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DNA backbone sulfur-modification expands microbial growth range under multiple stresses by its antioxidation function

TitleDNA backbone sulfur-modification expands microbial growth range under multiple stresses by its antioxidation function
Publication TypeJournal Article
Year of Publication2017
AuthorsYang Y., Xu G.P, Liang J.D, He Y., Xiong L., Li H., Bartlett D., Deng Z.X, Wang Z.J, Xiao X.
JournalScientific Reports
Date Published2017/06
Type of ArticleArticle
ISBN Number2045-2322
Accession NumberWOS:000403318400070
Keywordsbactericidal antibiotics; clostridium-difficile; escherichia-coli; field gel-electrophoresis; hydrogen-peroxide; oxidative stress; phosphorothioation; s-modification; shewanella-piezotolerans wp3; streptomyces-lividans

DNA phosphorothioate (PT) modification is a sulfur modification on the backbone of DNA introduced by the proteins DndA-E. It has been detected within many bacteria isolates and metagenomic datasets, including human pathogens, and is considered to be widely distributed in nature. However, little is known about the physiological function of this modification, and thus its evolutionary significance and application potential remains largely a mystery. In this study, we focused on the advantages of DNA PT modification to bacterial cells coping with environmental stresses. We show that the mesophile Escherichia coli and the extremophile Shewanella piezotolerans both expanded their growth ranges following exposure to extreme temperature, salinity, pH, pressure, UV, X-ray and heavy metals as a result of DNA phophorothioation. The phophorothioated DNA reacted to both H2O2 and hydroxyl radicals in vivo, and protected genomic DNA as well as sensitive enzymes from intracellular oxidative damage. We further demonstrate that this process has evolved separate from its associated role in DNA restriction and modification. These findings provide a physiological role for a covalent modification widespread in nature and suggest possible applications in biotechnology and biomedicine.

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