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Zhao L, Li L, Hu M, Fang Y, Dong N, Shan A. Heterologous expression of the novel dimeric antimicrobial peptide LIG in Pichia pastoris. J Biotechnol 2024; 381:19-26. [PMID: 38181981 DOI: 10.1016/j.jbiotec.2023.12.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 12/27/2023] [Accepted: 12/29/2023] [Indexed: 01/07/2024]
Abstract
The antimicrobial peptide (AMP) LI is a fusion product of antimicrobial peptide LL37 produced by human neutrophils and Indolicidin secreted by bovine neutrophils. LI retained the antimicrobial activity of the parental peptides and showed high cell selectivity. In this study, the flexible linker Gly-Ser-Gly (G-S-G) was used to ligate LI into dimeric LIG, and constructed the Pichia pastoris (P. pastoris) expression vector pPIC9K-6×His-3×FLAG-LIG. The total protein expression of P. pastoris GS115 reached the highest level (189.6 mg/L) after 96 h induction with 3 % methanol at the initial pH value of 7.0. Finally, 5.9 mg/L of recombinant LIG (rLIG) was obtained after enterokinase digestion and purification. The rLIG had high antimicrobial activity and low hemolytic activity. Compared with monomer LI, GSG linked dimeric LIG, which had no significant change in antimicrobial activity and had good salt ions stability. In this study, the dimeric antimicrobial peptide LIG was successfully expressed, which provided a new idea for the expression of AMPs in the P. pastoris expression system, and had important significance for the application of AMPs.
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Affiliation(s)
- Lu Zhao
- Laboratory of Molecular Nutrition and Immunity, College of Animal Science and Technology, Northeast Agricultural University, Harbin, PR China
| | - Ling Li
- Laboratory of Molecular Nutrition and Immunity, College of Animal Science and Technology, Northeast Agricultural University, Harbin, PR China
| | - Mingyang Hu
- Laboratory of Molecular Nutrition and Immunity, College of Animal Science and Technology, Northeast Agricultural University, Harbin, PR China
| | - Yuxin Fang
- Laboratory of Molecular Nutrition and Immunity, College of Animal Science and Technology, Northeast Agricultural University, Harbin, PR China
| | - Na Dong
- Laboratory of Molecular Nutrition and Immunity, College of Animal Science and Technology, Northeast Agricultural University, Harbin, PR China.
| | - Anshan Shan
- Laboratory of Molecular Nutrition and Immunity, College of Animal Science and Technology, Northeast Agricultural University, Harbin, PR China
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Xu Y, Zhao Z, Geng Z, Zhou H, Yang C, Wang Y, Kuerban B, Xiao Y, Luo G. Enhancement of recombinant human interleukin-22 production by fusing with human serum albumin and supplementing N-acetylcysteine in Pichia Pastoris. Protein Expr Purif 2023; 212:106360. [PMID: 37652392 DOI: 10.1016/j.pep.2023.106360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 08/17/2023] [Accepted: 08/26/2023] [Indexed: 09/02/2023]
Abstract
Interleukin-22 (IL-22) plays an important role in the treatment of organ failure, which can induce anti-apoptotic and proliferative signaling pathways; Nevertheless, the practical utilization of IL-22 is hindered by the restricted efficacy of its production. Pichia pastoris presents a viable platform for both industrial and pharmaceutical applications. In this study, we successfully generated a fusion protein consisting of truncated human serum albumin and human IL-22 (HSA-hIL-22) using P. pastoris, and examined the impact of antioxidants on HSA-hIL-22 production. We have achieved the production of HSA-hIL-22 in the culture medium at a yield of approximately 2.25 mg/ml. Moreover, 0-40 mM ascorbic acid supplementation did not significantly affect HSA-hIL-22 production or the growth rate of the recombinant strain. However, 80 mM ascorbic acid treatment had a detrimental effect on the expression of HSA-hIL-22. In addition, 5-10 mM N-acetyl-l-cysteine (NAC) resulted in an increase of HSA-hIL-22 production, accompanied by a reduction in the growth rate of the recombinant strain. Conversely, 20-80 mM NAC supplementation inhibited the growth of the recombinant strains and reduced intact HSA-hIL-22 production. However, neither NAC nor ascorbic acid exhibited any effect on superoxide dismutase (SOD) and malondialdehyde (MDA) levels, except that NAC increased GSH content. Furthermore, our findings indicate that recombinant HSA-hIL-22, which demonstrated the ability to stimulate the proliferation of HepG2 cells, possesses bioactivity. In addition, NAC did not affect HSA-hIL-22 bioactivity. In conclusion, our study demonstrates that NAC supplementation can enhance the secretion of functional HSA-hIL-22 proteins produced in P. pastoris without compromising their activity.
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Affiliation(s)
- Yingqing Xu
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212100, China.
| | - Ziming Zhao
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212100, China.
| | - Zijian Geng
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212100, China.
| | - Hongwei Zhou
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212100, China.
| | - Chengxi Yang
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212100, China.
| | - Yixing Wang
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212100, China.
| | - Buayisham Kuerban
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212100, China.
| | - Yimeng Xiao
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212100, China.
| | - Gang Luo
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212100, China.
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Xu Y, Geng Z, Yang C, Zhou H, Wang Y, Kuerban B, Luo G. Effect of N-acetyl-l-cysteine on Cell Phenotype and Autophagy in Pichia pastoris Expressing Human Serum Albumin and Porcine Follicle-Stimulating Hormone Fusion Protein. Molecules 2023; 28:molecules28073041. [PMID: 37049804 PMCID: PMC10095845 DOI: 10.3390/molecules28073041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 03/26/2023] [Accepted: 03/27/2023] [Indexed: 04/14/2023] Open
Abstract
Pichia pastoris is widely used for the production of recombinant proteins, but the low secretion efficiency hinders its wide application in biopharmaceuticals. Our previous study had shown that N-acetyl-l-cysteine (NAC) promotes human serum albumin and porcine follicle-stimulating hormone fusion protein (HSA-pFSHβ) secretion by increasing intracellular GSH levels, but the downstream impact mechanism is not clear. In this study, we investigated the roles of autophagy as well as cell phenotype in NAC promoting HSA-pFSHβ secretion. Our results showed that NAC slowed down the cell growth rate, and its effects were unaffected by Congo Red and Calcofluor White. Moreover, NAC affected cell wall composition by increasing chitin content and decreasing β-1,3-glucan content. In addition, the expressions of vesicular pathway and autophagy-related genes were significantly decreased after NAC treatment. Further studies revealed that autophagy, especially the cytoplasm-to-vacuole targeting (Cvt) pathway, mitophagy and pexophagy, was significantly increased with time, and NAC has a promoting effect on autophagy, especially at 48 h and 72 h of NAC treatment. However, the disruption of mitophagy receptor Atg32, but not pexophagy receptor Atg30, inhibited HSA-pFSHβ production, and neither of them inhibited the NAC-promoted effect of HSA-pFSHβ. In conclusion, vesicular transport, autophagy and cell wall are all involved in the NAC-promoted HSA-pFSHβ secretion and that disruption of the autophagy receptor alone does not inhibit the effect of NAC.
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Affiliation(s)
- Yingqing Xu
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China
| | - Zijian Geng
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China
| | - Chengxi Yang
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China
| | - Hongwei Zhou
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China
| | - Yixing Wang
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China
| | - Buayisham Kuerban
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China
| | - Gang Luo
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China
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Luo G, Geng Z, Kuerban B, Xu Y, Yang J, Liu J, Li M. Enhancement of HSA-pFSHβ production by disrupting YPS1 and supplementing N-acetyl-L-cysteine in Pichia pastoris. Front Microbiol 2022; 13:998647. [PMID: 36620033 PMCID: PMC9810807 DOI: 10.3389/fmicb.2022.998647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 12/05/2022] [Indexed: 12/24/2022] Open
Abstract
Introduction Pichia pastoris is widely used for the production of recombinant proteins, but the low production efficiency hinders its wide application in biopharmaceuticals. Moreover, many biopharmaceutical-like proteins are accompanied by degradation during secretory expression in P. pastoris. Objective In this study, we used human serum albumin and porcine follicle-stimulating hormone β (HSA-pFSHβ) fusion protein as a model protein to investigate whether YPS1 and YPT7 gene disruption and N-acetyl-L-cysteine (NAC) supplementation have synergistic effects to inhibit the degradation of recombinant proteins. Results and discussion Our results showed that YPS1 gene disruption reduced the degradation of intact HSA-pFSHβ and increased the yield of intact protein in the culture medium and cells without affecting the integrity of the cell wall. Moreover, the beneficial effects of YPS1 gene disruption were associated with the upregulation of the MAPK signaling pathway and maintenance of redox homeostasis. YPS1 gene disruption and NAC supplementation had synergistic effects on HSA-pFSHβ production. In addition, disruption of vacuolar morphology by YPT7 gene disruption or NH4Cl treatment affected the production of recombinant HSA-pFSHβ protein. Furthermore, YPT7 gene disruption inhibited the processing of signal peptide in high-level produced HSA-pFSHβ strain. In conclusion, our results demonstrated that YPS1 disruption could reduce the degradation of intact HSA-pFSHβ proteins, and synergistically increase the yield of intact HSA-pFSHβ with NAC supplementation. This study provided a valuable reference for reducing recombinant protein degradation and therefore improving the yield of recombinant proteins in P. pastoris.
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Affiliation(s)
- Gang Luo
- Jiangsu Key Laboratory of Sericultural Biology and Biotechnology, School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, China
| | - Zijian Geng
- Jiangsu Key Laboratory of Sericultural Biology and Biotechnology, School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, China
| | - Buayisham Kuerban
- Jiangsu Key Laboratory of Sericultural Biology and Biotechnology, School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, China
| | - Yingqing Xu
- Jiangsu Key Laboratory of Sericultural Biology and Biotechnology, School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, China
| | - Jingjing Yang
- Jiangsu Guiliu Animal Husbandry Group Co., Ltd., Xuzhou, Jiangsu, China
| | - Jiying Liu
- Jiangsu Key Laboratory of Sericultural Biology and Biotechnology, School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, China
| | - Muwang Li
- Jiangsu Key Laboratory of Sericultural Biology and Biotechnology, School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, China,Jiangsu Guiliu Animal Husbandry Group Co., Ltd., Xuzhou, Jiangsu, China,*Correspondence: Muwang Li,
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Huo X, Wang Z, Xiao X, Yang C, Su J. Nanopeptide CMCS-20H loaded by carboxymethyl chitosan remarkably enhances protective efficacy against bacterial infection in fish. Int J Biol Macromol 2022; 201:226-241. [PMID: 34995671 DOI: 10.1016/j.ijbiomac.2021.12.172] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Revised: 12/10/2021] [Accepted: 12/27/2021] [Indexed: 01/21/2023]
Affiliation(s)
- Xingchen Huo
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China; Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China; Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan 430070, China
| | - Zhensheng Wang
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China
| | - Xun Xiao
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China
| | - Chunrong Yang
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Jianguo Su
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China; Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China; Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan 430070, China.
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Huo X, Wang Z, Xiao X, Yang C, Su J. Oral Administration of Nanopeptide CMCS-20H Conspicuously Boosts Immunity and Precautionary Effect Against Bacterial Infection in Fish. Front Immunol 2022; 12:811616. [PMID: 35087530 PMCID: PMC8786714 DOI: 10.3389/fimmu.2021.811616] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 12/13/2021] [Indexed: 12/26/2022] Open
Abstract
Massive mortalities caused by bacterial infections in intensive aquaculture result in serious economic losses. In this study, a novel antimicrobial peptide gcIFN-20H was efficiently expressed in Pichia pastoris (GS115) and loaded on carboxylmethyl chitosan (CMCS) to prepare CMCS-20H nanoparticles. Through physical characterization assays (TEM, DLS, BCA, and Raman) and biological activity tests (antimicrobial activity and cytotoxicity), CMCS-20H nanopeptide was verified to be spherical nanoparticles with sustained release, antimicrobial activity, and negligible toxicity. CMCS-20H nanoparticles are more resistant to intestinal degradation than unloaded gcIFN-20H by indirect immunofluorescence assay. Oral administration was then carried out for 42 days. Complement C3 content, lysozyme, and total superoxide dismutase activities are highest in CMCS-20H group by serum biochemistry index assays. After challenge with Aeromonas hydrophila, the survival rate in CMCS-20H group is highest (46%), which is 64% higher than the control group (28%). Meanwhile, the tissue bacterial loads (intestine, spleen, head kidney, trunk kidney, hepatopancreas, muscle, and blood) in the CMCS-20H group are significantly lower than other groups. By PAS staining analysis, the number of intestinal villi goblet cells and the thickness of mucin in the CMCS-20H group obviously increased. CMCS-20H effectively enhances mRNA expressions of some important immune genes (IL-1β, IL-6, TNF-α, IL-2, IFN-γ2, and IgM). The minimal tissue lesions (Intestine, spleen, and trunk kidney) were seen in the CMCS-20H group by histopathological examination. 16S rRNA sequencing showed that oral CMCS-20H maintains the intestinal microbiome homeostasis in bacterial infection. The results indicate that the novel nanopeptide CMCS-20H as the immunopotentiator can remarkably boost fish immunity and precautionary effect by oral administration and address the theoretical mechanisms and insights into the promising application prospect in aquaculture.
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Affiliation(s)
- Xingchen Huo
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, China.,Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China.,Hubei Hongshan Laboratory, Engineering Research Center of Green Development for Conventional Aquatic Biological Industry in the Yangtze River Economic Belt, Ministry of Education, Wuhan, China
| | - Zhensheng Wang
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, China
| | - Xun Xiao
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, China
| | - Chunrong Yang
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Jianguo Su
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, China.,Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China.,Hubei Hongshan Laboratory, Engineering Research Center of Green Development for Conventional Aquatic Biological Industry in the Yangtze River Economic Belt, Ministry of Education, Wuhan, China
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7
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Luo G, Liu J, Bian T, Zhang Z, Li M. The mechanism of N-acetyl-l-cysteine in improving the secretion of porcine follicle-stimulating hormone in Pichia pastoris. Yeast 2021; 38:601-611. [PMID: 34486746 DOI: 10.1002/yea.3668] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 06/24/2021] [Accepted: 08/23/2021] [Indexed: 12/15/2022] Open
Abstract
Our previous study revealed that N-acetyl-l-cysteine (NAC) could enhance the secretion of recombinant proteins by Pichia pastoris, but the corresponding molecular mechanisms are still unclear. In the present study, we explored whether other thiols have a similar action on the secretion of recombinant human serum albumin and porcine follicle-stimulating hormone fusion protein (HSA-pFSHβ), to reveal the mechanism of NAC on HSA-pFSHβ secretion. Transcriptome analysis showed that genes involved in oxidoreductase activity and oxidation-reduction process were upregulated in cells supplemented with NAC. The other three thiol-reducing regents including dimercaptopropanol (DT), thioglycolic acid, and mercaptolactic acid could improve HSA-pFSHβ production in the culture supernatant. Among them, only DT had similar effect as NAC on HSA-pFSHβ secretion and the increase of GSH content. Moreover, 1-20 mM GSH, 1-10 mM cysteine, or 1-20 mM N-acetyl-d-cysteine supplementation could improve the secretion of HSA-pFSHβ. Furthermore, 0.4-3.2 mM ethacrynic acid, rather than 1-16 mM BSO could inhibit the effect of NAC on the production of HSA-pFSHβ. These results indicated that NAC improved the secretion of HSA-pFSHβ by increasing the intracellular GSH content through its thiol activity rather than as a precursor for GSH synthesis. In conclusion, our results demonstrate, for the first time, that the secretion of recombinant HSA-pFSHβ in Pichia pastoris could be improved through thiol-reducing agent supplementation, and the mechanism of the effect NAC has on HSA-pFSHβ secretion is associated with improving the intracellular GSH content.
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Affiliation(s)
- Gang Luo
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu Province, China
| | - Jiying Liu
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu Province, China
| | - Ting Bian
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu Province, China
| | - Zhendong Zhang
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu Province, China
| | - Muwang Li
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu Province, China
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Hua R, Liu J, Li Y, Fan Y, Zeng B, Geng G, Li Q. Novel Functional Recombinant Human Follicle-Stimulating Hormone Acquired from Goat Milk. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:2793-2804. [PMID: 33645971 DOI: 10.1021/acs.jafc.0c07208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
An animal mammary bioreactor is regarded as an excellent biological system which is applied to produce large-scale recombinant proteins in milk. However, there are no effective methods to produce a large amount of some pharmaceutical proteins, such as human follicle-stimulating hormone (FSH), by large animal mammary gland bioreactors due to the fact that accumulation of excessive bioactive FSH might cause serious diseases in animals. Here, we report a novel strategy of preparing recombinant human FSH (rhFSH) from goat mammary glands, which could avoid the accumulation of bioactive FSH in goats. First, the single inactive FSHα and FSHβ subunits expressed in goat mammary epithelial cells and goat mammary glands were performed to reassemble in vitro and were found to self-assemble into a complete heterodimer rhFSH at 4 °C and pH 7.4. Further, a cyclic adenosine monophosphate (cAMP) induction assay showed that the cAMP levels in cell lysate of HEK 293/FSHR cells were increased by about 8-fold in reassembled rhFSH groups than that in the control group (P < 0.01). Pharmacokinetic analysis indicated that the reassembled rhFSH from goat mammary glands was comparable to that of the commercially available Gonal-F (P > 0.05). In addition, the increasing dose of reassembled rhFSH significantly promoted ovulation of mouse and ovary weight gain of Sprague Dawley rat compared with the control groups and maximum values were up to 3-fold (P < 0.01) and 2.8-fold (P < 0.01), respectively. The reassembled rhFSH showed a similar effect to Gonal-F in inducing expression of FSH target genes in vivo and activating the PI3K pathway in granulosa cells. Our study developed a novel method to produce rhFSH and provided the basis for preparing FSH by the goat mammary gland bioreactor with less health problems on the producing animals.
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Affiliation(s)
- Rongmao Hua
- College of Animal Science and Technology, Northwest A&F University, Yangling 712100, P. R. China
| | - Jianxi Liu
- Institute of Special Environmental Medicine, Nantong University, Nantong 226019, P. R. China
| | - Yuan Li
- College of Animal Science and Technology, Northwest A&F University, Yangling 712100, P. R. China
| | - Yan Fan
- College of Life Science, Jiangxi Science & Technology Normal University, Nanchang 330013, P. R. China
| | - Bin Zeng
- College of Life Science, Jiangxi Science & Technology Normal University, Nanchang 330013, P. R. China
| | - Guoxia Geng
- College of Veterinary Medicine, Northwest Agriculture and Forestry University, Yangling 712100, P. R. China
| | - Qingwang Li
- College of Animal Science and Technology, Northwest A&F University, Yangling 712100, P. R. China
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Zhao J, Wang L, Wei X, Li K, Liu J. Food-Grade Expression and Characterization of a Dextranase from Chaetomium gracile Suitable for Sugarcane Juice Clarification. Chem Biodivers 2020; 18:e2000797. [PMID: 33245200 DOI: 10.1002/cbdv.202000797] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Accepted: 11/26/2020] [Indexed: 11/09/2022]
Abstract
The microbial production of dextranase using cheap carbon sources is beneficial to solve the economic loss caused by the accumulation of dextran in syrup. A food-grade microbial cell factory was constructed by introducing the dextranase encoding gene DEX from Chaetomium gracile to the chromosome of Bacillus subtilis, and the antibiotic resistance marker gene was subsequently deleted via the Cre/loxP strategy. The dual-promoter system with a sequentially arranged constitutive P43 promoter resulted in an 85 % increase in DEX expression. Under the optimal fermentation conditions of 10 g/L maltose, 15 g/L casein, 1 g/L Na2 HPO4 , 1 g/L FeSO4 and 8 g/L NaCl, DEX activity was increased from 2.625 to 64.34 U/mL. Recombinant DEX was purified 5.98-fold with a recovery ratio of 26.67 % and specific activity of 3935.02 U/mg. Enzyme activity was optimal at 55 °C and pH 5.0 and remained 80.34 % and 71.36 % of the initial activity at 55 °C and pH 4.0 after 60 min, respectively. The enzyme possessed high activity in the presence of Co2+ , while Ag+ showed the strongest inhibition ability. The optimal substrate was 20 g/L dextran T-2000. The findings could facilitate the low-cost, large-scale production of food-grade DEX for use in the sugar industry.
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Affiliation(s)
- Jingyi Zhao
- College of Light Industry and Food Engineering, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, P. R. China
| | - Leyi Wang
- College of Light Industry and Food Engineering, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, P. R. China
| | - Xin Wei
- College of Light Industry and Food Engineering, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, P. R. China
| | - Kai Li
- College of Light Industry and Food Engineering, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, P. R. China.,Sugar Industry Collaborative Innovation Center, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, P. R. China
| | - Jidong Liu
- College of Light Industry and Food Engineering, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, P. R. China.,Sugar Industry Collaborative Innovation Center, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, P. R. China
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Zhan N, Wang T, Zhang L, Shan A. A eukaryotic expression strategy for producing the novel antimicrobial peptide PRW4. Braz J Microbiol 2020; 51:999-1008. [PMID: 32415637 DOI: 10.1007/s42770-020-00291-4] [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] [Received: 11/25/2019] [Accepted: 04/30/2020] [Indexed: 02/07/2023] Open
Abstract
The antimicrobial peptide PMAP-36 is a cationic peptide derived from porcine myeloid. The N-terminally paired lysine of PMAP-36 was substituted with tryptophan, and the C-terminal hydrophobic tail was deleted, thereby obtaining the antimicrobial peptide PRW4. PRW4 is a α-helical antimicrobial peptide with broad-spectrum antimicrobial activity. In this study, PRW4 was fused to the 6× His-Trx, and the fusion protein was successfully expressed in Pichia pastoris GS115 from the vector pPICZαA. The maximal induction of recombinant protein occurred in the presence of 1% methanol after 96 h at pH 6.0. After purification by a Ni-NTA resin column and digestion by enterokinase protease, 15 mg of recombinant PRW4 with a purity of 90% was obtained from 1 L of fermentation culture. The results indicated that recombinant PRW4 had similar antimicrobial activity as synthetic PRW4 against bacteria such as Escherichia coli ATCC 25922, Escherichia coli UB 1005, Salmonella typhimurium C7731, Salmonella typhimurium 7913, Salmonella typhimurium ATCC 14028, Staphylococcus aureus ATCC 29213, Staphylococcus epidermidis ATCC 12228, and Streptococcus faecalis ATCC 29212. We have successfully expressed PRW4 in P. pastoris, and this work provides a reference for the production of modified antimicrobial peptides in P. pastoris.
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Affiliation(s)
- Na Zhan
- Institute of Animal Nutrition, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin, China
| | - Tianyu Wang
- Institute of Animal Nutrition, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin, China
| | - Licong Zhang
- Institute of Animal Nutrition, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin, China
| | - Anshan Shan
- Institute of Animal Nutrition, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin, China.
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