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Wang S, Jiang Y, Zhang W, Wei Y, Xiao X, Wei Z, Wen X, Dong Y, Jian J, Wang N, Pang H. The Effect of the Lysine Acetylation Modification of ClpP on the Virulence of Vibrio alginolyticus. Molecules 2024; 29:4278. [PMID: 39275125 PMCID: PMC11396845 DOI: 10.3390/molecules29174278] [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: 07/10/2024] [Revised: 09/06/2024] [Accepted: 09/07/2024] [Indexed: 09/16/2024] Open
Abstract
Acetylation modification has become one of the most popular topics in protein post-translational modification (PTM) research and plays an important role in bacterial virulence. A previous study indicated that the virulence-associated caseinolytic protease proteolytic subunit (ClpP) is acetylated at the K165 site in Vibrio alginolyticus strain HY9901, but its regulation regarding the virulence of V. alginolyticus is still unknown. We further confirmed that ClpP undergoes lysine acetylation (Kace) modification by immunoprecipitation and Western blot analysis and constructed the complementation strain (C-clpP) and site-directed mutagenesis strains including K165Q and K165R. The K165R strain significantly increased biofilm formation at 36 h of incubation, and K165Q significantly decreased biofilm formation at 24 h of incubation. However, the acetylation modification of ClpP did not affect the extracellular protease (ECPase) activity. In addition, we found that the virulence of K165Q was significantly reduced in zebrafish by in vivo injection. To further study the effect of lysine acetylation on the pathogenicity of V. alginolyticus, GS cells were infected with four strains, namely HY9901, C-clpP, K165Q and K165R. This indicated that the effect of the K165Q strain on cytotoxicity was significantly reduced compared with the wild-type strain, while K165R showed similar levels to the wild-type strain. In summary, the results of this study indicate that the Kace of ClpP is involved in the regulation of the virulence of V. alginolyticus.
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Affiliation(s)
- Shi Wang
- Fisheries College, Guangdong Ocean University, Zhanjiang 524025, China
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang 524025, China
| | - Yingying Jiang
- Fisheries College, Guangdong Ocean University, Zhanjiang 524025, China
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang 524025, China
| | - Weijie Zhang
- Fisheries College, Guangdong Ocean University, Zhanjiang 524025, China
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang 524025, China
| | - Yingzhu Wei
- Fisheries College, Guangdong Ocean University, Zhanjiang 524025, China
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang 524025, China
| | - Xing Xiao
- Fisheries College, Guangdong Ocean University, Zhanjiang 524025, China
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang 524025, China
| | - Zhiqing Wei
- Fisheries College, Guangdong Ocean University, Zhanjiang 524025, China
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang 524025, China
| | - Xiaoxin Wen
- Fisheries College, Guangdong Ocean University, Zhanjiang 524025, China
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang 524025, China
| | - Yuhang Dong
- Fisheries College, Guangdong Ocean University, Zhanjiang 524025, China
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang 524025, China
| | - Jichang Jian
- Fisheries College, Guangdong Ocean University, Zhanjiang 524025, China
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang 524025, China
| | - Na Wang
- Chinese Academy of Inspection and Quarantine, Beijing 100176, China
| | - Huanying Pang
- Fisheries College, Guangdong Ocean University, Zhanjiang 524025, China
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang 524025, China
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Prokaryotic Expression of α-13 Giardin Gene and Its Intracellular Localization in Giardia lamblia. BIOMED RESEARCH INTERNATIONAL 2017; 2017:1603264. [PMID: 28286754 PMCID: PMC5329650 DOI: 10.1155/2017/1603264] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 01/18/2017] [Indexed: 12/02/2022]
Abstract
To study prokaryotic expression and subcellular localization of α-13 giardin in Giardia lamblia trophozoites, α-13 giardin gene was amplified and cloned into prokaryotic expression vector pET-28a(+). The positive recombinant plasmid was transformed into E. coli BL21(DE3) for expression by using IPTG and autoinduction expression system (ZYM-5052). The target protein was validated by SDS-PAGE and Western blotting and purified by Ni-NTA Resin. Rabbits were immunized with purified fusion proteins for preparation of polyclonal antibody; then the intracellular location of α-13 giardin was determined by fluorescence immunoassay. The results showed that the length of α-13 giardin gene was 1038 bp, encoding a polypeptide of 345 amino acids. The expressed product was a fusion protein with about 40 kDa largely present in soluble form. The target protein accounted for 21.0% of total proteins after being induced with IPTG, while it accounted for 28.8% with ZYM-5052. The anti-α13-giardin polyclonal antibody possessed good antigenic specificity as well as excellent binding activity with recombinant α-13 giardin. Immunofluorescence assays revealed that α-13 giardin was localized in the cytoplasm of G. lamblia trophozoite, suggesting that it is a cytoplasm-associated protein. The present study may lay a foundation for further functional research on α-13 giardin of G. lamblia.
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Wu S, Pan W, Shi X, Abdullahi AY, Wang Z, Yu X, Jiang B, Li K, Xu C, Li G. Immunolocalization of α18- and α12-giardin in Giardia lamblia trophozoites. Parasitol Res 2016; 115:4183-4187. [PMID: 27465564 DOI: 10.1007/s00436-016-5194-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Accepted: 07/06/2016] [Indexed: 10/21/2022]
Abstract
To study subcellular localization of α18- and α12-giardin in Giardia lamblia trophozoites, the α18- and α12-giardin genes were amplified from G. lamblia assemblage A, respectively. The PCR products were cloned into the prokaryotic expression vector pET-28a(+), and the positive recombinant plasmids were transformed into E. coli Rosetta (DE3) strain for the expression, and expressed α18- and α12-giardin fusion protein were purified by Ni-Agarose resin, respectively. Mice were immunized with purified fusion proteins for preparation of polyclonal antibody, and then the subcellular localization of α18- and α12-giardin was determined by fluorescence immunoassay. Results showed that the concentrations of purified α18- and α12-giardin fusion proteins were 1.20 and 0.86 mg/ml, respectively. The titers of anti-α18- and anti-α12-giardin polyclonal antibody were both as high as 1:25600 dilutions. Immunofluorescent analysis showed that α18- and α12-giardin proteins were mainly localized at four pairs of flagella and the cytoplasm of G. lamblia trophozoites, suggesting that α18- and α12-giardin are the flagella and cytoplasm-associated proteins, respectively. The above information would lay the foundation for research about the crystal structure and biological function of α18- and α12-giardin.
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Affiliation(s)
- Sheng Wu
- Guangdong Provincial Zoonosis Prevention and Control Key Laboratory, College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642, People's Republic of China
| | - Weida Pan
- Guangdong Provincial Zoonosis Prevention and Control Key Laboratory, College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642, People's Republic of China
| | - Xianli Shi
- Guangdong Provincial Zoonosis Prevention and Control Key Laboratory, College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642, People's Republic of China
| | - Auwalu Yusuf Abdullahi
- Guangdong Provincial Zoonosis Prevention and Control Key Laboratory, College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642, People's Republic of China
| | - Zhen Wang
- Guangdong Provincial Zoonosis Prevention and Control Key Laboratory, College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642, People's Republic of China
| | - Xingang Yu
- Guangdong Provincial Zoonosis Prevention and Control Key Laboratory, College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642, People's Republic of China
| | - Biao Jiang
- Guangdong Provincial Zoonosis Prevention and Control Key Laboratory, College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642, People's Republic of China
| | - Kangxin Li
- Guangdong Provincial Zoonosis Prevention and Control Key Laboratory, College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642, People's Republic of China
| | - Chang Xu
- Guangdong Provincial Zoonosis Prevention and Control Key Laboratory, College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642, People's Republic of China
| | - Guoqing Li
- Guangdong Provincial Zoonosis Prevention and Control Key Laboratory, College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642, People's Republic of China.
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