1
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Suwandecha T, Yingyongnarongkul BE, Towtawin K, Voravuthikunchai SP, Sriwiriyajan S. A Novel Antibiotic, Rhodomyrtone: Pharmacokinetic Studies in a Murine Model and Optimization and Validation of High-Performance Liquid Chromatographic Method for Plasma Analysis. Antibiotics (Basel) 2024; 13:156. [PMID: 38391542 PMCID: PMC10885983 DOI: 10.3390/antibiotics13020156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 01/09/2024] [Accepted: 01/16/2024] [Indexed: 02/24/2024] Open
Abstract
Rhodomyrtone has indisputable and undeniable potential as a new antibiotic for antibiotic-resistant Gram-positive bacteria. Therefore, the main objective of this study was to determine the pharmacokinetics profiles of orally administered rhodomyrtone in rats. A reverse-phase HPLC-UV method was developed, optimized and validated for the analysis of rhodomyrtone concentrations in rat plasma. The retention time of papaverine and rhodomyrtone was 3.928 and 5.937 min, with no interference with the excipients used. The lower limit of quantification (LLOQ) of rhodomyrtone in the plasma sample was 0.04 μg/mL, the accuracy of rhodomyrtone at the LLOQ level ranged from 93.64 to 106.36%, precision was 6.59%, 80-120% for accuracy and <20% CV for precision. The calibration curve was linear at concentrations ranging from 0.04 to 128 µg/mL with a correlation coefficient (r) value of equal to or greater than 0.999. Sprague Dawley rats received a single dose of rhodomyrtone at 50 and 100 mg/kg. Blood samples were collected from tail veins. The peak plasma concentration was observed at 2 h, and the area under the curve of rhodomyrtone at 50 mg/kg and 100 mg/kg was 3.41 ± 1.04 and 7.82 ± 1.53 μg·h/mL, respectively. The results demonstrated linear pharmacokinetics characteristics at the studied dosage range. The plasma concentration of rhodomyrtone was above the minimal inhibition concentrations of several common pathogenic bacteria of medical importance. The proposed HPLC-UV method is fast, cost-effective, reliable and reproducible, and it is proposed for the routine analysis of rhodomyrtone.
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Affiliation(s)
- Tan Suwandecha
- School of Pharmacy and Drug and Cosmetic Excellence Center, Walailak University, Thaiburi, Thasala District, Nakhon Si Thammarat 80160, Thailand
| | - Boon-Ek Yingyongnarongkul
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Ramkhamhaeng University, Bangkok 10240, Thailand
| | - Kanokkan Towtawin
- Division of Health and Applied Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
| | - Supayang Piyawan Voravuthikunchai
- Center of Antimicrobial Biomaterial Innovation-Southeast Asia and Natural Product Research Center of Excellence, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
| | - Somchai Sriwiriyajan
- Division of Health and Applied Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
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2
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Gan XC, Kotesova S, Castanedo A, Green SA, Mølle SLB, Shenvi RA. Iron-Catalyzed Hydrobenzylation: Stereoselective Synthesis of (-)-Eugenial C. J Am Chem Soc 2023; 145:15714-15720. [PMID: 37437221 PMCID: PMC11055631 DOI: 10.1021/jacs.3c05428] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/14/2023]
Abstract
Metal-hydride hydrogen atom transfer (MHAT) has emerged as a useful tool to form quaternary carbons from alkenes via hydrofunctionalization. Methods to date that cross-couple alkenes with sp3 partners rely on heterobimetallic catalysis to merge the two cycles. Here, we report an iron-only cross-coupling via putative MHAT/SH2 steps that solves a key stereochemical problem in the synthesis of meroterpenoid eugenial C and obviates the need for nickel. The concise synthesis benefits from a conformationally locked o,o'-disubstituted benzyl bromide and a locally sourced chiral pool terpene coupling partner.
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Affiliation(s)
- Xu-cheng Gan
- Department of Chemistry, Scripps Research, La Jolla, California 92037, United States
| | - Simona Kotesova
- Department of Chemistry, Scripps Research, La Jolla, California 92037, United States
- Graduate School of Chemical and Biological Sciences, Scripps Research, La Jolla, California 92037, United States
| | - Alberto Castanedo
- Department of Chemistry, Scripps Research, La Jolla, California 92037, United States
| | - Samantha A. Green
- Department of Chemistry, Scripps Research, La Jolla, California 92037, United States
- Graduate School of Chemical and Biological Sciences, Scripps Research, La Jolla, California 92037, United States
| | | | - Ryan A. Shenvi
- Department of Chemistry, Scripps Research, La Jolla, California 92037, United States
- Graduate School of Chemical and Biological Sciences, Scripps Research, La Jolla, California 92037, United States
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3
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Roy P, Krishna AV, Ramachary DB. Direct Organocatalytic Reductive Alkylation of Syncarpic Acid: Scope and Applications. J Org Chem 2022; 87:16026-16038. [PMID: 36367306 DOI: 10.1021/acs.joc.2c02164] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Biologically important 4-alkylsyncarpic acids, which resemble the core structure of many natural products, were synthesized in one-pot through the organocatalytic three-component reductive alkylation with excellent yields and C-selectivity. Synthetic applications of 4-alkylsyncarpic acids were demonstrated by converting into the functionally rich molecules through different reactions like Michael, retro-Michael, reduction, and oxidation reactions. In a continuation, formal total synthesis of (±)-triumphalone, (±)-isotriumphalone, and monomeric phloroglucinol derivatives was reported in a few steps starting from 4-alkylsyncarpic acids in overall very good yields. Further showcasing the importance of C-alkylated products, 4-benzylsyncarpic acid and its Michael adduct with methyl vinyl ketone were synthesized in a gram scale without compromising rate/yields.
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Affiliation(s)
- Pritam Roy
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - Anugam V Krishna
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
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Zhou T, Zheng A, Huo L, Li C, Tan H, Wang S, Chen H. Total syntheses of ericifolione and its analogues via a biomimetic inverse-electron-demand Diels-Alder reaction. Chem Commun (Camb) 2021; 58:270-273. [PMID: 34878459 DOI: 10.1039/d1cc06361h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Driven by bioinspiration and appreciation of the structure of ericifolione, a biomimetic tautomerization/intermolecular inverse-electron-demand hetero Diels-Alder reaction cascade sequence promoted by sodium acetate to rapidly construct sterically hindered dihydropyran scaffolds was established, which allowed the first straightforward biomimetic total syntheses of ericifolione and its analogues with high simplicity. Moreover, this methodology set the stage for the preparation of relevant natural products or derivatives.
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Affiliation(s)
- Tingting Zhou
- School of Pharmacy and Bioengineering, Chongqing University of Technology, Chongqing 400054, People's Republic of China. .,Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China.
| | - Anquan Zheng
- School of Pharmacy and Bioengineering, Chongqing University of Technology, Chongqing 400054, People's Republic of China. .,Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China.
| | - Luqiong Huo
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China.
| | - Changgeng Li
- School of Pharmacy and Bioengineering, Chongqing University of Technology, Chongqing 400054, People's Republic of China.
| | - Haibo Tan
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China.
| | - Sasa Wang
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China. .,Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Guangxi Collaborative Innovation Centre for Chemistry and Engineering of Forest Products, Guangxi University for Nationalities, Nanning 530006, People's Republic of China
| | - Huiyu Chen
- School of Pharmacy and Bioengineering, Chongqing University of Technology, Chongqing 400054, People's Republic of China. .,School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, People's Republic of China
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5
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Ismail MM, Hassan M, Moawad SS, Okba MM, Ashour RM, Fayek NM, Saber FR. Exploring the Antivirulence Activity of Pulverulentone A, a Phloroglucinol-Derivative from Callistemon citrinus Leaf Extract, against Multi-Drug Resistant Pseudomonas aeruginosa. Antibiotics (Basel) 2021; 10:antibiotics10080907. [PMID: 34438957 PMCID: PMC8388764 DOI: 10.3390/antibiotics10080907] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2021] [Revised: 07/18/2021] [Accepted: 07/21/2021] [Indexed: 12/17/2022] Open
Abstract
(1) Background: Bacterial resistance to antibiotics is a global life-threatening issue. Antivirulence therapy is a promising approach to combat bacterial infections as it disarms the bacteria from their virulence factors with reduced selective pressure and a lower chance of resistance. (2) Methods: Callistemon citrinus leaf extract and its major constituent, Pulverulentone A, were tested for their ability to inhibit biofilm, exopolysaccharides, pyocyanin and proteases produced by MDR P. aeruginosa. In addition, a Galleria mellonella larvae model was employed to evaluate the in vivo cytotoxicity of Pulverulentone A and its ability to combat Pseudomonas infection. Docking study was further performed to investigate Pulverulentone A druggability against main quorum sensing (QS) targets expressed by P. aeruginosa; (3) Results: Both C. citrinus extract and the isolated compound could inhibit biofilm formation, extracellular polymeric substances (EPS) and pigment production by the tested isolates. Unexpectedly, no significant inhibition was observed on proteases production. The in silico docking analysis revealed good interactions of Pulverulentone A with all QS targets examined (LasR, MyfR/PqsR, QscR). Pulverulentone A was safe up to 400 µg·mL−1 in Galleria caterpillars. Moreover, pre-treatment of P. aeruginosa with Pulverulentone A slightly enhanced the survival of the infected larvae. (4) Conclusions: The present study proves Pulverulentone A safety with significant in vitro and in silico antivirulence potential against P. aeruginosa.
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Affiliation(s)
- Maha M. Ismail
- Microbiology and Immunology Department, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt;
- Correspondence: (M.M.I.); (F.R.S.); Tel./Fax: +20-3628426 (ext. 00202) (M.M.I.); Tel.: +20-1004405983 (F.R.S.)
| | - Mariam Hassan
- Microbiology and Immunology Department, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt;
| | - Sawsan S. Moawad
- Department of Pests and Plant Protection, National Research Center (NRC), Giza 12622, Egypt;
| | - Mona M. Okba
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt; (M.M.O.); (R.M.A.); (N.M.F.)
| | - Rehab M. Ashour
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt; (M.M.O.); (R.M.A.); (N.M.F.)
| | - Nesrin M. Fayek
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt; (M.M.O.); (R.M.A.); (N.M.F.)
| | - Fatema R. Saber
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt; (M.M.O.); (R.M.A.); (N.M.F.)
- Correspondence: (M.M.I.); (F.R.S.); Tel./Fax: +20-3628426 (ext. 00202) (M.M.I.); Tel.: +20-1004405983 (F.R.S.)
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6
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Zhang X, Dong C, Wu G, Huo L, Yuan Y, Hu Y, Liu H, Tan H. The Biomimetic Total Syntheses of the Antiplasmodial Tomentosones A and B. Org Lett 2020; 22:8007-8011. [PMID: 33017154 DOI: 10.1021/acs.orglett.0c02943] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The first biomimetic total syntheses of natural phloroglucinols tomentosones A and B and their analogues have been accomplished. The synthetic strategy primarily referred to the potential biosynthetic precursors and their possible sequence of segments assembly by chemological evolution of the structural entities and enabled rapid access of the titled compounds in a practical fashion.
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Affiliation(s)
- Xiao Zhang
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China.,Institute of Tropical Medicine, Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou 510405, People's Republic of China
| | - Chunmao Dong
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China.,Xiangya School of Pharmaceutical Sciences, Central South University, Changsha 410013, People's Republic of China
| | - Guiyun Wu
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China.,Institute of Tropical Medicine, Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou 510405, People's Republic of China
| | - Luqiong Huo
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China.,Guangdong Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, People's Republic of China
| | - Yunfei Yuan
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China
| | - Yingjie Hu
- Institute of Tropical Medicine, Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou 510405, People's Republic of China
| | - Hongxin Liu
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China.,Guangdong Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, People's Republic of China
| | - Haibo Tan
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China.,Xiangya School of Pharmaceutical Sciences, Central South University, Changsha 410013, People's Republic of China
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7
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Shehabeldine AM, Ashour RM, Okba MM, Saber FR. Callistemon citrinus bioactive metabolites as new inhibitors of methicillin-resistant Staphylococcus aureus biofilm formation. JOURNAL OF ETHNOPHARMACOLOGY 2020; 254:112669. [PMID: 32087316 DOI: 10.1016/j.jep.2020.112669] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Revised: 01/17/2020] [Accepted: 02/12/2020] [Indexed: 06/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The development of new inhibitors of bacterial virulence factors from natural origin has recently received significant attention. Callistemon citrinus Skeels is an important plant of great medicinal value. Its antimicrobial activity is well documented. Although several compounds were isolated from this plant, the actual bioactive compounds responsible for its antimicrobial activity are still unrevealed. AIM OF THE STUDY To evaluate the effect of C. citrinus crude extract and isolated compounds on methicillin-resistant and sensitive Staphylococcus aureus. MATERIALS AND METHODS The methylene chloride-methanol extract (MME) of C. citrinus leaves was prepared by Soxhlet apparatus. Biologically guided fractionation of MME was accomplished using several normal and reversed phase silica gel columns. The potency of MME and its isolated compounds against methicillin-resistant Staphylococcus aureus (MRSA) and methicillin-sensitive S. aureus (MSSA) was evaluated. In addition, the mechanism of resistance was studied using three virulence factors; antibiofilm activity, inhibition of staphyloxanthin biosynthesis and effect on acid tolerance. Ultrastructural changes in MRSA and MSSA were observed by TEM to understand mode of action of these compounds. RESULTS Pulverulentone A (C1), 8- desmethyl eucalyptin (C2) and eucalyptin (C3) were isolated from the most bioactive fraction of MME. Confocal scanning laser microscopy images revealed that C. citrinus isolated compounds destroyed the intact architecture of biofilm, thickness and reduced its biomass. Pulverulentone A (C1) showed the most potent anti-biofilm activity up to 71% and 62.3% against MRSA and MSSA, respectively. It also exhibited the highest inhibition of staphyloxanthin biosynthesis of MRSA and MSSA by 55.6% and 54.5%, respectively. The bacterial cell membrane was compromised, losing its integrity and releasing important cellular constituents when exposed to C1-C3 CONCLUSIONS: C. citrinus phenolics and acylphloroglucinols may serve as potential source of plant-based antibacterials and thus could be implicated to control MRSA biofilm formation.
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Affiliation(s)
- Amr M Shehabeldine
- Department of Botany and Microbiology, Faculty of Science (Boys), Al-Azhar University, Nasr City, Cairo, 11884, Egypt.
| | - Rehab M Ashour
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Kasr el-Aini street, Cairo, 11562, Egypt.
| | - Mona M Okba
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Kasr el-Aini street, Cairo, 11562, Egypt.
| | - Fatema R Saber
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Kasr el-Aini street, Cairo, 11562, Egypt.
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8
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Rhodomyrtus tomentosa (Aiton.): A review of phytochemistry, pharmacology and industrial applications research progress. Food Chem 2020; 309:125715. [DOI: 10.1016/j.foodchem.2019.125715] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 10/05/2019] [Accepted: 10/14/2019] [Indexed: 12/16/2022]
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9
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Zhang X, Wu G, Huo L, Guo X, Qiu S, Liu H, Tan H, Hu Y. The First Racemic Total Syntheses of the Antiplasmodials Watsonianones A and B and Corymbone B. JOURNAL OF NATURAL PRODUCTS 2020; 83:3-7. [PMID: 31721580 DOI: 10.1021/acs.jnatprod.8b01077] [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
The first biomimetic total syntheses of three biologically meaningful acylphloroglucinols, watsonianones A and B and corymbone B, with potent antiplasmodial activity, were performed. Their total syntheses were carried out through a diversity-oriented synthetic strategy from congener 2,2,4,4-tetramethyl-6-(3-methylbutylidene)cyclohexane-1,3,5-trione with high step efficiency. The spontaneous enolization/air oxidation of the precursor 2,2,4,4-tetramethyl-6-(3-methylbutylidene)cyclohexane-1,3,5-trione through a singlet O2-induced Diels-Alder reaction pathway to assemble the key biosynthetic peroxide intermediate is also discussed.
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Affiliation(s)
- Xiao Zhang
- Institute of Tropical Medicine , Guangzhou University of Chinese Medicine , Guangzhou 510405 , People's Republic of China
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany , South China Botanical Garden, Chinese Academy of Sciences , Guangzhou 510650 , People's Republic of China
| | - Guiyun Wu
- Institute of Tropical Medicine , Guangzhou University of Chinese Medicine , Guangzhou 510405 , People's Republic of China
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany , South China Botanical Garden, Chinese Academy of Sciences , Guangzhou 510650 , People's Republic of China
| | - Luqiong Huo
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany , South China Botanical Garden, Chinese Academy of Sciences , Guangzhou 510650 , People's Republic of China
| | - Xueying Guo
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany , South China Botanical Garden, Chinese Academy of Sciences , Guangzhou 510650 , People's Republic of China
| | - Shengxiang Qiu
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany , South China Botanical Garden, Chinese Academy of Sciences , Guangzhou 510650 , People's Republic of China
| | - Hongxin Liu
- State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Open Laboratory of Applied Microbiology , Guangdong Institute of Microbiology , Guangzhou 510070 , People's Republic of China
| | - Haibo Tan
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany , South China Botanical Garden, Chinese Academy of Sciences , Guangzhou 510650 , People's Republic of China
| | - Yingjie Hu
- Institute of Tropical Medicine , Guangzhou University of Chinese Medicine , Guangzhou 510405 , People's Republic of China
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10
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Shi L, Wang S, Huo L, Gao M, Zhang W, Lu X, Qiu S, Liu H, Tan H. Diastereoselective construction of the benzannulated spiroketal core of chaetoquadrins enabled by a regiodivergent cascade. Org Chem Front 2020. [DOI: 10.1039/d0qo00484g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A remarkable acid-mediated methodology for the regiodivergent construction of a biologically interesting tricyclic benzannulated-spiroketal skeleton with diastereomeric specificity was uncovered to efficiently access analogs of chaetoquadrins .
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Affiliation(s)
- Lili Shi
- Program for Natural Products Chemical Biology
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization
- Guangdong Provincial Key Laboratory of Applied Botany
- South China Botanical Garden
- Chinese Academy of Sciences
| | - Sasa Wang
- School of Chemical Biology and Biotechnology
- Peking University Shenzhen Graduate School
- Shenzhen 518055
- China
- Guangxi Key Laboratory of Chemistry and Engineering of Forest Products
| | - Luqiong Huo
- Program for Natural Products Chemical Biology
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization
- Guangdong Provincial Key Laboratory of Applied Botany
- South China Botanical Garden
- Chinese Academy of Sciences
| | - Minli Gao
- Program for Natural Products Chemical Biology
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization
- Guangdong Provincial Key Laboratory of Applied Botany
- South China Botanical Garden
- Chinese Academy of Sciences
| | - Wenge Zhang
- Program for Natural Products Chemical Biology
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization
- Guangdong Provincial Key Laboratory of Applied Botany
- South China Botanical Garden
- Chinese Academy of Sciences
| | - Xiuxiang Lu
- Program for Natural Products Chemical Biology
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization
- Guangdong Provincial Key Laboratory of Applied Botany
- South China Botanical Garden
- Chinese Academy of Sciences
| | - Shengxiang Qiu
- Program for Natural Products Chemical Biology
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization
- Guangdong Provincial Key Laboratory of Applied Botany
- South China Botanical Garden
- Chinese Academy of Sciences
| | - Hongxin Liu
- Program for Natural Products Chemical Biology
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization
- Guangdong Provincial Key Laboratory of Applied Botany
- South China Botanical Garden
- Chinese Academy of Sciences
| | - Haibo Tan
- Program for Natural Products Chemical Biology
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization
- Guangdong Provincial Key Laboratory of Applied Botany
- South China Botanical Garden
- Chinese Academy of Sciences
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11
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Gatadi S, Madhavi YV, Chopra S, Nanduri S. Promising antibacterial agents against multidrug resistant Staphylococcus aureus. Bioorg Chem 2019; 92:103252. [PMID: 31518761 DOI: 10.1016/j.bioorg.2019.103252] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 08/10/2019] [Accepted: 09/04/2019] [Indexed: 12/11/2022]
Abstract
Rapid emergence of multidrug resistant Staphylococcus aureus infections has created a critical health menace universally. Resistance to all the available chemotherapeutics has been on rise which led to WHO to stratify Staphylococcus aureus as high tier priorty II pathogen. Hence, discovery and development of new antibacterial agents with new mode of action is crucial to address the multidrug resistant Staphylococcus aureus infections. The egressing understanding of new antibacterials on their biological target provides opportunities for new therapeutic agents. This review underlines on various aspects of drug design, structure activity relationships (SARs) and mechanism of action of various new antibacterial agents and also covers the recent reports on new antibacterial agents with potent activity against multidrug resistant Staphylococcus aureus. This review provides attention on in vitro and in vivo pharmacological activities of new antibacterial agents in the point of view of drug discovery and development.
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Affiliation(s)
- Srikanth Gatadi
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad 500037, India
| | - Y V Madhavi
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad 500037, India
| | - Sidharth Chopra
- Division of Microbiology, CSIR-Central Drug Research Institute, Sitapur Road, Sector 10, Janakipuram Extension, Lucknow 226031, Uttar Pradesh, India
| | - Srinivas Nanduri
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad 500037, India.
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12
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Gatadi S, Gour J, Nanduri S. Natural product derived promising anti-MRSA drug leads: A review. Bioorg Med Chem 2019; 27:3760-3774. [DOI: 10.1016/j.bmc.2019.07.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 07/07/2019] [Accepted: 07/11/2019] [Indexed: 12/20/2022]
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13
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Wu JW, Li BL, Tang C, Ke CQ, Zhu NL, Qiu SX, Ye Y. Callistemonols A and B, Potent Antimicrobial Acylphloroglucinol Derivatives with Unusual Carbon Skeletons from Callistemon viminalis. JOURNAL OF NATURAL PRODUCTS 2019; 82:1917-1922. [PMID: 31276403 DOI: 10.1021/acs.jnatprod.9b00064] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A phytochemical investigation on the leaves of Callistemon viminalis resulted in the isolation of two unusual compounds, callistemonols A (1) and B (2). Callistemonol A (1) possesses a novel skeleton of a furan ring fusing both an α,β-triketone and a phloroglucinol unit, while callistemonol B (2) is an acylphloroglucinol derivative featuring two methyl substituents on a five-membered ring and an isovaleryl side chain. Their structures were fully characterized on the basis of extensive spectroscopic analysis, including 1D and 2D NMR parameters, as well as the IR and HRESIMS data. Callistemonol A (1) represents an example of a natural dibenzofuran with two phenyl moieties, and a plausible biogenetic pathway to generate this novel dibenzofuran through a C-C bond-forming radical SAM enzyme is proposed. Moreover, antimicrobial assays, in conjunction with time-killing and biophysical studies, revealed that 1 and 2 exert potent bactericidal activities against a panel of methicillin-resistant pathogenic microbes.
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Affiliation(s)
- Jie-Wei Wu
- Mathematical Engineering Academy of Chinese Medicine , Guangzhou University of Chinese Medicine , Guangzhou 510006 , People's Republic of China
- State Key Laboratory of Drug Research, & Natural Products Chemistry Department , Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai 201203 , People's Republic of China
| | - Bai-Lin Li
- Mathematical Engineering Academy of Chinese Medicine , Guangzhou University of Chinese Medicine , Guangzhou 510006 , People's Republic of China
| | - Chunping Tang
- State Key Laboratory of Drug Research, & Natural Products Chemistry Department , Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai 201203 , People's Republic of China
| | - Chang-Qiang Ke
- State Key Laboratory of Drug Research, & Natural Products Chemistry Department , Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai 201203 , People's Republic of China
| | - Nan-Lin Zhu
- State Key Laboratory of Drug Research, & Natural Products Chemistry Department , Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai 201203 , People's Republic of China
| | - Sheng-Xiang Qiu
- Program for Natural Product Chemical Biology, Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany , South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650 , People's Republic of China
| | - Yang Ye
- State Key Laboratory of Drug Research, & Natural Products Chemistry Department , Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai 201203 , People's Republic of China
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Qin XJ, Rauwolf TJ, Li PP, Liu H, McNeely J, Hua Y, Liu HY, Porco JA. Isolation and Synthesis of Novel Meroterpenoids from Rhodomyrtus tomentosa: Investigation of a Reactive Enetrione Intermediate. Angew Chem Int Ed Engl 2019; 58:4291-4296. [PMID: 30681258 PMCID: PMC6583783 DOI: 10.1002/anie.201814421] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Indexed: 01/19/2023]
Abstract
Rhodomyrtusials A-C, the first examples of triketone-sesquiterpene meroterpenoids featuring a unique 6/5/5/9/4 fused pentacyclic ring system were isolated from Rhodomyrtus tomentosa, along with several biogenetically-related dihydropyran isomers. Two bis-furans and one dihydropyran isomer showed acetylcholinesterase (AChE) inhibitory activity. Structures of the isolates were unambiguously established by a combination of spectroscopic data, ECD analysis, and total synthesis. Bioinspired total syntheses of six isolates were achieved in six steps utilizing a reactive enetrione intermediate generated in situ from a readily available hydroxy-endoperoxide precursor.
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Affiliation(s)
- Xu-Jie Qin
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences Kunming 650201 (P. R. China)
| | - Tyler J. Rauwolf
- Department of Chemistry, Center for Molecular Discovery (BUCMD), Boston University 590 Commonwealth Avenue, Boston, MA 02215 (USA)
| | - Pan-Pan Li
- College of Forestry, Southwest Forestry University Kunming 650224 (P. R. China)
| | - Hui Liu
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences Kunming 650201 (P. R. China)
| | - James McNeely
- Department of Chemistry, Center for Molecular Discovery (BUCMD), Boston University 590 Commonwealth Avenue, Boston, MA 02215 (USA)
| | - Yan Hua
- College of Forestry, Southwest Forestry University Kunming 650224 (P. R. China)
| | - Hai-Yang Liu
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences Kunming 650201 (P. R. China)
| | - John A. Porco
- Department of Chemistry, Center for Molecular Discovery (BUCMD), Boston University 590 Commonwealth Avenue, Boston, MA 02215 (USA)
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15
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Unusual substrate and halide versatility of phenolic halogenase PltM. Nat Commun 2019; 10:1255. [PMID: 30890712 PMCID: PMC6424973 DOI: 10.1038/s41467-019-09215-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Accepted: 02/26/2019] [Indexed: 12/02/2022] Open
Abstract
Controlled halogenation of chemically versatile substrates is difficult to achieve. Here we describe a unique flavin-dependent halogenase, PltM, which is capable of utilizing a wide range of halides for installation on a diverse array of phenolic compounds, including FDA-approved drugs and natural products, such as terbutaline, fenoterol, resveratrol, and catechin. Crystal structures of PltM in complex with phloroglucinol and FAD in different states yield insight into substrate recognition and the FAD recycling mechanism of this halogenase. Halogenase enzymes are of interest as halogenating tools for organic synthesis. Here the authors show that the bacterial FAD-dependent phenolic halogenase PltM chlorinates, brominates and iodinates a variety of substrates and reveal the structural basis for its substrate versatility and provide insights into the FAD recycling mechanism of PltM.
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16
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Qin X, Rauwolf TJ, Li P, Liu H, McNeely J, Hua Y, Liu H, Porco JA. Isolation and Synthesis of Novel Meroterpenoids from
Rhodomyrtus tomentos
a: Investigation of a Reactive Enetrione Intermediate. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201814421] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Xu‐Jie Qin
- State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of Botany Chinese Academy of Sciences Kunming 650201 P. R. China
| | - Tyler J. Rauwolf
- Department of Chemistry Center for Molecular Discovery (BU-CMD) Boston University 590 Commonwealth Avenue Boston MA 02215 USA
| | - Pan‐Pan Li
- College of Forestry Southwest Forestry University Kunming 650224 P. R. China
| | - Hui Liu
- State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of Botany Chinese Academy of Sciences Kunming 650201 P. R. China
| | - James McNeely
- Department of Chemistry Center for Molecular Discovery (BU-CMD) Boston University 590 Commonwealth Avenue Boston MA 02215 USA
| | - Yan Hua
- College of Forestry Southwest Forestry University Kunming 650224 P. R. China
| | - Hai‐Yang Liu
- State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of Botany Chinese Academy of Sciences Kunming 650201 P. R. China
| | - John A. Porco
- Department of Chemistry Center for Molecular Discovery (BU-CMD) Boston University 590 Commonwealth Avenue Boston MA 02215 USA
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17
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Zhao LY, Liu HX, Wang L, Xu ZF, Tan HB, Qiu SX. Rhodomyrtosone B, a membrane-targeting anti-MRSA natural acylgphloroglucinol from Rhodomyrtus tomentosa. JOURNAL OF ETHNOPHARMACOLOGY 2019; 228:50-57. [PMID: 30195566 DOI: 10.1016/j.jep.2018.09.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2017] [Revised: 07/30/2018] [Accepted: 09/05/2018] [Indexed: 06/08/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The leaves of Rhodomyrtus tomentosa are traditionally used in the treatment of infectious diseases such as wound infections in Chinese traditional medicine. The mechanisms of the activity of rhodomyrtosone B (RDSB), a natural acylphloroglucinol isolated from the leaves of Rhodomyrtus tomentosa, are still not understood. We provided a detailed investigation of the antibacterial action of RDSB against bacteria in vitro and in vivo. MATERIALS AND METHODS The antibacterial activity of RDSB was tested by the microdilution method against a panel of bacteria, and a time-killing assay was carried out according to CLSI guidelines. The cytotoxic potential of RDSB was evaluated against mammalian cells, and its haemolytic activity towards rabbit red blood cells (RBCs) was assessed. The mode of action of RDSB was investigated by targeting bacterial membranes, and its resistance was evaluated using a sequential passaging method. The antibacterial activities in vivo were assessed against MRSA in a mouse skin infection mode. RESULTS RDSB exhibited distinct antibacterial activities against selected Gram-positive pathogens responsible for serious infections, even including methicillin-resistant Staphylococcus aureus (MRSA) with a minimum inhibitory concentration (MIC) of 0.62-1.25 µg/mL and vancomycin-resistant Enterococcus faecium (VRE) with an MIC of 2.5 µg/mL. RDSB displayed much more rapid bactericidal activity against MRSA than that of vancomycin. The membrane-targeting experiments revealed that RDSB exhibited significant antibacterial activity with the perturbation of bacterial membrane potential and an increase in membrane permeability. In particular, RDSB had weak cytotoxicity to mammalian cells (IC50 >14 µg/mL) and has advantageous specificity against selected Gram-positive bacterial membranes rather than RBCs. Notably, RDSB displayed in vitro antibacterial activities against MRSA without drug-resistance and profoundly attenuated the skin ulcer formation in a murine model of MRSA infection under a single dose of 40 µg RDSB per mouse. CONCLUSION RDSB has profound antibacterial activity against drug-resistant bacteria (MRSA and VRE) and low cytotoxicity. It is bactericidal in nature, and an increase in membrane permeability resulting from membrane perturbation is one of its modes of action. RDSB represents a promising natural antibiotic to combat drug-resistant (MRSA and VRE) infections.
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Affiliation(s)
- Li-Yun Zhao
- Program for Natural Product Chemical Biology, Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China; University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Hong-Xin Liu
- Program for Natural Product Chemical Biology, Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China
| | - Lei Wang
- Institute of Hypertension, School of Medicine, Sun Yat-Sen University, Guangzhou 510085, People's Republic of China
| | - Zhi-Fang Xu
- Program for Natural Product Chemical Biology, Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China
| | - Hai-Bo Tan
- Program for Natural Product Chemical Biology, Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China.
| | - Sheng-Xiang Qiu
- Program for Natural Product Chemical Biology, Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China.
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18
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Structures and Bioactive Properties of Myrtucommulones and Related Acylphloroglucinols from Myrtaceae. Molecules 2018; 23:molecules23123370. [PMID: 30572614 PMCID: PMC6321051 DOI: 10.3390/molecules23123370] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2018] [Revised: 12/14/2018] [Accepted: 12/17/2018] [Indexed: 12/13/2022] Open
Abstract
Myrtaceae are a group of plants that include a number of renowned species used in ethnomedicine in many areas worldwide. Their valuable therapeutic properties have stimulated a fruitful research activity addressed to the identification of the bioactive components of their extracts yielding a great diversity of terpenes; polyphenols; and other exclusive products. Among the latter, starting with the discovery of myrtucommulone A from myrtle (Myrtus communis), a series of structurally-related acylphloroglucinol compounds have been characterized from several species that represent the basic active principles to be considered in view of possible drug development. Aspects concerning chemical and biological properties of these products are reviewed in the present paper.
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19
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Zhao L, Liu H, Huo L, Wang M, Yang B, Zhang W, Xu Z, Tan H, Qiu SX. Structural optimization and antibacterial evaluation of rhodomyrtosone B analogues against MRSA strains. MEDCHEMCOMM 2018; 9:1698-1707. [PMID: 30429974 PMCID: PMC6195101 DOI: 10.1039/c8md00257f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 08/09/2018] [Indexed: 11/21/2022]
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) infections are well-known as a significant global health challenge. In this study, twenty-two congeners of the natural antibiotic rhodomyrtosone B (RDSB) were synthesized with the aim of specifically enhancing the structural diversity through modifying the pendant acyl moiety. The structure-activity relationship study against various MRSA strains revealed that a suitable hydrophobic acyl tail in the phloroglucinol scaffold is a prerequisite for antibacterial activity. Notably, RDSB analogue 11k was identified as a promising lead compound with significant in vitro and in vivo antibacterial activities against a panel of hospital mortality-relevant MRSA strains. Moreover, compound 11k possessed other potent advantages, including breadth of the antibacterial spectrum, rapidity of bactericidal action, and excellent membrane selectivity. The mode of action study of compound 11k at the biophysical and morphology levels disclosed that 11k exerted its MRSA bactericidal action by membrane superpolarization resulting in cell lysis and membrane disruption. Collectively, the presented results indicate that the novel modified RDSB analogue 11k warrants further exploration as a promising candidate for the treatment of MRSA infections.
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Affiliation(s)
- Liyun Zhao
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization , South China Botanical Garden , Chinese Academy of Sciences , Guangzhou , 510650 , People's Republic of China . ;
- University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Hongxin Liu
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization , South China Botanical Garden , Chinese Academy of Sciences , Guangzhou , 510650 , People's Republic of China . ;
- State Key Laboratory of Applied Microbiology Southern China , Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application , Guangdong Open Laboratory of Applied Microbiology , Guangdong Institute of Microbiology , Guangzhou 510070 , People's Republic of China
| | - Luqiong Huo
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization , South China Botanical Garden , Chinese Academy of Sciences , Guangzhou , 510650 , People's Republic of China . ;
- University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Miaomiao Wang
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization , South China Botanical Garden , Chinese Academy of Sciences , Guangzhou , 510650 , People's Republic of China . ;
- University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Bao Yang
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization , South China Botanical Garden , Chinese Academy of Sciences , Guangzhou , 510650 , People's Republic of China . ;
| | - Weimin Zhang
- State Key Laboratory of Applied Microbiology Southern China , Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application , Guangdong Open Laboratory of Applied Microbiology , Guangdong Institute of Microbiology , Guangzhou 510070 , People's Republic of China
| | - Zhifang Xu
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization , South China Botanical Garden , Chinese Academy of Sciences , Guangzhou , 510650 , People's Republic of China . ;
| | - Haibo Tan
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization , South China Botanical Garden , Chinese Academy of Sciences , Guangzhou , 510650 , People's Republic of China . ;
| | - Sheng-Xiang Qiu
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization , South China Botanical Garden , Chinese Academy of Sciences , Guangzhou , 510650 , People's Republic of China . ;
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20
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Su JC, Wang S, Cheng W, Huang XJ, Li MM, Jiang RW, Li YL, Wang L, Ye WC, Wang Y. Phloroglucinol Derivatives with Unusual Skeletons from Cleistocalyx operculatus and Their in Vitro Antiviral Activity. J Org Chem 2018; 83:8522-8532. [PMID: 29963868 DOI: 10.1021/acs.joc.8b01050] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Four novel phloroglucinol derivatives (1-4) featuring a 2,4-dimethyl-cinnamyl-phloroglucinol moiety, along with their putative biosynthetic precursors 5 and 6, were isolated from the leaves of Cleistocalyx operculatus. Compounds 1 and 2 are two pairs of new enantiomeric phloroglucinol dimers possessing an unprecedented polycyclic skeleton with a highly functionalized dihydropyrano[3,2- d]xanthene tetracyclic core. Compounds 3 and 4 are two new phloroglucinol-terpene adducts (PTAs) with a novel carbon skeleton. The structures of 1-4 including their absolute configurations were unambiguously accomplished by combination of extensive spectroscopic analyses, X-ray crystallography, and quantum chemical ECD calculations. A hypothetical biosynthetic pathway for 1-4 was also proposed. Compound 1 exhibited a promising in vitro antiherpes simplex virus type-1 (HSV-1) effect.
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Affiliation(s)
- Jun-Cheng Su
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy , Jinan University , Guangzhou 510632 , People's Republic of China.,Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research , Jinan University , Guangzhou 510632 , People's Republic of China
| | - Shan Wang
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy , Jinan University , Guangzhou 510632 , People's Republic of China.,Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research , Jinan University , Guangzhou 510632 , People's Republic of China
| | - Wen Cheng
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy , Jinan University , Guangzhou 510632 , People's Republic of China
| | - Xiao-Jun Huang
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy , Jinan University , Guangzhou 510632 , People's Republic of China.,Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research , Jinan University , Guangzhou 510632 , People's Republic of China
| | - Man-Mei Li
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy , Jinan University , Guangzhou 510632 , People's Republic of China
| | - Ren-Wang Jiang
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy , Jinan University , Guangzhou 510632 , People's Republic of China
| | - Yao-Lan Li
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy , Jinan University , Guangzhou 510632 , People's Republic of China
| | - Lei Wang
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy , Jinan University , Guangzhou 510632 , People's Republic of China.,Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research , Jinan University , Guangzhou 510632 , People's Republic of China
| | - Wen-Cai Ye
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy , Jinan University , Guangzhou 510632 , People's Republic of China.,Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research , Jinan University , Guangzhou 510632 , People's Republic of China
| | - Ying Wang
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy , Jinan University , Guangzhou 510632 , People's Republic of China.,Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research , Jinan University , Guangzhou 510632 , People's Republic of China
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21
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Charpentier M, Jauch J. Metal catalysed versus organocatalysed stereoselective synthesis: The concrete case of myrtucommulones. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.10.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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22
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Design, synthesis and biological evaluation of amino organophosphorus imidazoles as a new type of potential antimicrobial agents. Sci China Chem 2017. [DOI: 10.1007/s11426-016-9009-6] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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