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Chen S, Tong Q, Guo X, Cong H, Zhao Z, Liang W, Li J, Zhu P, Yang H. Complete secretion of recombinant Bacillus subtilis levansucrase in Pichia pastoris for production of high molecular weight levan. Int J Biol Macromol 2022; 214:203-211. [PMID: 35714864 DOI: 10.1016/j.ijbiomac.2022.06.092] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 06/03/2022] [Accepted: 06/12/2022] [Indexed: 11/17/2022]
Abstract
Three signal peptides from α-mating factor (α-MF), inulinase (INU) and native levansucrase (LS) were compared for secretion efficiency of Bacillus subtilis levansucrase SacB-T305A in Pichia pastoris GS115. The first complete secretion of bacterial levansucrase in yeasts under methanol induction was achieved while using α-MF signal. The secreted recombinant Lev(α-MF) proved to be glycosylated by combination of NanoLC-MS/MS and Endo H digestion. Interestingly, glycosylation not only improved significantly the polymerase thermostability, but also reversed the products profiles to favor synthesis of high molecular weight (HMW) levan which accounted for approximately 73 % to total levan-type polysaccharides. It indicated for the first time that the glycosylation of recombinant B. subtilis levansucrase affected significantly the products molecular weight distribution. It also provided a promising enzymatic way to effectively product HMW levan from sucrose resources.
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Affiliation(s)
- Shuochang Chen
- College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi 530004, China; State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, 100 Daxue Road, Nanning, Guangxi 530004, China; Guangxi Research Center for Microbial and Enzyme Engineering Technology, 100 Daxue Road, Nanning, Guangxi 530004, China
| | - Qiuping Tong
- College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi 530004, China
| | - Xiaolei Guo
- College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi 530004, China; State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, 100 Daxue Road, Nanning, Guangxi 530004, China; Guangxi Research Center for Microbial and Enzyme Engineering Technology, 100 Daxue Road, Nanning, Guangxi 530004, China
| | - Hao Cong
- College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi 530004, China
| | - Zi Zhao
- College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi 530004, China; State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, 100 Daxue Road, Nanning, Guangxi 530004, China; Guangxi Research Center for Microbial and Enzyme Engineering Technology, 100 Daxue Road, Nanning, Guangxi 530004, China
| | - Wenfeng Liang
- College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi 530004, China; State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, 100 Daxue Road, Nanning, Guangxi 530004, China; Guangxi Research Center for Microbial and Enzyme Engineering Technology, 100 Daxue Road, Nanning, Guangxi 530004, China
| | - Jiemin Li
- Agro-food Science and Technology Research Institute, Guangxi Academy of Agricultural Sciences, 174 East Daxue Road, Nanning, Guangxi 530007, China
| | - Ping Zhu
- College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi 530004, China
| | - Hui Yang
- College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi 530004, China; State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, 100 Daxue Road, Nanning, Guangxi 530004, China; Guangxi Research Center for Microbial and Enzyme Engineering Technology, 100 Daxue Road, Nanning, Guangxi 530004, China.
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Molecular modification, expression and purification of new subtype antioxidant peptide from Pinctada fucata by recombinant Escherichia coli to improve antioxidant-activity. Journal of Food Science and Technology 2018; 55:4266-4275. [PMID: 30228425 DOI: 10.1007/s13197-018-3365-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 06/26/2018] [Accepted: 07/30/2018] [Indexed: 02/06/2023]
Abstract
The aim of this study was to establish a system for the efficient expression and purification of new subtype of antioxidant peptide from Pinctada fucata meat (NPFMAP), which is designed by molecular modification technology based on the sequence of purified and identified antioxidant peptide from Pinctada fucata meat (PFMAP, Gly-Ala-Gly-Leu-Pro-Gly-Lys-Arg-Glu-Arg), and to better understand the relationship between structure and antioxidant activity. Meanwhile, gene codon usage was optimized and the glutathione S-transferase (GST) tag of pGEX-6P-1 was added to facilitate expression and purification NPFMAP in Escherichia coli. The results of antioxidant activity assay in vitro showed a higher antioxidant activity in NPFMAP than that in enzymatic hydrolysis digested or chemically synthesized PFMAP. In particular, the DPPH scavenging radical activity increased by about 4.7 times after molecular modification. Structural bioanalysis indicated that new subtype antioxidant peptide had spatial conformation and good hydrophilic after modification, which was confirmed by antioxidant activity assays. Thus, the proposed method could be used to obtain NPFMAP with high antioxidant activity.
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Huang G, Tang Y, Sun L, Xing H, Ma H, He R. Ultrasonic irradiation of low intensity with a mode of sweeping frequency enhances the membrane permeability and cell growth rate of Candida tropicalis. ULTRASONICS SONOCHEMISTRY 2017; 37:518-528. [PMID: 28427664 DOI: 10.1016/j.ultsonch.2017.02.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 02/09/2017] [Accepted: 02/10/2017] [Indexed: 06/07/2023]
Abstract
Here we report the enhancement of both cellular permeability and cell growth rate of Candida tropicalis after treatment with the ultrasonic irradiation of low intensity using a mode of sweeping frequency (UILS) generated by a self-developed ultrasonic device in our lab. After the ultrasonic treatment, remarkable biomass enhancement of the yeast was observed; the hyphae became significantly longer; the seeped cellular protein and nucleic acid from the yeast increased and the cellular Ca2+ content became lower. Illumina transcriptome sequencing showed that the ultrasonic treatment affected the expression of genes involved in diverse cellular components, biological processes and molecular functions. RT-PCR and Western blotting further confirmed the up-/down-regulation of genes in the ultrasound-treated yeasts. The optimal conditions of the ultrasonic treatment for the maximum biomass addition were determined as follows: the yeast was treated for 1h at the mid logarithmic phase, the frequency was 28±2kHz and the power density was 120W/L. Under these conditions, the Candida tropicalis biomass increased by 142.5% compared with the untreated yeast.
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Affiliation(s)
- Guoping Huang
- Institute of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
| | - Yingxiu Tang
- School of Food & Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
| | - Ling Sun
- School of Food & Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
| | - Huan Xing
- School of Food & Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
| | - Haile Ma
- School of Food & Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
| | - Ronghai He
- School of Food & Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.
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Liu B, Zhang Y, Zhang X, Yan C, Zhang Y, Xu X, Zhang W. Discovery of a rhamnose utilization pathway and rhamnose-inducible promoters in Pichia pastoris. Sci Rep 2016; 6:27352. [PMID: 27256707 PMCID: PMC4891683 DOI: 10.1038/srep27352] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 04/12/2016] [Indexed: 11/09/2022] Open
Abstract
The rhamnose utilization pathway in Pichia pastoris has not been clarified although this strain can grow well on rhamnose as a sole carbon source. In this study, four genes, PAS_chr4_0338, PAS_chr4_0339, PAS_chr4_0340, and PAS_chr4_0341, were, for the first time, predicted to be involved in rhamnose metabolism along with the previously identified gene PAS_chr1_4-0075. Moreover, expression of these genes, especially PAS_chr4_0341 and PAS_chr1_4-0075 designated as LRA4 and LRA3, was confirmed to significantly increase and clearly decrease in the presences of rhamnose and glucose, respectively. LRA4 encoding a putative L-2-keto-3-deoxyrhamnonate aldolase, was further confirmed via gene disruption and gene complementation to participate in rhamnose metabolism. Using β-galactosidase and green fluorescent protein as reporters, the promoters of LRA4 and LRA3 performed well in driving efficient production of heterologous proteins. By using food grade rhamnose instead of the toxic compound methanol as the inducer, the two promoters would be excellent candidates for driving the production of food-grade and therapeutically important recombinant proteins.
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Affiliation(s)
- Bo Liu
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Yuwei Zhang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Xue Zhang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Chengliang Yan
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Yuhong Zhang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Xinxin Xu
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Wei Zhang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
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Directed optimization of a newly identified squalene synthase from Mortierella alpine based on sequence truncation and site-directed mutagenesis. ACTA ACUST UNITED AC 2015; 42:1341-52. [DOI: 10.1007/s10295-015-1668-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 07/28/2015] [Indexed: 12/16/2022]
Abstract
Abstract
Terpenoids, a class of isoprenoids usually isolated from plants, are always used as commercial flavor and anticancer drugs. As a key precursor for triterpenes and sterols, biosynthesis of squalene (SQ) can be catalyzed by squalene synthase (SQS) from two farnesyl diphosphate molecules. In this work, the key SQS gene involved in sterols synthesis by Mortierella alpine, an industrial strain often used to produce unsaturated fatty acid such as γ-linolenic acid and arachidonic acid, was identified and characterized. Bioinformatic analysis indicated that MaSQS contained 416 amino acid residues involved in four highly conserved regions. Phylogenetic analysis revealed the closest relationship of MaSQS with Ganoderma lucidum and Aspergillus, which also belonged to the member of the fungus. Subsequently, the recombinant protein was expressed in Escherichia coli BL21(DE3) and detected by SDS-PAGE. To improve the expression and solubility of protein, 17 or 27 amino acids in the C-terminal were deleted. In vitro activity investigation based on gas chromatography–mass spectrometry revealed that both the truncated enzymes could functionally catalyze the reaction from FPP to SQ and the enzymatic activity was optimal at 37 °C, pH 7.2. Moreover, based on the site-directed mutagenesis, the mutant enzyme mMaSQSΔC17 (E186K) displayed a 3.4-fold improvement in catalytic efficiency (k cat/K m) compared to the control. It was the first report of characterization and modification of SQS from M. alpine, which facilitated the investigation of isoprenoid biosynthesis in the fungus. The engineered mMaSQSΔC17 (E186K) can be a potential candidate of the terpenes and steroids synthesis employed for synthetic biology.
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