title: A controllable bacterial lysis system to enhance biological safety of live attenuated Vibrio anguillarum vaccine.
abstract: Bacterial strains used as backbone for the generation of vaccine prototypes should exhibit an adequate and stable safety profile. Given the fact that live attenuated vaccines often contain some potential risks in virulence recovery and spread infections, new approaches are greatly needed to improve their biological safety. Here, a critically iron-regulated promoter PviuA was screened from Vibrio anguillarum, which was demonstrated to respond to iron-limitation signal both in vitro and in vivo. By using PviuA as a regulatory switch to control the expression of phage P22 lysis cassette 13-19-15, a novel in vivo inducible bacterial lysis system was established in V. anguillarum. This system was proved to be activated by iron-limitation signals and then effectively lyse V. anguillarum both in vitro and in vivo. Further, this controllable bacterial lysis system, after being transformed into a live attenuated V. anguillarum vaccine strain MVAV6203, was confirmed to significantly improve biological safety of the live attenuated vaccine without impairing its immune protection efficacy.
authors.affiliation: State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Teng
authors.initials: T
authors.lastname: Chu
authors.affiliation: State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Lingyu
authors.initials: L
authors.lastname: Guan
authors.affiliation: State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Pengfei
authors.initials: P
authors.lastname: Shang
authors.affiliation: State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Qiyao
authors.initials: Q
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Jingfan
authors.initials: J
authors.lastname: Xiao
authors.affiliation: State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China; Shanghai Collaborative Innovation Center for Biomanufacturing Technology, Shanghai 200237, China. Electronic address: qinliu@ecust.edu.cn.
authors.forename: Qin
authors.initials: Q
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China; Shanghai Collaborative Innovation Center for Biomanufacturing Technology, Shanghai 200237, China.
authors.forename: Yuanxing
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000818:Animals; D001428:Bacterial Vaccines / Q000008:administration & dosage / Q000009:adverse effects*; D017100:Bacteriophage P22 / Q000378:metabolism*; D005393:Fish Diseases / Q000276:immunology / Q000382:microbiology / Q000517:prevention & control*; D007501:Iron / Q000378:metabolism; D014613:Vaccines, Attenuated / Q000008:administration & dosage / Q000009:adverse effects; D014733:Vibrio / Q000276:immunology*; D014735:Vibrio Infections / Q000276:immunology / Q000382:microbiology / Q000517:prevention & control / Q000821:virology*; D015027:Zebrafish
chemical_list: D001428:Bacterial Vaccines; D014613:Vaccines, Attenuated; D007501:Iron
keywords: In vivo lysis; Iron-regulation; Live bacterial vaccine; Vibrio anguillarum