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Nord C, Levenfors JJ, Bjerketorp J, Guss B, Öberg B, Broberg A. Tetramic acid based alkaloids from Aspergillus amoenus Roberg strain UP197 - antibiotic properties and new pyranterreones. Nat Prod Res 2020; 36:967-973. [PMID: 33280415 DOI: 10.1080/14786419.2020.1855643] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The fungus Aspergillus amoenus Roberg strain UP197 was shown to produce antibacterial tetramic acid based alkaloids. Two new compounds, pyranterreone I and J (1 and 2), were isolated and characterized, in addition to the known compounds cordylactam, 7-hydroxycordylactam, pyranterreone C, D, F and G. Neither the pyranterreones nor the cordylacctams had previously been tested for antimicrobial activity. Thus, all isolated compounds were tested against a panel of clinically important bacteria and fungi. Pyranterreone C was active against Gram-positive and Gram-negative bacteria, with minimal inhibitory concentrations (MIC) between 1 and 8 µg/mL, whereas the MICs for all other compounds were >32 µg/mL. Pyranoterreone C was cytotoxic towards HepG2 cells, and since pyranterreone C reacted rapidly with the nucleophile cysteine, it is likely that the observed antibacterial activity is due to the chemical reactivity rather than enzymatic affinity, making it unsuitable for development as an antibacterial drug.
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Affiliation(s)
- Christina Nord
- Department of Molecular Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Jolanta J Levenfors
- Department of Molecular Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden.,Ultupharma AB, Uppsala, Sweden
| | - Joakim Bjerketorp
- Department of Molecular Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden.,Ultupharma AB, Uppsala, Sweden
| | - Bengt Guss
- Department of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Bo Öberg
- Ultupharma AB, Uppsala, Sweden.,Department of Medicinal Chemistry, Uppsala University, Uppsala, Sweden
| | - Anders Broberg
- Department of Molecular Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden
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Tang S, Zhang W, Li Z, Li H, Geng C, Huang X, Lu X. Discovery and Characterization of a PKS-NRPS Hybrid in Aspergillus terreus by Genome Mining. JOURNAL OF NATURAL PRODUCTS 2020; 83:473-480. [PMID: 32077283 DOI: 10.1021/acs.jnatprod.9b01140] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Fungal polyketide synthase-nonribosomal peptide synthetase (PKS-NRPS) hybrids have been characterized to produce polyketide-amino acid compounds with striking structural features and biological activities. In this study, a PKS-NRPS hybrid enzyme was found in Aspergillus terreus by genome mining. By activating the cluster-specific transcriptional regulator, this cryptic PKS-NRPS gene cluster was successfully activated and ten products (1-10) were identified as pyranterreones. Using functional genetics, bioinformatics, and isotope-labeling feeding analysis, the biosynthetic pathway was revealed. This is the second PKS-NRPS hybrid identified in A. terreus.
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Affiliation(s)
- Shen Tang
- College of Bioscience and Bioengineering, Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources , Jiangxi Agricultural University , Nanchang 330045 , People's Republic of China
- Shandong Provincial Key Laboratory of Synthetic Biology , Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , No. 189 Songling Road , Qingdao 266101 , People's Republic of China
| | - Wei Zhang
- Shandong Provincial Key Laboratory of Synthetic Biology , Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , No. 189 Songling Road , Qingdao 266101 , People's Republic of China
| | - Zhimin Li
- College of Bioscience and Bioengineering, Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources , Jiangxi Agricultural University , Nanchang 330045 , People's Republic of China
| | - Hongcheng Li
- College of Bioscience and Bioengineering, Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources , Jiangxi Agricultural University , Nanchang 330045 , People's Republic of China
- Shandong Provincial Key Laboratory of Synthetic Biology , Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , No. 189 Songling Road , Qingdao 266101 , People's Republic of China
| | - Ce Geng
- Shandong Provincial Key Laboratory of Synthetic Biology , Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , No. 189 Songling Road , Qingdao 266101 , People's Republic of China
| | - Xuenian Huang
- Shandong Provincial Key Laboratory of Synthetic Biology , Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , No. 189 Songling Road , Qingdao 266101 , People's Republic of China
| | - Xuefeng Lu
- Shandong Provincial Key Laboratory of Synthetic Biology , Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , No. 189 Songling Road , Qingdao 266101 , People's Republic of China
- Key Laboratory of Biofuels , Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , No. 189 Songling Road , Qingdao 266101 , People's Republic of China
- Marine Biology and Biotechnology Laboratory , Qingdao National Laboratory for Marine Science and Technology , Wenhai Rd 1, Aoshanwei , Qingdao 266237 , People's Republic of China
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