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Journal Article
- Regulator of ribonuclease activity modulates the pathogenicity of Vibrio vulnificus
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Jaejin Lee , Eunkyoung Shin , Jaeyeong Park , Minho Lee , Kangseok Lee
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J. Microbiol. 2021;59(12):1133-1141. Published online November 9, 2021
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DOI: https://doi.org/10.1007/s12275-021-1518-5
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Abstract
- RraA, a protein regulator of RNase E activity, plays a unique
role in modulating the mRNA abundance in Escherichia coli.
The marine pathogenic bacterium Vibrio vulnificus also possesses
homologs of RNase E (VvRNase E) and RraA (VvRraA1
and VvRraA2). However, their physiological roles have not
yet been investigated. In this study, we demonstrated that
VvRraA1 expression levels affect the pathogenicity of V. vulnificus.
Compared to the wild-type strain, the VvrraA1-deleted
strain (ΔVvrraA1) showed decreased motility, invasiveness,
biofilm formation ability as well as virulence in mice; these
phenotypic changes of ΔVvrraA1 were restored by the exogenous
expression of VvrraA1. Transcriptomic analysis indicated
that VvRraA1 expression levels affect the abundance
of a large number of mRNA species. Among them, the halflives
of mRNA species encoding virulence factors (e.g., smcR
and htpG) that have been previously shown to affect VvrraA1
expression-dependent phenotypes were positively correlated
with VvrraA1 expression levels. These findings suggest that
VvRraA1 modulates the pathogenicity of V. vulnificus by regulating
the abundance of a subset of mRNA species.
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