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Sue K, Cadelis MM, Hainsworth K, Rouvier F, Bourguet-Kondracki ML, Brunel JM, Copp BR. Preliminary SAR of Novel Pleuromutilin-Polyamine Conjugates. Microorganisms 2023; 11:2791. [PMID: 38004802 PMCID: PMC10673369 DOI: 10.3390/microorganisms11112791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 11/03/2023] [Accepted: 11/13/2023] [Indexed: 11/26/2023] Open
Abstract
While pleuromutilin (1) and its clinically available derivatives (2-6) are highly effective against Gram-positive bacteria, they remain inactive against many pathogenic Gram-negative bacteria due to the efflux pump AcrAB-TolC. In an effort to broaden the spectrum of activity of pleuromutilin (1), we developed a series of novel pleuromutilin-polyamine conjugates (9a-f) which exhibited promising intrinsic antimicrobial properties, targeting both Gram-positive and Gram-negative bacteria, including Staphylococcus aureus, methicillin-resistant S. aureus (MRSA), and Escherichia coli, along with the fungal strain Cryptococcus neoformans, and were devoid of cytotoxic and hemolytic properties with the exception of one conjugate. Furthermore, this series displayed moderate to low antibiotic potentiation of legacy antibiotics doxycycline and erythromycin, with three conjugates enhancing the activity four-fold in combination with doxycycline. In comparison to pleuromutilin (1) and tiamulin (2), one of the conjugates exhibited an expanded spectrum of activity, including Gram-negative bacteria and fungi, making it a promising option for combating microbial infections.
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Affiliation(s)
- Kenneth Sue
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Melissa M. Cadelis
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
- School of Medical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Kerrin Hainsworth
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Florent Rouvier
- Membranes et Cibles Thérapeutiques, INSERM, Aix-Marseille Universite, 27 bd Jean Moulin, 13385 Marseille, France
| | - Marie-Lise Bourguet-Kondracki
- Laboratoire Molécules de Communication et Adaptation des Micro-organismes, UMR 7245 CNRS, Muséum National d’Histoire Naturelle, 57 rue Cuvier (C.P. 54), 75005 Paris, France
| | - Jean Michel Brunel
- Membranes et Cibles Thérapeutiques, INSERM, Aix-Marseille Universite, 27 bd Jean Moulin, 13385 Marseille, France
| | - Brent R. Copp
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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Cadelis MM, Copp BR. Marine pyridoacridine, pyridoacridone and pyrroloacridine alkaloids. Alkaloids Chem Biol 2023; 90:97-157. [PMID: 37716797 DOI: 10.1016/bs.alkal.2023.06.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/18/2023]
Abstract
The families of pyridoacridine, pyridoacridone, and pyrroloacridine alkaloids are fascinating classes of natural products that have attracted the attention of chemists for over 80 years. Since the first purification of a brightly colored molecule isolated from the sea anemone Calliactis parasitica in 1940, over 110 examples of these alkaloids have been reported from marine organisms. While the paucity of numbers of protons relative to carbons and nitrogens in these molecules presents challenges in structure solution, the chemist is rewarded by their bright pigmented colors and typically diverse biological activities. In the past, several authors have proposed biosynthetic relationships within the pyridoacridine family of alkaloids, formulating a family tree derived from the reaction of dopaminequinone and kynuramine to tie together over 75 alkaloids. Inclusion of two additional quinones, and one homologous diamine, building blocks, for which there is biomimetic synthesis support, is suggestive of a more expansive connected biogenesis that encompasses not only pyridoacridines, but also pyridoacridone, and pyrroloacridine alkaloids. This review covers the isolation, structure elucidation, and proposed biosynthesis and biogenesis of pyridoacridine, pyridoacridone and pyrroloacridine marine alkaloids published to the end of 2022. Biomimetic or bio-inspired syntheses of the compound classes are described and new biological activities reported since 2004 are updated.
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Affiliation(s)
- Melissa M Cadelis
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand
| | - Brent R Copp
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
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Sue K, Cadelis MM, Gill ES, Rouvier F, Bourguet-Kondracki ML, Brunel JM, Copp BR. Indole-3-Acetamido-Polyamines as Antimicrobial Agents and Antibiotic Adjuvants. Biomolecules 2023; 13:1226. [PMID: 37627291 PMCID: PMC10452110 DOI: 10.3390/biom13081226] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 07/27/2023] [Accepted: 08/04/2023] [Indexed: 08/27/2023] Open
Abstract
The widespread incidence of antimicrobial resistance necessitates the discovery of new classes of antimicrobials as well as adjuvant molecules that can restore the action of ineffective antibiotics. Herein, we report the synthesis of a new class of indole-3-acetamido-polyamine conjugates that were evaluated for antimicrobial activities against a panel of bacteria and two fungi, and for the ability to enhance the action of doxycycline against Pseudomonas aeruginosa and erythromycin against Escherichia coli. Compounds 14b, 15b, 17c, 18a, 18b, 18d, 19b, 19e, 20c and 20d exhibited strong growth inhibition of methicillin-resistant Staphylococcus aureus (MRSA) and Cryptococcus neoformans, with minimum inhibitory concentrations (MIC) typically less than 0.2 µM. Four analogues, including a 5-bromo 15c and three 5-methoxyls 16d-f, also exhibited intrinsic activity towards E. coli. Antibiotic kill curve analysis of 15c identified it to be a bactericide. While only one derivative was found to (weakly) enhance the action of erythromycin against E. coli, three examples, including 15c, were found to be strong enhancers of the antibiotic action of doxycycline against P. aeruginosa. Collectively, these results highlight the promising potential of α,ω-disubstituted indole-3-acetamido polyamine conjugates as antimicrobials and antibiotic adjuvants.
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Affiliation(s)
- Kenneth Sue
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Melissa M. Cadelis
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
- School of Medical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Evangelene S. Gill
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Florent Rouvier
- Membranes et Cibles Thérapeutiques (MCT), L’Institut National de la Santé et de la Recherche Médicale (INSERM), Aix-Marseille Universite, 27 bd Jean Moulin, 13385 Marseille, France
| | - Marie-Lise Bourguet-Kondracki
- Laboratoire Molécules de Communication et Adaptation des Micro-Organismes, UMR 7245 CNRS, Muséum National d’Histoire Naturelle, 57 Rue Cuvier (C.P. 54), 75005 Paris, France
| | - Jean Michel Brunel
- Membranes et Cibles Thérapeutiques (MCT), L’Institut National de la Santé et de la Recherche Médicale (INSERM), Aix-Marseille Universite, 27 bd Jean Moulin, 13385 Marseille, France
| | - Brent R. Copp
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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Cadelis MM, Kim J, Rouvier F, Gill ES, Fraser K, Bourguet-Kondracki ML, Brunel JM, Copp BR. Exploration of Bis-Cinnamido-Polyamines as Intrinsic Antimicrobial Agents and Antibiotic Enhancers. Biomolecules 2023; 13:1087. [PMID: 37509123 PMCID: PMC10377643 DOI: 10.3390/biom13071087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 06/26/2023] [Accepted: 07/05/2023] [Indexed: 07/30/2023] Open
Abstract
The marine natural product ianthelliformisamine C is a bis-cinnamido substituted spermine derivative that exhibits intrinsic antimicrobial properties and can enhance the action of doxycycline towards the Gram-negative bacterium Pseudomonas aeruginosa. As part of a study to explore the structure-activity requirements of these activities, we have synthesized a set of analogues that vary in the presence/absence of methoxyl group and bromine atoms and in the polyamine chain length. Intrinsic antimicrobial activity towards Staphylococcus aureus, methicillin-resistant S. aureus (MRSA) and the fungus Cryptococcus neoformans was observed for only the longest polyamine chain examples of non-brominated analogues while all examples bearing either one or two bromine atoms were active. Weak to no activity was typically observed towards Gram-negative bacteria, with exceptions being the longest polyamine chain examples 13f, 14f and 16f against Escherichia coli (MIC 1.56, 7.2 and 5.3 µM, respectively). Many of these longer polyamine-chain analogues also exhibited cytotoxic and/or red blood cell hemolytic properties, diminishing their potential as antimicrobial lead compounds. Two of the non-toxic, non-halogenated analogues, 13b and 13d, exhibited a strong ability to enhance the action of doxycycline against P. aeruginosa, with >64-fold and >32-fold enhancement, respectively. These results suggest that any future efforts to optimize the antibiotic-enhancing properties of cinnamido-polyamines should explore a wider range of aromatic ring substituents that do not include bromine or methoxyl groups.
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Affiliation(s)
- Melissa M Cadelis
- Department of Molecular Medicine and Pathology, School of Medical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Jisoo Kim
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Florent Rouvier
- Membranes et Cibles Therapeutiques (MCT), SSA, INSERM, Aix-Marseille Universite, 27 bd Jean Moulin, 13385 Marseille, France
| | - Evangelene S Gill
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Kyle Fraser
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Marie-Lise Bourguet-Kondracki
- Laboratoire Molécules de Communication et Adaptation des Micro-Organismes, UMR 7245 CNRS, Muséum National d'Histoire Naturelle, 57 Rue Cuvier (C.P. 54), 75005 Paris, France
| | - Jean Michel Brunel
- Membranes et Cibles Therapeutiques (MCT), SSA, INSERM, Aix-Marseille Universite, 27 bd Jean Moulin, 13385 Marseille, France
| | - Brent R Copp
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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Cadelis MM, Edmeades LR, Chen D, Gill ES, Fraser K, Rouvier F, Bourguet-Kondracki ML, Brunel JM, Copp BR. Investigation of Naphthyl-Polyamine Conjugates as Antimicrobials and Antibiotic Enhancers. Antibiotics (Basel) 2023; 12:1014. [PMID: 37370335 DOI: 10.3390/antibiotics12061014] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 06/01/2023] [Accepted: 06/02/2023] [Indexed: 06/29/2023] Open
Abstract
As part of our search for new antimicrobials and antibiotic enhancers, a series of naphthyl- and biphenyl-substituted polyamine conjugates have been synthesized. The structurally-diverse library of compounds incorporated variation in the capping end groups and in the length of the polyamine (PA) core. Longer chain (PA-3-12-3) variants containing both 1-naphthyl and 2-naphthyl capping groups exhibited more pronounced intrinsic antimicrobial properties against methicillin-resistant Staphylococcus aureus (MRSA) (MIC ≤ 0.29 µM) and the fungus Cryptococcus neoformans (MIC ≤ 0.29 µM). Closer mechanistic study of one of these analogues, 20f, identified it as a bactericide. In contrast to previously reported diarylacyl-substituted polyamines, several examples in the current set were able to enhance the antibiotic action of doxycycline and/or erythromycin towards the Gram-negative bacteria Pseudomonas aeruginosa and Escherichia coli. Two analogues (19a and 20c) were of note, exhibiting greater than 32-fold enhancement in activity. This latter result suggests that α,ω-disubstituted polyamines bearing 1-naphthyl- and 2-naphthyl-capping groups are worthy of further investigation and optimization as non-toxic antibiotic enhancers.
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Affiliation(s)
- Melissa M Cadelis
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
- School of Medical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Liam R Edmeades
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Dan Chen
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Evangelene S Gill
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Kyle Fraser
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Florent Rouvier
- Membranes et Cibles Thérapeutiques (MCT), SSA, INSERM, Aix-Marseille Universite, 27 bd Jean Moulin, 13385 Marseille, France
| | - Marie-Lise Bourguet-Kondracki
- Laboratoire Molécules de Communication et Adaptation des Micro-organismes, UMR 7245 CNRS, Muséum National d'Histoire Naturelle, 57 rue Cuvier (C.P. 54), 75005 Paris, France
| | - Jean Michel Brunel
- Membranes et Cibles Thérapeutiques (MCT), SSA, INSERM, Aix-Marseille Universite, 27 bd Jean Moulin, 13385 Marseille, France
| | - Brent R Copp
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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Cadelis MM, Liu T, Sue K, Rouvier F, Bourguet-Kondracki ML, Brunel JM, Copp BR. Structure-Activity Relationship Studies of Indolglyoxyl-Polyamine Conjugates as Antimicrobials and Antibiotic Potentiators. Pharmaceuticals (Basel) 2023; 16:823. [PMID: 37375770 DOI: 10.3390/ph16060823] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 05/25/2023] [Accepted: 05/29/2023] [Indexed: 06/29/2023] Open
Abstract
Antibiotic resistance is a growing global health threat, requiring urgent attention. One approach to overcome antibiotic resistance is to discover and develop new antibiotic enhancers, molecules that work with legacy antibiotics to enhance their efficacy against resistant bacteria. Our previous screening of a library of purified marine natural products and their synthetic analogues led to the discovery of an indolglyoxyl-spermine derivative that exhibited intrinsic antimicrobial properties and was also able to potentiate the action of doxycycline towards the difficult to treat, Gram-negative bacterium Pseudomonas aeruginosa. A set of analogues have now been prepared, exploring the influence of indole substitution at the 5- and 7- positions and length of the polyamine chain on biological activity. While limiting cytotoxicity and/or hemolytic activities were observed for many analogues, two 7-methyl substituted analogues (23b and 23c) were found to exhibit strong activity towards Gram-positive bacteria with no detectable cytotoxicity or hemolytic properties. Different molecular attributes were required for antibiotic enhancing properties, with one example identified, a 5-methoxy-substitiuted analogue (19a), as being a non-toxic, non-hemolytic enhancer of the action of two tetracycline antibiotics, doxycycline and minocycline, towards P. aeruginosa. These results provide further stimulation for the search for novel antimicrobials and antibiotic enhancers amongst marine natural products and related synthetic analogues.
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Affiliation(s)
- Melissa M Cadelis
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
- School of Medical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Tim Liu
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Kenneth Sue
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Florent Rouvier
- UMR MD1 "Membranes et Cibles Thérapeutiques", U1261 INSERM, Faculté de Pharmacie, Aix-Marseille Université, 27 bd Jean Moulin, 13385 Marseille, France
| | - Marie-Lise Bourguet-Kondracki
- Laboratoire Molécules de Communication et Adaptation des Micro-organismes, UMR 7245 CNRS, Muséum National d'Histoire Naturelle, 57 Rue Cuvier (C.P. 54), 75005 Paris, France
| | - Jean Michel Brunel
- UMR MD1 "Membranes et Cibles Thérapeutiques", U1261 INSERM, Faculté de Pharmacie, Aix-Marseille Université, 27 bd Jean Moulin, 13385 Marseille, France
| | - Brent R Copp
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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Chen D, Cadelis MM, Rouvier F, Troia T, Edmeades LR, Fraser K, Gill ES, Bourguet-Kondracki ML, Brunel JM, Copp BR. α,ω-Diacyl-Substituted Analogues of Natural and Unnatural Polyamines: Identification of Potent Bactericides That Selectively Target Bacterial Membranes. Int J Mol Sci 2023; 24:5882. [PMID: 36982955 PMCID: PMC10052977 DOI: 10.3390/ijms24065882] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/14/2023] [Accepted: 03/19/2023] [Indexed: 03/30/2023] Open
Abstract
In this study, α-ω-disubstituted polyamines exhibit a range of potentially useful biological activities, including antimicrobial and antibiotic potentiation properties. We have prepared an expanded set of diarylbis(thioureido)polyamines that vary in central polyamine core length, identifying analogues with potent methicillin-resistant Staphylococcus aureus (MRSA), Escherichia coli, Acinetobacter baumannii and Candida albicans growth inhibition properties, in addition to the ability to enhance action of doxycycline towards Gram-negative bacterium Pseudomonas aeruginosa. The observation of associated cytotoxicity/hemolytic properties prompted synthesis of an alternative series of diacylpolyamines that explored aromatic head groups of varying lipophilicity. Examples bearing terminal groups each containing two phenyl rings (15a-f, 16a-f) were found to have optimal intrinsic antimicrobial properties, with MRSA being the most susceptible organism. A lack of observed cytotoxicity or hemolytic properties for all but the longest polyamine chain variants identified these as non-toxic Gram-positive antimicrobials worthy of further study. Analogues bearing either one or three aromatic-ring-containing head groups were either generally devoid of antimicrobial properties (one ring) or cytotoxic/hemolytic (three rings), defining a rather narrow range of head group lipophilicity that affords selectivity for Gram-positive bacterial membranes versus mammalian. Analogue 15d is bactericidal and targets the Gram-positive bacterial membrane.
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Affiliation(s)
- Dan Chen
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Melissa M. Cadelis
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Florent Rouvier
- UMR MD1 “Membranes et Cibles Therapeutiques”, U1261 INSERM, Faculté de Pharmacie, Aix-Marseille Universite, 27 bd Jean Moulin, 13385 Marseille, France
| | - Thomas Troia
- UMR MD1 “Membranes et Cibles Therapeutiques”, U1261 INSERM, Faculté de Pharmacie, Aix-Marseille Universite, 27 bd Jean Moulin, 13385 Marseille, France
| | - Liam R. Edmeades
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Kyle Fraser
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Evangelene S. Gill
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Marie-Lise Bourguet-Kondracki
- Laboratoire Molécules de Communication et Adaptation des Micro-Organismes, UMR 7245 CNRS, Muséum National d’Histoire Naturelle, 57 Rue Cuvier (C.P. 54), 75005 Paris, France
| | - Jean Michel Brunel
- UMR MD1 “Membranes et Cibles Therapeutiques”, U1261 INSERM, Faculté de Pharmacie, Aix-Marseille Universite, 27 bd Jean Moulin, 13385 Marseille, France
| | - Brent R. Copp
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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Cadelis MM, Li SA, van de Pas SJ, Grey A, Mulholland D, Weir BS, Copp BR, Wiles S. Antimicrobial Natural Products from Plant Pathogenic Fungi. Molecules 2023; 28:1142. [PMID: 36770808 PMCID: PMC9920077 DOI: 10.3390/molecules28031142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 01/18/2023] [Accepted: 01/19/2023] [Indexed: 01/26/2023] Open
Abstract
Isolates of a variety of fungal plant pathogens (Alternaria radicina ICMP 5619, Cercospora beticola ICMP 15907, Dactylonectria macrodidyma ICMP 16789, D. torresensis ICMP 20542, Ilyonectria europaea ICMP 16794, and I. liriodendra ICMP 16795) were screened for antimicrobial activity against the human pathogenic bacteria Acinetobacter baumannii, Pseudomonas aeruginosa, Escherichia coli, Mycobacterium abscessus, and M. marinum and were found to have some activity. Investigation of the secondary metabolites of these fungal isolates led to the isolation of ten natural products (1-10) of which one was novel, (E)-4,7-dihydroxyoct-2-enoic acid (1). Structure elucidation of all natural products was achieved by a combination of NMR spectroscopy and mass spectrometry. We also investigated the antimicrobial activity of a number of the isolated natural products. While we did not find (E)-4,7-dihydroxyoct-2-enoic acid (1) to have any activity against the bacteria and fungi in our assays, we did find that cercosporin (7) exhibited potent activity against Methicillin resistant Staphylococcus aureus (MRSA), dehydro-curvularin (6) and radicicol (10) exhibited antimycobacterial activity against M. marinum, and brefeldin A (8) and radicicol (10) exhibited antifungal activity against Candida albicans. Investigation of the cytotoxicity and haemolytic activities of these natural products (6-8 and 10) found that only one of the four active compounds, radicicol (10), was non-cytotoxic and non-haemolytic.
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Affiliation(s)
- Melissa M. Cadelis
- School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Steven A. Li
- School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Shara J. van de Pas
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Alex Grey
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Daniel Mulholland
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Bevan S. Weir
- Manaaki Whenua—Landcare Research, Private Bag 92170, Auckland 1142, New Zealand
| | - Brent R. Copp
- School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Siouxsie Wiles
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
- Te Pūnaha Matatini Centre of Research Excellence in Complex Systems, Auckland 1142, New Zealand
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Li SA, Zheng RJ, Sue K, Bourguet-Kondracki ML, Troudi A, Brunel JM, Copp BR, Cadelis MM. Discovery and Preliminary Structure-Activity Investigation of 3-Substituted-1H-imidazol-5-yl-1H-indoles with In Vitro Activity towards Methicillin-Resistant Staphylococcus aureus. Antibiotics (Basel) 2022; 11:antibiotics11101450. [PMID: 36290109 PMCID: PMC9598367 DOI: 10.3390/antibiotics11101450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 10/20/2022] [Accepted: 10/20/2022] [Indexed: 11/28/2022] Open
Abstract
Antibiotics have been the cornerstone of modern medicine saving lives by virtue of being able to cure infectious diseases and to prevent infections in those who are immune compromised. Their intense use has led to a surging increase in the incidence of antibiotic-resistant bacteria resulting in a desperate need for antibiotics with new mechanisms of action. As part of our search for new antimicrobials we have screened an in-house library of compounds and identified two 3-substituted-1H-imidazol-5-yl-1H-indoles as weak growth inhibitors (MIC 16 µg/mL) against methicillin-resistant Staphylococcus aureus (MRSA). An extensive library of analogues was prepared using the Van Leusen three-component reaction, biological evaluation of which led to the identification of two analogues (26 and 32) with favorable anti-MRSA activity (MIC ≤ 0.25 µg/mL) which also lacked cytotoxic or hemolytic properties. The screening campaign also identified two derivatives, a phenethyl-indole-imidazole 57 and a 5-phenyl-1H-imidazole 111 that were non-toxic selective antifungals towards Cryptococcus neoformans. These results have identified 3-substituted-1H-imidazol-5-yl-1H-indoles and 5-phenyl-1H-imidazoles as new structural scaffolds for further investigation as anti-MRSA and anti-C. neoformans agents, respectively.
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Affiliation(s)
- Steven A. Li
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Rebecca J. Zheng
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Kenneth Sue
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Marie-Lise Bourguet-Kondracki
- Laboratoire Molécules de Communication et Adaptation des Micro-Organismes, UMR 7245 CNRS, Muséum National d’Histoire Naturelle, 57 rue Cuvier (C.P. 54), 75005 Paris, France
| | - Azza Troudi
- UMR MD1 “Membranes et Cibles Thérapeutiques”, U1261 INSERM, Faculté de Pharmacie, Aix-Marseille Universite, 27 bd Jean Moulin, 13385 Marseille, France
| | - Jean Michel Brunel
- UMR MD1 “Membranes et Cibles Thérapeutiques”, U1261 INSERM, Faculté de Pharmacie, Aix-Marseille Universite, 27 bd Jean Moulin, 13385 Marseille, France
| | - Brent R. Copp
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Melissa M. Cadelis
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
- School of Medical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
- Correspondence:
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Li SA, Cadelis MM, Deed RC, Douafer H, Bourguet-Kondracki ML, Michel Brunel J, Copp BR. Valorisation of the diterpene podocarpic acid - Antibiotic and antibiotic enhancing activities of polyamine conjugates. Bioorg Med Chem 2022; 64:116762. [PMID: 35477062 DOI: 10.1016/j.bmc.2022.116762] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 04/05/2022] [Accepted: 04/18/2022] [Indexed: 11/02/2022]
Abstract
As part of our search for new antimicrobials and antibiotic adjuvants, a series of podocarpic acid-polyamine conjugates have been synthesized. The library of compounds made use of the phenolic and carboxylic acid moieties of the diterpene allowing attachment of polyamines (PA) of different lengths to afford a structurally-diverse set of analogues. Evaluation of the conjugates for intrinsic antimicrobial properties identified two derivatives of interest: a PA3-4-3 (spermine) amide-bonded variant 7a that was a non-cytotoxic, non-hemolytic potent growth inhibitor of Gram-positive Staphylococcus aureus (MRSA) and 9d, a PA3-8-3 carbamate derivative that was a non-toxic selective antifungal towards Cryptococcus neoformans. Of the compound set, only one example exhibited activity towards Gram-negative bacteria. However, in the presence of sub-therapeutic amounts of either doxycycline (4.5 µM) or erythromycin (2.7 μM) several analogues were observed to exhibit weak to modest antibiotic adjuvant properties against Pseudomonas aeruginosa and/or Escherichia coli. The observation of strong cytotoxicity and/or hemolytic properties for subsets of the library, in particular those analogues bearing methyl ester or n-pentylamide functionality, highlighted the fine balance of structural requirements and lipophilicity for antimicrobial activity as opposed to mammalian cell toxicity.
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Affiliation(s)
- Steven A Li
- School of Chemical Sciences, The University of Auckland, Waipapa Taumata Rau, Private Bag 92019, Auckland 1142, New Zealand
| | - Melissa M Cadelis
- School of Chemical Sciences, The University of Auckland, Waipapa Taumata Rau, Private Bag 92019, Auckland 1142, New Zealand
| | - Rebecca C Deed
- School of Chemical Sciences, The University of Auckland, Waipapa Taumata Rau, Private Bag 92019, Auckland 1142, New Zealand; School of Biological Sciences, The University of Auckland, Waipapa Taumata Rau, Private Bag 92019, Auckland 1142, New Zealand
| | - Hana Douafer
- Aix-Marseille Universite, INSERM, SSA, MCT, Faculté de Pharmacie, 27 bd Jean Moulin, 13385 Marseille, France
| | - Marie-Lise Bourguet-Kondracki
- Laboratoire Molécules de Communication et Adaptation des Micro-organismes, UMR 7245 CNRS, Muséum National d'Histoire Naturelle, 57 rue Cuvier (C.P. 54), 75005 Paris, France
| | - Jean Michel Brunel
- Aix-Marseille Universite, INSERM, SSA, MCT, Faculté de Pharmacie, 27 bd Jean Moulin, 13385 Marseille, France
| | - Brent R Copp
- School of Chemical Sciences, The University of Auckland, Waipapa Taumata Rau, Private Bag 92019, Auckland 1142, New Zealand.
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11
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Cadelis MM, Nipper NSL, Grey A, Geese S, van de Pas SJ, Weir BS, Copp BR, Wiles S. Antimicrobial Polyketide Metabolites from Penicillium bissettii and P. glabrum. Molecules 2021; 27:240. [PMID: 35011473 PMCID: PMC8746583 DOI: 10.3390/molecules27010240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 12/23/2021] [Accepted: 12/27/2021] [Indexed: 11/16/2022] Open
Abstract
Screening of several fungi from the New Zealand International Collection of Microorganisms from Plants identified two strains of Penicillium, P. bissettii and P. glabrum, which exhibited antimicrobial activity against Escherichia coli,Klebsiella pneumoniae, and Staphylococcus aureus. Further investigation into the natural products of the fungi, through extraction and fractionation, led to the isolation of five known polyketide metabolites, penicillic acid (1), citromycetin (2), penialdin A (3), penialdin F (4), and myxotrichin B (5). Semi-synthetic derivatization of 1 led to the discovery of a novel dihydro (1a) derivative that provided evidence for the existence of the much-speculated open-chained form of 1. Upon investigation of the antimicrobial activities of the natural products and derivatives, both penicillic acid (1) and penialdin F (4) were found to inhibit the growth of Methicillin-resistant S. aureus. Penialdin F (4) was also found to have some inhibitory activity against Mycobacterium abscessus and M. marinum along with citromycetin (2).
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Affiliation(s)
- Melissa M. Cadelis
- School of Chemical Sciences, University of Auckland, Waipapa Taumata Rau, Private Bag 92019, Auckland 1142, New Zealand; (N.S.L.N.); (B.R.C.)
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Waipapa Taumata Rau, Private Bag 92019, Auckland 1142, New Zealand; (A.G.); (S.G.); (S.J.v.d.P.)
| | - Natasha S. L. Nipper
- School of Chemical Sciences, University of Auckland, Waipapa Taumata Rau, Private Bag 92019, Auckland 1142, New Zealand; (N.S.L.N.); (B.R.C.)
| | - Alex Grey
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Waipapa Taumata Rau, Private Bag 92019, Auckland 1142, New Zealand; (A.G.); (S.G.); (S.J.v.d.P.)
| | - Soeren Geese
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Waipapa Taumata Rau, Private Bag 92019, Auckland 1142, New Zealand; (A.G.); (S.G.); (S.J.v.d.P.)
| | - Shara J. van de Pas
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Waipapa Taumata Rau, Private Bag 92019, Auckland 1142, New Zealand; (A.G.); (S.G.); (S.J.v.d.P.)
| | - Bevan S. Weir
- Manaaki Whenua, Landcare Research, Private Bag 92170, Auckland 1142, New Zealand;
| | - Brent R. Copp
- School of Chemical Sciences, University of Auckland, Waipapa Taumata Rau, Private Bag 92019, Auckland 1142, New Zealand; (N.S.L.N.); (B.R.C.)
| | - Siouxsie Wiles
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Waipapa Taumata Rau, Private Bag 92019, Auckland 1142, New Zealand; (A.G.); (S.G.); (S.J.v.d.P.)
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12
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Grey ABJ, Cadelis MM, Diao Y, Park D, Lumley T, Weir BS, Copp BR, Wiles S. Screening of Fungi for Antimycobacterial Activity Using a Medium-Throughput Bioluminescence-Based Assay. Front Microbiol 2021; 12:739995. [PMID: 34552577 PMCID: PMC8450596 DOI: 10.3389/fmicb.2021.739995] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 08/10/2021] [Indexed: 11/16/2022] Open
Abstract
There is a real and urgent need for new antibiotics able to kill Mycobacteria, acid-fast bacilli capable of causing multiple deadly diseases. These include members of the Mycobacterium tuberculosis complex, which causes the lung disease tuberculosis (TB) as well as non-tuberculous Mycobacteria (NTM) a growing cause of lung, skin, soft tissue, and other infections. Here we describe a medium-throughput bioluminescence-based pipeline to screen fungi for activity against Mycobacteria using the NTM species Mycobacterium abscessus and Mycobacterium marinum. We used this pipeline to screen 36 diverse fungal isolates from the International Collection of Microorganisms from Plants (ICMP) grown on a wide variety of nutrient-rich and nutrient-poor media and discovered that almost all the tested isolates produced considerable anti-mycobacterial activity. Our data also provides strong statistical evidence for the impact of growth media on antibacterial activity. Chemical extraction and fractionation of a subset of the ICMP isolates revealed that much of the activity we observed may be due to the production of the known anti-mycobacterial compound linoleic acid. However, we have identified several ICMP isolates that retained their anti-mycobacterial activity in non-linoleic acid containing fractions. These include isolates of Lophodermium culmigenum, Pseudaegerita viridis, and Trametes coccinea, as well as an unknown species of Boeremia and an isolate of an unknown genus and species in the family Phanerochaetaceae. Investigations are ongoing to identify the sources of their anti-mycobacterial activity and to determine whether any may be due to the production of novel bioactive compounds.
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Affiliation(s)
- Alexander B J Grey
- Bioluminescent Superbugs Lab, Department of Molecular Medicine and Pathology, School of Medical Sciences, The University of Auckland - Waipapa Taumata Rau, Auckland, New Zealand
| | - Melissa M Cadelis
- Bioluminescent Superbugs Lab, Department of Molecular Medicine and Pathology, School of Medical Sciences, The University of Auckland - Waipapa Taumata Rau, Auckland, New Zealand.,School of Chemical Sciences, The University of Auckland - Waipapa Taumata Rau, Auckland, New Zealand
| | - Yiwei Diao
- Bioluminescent Superbugs Lab, Department of Molecular Medicine and Pathology, School of Medical Sciences, The University of Auckland - Waipapa Taumata Rau, Auckland, New Zealand
| | - Duckchul Park
- Manaaki Whenua - Landcare Research, Auckland, New Zealand
| | - Thomas Lumley
- Department of Statistics, The University of Auckland - Waipapa Taumata Rau, Auckland, New Zealand
| | - Bevan S Weir
- Manaaki Whenua - Landcare Research, Auckland, New Zealand
| | - Brent R Copp
- School of Chemical Sciences, The University of Auckland - Waipapa Taumata Rau, Auckland, New Zealand
| | - Siouxsie Wiles
- Bioluminescent Superbugs Lab, Department of Molecular Medicine and Pathology, School of Medical Sciences, The University of Auckland - Waipapa Taumata Rau, Auckland, New Zealand
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13
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Cadelis MM, Gordon H, Grey A, Geese S, Mulholland DR, Weir BS, Copp BR, Wiles S. Isolation of a Novel Polyketide from Neodidymelliopsis sp. Molecules 2021; 26:molecules26113235. [PMID: 34072211 PMCID: PMC8199022 DOI: 10.3390/molecules26113235] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 05/21/2021] [Accepted: 05/24/2021] [Indexed: 02/02/2023] Open
Abstract
Fungi have become an invaluable source of bioactive natural products, with more than 5 million species of fungi spanning the globe. Fractionation of crude extract of Neodidymelliopsis sp., led to the isolation of a novel polyketide, (2Z)-cillifuranone (1) and five previously reported natural products, (2E)-cillifuranone (2), taiwapyrone (3), xylariolide D (4), pachybasin (5), and N-(5-hydroxypentyl)acetamide (6). It was discovered that (2Z)-cillifuranone (1) was particularly sensitive to ambient temperature and light resulting in isomerisation to (2E)-cillifuranone (2). Structure elucidation of all the natural products were conducted by NMR spectroscopic techniques. The antimicrobial activity of 2, 3, and 5 were evaluated against a variety of bacterial and fungal pathogens. A sodium [1-13C] acetate labelling study was conducted on Neodidymelliopsis sp. and confirmed that pachybasin is biosynthesised through the acetate polyketide pathway.
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Affiliation(s)
- Melissa M. Cadelis
- School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; (H.G.); (B.R.C.)
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; (A.G.); (S.G.); (D.R.M.)
- Correspondence: (M.M.C.); (S.W.)
| | - Hugo Gordon
- School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; (H.G.); (B.R.C.)
| | - Alex Grey
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; (A.G.); (S.G.); (D.R.M.)
| | - Soeren Geese
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; (A.G.); (S.G.); (D.R.M.)
| | - Daniel R. Mulholland
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; (A.G.); (S.G.); (D.R.M.)
| | - Bevan S. Weir
- Manaaki Whenua – Landcare Research, Private Bag 92170, Auckland 1142, New Zealand;
| | - Brent R. Copp
- School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; (H.G.); (B.R.C.)
| | - Siouxsie Wiles
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; (A.G.); (S.G.); (D.R.M.)
- Correspondence: (M.M.C.); (S.W.)
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14
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Pearce AN, Chen D, Edmeades LR, Cadelis MM, Troudi A, Brunel JM, Bourguet-Kondracki ML, Copp BR. Repurposing primaquine as a polyamine conjugate to become an antibiotic adjuvant. Bioorg Med Chem 2021; 38:116110. [PMID: 33831695 DOI: 10.1016/j.bmc.2021.116110] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 03/04/2021] [Accepted: 03/06/2021] [Indexed: 11/17/2022]
Abstract
In our search for new antibiotic adjuvants as a novel strategy to deal with the emergence of multi-drug resistant (MDR) bacteria, a series of succinylprimaquine-polyamine (SPQ-PA) conjugates and derivatives of a cationic amphiphilic nature have been prepared. Evaluation of these primaquine conjugates for intrinsic antimicrobial properties and the ability to restore the antibiotic activity of doxycycline identified two derivatives, SPQ-PA3-8-3 and SPQ-PA3-10-3 that exhibited intrinsic activity against the Gram-positive bacteria Staphylococcus aureus and the yeast Cryptococcus neoformans. None of the analogues were active against the Gram-negative bacterium Pseudomonas aeruginosa. However, in the presence of a sub-therapeutic amount of doxycycline (4.5 µM), both SPQ-PA3-4-3 and SPQ-PA3-10-3 compounds displayed potent antibiotic adjuvant properties against P. aeruginosa, with MIC's of 6.25 µM. A series of derivatives were prepared to investigate the structure-activity relationship that explored the influence of both a simplified aryl lipophilic substituent and variation of the length of the polyamine scaffold on observed intrinsic antimicrobial properties and the ability to potentiate the action of doxycycline against P. aeruginosa.
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Affiliation(s)
- A Norrie Pearce
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Dan Chen
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Liam R Edmeades
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Melissa M Cadelis
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Azza Troudi
- UMR_MD1, U-1261, Aix Marseille Universite, INSERM, SSA, MCT, 13385 Marseille, France
| | - Jean Michel Brunel
- UMR_MD1, U-1261, Aix Marseille Universite, INSERM, SSA, MCT, 13385 Marseille, France
| | - Marie-Lise Bourguet-Kondracki
- Laboratoire Molécules de Communication et Adaptation des Micro-organismes, UMR 7245 CNRS, Muséum National d'Histoire Naturelle, 57 rue Cuvier (C.P. 54), 75005 Paris, France
| | - Brent R Copp
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
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15
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Cadelis MM, Geese S, Uy BB, Mulholland DR, van de Pas SJ, Grey A, Weir BS, Copp BR, Wiles S. Antimicrobial Metabolites against Methicillin-Resistant Staphylococcus aureus from the Endophytic Fungus Neofusicoccum australe. Molecules 2021; 26:molecules26041094. [PMID: 33669637 PMCID: PMC7922810 DOI: 10.3390/molecules26041094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Revised: 02/10/2021] [Accepted: 02/17/2021] [Indexed: 11/16/2022] Open
Abstract
Antimicrobial bioassay-guided fractionation of the endophytic fungi Neofusicoccum australe led to the isolation of a new unsymmetrical naphthoquinone dimer, neofusnaphthoquinone B (1), along with four known natural products (2–5). Structure elucidation was conducted by nuclear magnetic resonance (NMR) spectroscopic methods, and the antimicrobial activity of all the natural products was investigated, revealing 1 to be moderately active towards methicillin-resistant Staphylococcus aureus (MRSA) with a minimum inhibitory concentration (MIC) of 16 µg/mL.
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Affiliation(s)
- Melissa M. Cadelis
- School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand;
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; (S.G.); (B.B.U.); (D.R.M.); (S.J.v.d.P.); (A.G.)
- Correspondence: (M.M.C.); (S.W.)
| | - Soeren Geese
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; (S.G.); (B.B.U.); (D.R.M.); (S.J.v.d.P.); (A.G.)
| | - Benedict B. Uy
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; (S.G.); (B.B.U.); (D.R.M.); (S.J.v.d.P.); (A.G.)
| | - Daniel R. Mulholland
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; (S.G.); (B.B.U.); (D.R.M.); (S.J.v.d.P.); (A.G.)
| | - Shara J. van de Pas
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; (S.G.); (B.B.U.); (D.R.M.); (S.J.v.d.P.); (A.G.)
| | - Alex Grey
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; (S.G.); (B.B.U.); (D.R.M.); (S.J.v.d.P.); (A.G.)
| | - Bevan S. Weir
- Manaaki Whenua-Landcare Research, Private Bag 92170, Auckland 1142, New Zealand;
| | - Brent R. Copp
- School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand;
| | - Siouxsie Wiles
- Bioluminescent Superbugs Lab, School of Medical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; (S.G.); (B.B.U.); (D.R.M.); (S.J.v.d.P.); (A.G.)
- Correspondence: (M.M.C.); (S.W.)
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16
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Lee AJ, Cadelis MM, Kim SH, Swift S, Copp BR, Villas-Boas SG. Epipyrone A, a Broad-Spectrum Antifungal Compound Produced by Epicoccum nigrum ICMP 19927. Molecules 2020; 25:E5997. [PMID: 33352899 PMCID: PMC7766273 DOI: 10.3390/molecules25245997] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Revised: 12/10/2020] [Accepted: 12/16/2020] [Indexed: 02/02/2023] Open
Abstract
We have isolated a filamentous fungus that actively secretes a pigmented exudate when growing on agar plates. The fungus was identified as being a strain of Epicoccum nigrum. The fungal exudate presented strong antifungal activity against both yeasts and filamentous fungi, and inhibited the germination of fungal spores. The chemical characterization of the exudate showed that the pigmented molecule presenting antifungal activity is the disalt of epipyrone A-a water-soluble polyene metabolite with a molecular mass of 612.29 and maximal UV-Vis absorbance at 428 nm. This antifungal compound showed excellent stability to different temperatures and neutral to alkaline pH.
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Affiliation(s)
- Alex J. Lee
- School of Biological Sciences, University of Auckland, 3A Symonds Street, 1010 Auckland, New Zealand; (A.J.L.); (S.H.K.)
| | - Melissa M. Cadelis
- School of Chemical Sciences, University of Auckland, 23 Symonds Street, 1010 Auckland, New Zealand; (M.M.C.); (B.R.C.)
- School of Medical Sciences, University of Auckland, 85 Park Road, Grafton, 1023 Auckland, New Zealand;
| | - Sang H. Kim
- School of Biological Sciences, University of Auckland, 3A Symonds Street, 1010 Auckland, New Zealand; (A.J.L.); (S.H.K.)
| | - Simon Swift
- School of Medical Sciences, University of Auckland, 85 Park Road, Grafton, 1023 Auckland, New Zealand;
| | - Brent R. Copp
- School of Chemical Sciences, University of Auckland, 23 Symonds Street, 1010 Auckland, New Zealand; (M.M.C.); (B.R.C.)
| | - Silas G. Villas-Boas
- School of Biological Sciences, University of Auckland, 3A Symonds Street, 1010 Auckland, New Zealand; (A.J.L.); (S.H.K.)
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17
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Cadelis MM, Li SA, Bourguet-Kondracki ML, Blanchet M, Douafer H, Brunel JM, Copp BR. Spermine Derivatives of Indole-3-carboxylic Acid, Indole-3-acetic Acid and Indole-3-acrylic Acid as Gram-Negative Antibiotic Adjuvants. ChemMedChem 2020; 16:513-523. [PMID: 33090655 DOI: 10.1002/cmdc.202000359] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 09/28/2020] [Indexed: 01/08/2023]
Abstract
The discovery of new antibiotic adjuvants is an attractive option for overcoming antimicrobial resistance. We have previously reported the discovery of a bis-6-bromoindolglyoxylamide derivative of spermine as being able to enhance the action of antibiotics against Gram-negative bacteria but suffers from being cytotoxic and red-blood cell haemolytic. A series of analogues was prepared exploring variation of the indolglyoxylamide unit, to include indole-3-acrylic, indole-3-acetic and indole-3-carboxylate units, and evaluated for antibiotic enhancing properties against a range of Gram-negative bacteria, and for intrinsic antimicrobial, cytotoxic and haemolytic properties. Two spermine derivatives, bearing 5-bromo-indole-3-acetic acid (17) and 5-methoxy-indole-3-acrylic acid (14) end groups were found to exhibit good to moderate antibiotic adjuvant activities for doxycycline towards the Gram-negative bacteria Pseudomonas aeruginosa, Escherichia coli and Klebsiella pneumoniae, but with more modest intrinsic antimicrobial activity and greatly reduced cytotoxic and haemolytic properties. The mechanism of action of the latter derivative identified its ability to disrupt the outer membranes of bacteria and to inhibit the AcrAB-TolC efflux pump directly or by inhibiting the proton gradient.
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Affiliation(s)
- Melissa M Cadelis
- School of Chemical Sciences, The University of Auckland, Private Bag, 92019, Auckland 1142, New Zealand
| | - Steven A Li
- School of Chemical Sciences, The University of Auckland, Private Bag, 92019, Auckland 1142, New Zealand
| | - Marie-Lise Bourguet-Kondracki
- Laboratoire Molécules de Communication et Adaptation des Micro-organismes UMR 7245 CNRS Muséum National d'Histoire Naturelle, 57 rue Cuvier (C.P. 54), 75005, Paris, France
| | - Marine Blanchet
- Aix-Marseille Université, INSERM, SSA, MCT, 13385, Marseille, France
| | - Hana Douafer
- Aix-Marseille Université, INSERM, SSA, MCT, 13385, Marseille, France
| | | | - Brent R Copp
- School of Chemical Sciences, The University of Auckland, Private Bag, 92019, Auckland 1142, New Zealand
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18
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Barker D, Lee S, Varnava KG, Sparrow K, van Rensburg M, Deed RC, Cadelis MM, Li SA, Copp BR, Sarojini V, Pilkington LI. Synthesis and Antibacterial Analysis of Analogues of the Marine Alkaloid Pseudoceratidine. Molecules 2020; 25:E2713. [PMID: 32545320 PMCID: PMC7321382 DOI: 10.3390/molecules25112713] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 06/05/2020] [Accepted: 06/10/2020] [Indexed: 11/17/2022] Open
Abstract
In an effort to gain more understanding on the structure activity relationship of pseudoceratidine 1, a di-bromo pyrrole spermidine alkaloid derived from the marine sponge Pseudoceratina purpurea that has been shown to exhibit potent biofouling, anti-fungal, antibacterial, and anti-malarial activities, a large series of 65 compounds that incorporated several aspects of structural variation has been synthesised through an efficient, divergent method that allowed for a number of analogues to be generated from common precursors. Subsequently, all analogues were assessed for their antibacterial activity against both Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria. Overall, several compounds exhibited comparable or better activity than that of pseudoceratidine 1, and it was found that this class of compounds is generally more effective against Gram-positive than Gram-negative bacteria. Furthermore, altering several structural features allowed for the establishment of a comprehensive structure activity relationship (SAR), where it was concluded that several structural features are critical for potent anti-bacterial activity, including di-halogenation (preferable bromine, but chlorine is also effective) on the pyrrole ring, two pyrrolic units in the structure and with one or more secondary amines in the chain adjoining these units, with longer chains giving rise to better activities.
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Affiliation(s)
- David Barker
- School of Chemical Sciences, University of Auckland, Auckland 1010, New Zealand; (S.L.); (K.G.V.); (K.S.); (M.v.R.); (R.C.D.); (M.M.C.); (S.A.L.); (B.R.C.); (V.S.); (L.I.P.)
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington 6140, New Zealand
| | - Stephanie Lee
- School of Chemical Sciences, University of Auckland, Auckland 1010, New Zealand; (S.L.); (K.G.V.); (K.S.); (M.v.R.); (R.C.D.); (M.M.C.); (S.A.L.); (B.R.C.); (V.S.); (L.I.P.)
| | - Kyriakos G. Varnava
- School of Chemical Sciences, University of Auckland, Auckland 1010, New Zealand; (S.L.); (K.G.V.); (K.S.); (M.v.R.); (R.C.D.); (M.M.C.); (S.A.L.); (B.R.C.); (V.S.); (L.I.P.)
| | - Kevin Sparrow
- School of Chemical Sciences, University of Auckland, Auckland 1010, New Zealand; (S.L.); (K.G.V.); (K.S.); (M.v.R.); (R.C.D.); (M.M.C.); (S.A.L.); (B.R.C.); (V.S.); (L.I.P.)
| | - Michelle van Rensburg
- School of Chemical Sciences, University of Auckland, Auckland 1010, New Zealand; (S.L.); (K.G.V.); (K.S.); (M.v.R.); (R.C.D.); (M.M.C.); (S.A.L.); (B.R.C.); (V.S.); (L.I.P.)
| | - Rebecca C. Deed
- School of Chemical Sciences, University of Auckland, Auckland 1010, New Zealand; (S.L.); (K.G.V.); (K.S.); (M.v.R.); (R.C.D.); (M.M.C.); (S.A.L.); (B.R.C.); (V.S.); (L.I.P.)
- School of Biological Sciences, University of Auckland, Auckland 1010, New Zealand
| | - Melissa M. Cadelis
- School of Chemical Sciences, University of Auckland, Auckland 1010, New Zealand; (S.L.); (K.G.V.); (K.S.); (M.v.R.); (R.C.D.); (M.M.C.); (S.A.L.); (B.R.C.); (V.S.); (L.I.P.)
| | - Steven A. Li
- School of Chemical Sciences, University of Auckland, Auckland 1010, New Zealand; (S.L.); (K.G.V.); (K.S.); (M.v.R.); (R.C.D.); (M.M.C.); (S.A.L.); (B.R.C.); (V.S.); (L.I.P.)
| | - Brent R. Copp
- School of Chemical Sciences, University of Auckland, Auckland 1010, New Zealand; (S.L.); (K.G.V.); (K.S.); (M.v.R.); (R.C.D.); (M.M.C.); (S.A.L.); (B.R.C.); (V.S.); (L.I.P.)
| | - Vijayalekshmi Sarojini
- School of Chemical Sciences, University of Auckland, Auckland 1010, New Zealand; (S.L.); (K.G.V.); (K.S.); (M.v.R.); (R.C.D.); (M.M.C.); (S.A.L.); (B.R.C.); (V.S.); (L.I.P.)
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington 6140, New Zealand
| | - Lisa I. Pilkington
- School of Chemical Sciences, University of Auckland, Auckland 1010, New Zealand; (S.L.); (K.G.V.); (K.S.); (M.v.R.); (R.C.D.); (M.M.C.); (S.A.L.); (B.R.C.); (V.S.); (L.I.P.)
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19
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Cadelis MM, Pike EIW, Kang W, Wu Z, Bourguet-Kondracki ML, Blanchet M, Vidal N, Brunel JM, Copp BR. Exploration of the antibiotic potentiating activity of indolglyoxylpolyamines. Eur J Med Chem 2019; 183:111708. [PMID: 31550659 DOI: 10.1016/j.ejmech.2019.111708] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 08/29/2019] [Accepted: 09/15/2019] [Indexed: 11/29/2022]
Abstract
A series of substituted di-indolglyoxylamido-spermine analogues were prepared and evaluated for intrinsic antimicrobial properties and the ability to enhance antibiotic action. As a compound class, intrinsic activity was typically observed towards Gram-positive bacteria and the fungus Cryptococcus neoformans, with notable exceptions being the 5-bromo- and 6-chloro-indole analogues which also exhibited modest activity (MIC 34-50 μM) towards the Gram-negative bacteria Escherichia coli and Klebsiella pneumoniae. Several analogues enhanced the activity of doxycycline towards the Gram-negative bacteria Pseudomonas aeruginosa, E. coli, K. pneumoniae and Acinetobacter baumannii. Of particular note was the identification of five antibiotic enhancing analogues (5-Br, 7-F, 5-Me, 7-Me, 7-OMe) which also exhibited low to no cytotoxicity and red blood cell haemolytic properties. The mechanisms of action of the 5-Br and 7-F analogues were attributed to the ability to disrupt the integrity of, and depolarize, bacterial membranes.
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Affiliation(s)
- Melissa M Cadelis
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand
| | - Elliot I W Pike
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand
| | - Weirong Kang
- School of Pharmacy, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand
| | - Zimei Wu
- School of Pharmacy, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand
| | - Marie-Lise Bourguet-Kondracki
- Laboratoire Molécules de Communication et Adaptation des Micro-organismes, UMR 7245 CNRS, Muséum National d'Histoire Naturelle, 57 Rue Cuvier (C.P. 54), 75005, Paris, France
| | - Marine Blanchet
- Aix Marseille Univ, INSERM, SSA, MCT, Faculté de Pharmacie, 27 bd Jean Moulin, 13385, Marseille, France
| | - Nicolas Vidal
- YELEN, 10 bd Tempête, 13820, Ensues la Redonne, France
| | - Jean Michel Brunel
- Aix Marseille Univ, INSERM, SSA, MCT, Faculté de Pharmacie, 27 bd Jean Moulin, 13385, Marseille, France
| | - Brent R Copp
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand.
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Li SA, Cadelis MM, Sue K, Blanchet M, Vidal N, Brunel JM, Bourguet-Kondracki ML, Copp BR. 6-Bromoindolglyoxylamido derivatives as antimicrobial agents and antibiotic enhancers. Bioorg Med Chem 2019; 27:2090-2099. [DOI: 10.1016/j.bmc.2019.04.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 04/03/2019] [Indexed: 01/28/2023]
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21
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Fong HK, Cadelis MM, Brunel JM, Bourguet-Kondracki ML, Barker D, Copp BR. Alaninyl variants of the marine natural product halocyamine A and their antibacterial properties. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.10.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Cadelis MM, Copp BR. Investigation of the electrophilic reactivity of the biologically active marine sesquiterpenoid onchidal and model compounds. Beilstein J Org Chem 2018; 14:2229-2235. [PMID: 30202476 PMCID: PMC6122400 DOI: 10.3762/bjoc.14.197] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Accepted: 08/02/2018] [Indexed: 01/15/2023] Open
Abstract
The structure of the sesquiterpene onchidal (6), a component of the defensive secretion of the shell-less mollusc Onchidella binneyi, contains a masked α,β-unsaturated 1,4-dialdehyde moiety, the presence of which has been proposed to be the cause of the feeding deterrent activity exhibited by the mollusc. We have found onchidal acts as an electrophile, reacting rapidly with the model nucleophile n-pentylamine forming diastereomeric aminated pyrrole adducts. Somewhat surprisingly, no reaction was observed between onchidal and n-pentanethiol. Structurally simplified n-pentyl 11–13 and cyclohexylmethyl 15–17 analogues of onchidal were prepared and demonstrated similar amine-selective reactivity. Onchidal and analogues reacted with the model protein lysozyme, forming covalent adducts and leading to protein cross-linking. These results provide preliminary evidence supporting the molecular mechanism of biological activity exhibited by onchidal.
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Affiliation(s)
- Melissa M Cadelis
- School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Brent R Copp
- School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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Lam CF, Cadelis MM, Copp BR. Exploration of the influence of spiro-dienone moiety on biological activity of the cytotoxic marine alkaloid discorhabdin P. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.06.057] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Cadelis MM, Bourguet-Kondracki ML, Dubois J, Kaiser M, Brunel JM, Barker D, Copp BR. Structure-activity relationship studies on thiaplidiaquinones A and B as novel inhibitors of Plasmodium falciparum and farnesyltransferase. Bioorg Med Chem 2017; 25:4433-4443. [DOI: 10.1016/j.bmc.2017.06.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 06/15/2017] [Accepted: 06/16/2017] [Indexed: 10/19/2022]
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Goey AKL, Chau CH, Sissung TM, Cook KM, Venzon DJ, Castro A, Ransom TR, Henrich CJ, McKee TC, McMahon JB, Grkovic T, Cadelis MM, Copp BR, Gustafson KR, Figg WD. Screening and Biological Effects of Marine Pyrroloiminoquinone Alkaloids: Potential Inhibitors of the HIF-1α/p300 Interaction. J Nat Prod 2016; 79:1267-75. [PMID: 27140429 PMCID: PMC6323635 DOI: 10.1021/acs.jnatprod.5b00846] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Inhibition of the hypoxia-inducible factor 1α (HIF-1α) pathway by disrupting its association with the transcriptional coactivator p300 inhibits angiogenesis and tumor development. Development of HIF-1α/p300 inhibitors has been hampered by preclinical toxicity; therefore, we aimed to identify novel HIF-1α/p300 inhibitors. Using a cell-free assay designed to test compounds that block HIF-1α/p300 binding, 170 298 crude natural product extracts and prefractionated samples were screened, identifying 25 active extracts. One of these extracts, originating from the marine sponge Latrunculia sp., afforded six pyrroloiminoquinone alkaloids that were identified as positive hits (IC50 values: 1-35 μM). Luciferase assays confirmed inhibition of HIF-1α transcriptional activity by discorhabdin B (1) and its dimer (2), 3-dihydrodiscorhabdin C (3), makaluvamine F (5), discorhabdin H (8), discorhabdin L (9), and discorhabdin W (11) in HCT 116 colon cancer cells (0.1-10 μM, p < 0.05). Except for 11, all of these compounds also reduced HIF-1α transcriptional activity in LNCaP prostate cancer cells (0.1-10 μM, p < 0.05). These effects occurred at noncytotoxic concentrations (<50% cell death) under hypoxic conditions. At the downstream HIF-1α target level, compound 8 (0.5 μM) significantly decreased VEGF secretion in LNCaP cells (p < 0.05). In COLO 205 colon cancer cells no activity was shown in the luciferase or cytotoxicity assays. Pyrroloiminoquinone alkaloids are a novel class of HIF-1α inhibitors, which interrupt the protein-protein interaction between HIF-1α and p300 and consequently reduce HIF-related transcription.
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Affiliation(s)
- Andrew K. L. Goey
- Clinical Pharmacology Program, National Cancer Institute, Bethesda, Maryland 20892, United States
| | - Cindy H. Chau
- Clinical Pharmacology Program, National Cancer Institute, Bethesda, Maryland 20892, United States
| | - Tristan M. Sissung
- Clinical Pharmacology Program, National Cancer Institute, Bethesda, Maryland 20892, United States
| | - Kristina M. Cook
- Clinical Pharmacology Program, National Cancer Institute, Bethesda, Maryland 20892, United States
| | - David J. Venzon
- Biostatistics & Data Management Section, National Cancer Institute, Bethesda, Maryland 20892, United States
| | - Amaya Castro
- Molecular Targets Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702-1201, United States
| | - Tanya R. Ransom
- Molecular Targets Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702-1201, United States
| | - Curtis J. Henrich
- Molecular Targets Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702-1201, United States
- Basic Science Program, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland 21702-1201, United States
| | - Tawnya C. McKee
- Molecular Targets Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702-1201, United States
| | - James B. McMahon
- Molecular Targets Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702-1201, United States
| | - Tanja Grkovic
- School of Chemical Sciences, University of Auckland, Auckland 1142, New Zealand
| | - Melissa M. Cadelis
- School of Chemical Sciences, University of Auckland, Auckland 1142, New Zealand
| | - Brent R. Copp
- School of Chemical Sciences, University of Auckland, Auckland 1142, New Zealand
| | - Kirk R. Gustafson
- Molecular Targets Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702-1201, United States
| | - William D. Figg
- Clinical Pharmacology Program, National Cancer Institute, Bethesda, Maryland 20892, United States
- Corresponding Author: Tel (W. D. Figg): +1-301-402-3623. Fax: +1-301-402-8606.
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Cadelis MM, Bourguet-Kondracki ML, Dubois J, Valentin A, Barker D, Copp BR. Discovery and preliminary structure-activity relationship studies on tecomaquinone I and tectol as novel farnesyltransferase and plasmodial inhibitors. Bioorg Med Chem 2016; 24:3102-7. [PMID: 27240468 DOI: 10.1016/j.bmc.2016.05.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 05/11/2016] [Accepted: 05/16/2016] [Indexed: 11/18/2022]
Abstract
Biological screening of a library of synthesized benzo[c]chromene-7,10-dione natural products against human farnesyltransferase (FTase) has identified tecomaquinone I (IC50 of 0.065±0.004μM) as being one of the more potent natural product inhibitors identified to date. Anti-plasmodial screening of the same library against a drug-resistant strain of Plasmodium falciparum identified the structurally-related dichromenol tectol as a moderately active growth inhibitor with an IC50 3.44±0.20μM. Two novel series of analogues, based on the benzo[c]chromene-7,10-dione scaffold, were subsequently synthesized, with one analogue exhibiting farnesyltransferase inhibitory activity in the low micromolar range. A preliminary structure-activity relationship (SAR) study has identified different structural requirements for anti-malarial activity in comparison to FTase activities for these classes of natural products. Our results identify tecomaquinone I as a novel scaffold from which more potent inhibitors of human and parasitic FTase could be developed.
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Affiliation(s)
- Melissa M Cadelis
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Marie-Lise Bourguet-Kondracki
- Laboratoire Molécules de Communication et Adaptation des Micro-organismes, UMR 7245 CNRS, Muséum National d'Histoire Naturelle, 57 rue Cuvier (C.P. 54), 75005 Paris, France
| | - Joëlle Dubois
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Centre de Recherche de Gif, Avenue de la Terrasse, 91198 Gif sur Yvette Cedex, France
| | - Alexis Valentin
- Université de Toulouse, PHARMA-DEV, UMR 152 IRD-UPS, UPS, 118 Route de Narbonne, F-31062 Toulouse Cedex 9, France
| | - David Barker
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Brent R Copp
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
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Abstract
The first total synthesis of the unusual aromatic sesquiterpene panicein A2 is reported and the structure of the natural product has been confirmed. When tested by the NCI against a range of human cancer cell lines, it was found that panicein A2 exhibits very little antiproliferative activity at 10 μM – an observation that is at odds with the earlier report that stated panicein A2 exhibits in vitro cytotoxicity against a number of tumour cell lines.
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Affiliation(s)
- Lili Yeung
- School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland, New Zealand
| | - Lisa I Pilkington
- School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland, New Zealand
| | - Melissa M Cadelis
- School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland, New Zealand
| | - Brent R Copp
- School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland, New Zealand
| | - David Barker
- School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland, New Zealand
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