Superoxide Dismutase and Pseudocatalase Increase Tolerance to Hg(II) in Thermus thermophilus HB27 by Maintaining the Reduced Bacillithiol Pool

Author:

Norambuena Javiera1,Hanson Thomas E.234ORCID,Barkay Tamar1,Boyd Jeffrey M.1ORCID

Affiliation:

1. Department of Biochemistry and Microbiology, Rutgers, the State University of New Jersey, New Brunswick, New Jersey, USA

2. School of Marine Science and Policy, University of Delaware, Newark, Delaware, USA

3. Delaware Biotechnology Institute, Newark, Delaware, USA

4. Department of Biological Sciences, University of Delaware, Newark, Delaware, USA

Abstract

Thermus thermophilus is a deep-branching thermophilic aerobe. It is a member of the Deinococcus - Thermus phylum that, together with the Aquificae , constitute the earliest branching aerobic bacterial lineages; therefore, this organism serves as a model for early diverged bacteria (R. K. Hartmann, J. Wolters, B. Kröger, S. Schultze, et al., Syst Appl Microbiol 11:243–249, 1989, https://doi.org/10.1016/S0723-2020(89)80020-7 ) whose natural heated habitat may contain mercury of geological origins (G. G. Geesey, T. Barkay, and S. King, Sci Total Environ 569-570:321–331, 2016, https://doi.org/10.1016/j.scitotenv.2016.06.080 ). T. thermophilus likely arose shortly after the oxidation of the biosphere 2.4 billion years ago. Studying T. thermophilus physiology provides clues about the origin and evolution of mechanisms for mercury and oxidative stress responses, the latter being critical for the survival and function of all extant aerobes.

Funder

National Science Foundation

Publisher

American Society for Microbiology

Subject

Virology,Microbiology

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