Open AccessIdentification of novel genes regulated by the oxidative stress‐responsive transcriptional activator SdrP in Thermus thermophilus HB8
Author(s) -
Agari Yoshihiro,
Kuramitsu Seiki,
Shinkai Akeo
Publication year - 2010
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.2010.02133.x
Subject(s) - thermus thermophilus , gene , biology , gene expression , activator (genetics) , superoxide dismutase , regulation of gene expression , oxidative stress , microbiology and biotechnology , biochemistry , genetics , escherichia coli
The stationary phase‐dependent regulatory protein (SdrP) from the extremely thermophilic bacterium, Thermus thermophilus HB8, a CRP/FNR family protein, is a transcription activator, whose expression increases in the stationary phase of growth. SdrP positively regulates the expression of several genes involved in nutrient and energy supply, redox control, and nucleic acid metabolism. We found that sdrP mRNA showed an increased response to various environmental or chemical stresses in the logarithmic growth phase, the most effective stress being oxidative stress. From genome‐wide expression pattern analysis using 306 DNA microarray datasets from 117 experimental conditions, eight new SdrP‐regulated genes were identified among the genes whose expression was highly correlated with that of sdrP . The gene products included manganese superoxide dismutase, catalase, and excinuclease ABC subunit B (UvrB), which plays a central role in the nucleotide excision repair of damaged DNA. Expression of these genes also tended to increase upon entry into stationary phase, as in the case of the previously identified SdrP‐regulated genes. These results indicate that the main function of SdrP is in the oxidative stress response.