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Li Y, Liu C, Sun Y, Wang R, Wu C, Zhao H, Zhang L, Song D, Gao Q. Construction of the flagellin F mutant of Vibrio parahaemolyticus and its toxic effects on silver pomfret (Pampus argenteus) cells. Int J Biol Macromol 2024; 259:129395. [PMID: 38218285 DOI: 10.1016/j.ijbiomac.2024.129395] [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: 11/20/2023] [Revised: 01/05/2024] [Accepted: 01/08/2024] [Indexed: 01/15/2024]
Abstract
Vibrio parahaemolyticus causes diseases in aquatic organisms, leading to substantial financial losses to the aquaculture industry; its flagellin F (flaF) protein triggers severe inflammation in host cells. To enhance the understanding of the function of flaF in V. parahaemolyticus infection, in this study, a flaF-deficient mutant was constructed by employing two-step homologous recombination. The flaF-deficient mutant induced a significantly lower toll-like receptor 5 (TLR5) expression and apoptosis in fish intestinal epithelial cells than the wild-type V. parahaemolyticus. Furthermore, fluorescence labelling and microscopy analysis of TLR5 showed that V. parahaemolyticus and its mutant strain significantly enhanced TLR5 expression. Additionally, the findings suggest that flaF deletion did not significantly affect the expression of myeloid differentiation factor 88 (MyD88) and interleukin-8 (IL-8) induced by V.parahaemolyticus. In summary, V. parahaemolyticus induced a TLR5-dependent inflammatory response and apoptosis through MyD88, which was observed to be influenced by flaF deletion. In this study, we obtained stable mutants of V. parahaemolyticus via target gene deletion-which is a rapid and effective approach-and compared the induction of inflammatory response and apoptosis by V. parahaemolyticus and its mutant strain, providing novel perspectives for functional gene research in V. parahaemolyticus.
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Affiliation(s)
- Yang Li
- College of Life Science, Huzhou University, Huzhou 313000, PR China
| | - Chao Liu
- Songjiang Hospital Affiliated to Shanghai Jiaotong University, School of Medicine, Shanghai 201699, PR China
| | - Yuechen Sun
- Haidian Foreign Language Academy, Beijing 100195, PR China
| | - Ruijun Wang
- College of Life Science, Huzhou University, Huzhou 313000, PR China
| | - Choufei Wu
- College of Life Science, Huzhou University, Huzhou 313000, PR China
| | - Hanqu Zhao
- College of Life Science, Huzhou University, Huzhou 313000, PR China
| | - Liqin Zhang
- College of Life Science, Huzhou University, Huzhou 313000, PR China
| | - Dawei Song
- College of Life Science, Huzhou University, Huzhou 313000, PR China.
| | - Quanxin Gao
- College of Life Science, Huzhou University, Huzhou 313000, PR China.
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Han F, Zhang X, Chen Y, Zhao H, Wu J, Yu Y, Wang Y. A Simple Allelic Exchange Method for Efficient Seamless Knockout of Up to 34-kbp-Long Gene Cassettes in Pseudomonas. Appl Biochem Biotechnol 2023:10.1007/s12010-023-04806-1. [PMID: 38103122 DOI: 10.1007/s12010-023-04806-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/09/2023] [Indexed: 12/17/2023]
Abstract
Gene knockout is a widely used technique for engineering bacterial genomes, investigating the roles of genes in metabolism, and conferring biological characteristics. Herein, we developed a rapid, efficient, and simple method for the knockout of long gene cassettes in Pseudomonas spp., based on a traditional allelic exchange strategy. The upstream and downstream sequences of the target gene cluster to be deleted were amplified using primers with 5'-end sequences identical to the multiple cloning sites of a suicide plasmid (mutant allele insert vector). The sequences were then fused with the linearized suicide plasmid in one step via seamless cloning. The resulting allelic exchange vector (recombinant plasmid) was introduced from the donor strain (Escherichia coli SM 10) into recipient cells (Pseudomonas putida, P. composti, and P. khazarica) via conjugation. Single-crossover merodiploids (integrates the vector into host chromosome by homologous recombination) were screened based on antibiotic resistance conferred by the plasmid, and double-crossover haploids (deleting the target gene clusters and inserted alien plasmid backbone) were selected using sucrose-mediated counterselection. Unlike other approaches, the method described herein introduces no selective marker genes into the genomes of the knockout mutants. Using our method, we successfully deleted polysaccharide-encoding gene clusters in P. putida, P. composti, and P. khazarica and generated four mutants with single-gene cassette deletions up to 18 kbp and one mutant with double-gene cassette deletion of approximately 34 kbp. Collectively, our results indicate that this method is ideal for the deletion of long genetic sequences, yielding seamless mutants of various Pseudomonas spp.
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Affiliation(s)
- Feng Han
- College of Food Science and Technology, Shanghai Ocean University, Shanghai, China
- Ministry of Agriculture and Rural Affairs, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai, China
| | - Xiaoya Zhang
- College of Food Science and Technology, Shanghai Ocean University, Shanghai, China
| | - Yunfei Chen
- College of Food Science and Technology, Shanghai Ocean University, Shanghai, China
| | - Haixia Zhao
- College of Food Science and Technology, Shanghai Ocean University, Shanghai, China
| | - Jieer Wu
- College of Food Science and Technology, Shanghai Ocean University, Shanghai, China
| | - Yongxin Yu
- College of Food Science and Technology, Shanghai Ocean University, Shanghai, China.
- Laboratory of Quality and Safety Risk Assessment for Aquatic Products on Storage and Preservation (Shanghai), Ministry of Agriculture and Rural Affairs, Shanghai, China.
| | - Yongjie Wang
- College of Food Science and Technology, Shanghai Ocean University, Shanghai, China.
- Laboratory of Quality and Safety Risk Assessment for Aquatic Products on Storage and Preservation (Shanghai), Ministry of Agriculture and Rural Affairs, Shanghai, China.
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong, China.
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