosidine-derived alkaloids in the leaves of S. peckii, showing useful neutral losses for the dereplication of strictosidine analogues by HPLC/MS/MS experiments. The use of MN combined with manual interpretation of the fragmentation patterns highlighted characteristic fragmentation pathways, and allowed the tentative identification of strictosidine, desoxycordifoline, strictosidinic acid, 10-hydroxystrictosidine, 5-carboxystrictosidine, lyaloside, 3,4-dehydrostrictosidine and strictosidine lactam. CONCLUSIONS The use of MN combined with the analysis of the fragmentation patterns proved to be a useful strategy for the dereplication of strictosidine-derived MIAs from S. peckii, highlighting known and unprecedented structures, as well as useful diagnostic product ions. Therefore, this workflow is an effective approach for the characterization of strictosidine-type alkaloids in future dereplication works.
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Affiliation(s)
- Carla L G Santos
- Central Analítica - Centro de Apoio Multidisciplinar (CAM), Universidade Federal do Amazonas (UFAM), Manaus, AM, 69077-000, Brazil
| | - Célio F F Angolini
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Santo André, SP, 09210-580, Brazil
| | - Kidney O G Neves
- Central Analítica - Centro de Apoio Multidisciplinar (CAM), Universidade Federal do Amazonas (UFAM), Manaus, AM, 69077-000, Brazil
| | - Emmanoel V Costa
- Departamento de Química, Universidade Federal do Amazonas (UFAM), Manaus, AM, 69077-000, Brazil
| | - Afonso D L de Souza
- Central Analítica - Centro de Apoio Multidisciplinar (CAM), Universidade Federal do Amazonas (UFAM), Manaus, AM, 69077-000, Brazil
- Departamento de Química, Universidade Federal do Amazonas (UFAM), Manaus, AM, 69077-000, Brazil
| | - Maria Lúcia B Pinheiro
- Central Analítica - Centro de Apoio Multidisciplinar (CAM), Universidade Federal do Amazonas (UFAM), Manaus, AM, 69077-000, Brazil
- Departamento de Química, Universidade Federal do Amazonas (UFAM), Manaus, AM, 69077-000, Brazil
| | - Hector H F Koolen
- Grupo de Pesquisa em Metabolômica e Espectrometria de Massas, Universidade do Estado do Amazonas, Manaus, AM, 69050-010, Brazil
| | - Felipe M A da Silva
- Central Analítica - Centro de Apoio Multidisciplinar (CAM), Universidade Federal do Amazonas (UFAM), Manaus, AM, 69077-000, Brazil
- Departamento de Química, Universidade Federal do Amazonas (UFAM), Manaus, AM, 69077-000, Brazil
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19
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Kornpointner C, Berger A, Traxler F, Hadžiabdić A, Massar M, Matek J, Brecker L, Schinnerl J. Alkaloid and iridoid glucosides from Palicourea luxurians (Rubiaceae: Palicoureeae) indicate tryptamine- and tryptophan-iridoid alkaloid formation apart the strictosidine pathway. PHYTOCHEMISTRY 2020; 173:112296. [PMID: 32087436 DOI: 10.1016/j.phytochem.2020.112296] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Revised: 01/21/2020] [Accepted: 02/06/2020] [Indexed: 06/10/2023]
Abstract
The first phytochemical examination of extracts from leaves and stem bark of Palicourea luxurians (Rusby) Borhidi yielded two undescribed and one known alstrostine derivative together with the oxindole alkaloid javaniside as well as with 5α-carboxystrictosidine. Additionally, five iridoids and four secologanin derived isolation artifacts have been isolated. Lack of strictosidine and its follow-up metabolization products suggested that the Pictet-Spenglerase in P. luxurians does barely or not catalyze the formation of strictosidine. Against this background the biosynthesis of javaniside and 5α-carboxystrictosidine is discussed with regard to possible reaction mechanisms. Similarly, P. luxurians used an independent biosynthetic pathway to produce alstrostine type structures from secologanin and tryptamine in a 2:1 ratio. The structure of isoalstrostine A, which was isolated for the first time, allowed the refinement of a previously reported pathway to the alstrostine type carbon skeleton as well as to some follow-up metabolization products. In spite of various biosynthetic pathways incorporating secologanin to gain different types of tryptophan- and tryptamine-iridoid alkaloids, P. luxurians accumulates this compound as well a couple of further metabolized iridoids deriving from loganin and secologanin.
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Affiliation(s)
- Christoph Kornpointner
- Department of Organic Chemistry, University of Vienna, Währinger Strasse 38, A-1090, Vienna, Austria
| | - Andreas Berger
- Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, A-1030, Vienna, Austria
| | - Florian Traxler
- Department of Organic Chemistry, University of Vienna, Währinger Strasse 38, A-1090, Vienna, Austria
| | - Azra Hadžiabdić
- Department of Organic Chemistry, University of Vienna, Währinger Strasse 38, A-1090, Vienna, Austria
| | - Magdalena Massar
- Department of Organic Chemistry, University of Vienna, Währinger Strasse 38, A-1090, Vienna, Austria
| | - Joanna Matek
- Department of Organic Chemistry, University of Vienna, Währinger Strasse 38, A-1090, Vienna, Austria
| | - Lothar Brecker
- Department of Organic Chemistry, University of Vienna, Währinger Strasse 38, A-1090, Vienna, Austria.
| | - Johann Schinnerl
- Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, A-1030, Vienna, Austria.
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20
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Klein-Júnior LC, Cretton S, Vander Heyden Y, Gasper AL, Nejad-Ebrahimi S, Christen P, Henriques AT. Bioactive Azepine-Indole Alkaloids from Psychotria nemorosa. JOURNAL OF NATURAL PRODUCTS 2020; 83:852-863. [PMID: 32150413 DOI: 10.1021/acs.jnatprod.9b00469] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Phytochemical investigation of the alkaloid extract of the aerial parts of Psychotria nemorosa led to the isolation and characterization of 10 azepine-indole alkaloids, i.e., cimitrypazepine (1), fargesine (2), nemorosines A (3), and B (12), nemorosinosides A-F (4-9), as well as two β-carboline derivatives, 10-hydroxyisodolichantoside (10) and 10-hydroxydolichantoside (11), an isoxazole alkaloid, nemorosinoside G (13), serotonin (14), bufotenine (15), and (S)-gentianol (16). Compounds 3-13 have not yet been described. These compounds were isolated by semipreparative HPLC, and their structures were determined by means of HRMS, NMR, and ECD measurements. In addition, the monoamine oxidase-A (MAO-A), MAO-B, acetylcholinesterase (AChE), and butyrylcholinesterase (BChE) inhibitory activities were evaluated. Alkaloids 1-3 inhibited the MAO-A activity with IC50 values of 1.4, 1.4, and 0.9 μM, respectively.
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Affiliation(s)
- Luiz C Klein-Júnior
- Laboratory of Pharmacognosy and Quality Control of Phytomedicines, Faculty of Pharmacy, Universidade Federal do Rio Grande do Sul-UFRGS, 90610-000 Porto Alegre/RS Brazil
- Department of Analytical Chemistry, Applied Chemometrics and Molecular Modelling, Center for Pharmaceutical Research (CePhaR), Vrije Universiteit Brussel-VUB, B-1090 Brussels, Belgium
- School of Health Sciences, Universidade do Vale do Itajaí-UNIVALI, 88302-901, Itajaí/SC Brazil
| | - Sylvian Cretton
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, 1211 Geneva 4, Switzerland
| | - Yvan Vander Heyden
- Department of Analytical Chemistry, Applied Chemometrics and Molecular Modelling, Center for Pharmaceutical Research (CePhaR), Vrije Universiteit Brussel-VUB, B-1090 Brussels, Belgium
| | - André L Gasper
- Herbarium Dr. Roberto Miguel Klein, Department of Natural Sciences, Universidade Regional de Blumenau-FURB, 89030-903 Blumenau/SC Brazil
| | - Samad Nejad-Ebrahimi
- Department of Phytochemistry, Medicinal Plants and Drugs Research Institute, Shahid Beheshti University, Evin 1983963113, Tehran Iran
| | - Philippe Christen
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, 1211 Geneva 4, Switzerland
| | - Amélia T Henriques
- Laboratory of Pharmacognosy and Quality Control of Phytomedicines, Faculty of Pharmacy, Universidade Federal do Rio Grande do Sul-UFRGS, 90610-000 Porto Alegre/RS Brazil
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21
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Lautié E, Russo O, Ducrot P, Boutin JA. Unraveling Plant Natural Chemical Diversity for Drug Discovery Purposes. Front Pharmacol 2020; 11:397. [PMID: 32317969 PMCID: PMC7154113 DOI: 10.3389/fphar.2020.00397] [Citation(s) in RCA: 78] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Accepted: 03/16/2020] [Indexed: 12/11/2022] Open
Abstract
The screening and testing of extracts against a variety of pharmacological targets in order to benefit from the immense natural chemical diversity is a concern in many laboratories worldwide. And several successes have been recorded in finding new actives in natural products, some of which have become new drugs or new sources of inspiration for drugs. But in view of the vast amount of research on the subject, it is surprising that not more drug candidates were found. In our view, it is fundamental to reflect upon the approaches of such drug discovery programs and the technical processes that are used, along with their inherent difficulties and biases. Based on an extensive survey of recent publications, we discuss the origin and the variety of natural chemical diversity as well as the strategies to having the potential to embrace this diversity. It seemed to us that some of the difficulties of the area could be related with the technical approaches that are used, so the present review begins with synthetizing some of the more used discovery strategies, exemplifying some key points, in order to address some of their limitations. It appears that one of the challenges of natural product-based drug discovery programs should be an easier access to renewable sources of plant-derived products. Maximizing the use of the data together with the exploration of chemical diversity while working on reasonable supply of natural product-based entities could be a way to answer this challenge. We suggested alternative ways to access and explore part of this chemical diversity with in vitro cultures. We also reinforced how important it was organizing and making available this worldwide knowledge in an "inventory" of natural products and their sources. And finally, we focused on strategies based on synthetic biology and syntheses that allow reaching industrial scale supply. Approaches based on the opportunities lying in untapped natural plant chemical diversity are also considered.
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Affiliation(s)
- Emmanuelle Lautié
- Centro de Valorização de Compostos Bioativos da Amazônia (CVACBA)-Instituto de Ciências Biológicas, Universidade Federal do Pará (UFPA), Belém, Brazil
| | - Olivier Russo
- Institut de Recherches Internationales SERVIER, Suresnes, France
| | - Pierre Ducrot
- Molecular Modelling Department, 'PEX Biotechnologie, Chimie & Biologie, Institut de Recherches SERVIER, Croissy-sur-Seine, France
| | - Jean A Boutin
- Institut de Recherches Internationales SERVIER, Suresnes, France
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22
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Rosales PF, Bordin GS, Gower AE, Moura S. Indole alkaloids: 2012 until now, highlighting the new chemical structures and biological activities. Fitoterapia 2020; 143:104558. [PMID: 32198108 DOI: 10.1016/j.fitote.2020.104558] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 03/13/2020] [Accepted: 03/15/2020] [Indexed: 01/11/2023]
Abstract
Indole alkaloids have attracted attention because of their therapeutic properties, being anti-inflammatory, antinociceptive, antitumoural, antioxidant and antimicrobial. These compounds present a wide structural diversity, which is directly related to the genera of the producing plants, as well as the biological activities. Indole alkaloids have attracted attention over the last decade because of this combination of bioactivity and structural diversity. Therefore, this review presented recent (2012-2018) advances in alkaloids, focusing on new compounds, extraction methods and biological activities. As such, approximately 70 articles were identified, which showed 261 new compounds produced by plants of the families Apocynaceae, Rubiaceae, Annonaceae and Loganiaceae. In addition, different extraction methods were identified, and the structures of the new compounds were analysed. In addition to indole molecules, there were mono-indole-, di-indole-, vinblastine-, vimblastine-, gelsedine-, geissospermidine-, koumine-, geissospermidine-, iboga-, perakine-, corynanthe-, vincamine-, ajmaline-, aspidorpema-, strychnos-type, β-carboline alkaloids and indole alkaloid glucosides. The reported biological activities are mainly anticancer, antibacterial, antimalarial, antifungal, antiparasitic, and antiviral, as well as anti-acetylcholinesterase and anti-butyrylcolinesterase properties. This review serves as a guide for those wishing to find the most recently identified alkaloid structures and their associated activities.
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Affiliation(s)
- Pauline Fagundes Rosales
- LBIOP - Laboratory of Biotechnology of Natural and Synthetics Products, Technology Department, Biotechnology Institute, University of Caxias do Sul, Caxias do Sul, Brazil; IFRS -Federal Institute of Education, Science and Technology of Rio Grande do Sul, Campus Bento Gonçalves, Brazil
| | - Gabriela Sandri Bordin
- LBIOP - Laboratory of Biotechnology of Natural and Synthetics Products, Technology Department, Biotechnology Institute, University of Caxias do Sul, Caxias do Sul, Brazil
| | - Adriana Escalona Gower
- LBIOP - Laboratory of Biotechnology of Natural and Synthetics Products, Technology Department, Biotechnology Institute, University of Caxias do Sul, Caxias do Sul, Brazil
| | - Sidnei Moura
- LBIOP - Laboratory of Biotechnology of Natural and Synthetics Products, Technology Department, Biotechnology Institute, University of Caxias do Sul, Caxias do Sul, Brazil.
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23
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Scholarinine A, a N3 type caged-monoterpene indole alkaloid as Cav3.1 T-type calcium channel inhibitor from Alstonia scholaris. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2019.151354] [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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Agarwal G, Carcache PJB, Addo EM, Kinghorn AD. Current status and contemporary approaches to the discovery of antitumor agents from higher plants. Biotechnol Adv 2020; 38:107337. [PMID: 30633954 PMCID: PMC6614024 DOI: 10.1016/j.biotechadv.2019.01.004] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 01/03/2019] [Accepted: 01/07/2019] [Indexed: 12/13/2022]
Abstract
Higher plant constituents have afforded clinically available anticancer drugs. These include both chemically unmodified small molecules and their synthetic derivatives currently used or those in clinical trials as antineoplastic agents, and an updated summary is provided. In addition, botanical dietary supplements, exemplified by mangosteen and noni constituents, are also covered as potential cancer chemotherapeutic agents. Approaches to metabolite purification, rapid dereplication, and biological evaluation including analytical hyphenated techniques, molecular networking, and advanced cellular and animal models are discussed. Further, enhanced and targeted drug delivery systems for phytochemicals, including micelles, nanoparticles and antibody drug conjugates (ADCs) are described herein.
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Affiliation(s)
- Garima Agarwal
- Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, OH 43210, United States
| | - Peter J Blanco Carcache
- Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, OH 43210, United States
| | - Ermias Mekuria Addo
- Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, OH 43210, United States
| | - A Douglas Kinghorn
- Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, OH 43210, United States.
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25
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Fox Ramos AE, Evanno L, Poupon E, Champy P, Beniddir MA. Natural products targeting strategies involving molecular networking: different manners, one goal. Nat Prod Rep 2019; 36:960-980. [PMID: 31140509 DOI: 10.1039/c9np00006b] [Citation(s) in RCA: 128] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Covering: up to 2019Landmark advances in bioinformatics tools have recently enhanced the field of natural products research, putting today's natural product chemists in the enviable position of being able to perform the efficient targeting/discovery of previously undescribed molecules by expediting the prioritization of the isolation workflow. Among these advances, MS/MS molecular networking has appeared as a promising approach to dereplicate complex natural product mixtures, leading to a real revolution in the "art of natural product isolation" by accelerating the pace of research of this field. This review illustrates through selected cornerstone studies the new thinking in natural product isolation by drawing a parallel between the different underlying philosophies behind the use of molecular networking in targeting natural products.
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Affiliation(s)
- Alexander E Fox Ramos
- Équipe "Pharmacognosie-Chimie des Substances Naturelles", BioCIS, Univ. Paris-Sud, CNRS, Université Paris-Saclay, 5 rue J.-B. Clément, 92290, Châtenay-Malabry, France.
| | - Laurent Evanno
- Équipe "Pharmacognosie-Chimie des Substances Naturelles", BioCIS, Univ. Paris-Sud, CNRS, Université Paris-Saclay, 5 rue J.-B. Clément, 92290, Châtenay-Malabry, France.
| | - Erwan Poupon
- Équipe "Pharmacognosie-Chimie des Substances Naturelles", BioCIS, Univ. Paris-Sud, CNRS, Université Paris-Saclay, 5 rue J.-B. Clément, 92290, Châtenay-Malabry, France.
| | - Pierre Champy
- Équipe "Pharmacognosie-Chimie des Substances Naturelles", BioCIS, Univ. Paris-Sud, CNRS, Université Paris-Saclay, 5 rue J.-B. Clément, 92290, Châtenay-Malabry, France.
| | - Mehdi A Beniddir
- Équipe "Pharmacognosie-Chimie des Substances Naturelles", BioCIS, Univ. Paris-Sud, CNRS, Université Paris-Saclay, 5 rue J.-B. Clément, 92290, Châtenay-Malabry, France.
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26
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Salam AM, Quave CL. Opportunities for plant natural products in infection control. Curr Opin Microbiol 2018; 45:189-194. [PMID: 30218951 DOI: 10.1016/j.mib.2018.08.004] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 08/28/2018] [Indexed: 02/07/2023]
Abstract
The continued spread of antimicrobial resistance represents one of the most serious infectious disease threats to global health. There is consensus that a key component of addressing this threat is to replenish the waning pipeline of antimicrobials, with attention being paid to novel mechanisms of action. This includes the development of new classes of classic bacteriostatic and bactericidal antibiotics as well as antivirulence drugs, and it is especially in these areas where plant natural products demonstrate great potential. To this end, we discuss the unique characteristics of plant natural products, the advantages of plants as a resource for anti-infective drug discovery, and recent technologies that have further enabled this path of inquiry. As a result of emerging realization of their advantages, plant natural products have recently enjoyed increased scrutiny in antimicrobial lead discovery, and they will continue to serve as a source of leads. We conclude that plant natural products represent a promising and largely untapped source of new chemical entities from which novel anti-infectives can be discovered.
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Affiliation(s)
- Akram M Salam
- Molecular and Systems Pharmacology Program, Laney Graduate School, Emory University, Atlanta, GA, United States
| | - Cassandra L Quave
- Center for the Study of Human Health, Emory University College of Arts and Sciences, Atlanta, GA, United States; Department of Dermatology, Emory University School of Medicine, Atlanta, GA, United States; Antibiotic Resistance Center, Emory University, Atlanta, GA, United States; Emory University Herbarium, Atlanta, GA, United States.
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27
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Kang KB, Park EJ, da Silva RR, Kim HW, Dorrestein PC, Sung SH. Targeted Isolation of Neuroprotective Dicoumaroyl Neolignans and Lignans from Sageretia theezans Using in Silico Molecular Network Annotation Propagation-Based Dereplication. JOURNAL OF NATURAL PRODUCTS 2018; 81:1819-1828. [PMID: 30106290 DOI: 10.1021/acs.jnatprod.8b00292] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The integration of LC-MS/MS molecular networking and in silico MS/MS fragmentation is an emerging method for dereplication of natural products. In the present study, a targeted isolation of natural products using a new in silico-based annotation tool named Network Annotation Propagation (NAP) is described. NAP improves accuracy of in silico fragmentation analyses by reranking candidate structures based on the network topology from MS/MS-based molecular networking. Annotation for the MS/MS spectral network of the Sageratia theezans twig extract was performed using NAP, and most molecular families within the network, including the known triterpenoids 1-7, could be putatively annotated, without relying on any previous reports of molecules from this species. Based on the in silico dereplication results, molecules were prioritized for isolation. In total, six dicoumaroyl 8- O-4' neolignans (8-13) and three dicoumaroyl lignans (14-16) were isolated from the twigs of S. theezans and structurally characterized by spectroscopic analyses. Isolates were evaluated for their neuroprotective activity, and compounds 14-16 showed potent protective effects against glutamate-induced oxidative stress in mouse HT22 cells at a concentration of 12.5 μM.
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Affiliation(s)
- Kyo Bin Kang
- College of Pharmacy and Research Institute of Pharmaceutical Sciences , Seoul National University , Seoul 08826 , Republic of Korea
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences , University of California, San Diego , La Jolla , California 92093 , United States
| | - Eun Jin Park
- College of Pharmacy and Research Institute of Pharmaceutical Sciences , Seoul National University , Seoul 08826 , Republic of Korea
| | - Ricardo R da Silva
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences , University of California, San Diego , La Jolla , California 92093 , United States
| | - Hyun Woo Kim
- College of Pharmacy and Research Institute of Pharmaceutical Sciences , Seoul National University , Seoul 08826 , Republic of Korea
| | - Pieter C Dorrestein
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences , University of California, San Diego , La Jolla , California 92093 , United States
| | - Sang Hyun Sung
- College of Pharmacy and Research Institute of Pharmaceutical Sciences , Seoul National University , Seoul 08826 , Republic of Korea
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