量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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Rubrobacter belong to the phylum “Actinobacteria” while Deinococcus that are well known as the radioresistant bacteria belong to the distinct phylum “Deinococcus-Thermus”. To date, 11 species of Rubrobacter have been reported, and radiation resistance data are described for 3 species, namely Rubrobacter radiotolerans, Rubrobacter xylanophilus and Rubrobacter taiwanensis. The strain AA3-22 isolated from Arima Onsen is a moderate thermophile with an optimum growth temperature of 58 ˚C, and it has been reported from genome sequence analysis that it is most related to R. xylanophilus. In this study, we compared the survival curves of the strain AA3-22, the R. radiotolerans and R. xylanophilus type strains in order to clarify the resistance to gamma- and ultraviolet-rays. AA3-22 showed the lowest resistance to gamma-rays among the three strains tested. The survival curve of AA3-22 resembled that of the wild-type strain of Deinococcus radiodurans. The gamma-ray resistance of R. radiotolerans JCM 2153 was in good agreement with the previous literature value. On the other hand, the gamma-ray resistance of R. xylanophilus JCM 11954 was lower than the previous literature value, which seemes to be due to the difference in cell density subjected to irradiation. Regarding ultraviolet resistance, AA3-22 exhibited the highest resistance among the three strains tested, and R. xylanophilus JCM 1195 unexpectedly showed significant sensitivity to ultraviolet-rays
Resistance to gamma- and ultraviolet-rays of Rubrobacter sp. AA3-22
