Variable resistance to zinc intoxication among Streptococcus agalactiae reveals a novel IS1381 insertion element within the zinc efflux transporter gene czcD

Varghese, Brian R., Goh, Kelvin G. K., Desai, Devika, Acharya, Dhruba, Chee, Collin, Sullivan, Matthew J. ORCID: https://orcid.org/0000-0003-2276-3132 and Ulett, Glen C. (2023) Variable resistance to zinc intoxication among Streptococcus agalactiae reveals a novel IS1381 insertion element within the zinc efflux transporter gene czcD. Frontiers in Immunology, 14. ISSN 1664-3224

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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 IS1381, 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 IS1381 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.

Item Type: Article
Additional Information: Funding Information: This study was supported with an Ideas Grant from the National Health and Medical Research Council (2021475) to MS, KG and GU.
Uncontrolled Keywords: czcd,metal ions,metallobiology,streptococcus agalactiae,zinc efflux,immunology and allergy,immunology ,/dk/atira/pure/subjectarea/asjc/2700/2723
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Depositing User: LivePure Connector
Date Deposited: 02 Dec 2023 03:35
Last Modified: 02 Dec 2023 03:35
URI: https://ueaeprints.uea.ac.uk/id/eprint/93857
DOI: 10.3389/fimmu.2023.1174695

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