1887

Abstract

Whole genome sequencing of the response of W83 to hydrogen peroxide revealed an upregulation of several uncharacterized, novel genes. Under conditions of prolonged oxidative stress in , increased expression of a unique transcriptional unit carrying the , and three other hypothetical genes (, and ) was observed. The transcriptional start site of this operon appears to be located 91 bp upstream of the translational start, with a potential − 10 region at − 3 nt and a − 35 region at − 39 nt. Isogenic mutants FLL273 (PG1777 : : -) and FLL293 (PG1779 : : -) showed increased sensitivity to and decreased survival after treatment with hydrogen peroxide. FLL273 showed a fivefold increase in the formation of spontaneous mutants when compared with the parent strain after exposure to hydrogen peroxide. The recombinant PG1777 protein displayed iron-binding properties when incubated with FeSO and Fe(NH)(SO).6HO. The rPG1777 protein protected DNA from degradation when exposed to hydrogen peroxide in the presence of iron. Taken together, the data suggest that the transcriptional unit may play an important role in oxidative stress resistance in via its ability to protect against DNA damage.

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2016-02-01
2021-07-30
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