1887

Abstract

The genome of the facultatively photosynthetic bacterium encodes three proteins of the photolyase/cryptochrome family. This paper shows that (RSP2143) encodes a functional photolyase, which is an enzyme that repairs UV radiation-induced DNA damage in a blue light dependent manner. Expression of is upregulated in response to light, with no photoreceptor or the photosynthetic electron transport being involved. The results reveal that singlet oxygen and hydrogen peroxide dependent signals are transmitted by the factor and the anti- factor ChrR affecting expression, while superoxide anions do not stimulate expression. Thus, the regulon is involved not only in the response to singlet oxygen but also in the hydrogen peroxide response.

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2007-06-01
2019-11-13
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