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Divalent Cations Increase DNA Repair Activities of Bacterial (6‐4) Photolyases
Author(s) -
Ma Hongju,
Zhang Fan,
Ignatz Elisabeth,
Suehnel Martin,
Xue Peng,
Scheerer Patrick,
Essen Lars Oliver,
Krauß Norbert,
Lamparter Tilman
Publication year - 2017
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.12698
Subject(s) - photolyase , divalent , cryptochrome , dna , biochemistry , dna repair , chemistry , context (archaeology) , biology , gene , paleontology , circadian clock , organic chemistry
The (6‐4) photolyases of the FeS‐ BCP group can be considered as the most ancient type among the large family of cryptochrome and photolyase flavoproteins. In contrast to other photolyases, they contain an Fe‐S cluster of unknown function, a DMRL chromophore, an interdomain loop, which could interact with DNA , and a long C‐terminal extension. We compared DNA repair and photoreduction of two members of the FeS‐ BCP family, Agrobacterium fabrum PhrB and Rhodobacter sphaeroides RsCryB, with a eukaryotic (6‐4) photolyase from Ostreococcus , Os CPF , and a member of the class III CPD photolyases, PhrA from A. fabrum . We found that the low DNA repair effectivity of FeS‐ BCP proteins is largely stimulated by Mg 2+ and other divalent cations, whereas no effect of divalent cations was observed in Os CPF and PhrA. The (6‐4) repair activity in the presence of Mg 2+ is comparable with the repair activities of the other two photolyases. The photoreduction, on the other hand, is negatively affected by Mg 2+ in PhrB, but stimulated by Mg 2+ in PhrA. A clear relationship of Mg 2+ dependency on DNA repair with the evolutionary position conflicts with Mg 2+ dependency of photoreduction. We discuss the Mg 2+ effect in the context of structural data and DNA binding.