著者

RITSUKO KUWANA RYUJI YAMAZAWA RYOKO ASADA KIYOSHI ITO MASAKAZU FURUTA HIROMU TAKAMATSU

出版者

The Society for Antibacterial and Antifungal Agents, Japan

雑誌

Journal of Microorganism Control (ISSN:27586383)

巻号頁・発行日

vol.28, no.1, pp.15-25, 2023 (Released:2023-05-08)

参考文献数

45

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Abstract: Ultraviolet (UV) -C is widely used to kill bacteria as it damages chromosomal DNA. We analyzed the denaturation of the protein function of Bacillus subtilis spores after UV-C irradiation. Almost all of the B. subtilis spores germinated in Luria-Bertani (LB) liquid medium, but the colony-forming unit (CFU) of the spores on LB agar plates decreased to approximately 1/103 by 100 mJ/cm2 of UV-C irradiation. Some of the spores germinated in LB liquid medium under phase-contrast microscopy, but almost no colonies formed on the LB agar plates after 1 J/cm2 of UV-C irradiation. The fluorescence of the green fluorescent protein (GFP) -fused spore proteins, YeeK-GFP, YeeK is a coat protein, decreased following UV-C irradiation of over 1 J/cm2, while that of SspA-GFP, SspA is a core protein, decreased following UV-C irradiation of over 2 J/ cm2, respectively. These results revealed that UV-C affected on coat proteins more than core proteins. We conclude that 25 to 100 mJ/cm2 of UV-C irradiation can cause DNA damage, and more than 1 J/cm2 of UV-C irradiation can cause the denaturation of spore proteins involved in germination. Our study would contribute to improve the technology to detect the bacterial spores, especially after UV sterilization.