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Front Microbiol. 2017 Sep 13;8:1766. doi: 10.3389/fmicb.2017.01766. eCollection 2017.

Targeting Inhibition of SmpB by Peptide Aptamer Attenuates the Virulence to Protect Zebrafish against Aeromonas veronii Infection.

Author information

1
Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Biological Sciences, Hainan UniversityHaikou, China.
2
Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural SciencesHaikou, China.
3
Department of Biology, College of Science, Shantou UniversityShantou, China.
4
Department of Biotechnology, College of Life Sciences, Sichuan UniversityChengdu, China.

Abstract

Aeromonas veronii is an important pathogen of aquatic animals, wherein Small protein B (SmpB) is required for pathogenesis by functioning as both a component in stalled-ribosome rescue and a transcription factor in upregulation of virulence gene bvgS expression. Here a specific peptide aptamer PA-1 was selected from peptide aptamer library by bacterial two-hybrid system employing pBT-SmpB as bait. The binding affinity between SmpB and PA-1 was evaluated using enzyme-linked immunosorbent assay. The key amino acids of SmpB that interact with PA-1 were identified. After PA-1 was introduced into A. veronii, the engineered strain designated as A. veronii (pN-PA-1) was more sensitive and grew slower under salt stress in comparison with wild type, as the disruption of SmpB by PA-1 resulted in significant transcription reductions of virulence-related genes. Consistent with these observations, A. veronii (pN-PA-1) was severely attenuated in model organism zebrafish, and vaccination of zebrafish with A. veronii (pN-PA-1) induced a strong antibody response. The vaccinated zebrafish were well protected against subsequent lethal challenges with virulent parental strain. Collectively, we propose that targeting inhibition of SmpB by peptide aptamer PA-1 possesses the desired qualities for a live attenuated vaccine against pathogenic A. veronii.

KEYWORDS:

Aeromonas veronii; SmpB; bacterial two-hybrid system; live attenuated vaccines; selection of peptide aptamers library

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