Abstract
The luminescent bacterium Escherichia coli AB1886 uvrA6 (pLeo1) carries a plasmid with the luxCDABE genes of the marine bacterium Photobacterium leiognathi; its UV resistance is approximately twice as high as the UV resistance of nonluminous E. coli AB1886 uvrA6. The phr::kanr mutations (a defect in photolyase functional activity) that were introduced in the E. coli AB1886 uvrA6 (pLeo1) genome completely abolished the high UV resistance, indicating that the bacterial photolyase that is responsible for photoreactivation made a major contribution to bioluminescence-induced DNA repair. The photoreactivating activity of P. leiognathi bioluminescence was approximately 2.5 times lower than that induced by a light source with λ > 385 nm. When E. coli cells with a plasmid containing luxCDABE under the control of RecA-LexA-regulated promoters were exposed to UV light, the UV-induced bioluminescence intensity did not increase until 25–30 min after the exposure, nor did it contribute to DNA repair. The quorum-sensing regulatory system was not involved in DNA repair mediated by photolyase.
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Abbreviations
- ROS:
-
reactive oxygen species
- UV:
-
ultraviolet
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Original Russian Text © G.B. Zavilgelsky, O.E. Melkina, V.Yu. Kotova, M.N. Konopleva, I.V. Manukhov, K.S. Pustovoit, 2015, published in Biofizika, 2015, Vol. 60, No. 5, pp. 898–905.
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Zavilgelsky, G.B., Melkina, O.E., Kotova, V.Y. et al. Photoreactivating activity of bioluminescence: Repair of UV-Damaged Escherichia coli DNA proceeds with assistance of the lux genes of marine bacteria. BIOPHYSICS 60, 739–744 (2015). https://doi.org/10.1134/S0006350915050243
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DOI: https://doi.org/10.1134/S0006350915050243