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Bidirectional Immunomodulatory Activities of Polysaccharides Purified From Pleurotus nebrodensis. Inflammation 2013; 37:83-93. [DOI: 10.1007/s10753-013-9714-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Chai R, Qiu C, Liu D, Qi Y, Gao Y, Shen J, Qiu L. β-Glucan synthase gene overexpression and β-glucans overproduction in Pleurotus ostreatus using promoter swapping. PLoS One 2013; 8:e61693. [PMID: 23637884 PMCID: PMC3634845 DOI: 10.1371/journal.pone.0061693] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2012] [Accepted: 03/13/2013] [Indexed: 11/19/2022] Open
Abstract
Mushroom β-glucans are potent immunological stimulators in medicine, but their productivities are very low. In this study, we successfully improved its production by promoter engineering in Pleurotus ostreatus. The promoter for β-1,3-glucan synthase gene (GLS) was replaced by the promoter of glyceraldehyde-3-phosphate dehydrogenase gene of Aspergillus nidulans. The homologous recombination fragment for swapping GLS promoter comprised five segments, which were fused by two rounds of combined touchdown PCR and overlap extension PCR (TD-OE PCR), and was introduced into P. ostreatus through PEG/CaCl2-mediated protoplast transformation. The transformants exhibited one to three fold higher transcription of GLS gene and produced 32% to 131% higher yield of β-glucans than the wild type. The polysaccharide yields had a significant positive correlation to the GLS gene expression. The infrared spectra of the polysaccharides all displayed the typical absorption peaks of β-glucans. This is the first report of successful swapping of promoters in filamentous fungi.
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Affiliation(s)
- Ran Chai
- College of Life Sciences, Henan Agricultural University, Zhengzhou, People's Republic of China
- Key Laboratory of Enzyme Engineering of Agricultural Microbiology, Ministry of Agriculture, Zhengzhou, People's Republic of China
| | - Cuiwei Qiu
- College of Life Sciences, Henan Agricultural University, Zhengzhou, People's Republic of China
- Key Laboratory of Enzyme Engineering of Agricultural Microbiology, Ministry of Agriculture, Zhengzhou, People's Republic of China
| | - Dongren Liu
- College of Life Sciences, Henan Agricultural University, Zhengzhou, People's Republic of China
- Key Laboratory of Enzyme Engineering of Agricultural Microbiology, Ministry of Agriculture, Zhengzhou, People's Republic of China
| | - Yuancheng Qi
- College of Life Sciences, Henan Agricultural University, Zhengzhou, People's Republic of China
- Key Laboratory of Enzyme Engineering of Agricultural Microbiology, Ministry of Agriculture, Zhengzhou, People's Republic of China
| | - Yuqian Gao
- College of Life Sciences, Henan Agricultural University, Zhengzhou, People's Republic of China
- Key Laboratory of Enzyme Engineering of Agricultural Microbiology, Ministry of Agriculture, Zhengzhou, People's Republic of China
| | - Jinwen Shen
- College of Life Sciences, Henan Agricultural University, Zhengzhou, People's Republic of China
- Key Laboratory of Enzyme Engineering of Agricultural Microbiology, Ministry of Agriculture, Zhengzhou, People's Republic of China
| | - Liyou Qiu
- College of Life Sciences, Henan Agricultural University, Zhengzhou, People's Republic of China
- Key Laboratory of Enzyme Engineering of Agricultural Microbiology, Ministry of Agriculture, Zhengzhou, People's Republic of China
- * E-mail:
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