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Wang B, Li X, Tabudravu J, Wang S, Deng H, Pan L. The chemical profile of activated secondary metabolites by overexpressing LaeA in Aspergillus niger. Microbiol Res 2021; 248:126735. [PMID: 33706119 DOI: 10.1016/j.micres.2021.126735] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Revised: 02/04/2021] [Accepted: 02/20/2021] [Indexed: 11/19/2022]
Abstract
Although the mechanisms of regulating secondary metabolism by LaeA remains unclear, the synthesis of many secondary metabolites (SMs) in Aspergilli could be activated by LaeA mutation. In our previous sutdy, RNA-seq data has showed that the transcriptional level of many SM backbone genes could be upregulated by overexpressing LaeA. Herein, we analyzed the chemical profile of activated secondary metabolites in the variant of A. niger FGSC A1279 by overexpressing LaeA (OElaeA). 14 compounds were activated in A. niger FGSC A1279 OElaeA variant in the WATM medium. Chemical workup of organic extracts of the culture broth from the A. niger OElaeA mutant identified three pure compounds, flaviolin, orlandin and kotanin. The structures of these compounds were confirmed by HR-ESIMS, 1D/2D NMR, and computer assisted structure elucidation (CASE). Based on homologous alignment and comparison of literatures, the biosynthetic gene cluster (fla) of flaviolin was identified. The in vivo function of the backbone gene, flaA, encoding a multidomain non-reducing polyketide synthase (SAT-KS-AT-PT-ACP), was verified via gene knockout and chemical analysis. Finally, a biosynthetic model for fungal flaviolin was proposed.
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Affiliation(s)
- Bin Wang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou, 510006, China; Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou, 510006, China
| | - Xuejie Li
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou, 510006, China; Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou, 510006, China
| | - Jioji Tabudravu
- Marine Biodiscovery Centre, Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen, AB24 3UE, Scotland, UK; School of Forensic and Applied Sciences, Faculty of Science & Technology, University of Central Lancashire, Preston, Lancashire, PR1 2HE, UK
| | - Shan Wang
- Marine Biodiscovery Centre, Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen, AB24 3UE, Scotland, UK
| | - Hai Deng
- Marine Biodiscovery Centre, Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen, AB24 3UE, Scotland, UK.
| | - Li Pan
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou, 510006, China; Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou, 510006, China.
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