학술논문
Variable resistance to zinc intoxication among Streptococcus agalactiae reveals a novel IS 1381 insertion element within the zinc efflux transporter gene czcD .
Document Type
Academic Journal
Author
Varghese BR; School of Pharmacy and Medical Sciences, Menzies Health Institute Queensland, Griffith University, Gold Coast, QLD, Australia.; Goh KGK; School of Pharmacy and Medical Sciences, Menzies Health Institute Queensland, Griffith University, Gold Coast, QLD, Australia.; Desai D; School of Pharmacy and Medical Sciences, Menzies Health Institute Queensland, Griffith University, Gold Coast, QLD, Australia.; Acharya D; School of Pharmacy and Medical Sciences, Menzies Health Institute Queensland, Griffith University, Gold Coast, QLD, Australia.; Chee C; School of Pharmacy and Medical Sciences, Menzies Health Institute Queensland, Griffith University, Gold Coast, QLD, Australia.; Sullivan MJ; School of Pharmacy and Medical Sciences, Menzies Health Institute Queensland, Griffith University, Gold Coast, QLD, Australia.; Ulett GC; School of Pharmacy and Medical Sciences, Menzies Health Institute Queensland, Griffith University, Gold Coast, QLD, Australia.; Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States.
Source
Publisher: Frontiers Research Foundation] Country of Publication: Switzerland NLM ID: 101560960 Publication Model: eCollection Cited Medium: Internet ISSN: 1664-3224 (Electronic) Linking ISSN: 16643224 NLM ISO Abbreviation: Front Immunol Subsets: MEDLINE
Subject
Language
English
Abstract
Streptococcus agalactiae , also known as group B Streptococcus, is an important human and animal pathogen. Zinc (Zn) is an essential trace element for normal bacterial physiology but intoxicates bacteria at high concentrations. Molecular systems for Zn detoxification exist in S. agalactiae , however the degree to which Zn detoxification may vary among different S. agalactiae isolates is not clear. We measured resistance to Zn intoxication in a diverse collection of clinical isolates of S. agalactiae by comparing the growth of the bacteria in defined conditions of Zn stress. We found significant differences in the ability of different S. agalactiae isolates to resist Zn intoxication; some strains such as S. agalactiae 18RS21 were able to survive and grow at 3.8-fold higher levels of Zn stress compared to other reference strains such as BM110 (6.4mM vs 1.68mM Zn as inhibitory, respectively). We performed in silico analysis of the available genomes of the S. agalactiae isolates used in this study to examine the sequence of czcD , which encodes an efflux protein for Zn that supports resistance in S. agalactiae . Interestingly, this revealed the presence of a mobile insertion sequence (IS) element, termed IS 1381, in the 5' region of czcD in S. agalactiae strain 834, which was hyper-resistant to Zn intoxication. Interrogating a wider collection of S. agalactiae genomes revealed identical placement of IS 1381 in czcD in other isolates from the clonal-complex-19 (CC19) 19 lineage. Collectively, these results show a resistance spectrum among S. agalactiae isolates enables survival in varying degrees of Zn stress, and this phenotypic variability has implications for understanding bacterial survival in metal stress.
Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
(Copyright © 2023 Varghese, Goh, Desai, Acharya, Chee, Sullivan and Ulett.)
Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
(Copyright © 2023 Varghese, Goh, Desai, Acharya, Chee, Sullivan and Ulett.)