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Wu S, Sheng L, Kou G, Tian R, Ye Y, Wang W, Sun J, Ji J, Shao J, Zhang Y, Sun X. Double phage displayed peptides co-targeting-based biosensor with signal enhancement activity for colorimetric detection of Staphylococcus aureus. Biosens Bioelectron 2024; 249:116005. [PMID: 38199079 DOI: 10.1016/j.bios.2024.116005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 12/21/2023] [Accepted: 01/04/2024] [Indexed: 01/12/2024]
Abstract
The development of simple, fast, sensitive, and specific strategies for the detection of foodborne pathogenic bacteria is crucial for ensuring food safety and promoting human health. Currently, detection methods for Staphylococcus aureus still suffer from issues such as low specificity and low sensitivity. To address this problem, we proposed a sensitivity enhancement strategy based on double phage-displayed peptides (PDPs) co-targeting. Firstly, we screened two PDPs and analyzed their binding mechanisms through fluorescent localization, pull-down assay, and molecular docking. The two PDPs target S. aureus by binding to specific proteins on its outer membrane. Based on this phenomenon, a convenient and sensitive double PDPs colorimetric biosensor was developed. Double thiol-modified phage-displayed peptides (PDP-SH) enhance the aggregation of gold nanoparticles (AuNPs), whereas the specific interaction between the double PDPs and bacteria inhibits the aggregation of AuNPs, resulting in an increased visible color change before and after the addition of bacteria. This one-step colorimetric approach displayed a high sensitivity of 2.35 CFU/mL and a wide detection range from 10-2 × 108 CFU/mL. The combination with smartphone-based image analysis improved the portability of this method. This strategy achieves the straightforward, highly sensitive and portable detection of pathogenic bacteria.
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Affiliation(s)
- Shang Wu
- School of Food Science and Technology, International Joint Laboratory on Food Safety, Synergetic Innovation Center of Food Safety and Quality Control, Jiangnan University, Wuxi, Jiangsu, 214122, China; Yixing Institute of Food and Biotechnology Co., Ltd, Yixing, 214200, China
| | - Lina Sheng
- School of Food Science and Technology, International Joint Laboratory on Food Safety, Synergetic Innovation Center of Food Safety and Quality Control, Jiangnan University, Wuxi, Jiangsu, 214122, China; Yixing Institute of Food and Biotechnology Co., Ltd, Yixing, 214200, China
| | - Guocheng Kou
- School of Food Science and Technology, International Joint Laboratory on Food Safety, Synergetic Innovation Center of Food Safety and Quality Control, Jiangnan University, Wuxi, Jiangsu, 214122, China; Yixing Institute of Food and Biotechnology Co., Ltd, Yixing, 214200, China
| | - Run Tian
- School of Food Science and Technology, International Joint Laboratory on Food Safety, Synergetic Innovation Center of Food Safety and Quality Control, Jiangnan University, Wuxi, Jiangsu, 214122, China; Yixing Institute of Food and Biotechnology Co., Ltd, Yixing, 214200, China
| | - Yongli Ye
- School of Food Science and Technology, International Joint Laboratory on Food Safety, Synergetic Innovation Center of Food Safety and Quality Control, Jiangnan University, Wuxi, Jiangsu, 214122, China; Yixing Institute of Food and Biotechnology Co., Ltd, Yixing, 214200, China
| | - Weiya Wang
- School of Food Science and Technology, International Joint Laboratory on Food Safety, Synergetic Innovation Center of Food Safety and Quality Control, Jiangnan University, Wuxi, Jiangsu, 214122, China; Yixing Institute of Food and Biotechnology Co., Ltd, Yixing, 214200, China
| | - Jiadi Sun
- School of Food Science and Technology, International Joint Laboratory on Food Safety, Synergetic Innovation Center of Food Safety and Quality Control, Jiangnan University, Wuxi, Jiangsu, 214122, China; Yixing Institute of Food and Biotechnology Co., Ltd, Yixing, 214200, China
| | - Jian Ji
- School of Food Science and Technology, International Joint Laboratory on Food Safety, Synergetic Innovation Center of Food Safety and Quality Control, Jiangnan University, Wuxi, Jiangsu, 214122, China; Yixing Institute of Food and Biotechnology Co., Ltd, Yixing, 214200, China
| | - Jingdong Shao
- Comprehensive Technology Center of Zhangjiagang Customs, Zhangjiagang, Jiangsu, 215600, China
| | - Yinzhi Zhang
- School of Food Science and Technology, International Joint Laboratory on Food Safety, Synergetic Innovation Center of Food Safety and Quality Control, Jiangnan University, Wuxi, Jiangsu, 214122, China; State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu, 214122, China
| | - Xiulan Sun
- School of Food Science and Technology, International Joint Laboratory on Food Safety, Synergetic Innovation Center of Food Safety and Quality Control, Jiangnan University, Wuxi, Jiangsu, 214122, China; Yixing Institute of Food and Biotechnology Co., Ltd, Yixing, 214200, China.
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Guo JY, Liu IJ, Lin HT, Wang MJ, Chang YL, Lin SC, Liao MY, Hsu WC, Lin YL, Liao JC, Wu HC. Identification of COVID-19 B-cell epitopes with phage-displayed peptide library. J Biomed Sci 2021; 28:43. [PMID: 34098950 PMCID: PMC8182997 DOI: 10.1186/s12929-021-00740-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 06/03/2021] [Indexed: 12/23/2022] Open
Abstract
Background Coronavirus disease 19 (COVID-19) first appeared in the city of Wuhan, in the Hubei province of China. Since its emergence, the COVID-19-causing virus, SARS-CoV-2, has been rapidly transmitted around the globe, overwhelming the medical care systems in many countries and leading to more than 3.3 million deaths. Identification of immunological epitopes on the virus would be highly useful for the development of diagnostic tools and vaccines that will be critical to limiting further spread of COVID-19. Methods To find disease-specific B-cell epitopes that correspond to or mimic natural epitopes, we used phage display technology to determine the targets of specific antibodies present in the sera of immune-responsive COVID-19 patients. Enzyme-linked immunosorbent assays were further applied to assess competitive antibody binding and serological detection. VaxiJen, BepiPred-2.0 and DiscoTope 2.0 were utilized for B-cell epitope prediction. PyMOL was used for protein structural analysis. Results 36 enriched peptides were identified by biopanning with antibodies from two COVID-19 patients; the peptides 4 motifs with consensus residues corresponding to two potential B-cell epitopes on SARS-CoV-2 viral proteins. The putative epitopes and hit peptides were then synthesized for validation by competitive antibody binding and serological detection. Conclusions The identified B-cell epitopes on SARS-CoV-2 may aid investigations into COVID-19 pathogenesis and facilitate the development of epitope-based serological diagnostics and vaccines.
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Affiliation(s)
- Jing-You Guo
- Institute of Biologic Chemistry, Academia Sinica, Taipei, Taiwan.,Institute of Cellular and Organismic Biology, Academia Sinica, No. 128, Academia Road, Section 2, Nangang, Taipei, 11529, Taiwan
| | - I-Ju Liu
- Institute of Cellular and Organismic Biology, Academia Sinica, No. 128, Academia Road, Section 2, Nangang, Taipei, 11529, Taiwan
| | - Hsiu-Ting Lin
- Institute of Cellular and Organismic Biology, Academia Sinica, No. 128, Academia Road, Section 2, Nangang, Taipei, 11529, Taiwan
| | - Mei-Jung Wang
- Institute of Cellular and Organismic Biology, Academia Sinica, No. 128, Academia Road, Section 2, Nangang, Taipei, 11529, Taiwan
| | - Yu-Ling Chang
- Institute of Cellular and Organismic Biology, Academia Sinica, No. 128, Academia Road, Section 2, Nangang, Taipei, 11529, Taiwan
| | - Shin-Chang Lin
- Institute of Cellular and Organismic Biology, Academia Sinica, No. 128, Academia Road, Section 2, Nangang, Taipei, 11529, Taiwan
| | - Mei-Ying Liao
- Institute of Cellular and Organismic Biology, Academia Sinica, No. 128, Academia Road, Section 2, Nangang, Taipei, 11529, Taiwan
| | - Wei-Chia Hsu
- Institute of Cellular and Organismic Biology, Academia Sinica, No. 128, Academia Road, Section 2, Nangang, Taipei, 11529, Taiwan
| | - Yi-Ling Lin
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - James C Liao
- Institute of Biologic Chemistry, Academia Sinica, Taipei, Taiwan
| | - Han-Chung Wu
- Institute of Cellular and Organismic Biology, Academia Sinica, No. 128, Academia Road, Section 2, Nangang, Taipei, 11529, Taiwan.
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