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Hua, Y.*; Narumi, Issei; Gao, G.*; Tian, B.*; Sato, Katsuya; Kitayama, Shigeru; Shen, B.*
Biochemical and Biophysical Research Communications, 306(2), p.354 - 360, 2003/06
Times Cited Count:152 Percentile:95.76(Biochemistry & Molecular Biology)We have identified a unique deinococcal gene, , as a general switch for downstream DNA repair and protection pathways, from a natural mutant, in which is disrupted by a transposon. Complete functional disruption of the gene in wild-type leads to dramatic sensitivity to ionizing radiation. Radioresistance of the disruptant could be fully restored by complementation with . In response to radiation stress, PprI can significantly and specifically induce the gene expression of and and enhance the enzyme activities of catalases. These results strongly suggest that PprI plays a crucial role in regulating multiple DNA repair and protection pathways in response to radiation stress.
Narumi, Issei; Sato, Katsuya; Kikuchi, Masahiro; Funayama, Tomoo; Yanagisawa, Tadashi*; Kobayashi, Yasuhiko; Watanabe, Hiroshi; Yamamoto, Kazuo
Journal of Bacteriology, 183(23), p.6951 - 6956, 2001/12
Times Cited Count:91 Percentile:83.71(Microbiology)The involvement of LexA in induction of RecA was investigated in . As in the wild-type strain, an increase in RecA protein synthesis following irradiation was detected in a disruptant, indicating that LexA is not involved in the induction of RecA in .