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Zeng Y, Lu T, Ren S, Hu Z, Fang J, Guan Z, Li J, Liu L, Gao Z. Biosynthesis of Ester-Bond Containing Quinolone Alkaloids with (3 R,4 S) Stereoconfiguration. Org Lett 2024; 26:6692-6697. [PMID: 39058897 DOI: 10.1021/acs.orglett.4c02372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2024]
Abstract
Asperalins represent a novel class of viridicatin natural products with potent inhibitory activities against fish pathogens. In this study, we elucidated the biosynthesis of asperalins in the Aspergillus oryzae NSAR1 heterologous host and identified the FAD-dependent monooxygenase AplB stereoselectively hydroxylates viridicatin to yield a unique 3R,4S configuration. The monomodular NRPS AplJ catalyzes a rare intramolecular ester bond formation reaction using dihydroquinoline as a nucleophile. Subsequent modifications by cytochrome P450 AplF, chlorinase AplN, and prenyltransferase AplE tailor the anthranilic acid portion, leading to the formation of asperalins. Additionally, we explored the potential of AplB for the hydroxylation of viridicatin analogs, demonstrating its relaxed substrate specificity. This finding suggests that AplB could be developed as a biocatalyst for the synthesis of viridicatin derivatives.
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Affiliation(s)
- Yujing Zeng
- School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Tiantian Lu
- School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Shuya Ren
- School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Zhibo Hu
- School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Jing Fang
- School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Zhifeng Guan
- School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Jing Li
- School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Lan Liu
- School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Zhizeng Gao
- Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China
- Southern Laboratory of Ocean Science and Engineering (Guangdong, Zhuhai), Zhuhai 519000, China
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Bundela R, Cameron RC, Singh AJ, McLellan RM, Richardson AT, Berry D, Nicholson MJ, Parker EJ. Generation of Alternate Indole Diterpene Architectures in Two Species of Aspergilli. J Am Chem Soc 2023; 145:2754-2758. [PMID: 36710518 PMCID: PMC9913125 DOI: 10.1021/jacs.2c11170] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Indexed: 01/31/2023]
Abstract
The significant structural diversity and potent bioactivity of the fungal indole diterpenes (IDTs) has attracted considerable interest in their biosynthesis. Although substantial skeletal diversity is generated by the action of noncanonical terpene cyclases, comparatively little is known about these enzymes, particularly those involved in the generation of the subgroup containing emindole SA and DA, which show alternate terpenoid skeletons. Here, we describe the IDT biosynthetic machinery generating these unusual IDT architectures from Aspergillus striatus and Aspergillus desertorum. The function of four putative cyclases was interrogated via heterologous expression. Two specific cyclases were identified that catalyze the formation of epimers emindole SA and DA from A. striatus and A. desertorum, respectively. These cyclases are both clustered along with all the elements required for basic IDT biosynthesis yet catalyze an unusual Markovnikov-like cyclization cascade with alternate stereochemical control. Their identification reveals that these alternate architectures are not generated by mechanistically sloppy or promiscuous enzymes, but by cyclases capable of delivering precise regio- and stereospecificities.
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Affiliation(s)
- Rudranuj Bundela
- Ferrier
Research Institute, Victoria University
of Wellington, PO Box 600, Wellington 6140, New Zealand
- Maurice
Wilkins Centre for Molecular Biodiscovery, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
| | - Rosannah C. Cameron
- Ferrier
Research Institute, Victoria University
of Wellington, PO Box 600, Wellington 6140, New Zealand
- Maurice
Wilkins Centre for Molecular Biodiscovery, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
| | - A. Jonathan Singh
- Ferrier
Research Institute, Victoria University
of Wellington, PO Box 600, Wellington 6140, New Zealand
- Maurice
Wilkins Centre for Molecular Biodiscovery, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
| | - Rose M. McLellan
- Ferrier
Research Institute, Victoria University
of Wellington, PO Box 600, Wellington 6140, New Zealand
- Maurice
Wilkins Centre for Molecular Biodiscovery, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
| | - Alistair T. Richardson
- Ferrier
Research Institute, Victoria University
of Wellington, PO Box 600, Wellington 6140, New Zealand
- Maurice
Wilkins Centre for Molecular Biodiscovery, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
| | - Daniel Berry
- Ferrier
Research Institute, Victoria University
of Wellington, PO Box 600, Wellington 6140, New Zealand
- Maurice
Wilkins Centre for Molecular Biodiscovery, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
| | - Matthew J. Nicholson
- Ferrier
Research Institute, Victoria University
of Wellington, PO Box 600, Wellington 6140, New Zealand
| | - Emily J. Parker
- Ferrier
Research Institute, Victoria University
of Wellington, PO Box 600, Wellington 6140, New Zealand
- Maurice
Wilkins Centre for Molecular Biodiscovery, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
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Ozaki T, Minami A, Oikawa H. Biosynthesis of indole diterpenes: a reconstitution approach in a heterologous host. Nat Prod Rep 2023; 40:202-213. [PMID: 36321441 DOI: 10.1039/d2np00031h] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Covering: 2013 to 2022In this review, we provide an overview elucidating the biosynthetic pathway and heterologous production of fungal indole diterpenes (IDTs). Based on the studies of six IDT biosynthesis, we extracted nature's strategy: (1) two-stage synthesis for the core scaffold and platform intermediates, and (2) late-stage modifications for installing an additional cyclic system on the indole ring. Herein, we describe reconstitution studies applying this strategy to the synthesis of highly elaborated IDTs. We also discuss its potential for future biosynthetic engineering.
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Affiliation(s)
- Taro Ozaki
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan.
| | - Atsushi Minami
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan.
| | - Hideaki Oikawa
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan. .,Innovation Center of Marine Biotechnology and Pharmaceuticals, School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, 529020, Guangdong, China.
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Richardson AT, Cameron RC, Stevenson LJ, Singh AJ, Lukito Y, Berry D, Nicholson MJ, Parker EJ. Biosynthesis of Nodulisporic Acids: A Multifunctional Monooxygenase Delivers a Complex and Highly Branched Array. Angew Chem Int Ed Engl 2022; 61:e202213364. [PMID: 36199176 PMCID: PMC10098816 DOI: 10.1002/anie.202213364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Indexed: 11/11/2022]
Abstract
Nodulisporic acids (NAs) are structurally complex potent antiinsectan indole diterpenes. We previously reported the biosynthetic gene cluster for these metabolites in Hypoxylon pulicicidum and functionally characterised the first five steps of the biosynthetic pathway. Here we reveal a highly complex biosynthetic array, furnishing multiple end products through expression of cluster components in Penicillium paxilli. We show that seven additional cluster-encoded gene products comprise the biosynthetic machinery that elaborate precursor NAF in this highly branched pathway. The combined action of these enzymes delivers 37 NA congeners including four major end products, NAA, NAA1 , NAA2 and NAA4 . The plethora of intermediates arises due to modification of the carboxylated prenyl tail by a single promiscuous P450 monooxygenase, NodJ, a pivotal branchpoint enzyme which produces four distinct biosynthetic products giving rise to the complex metabolic grid that characterises NA biosynthesis.
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Affiliation(s)
- Alistair T. Richardson
- Ferrier Research Institute Victoria University of Wellington Wellington 6012 New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery New Zealand
- Centre for Biodiscovery School of Biological Sciences Victoria University of Wellington Wellington 6012 New Zealand
| | - Rosannah C. Cameron
- Ferrier Research Institute Victoria University of Wellington Wellington 6012 New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery New Zealand
- Centre for Biodiscovery School of Biological Sciences Victoria University of Wellington Wellington 6012 New Zealand
| | - Luke J. Stevenson
- Ferrier Research Institute Victoria University of Wellington Wellington 6012 New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery New Zealand
- Centre for Biodiscovery School of Biological Sciences Victoria University of Wellington Wellington 6012 New Zealand
| | - A. Jonathan Singh
- Ferrier Research Institute Victoria University of Wellington Wellington 6012 New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery New Zealand
- Centre for Biodiscovery School of Biological Sciences Victoria University of Wellington Wellington 6012 New Zealand
| | - Yonathan Lukito
- Ferrier Research Institute Victoria University of Wellington Wellington 6012 New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery New Zealand
- Centre for Biodiscovery School of Biological Sciences Victoria University of Wellington Wellington 6012 New Zealand
| | - Daniel Berry
- Ferrier Research Institute Victoria University of Wellington Wellington 6012 New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery New Zealand
- Centre for Biodiscovery School of Biological Sciences Victoria University of Wellington Wellington 6012 New Zealand
| | - Matthew J. Nicholson
- Wellington Univentures Victoria University of Wellington Wellington 6012 New Zealand
| | - Emily J. Parker
- Ferrier Research Institute Victoria University of Wellington Wellington 6012 New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery New Zealand
- Centre for Biodiscovery School of Biological Sciences Victoria University of Wellington Wellington 6012 New Zealand
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Kankanamge S, Khalil ZG, Bernhardt PV, Capon RJ. Noonindoles A-F: Rare Indole Diterpene Amino Acid Conjugates from a Marine-Derived Fungus, Aspergillus noonimiae CMB-M0339. Mar Drugs 2022; 20:698. [PMID: 36355021 PMCID: PMC9694122 DOI: 10.3390/md20110698] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 10/31/2022] [Accepted: 11/04/2022] [Indexed: 05/31/2024] Open
Abstract
Analytical scale chemical/cultivation profiling prioritized the Australian marine-derived fungus Aspergillus noonimiae CMB-M0339. Subsequent investigation permitted isolation of noonindoles A-F (5-10) and detection of eight minor analogues (i-viii) as new examples of a rare class of indole diterpene (IDT) amino acid conjugate, indicative of an acyl amino acid transferase capable of incorporating a diverse range of amino acid residues. Structures for 5-10 were assigned by detailed spectroscopic and X-ray crystallographic analysis. The metabolites 5-14 exhibited no antibacterial properties against G-ve and G+ve bacteria or the fungus Candida albicans, with the exception of 5 which exhibited moderate antifungal activity.
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Affiliation(s)
- Sarani Kankanamge
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, QLD 4072, Australia
| | - Zeinab G. Khalil
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, QLD 4072, Australia
| | - Paul V. Bernhardt
- School of Chemistry and Molecular Bioscience, The University of Queensland, St Lucia, QLD 4072, Australia
| | - Robert J. Capon
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, QLD 4072, Australia
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Hill RA, Sutherland A. Hot off the Press. Nat Prod Rep 2022. [PMID: 35708284 DOI: 10.1039/d2np90019j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A personal selection of 32 recent papers is presented covering various aspects of current developments in bioorganic chemistry and novel natural products such as chevalinulin A from Aspergillus chevalieri.
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Affiliation(s)
- Robert A Hill
- School of Chemistry, Glasgow University, Glasgow, UK, G12 8QQ.
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