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Breyer D, Chen L, Zhou J, Li ZH, Li SM. Expression of a Colletotrichum polyketide synthase gene in Aspergillus nidulans leads to unexpected conjugates with a host metabolite. Arch Microbiol 2025; 207:52. [PMID: 39912893 PMCID: PMC11802603 DOI: 10.1007/s00203-025-04258-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2024] [Revised: 01/23/2025] [Accepted: 01/29/2025] [Indexed: 02/07/2025]
Abstract
Heterologous expression of the putative 1,3,6,8-tetrahydroxynaphthalene synthase gene ChPKS from Colletotrichum higginsianum in Aspergillus nidulans led to the formation of at least eight new compounds. LC-MS analysis proved them as coupling products of 1,3,6,8-tetrahydroxynaphthalene with an intermediate of the cichorine biosynthetic pathway. Comprehensive NMR analysis confirmed the structures of the two predominant products higginidulans A and B. Deletion of the backbone gene of the cichorine pathway in host strain Aspergillus nidulans abolished the formation of higginidulans. Heterologous expression of ChPKS in the alternative Penicillium crustosum expression host resulted in the formation of the expected product 1,3,6,8-tetrahydroxynaphthalene, which was confirmed by acetylation and structural elucidation. This study provides an additional example of unexpected natural product formation by crosstalk of biosynthetic pathways derived from different species. Moreover, it highlights the importance of using alternative host systems for gene expression.
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Affiliation(s)
- David Breyer
- Institut für Pharmazeutische Biologie und Biotechnologie, Fachbereich Pharmazie, Philipps-Universität Marburg, Robert-Koch Straße 4, 35037, Marburg, Germany
| | - Leyao Chen
- Institut für Pharmazeutische Biologie und Biotechnologie, Fachbereich Pharmazie, Philipps-Universität Marburg, Robert-Koch Straße 4, 35037, Marburg, Germany
| | - Jenny Zhou
- Institut für Pharmazeutische Biologie und Biotechnologie, Fachbereich Pharmazie, Philipps-Universität Marburg, Robert-Koch Straße 4, 35037, Marburg, Germany
| | - Zhang-Hai Li
- Institut für Pharmazeutische Biologie und Biotechnologie, Fachbereich Pharmazie, Philipps-Universität Marburg, Robert-Koch Straße 4, 35037, Marburg, Germany
| | - Shu-Ming Li
- Institut für Pharmazeutische Biologie und Biotechnologie, Fachbereich Pharmazie, Philipps-Universität Marburg, Robert-Koch Straße 4, 35037, Marburg, Germany.
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Wang W, Zhang K, Lin C, Zhao S, Guan J, Zhou W, Ru X, Cong H, Yang Q. Influence of Cmr1 in the Regulation of Antioxidant Function Melanin Biosynthesis in Aureobasidium pullulans. Foods 2023; 12:2135. [PMID: 37297380 PMCID: PMC10252820 DOI: 10.3390/foods12112135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2023] [Revised: 05/18/2023] [Accepted: 05/23/2023] [Indexed: 06/12/2023] Open
Abstract
We have successfully identified the transcription factor Cmr1 from the fungus Aureobasidium pullulans Hit-lcy3T, which regulates melanin biosynthesis genes. Bioinformatics analysis revealed that the Cmr1 gene encodes a protein of 945 amino acids, containing two Cys2His2 zinc finger domains and a Zn(II)2Cys6 binuclear cluster domain located at the N-terminus of Cmr1. To investigate the function of the Cmr1 gene, we performed gene knockout and overexpression experiments. Our results showed that Cmr1 is a key regulator of melanin synthesis in Hit-lcy3T, and its absence caused developmental defects. Conversely, overexpression of Cmr1 significantly increased the number of chlamydospores in Hit-lcy3T and improved melanin production. RT-qPCR analysis further revealed that overexpression of Cmr1 enhanced the expression of several genes involved in melanin biosynthesis, including Cmr1, PKS, SCD1, and THR1. Melanin extracted from the Hit-lcy3T was characterized using UV and IR spectroscopy. Furthermore, we assessed the antioxidant properties of Hit-lcy3T melanin and found that it possesses strong scavenging activity against DPPH·, ABTS·, and OH·, but weaker activity against O2-·. These findings suggest that Hit-lcy3T melanin holds promise for future development as a functional food additive.
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Affiliation(s)
- Wan Wang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin 150006, China; (W.W.); (K.Z.); (J.G.); (W.Z.); (X.R.); (H.C.)
| | - Kai Zhang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin 150006, China; (W.W.); (K.Z.); (J.G.); (W.Z.); (X.R.); (H.C.)
| | - Congyu Lin
- National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, School of Food Science and Technology, Jiangnan University, Wuxi 214122, China;
| | - Shanshan Zhao
- Ocean College, Zhejiang University, Zhoushan 316000, China;
| | - Jiaqi Guan
- School of Life Science and Technology, Harbin Institute of Technology, Harbin 150006, China; (W.W.); (K.Z.); (J.G.); (W.Z.); (X.R.); (H.C.)
| | - Wei Zhou
- School of Life Science and Technology, Harbin Institute of Technology, Harbin 150006, China; (W.W.); (K.Z.); (J.G.); (W.Z.); (X.R.); (H.C.)
| | - Xin Ru
- School of Life Science and Technology, Harbin Institute of Technology, Harbin 150006, China; (W.W.); (K.Z.); (J.G.); (W.Z.); (X.R.); (H.C.)
| | - Hua Cong
- School of Life Science and Technology, Harbin Institute of Technology, Harbin 150006, China; (W.W.); (K.Z.); (J.G.); (W.Z.); (X.R.); (H.C.)
| | - Qian Yang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin 150006, China; (W.W.); (K.Z.); (J.G.); (W.Z.); (X.R.); (H.C.)
- State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbin 150090, China
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