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Nucleic Acids Res
1997 Feb 15;254:764-8. doi: 10.1093/nar/25.4.764.
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Flavin adenine dinucleotide as a chromophore of the Xenopus (6-4)photolyase.
Todo T
,
Kim ST
,
Hitomi K
,
Otoshi E
,
Inui T
,
Morioka H
,
Kobayashi H
,
Ohtsuka E
,
Toh H
,
Ikenaga M
.
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Two types of enzyme utilizing light from the blue and near-UV spectral range (320-520 nm) are known to have related primary structures: DNA photolyase, which repairs UV-induced DNA damage in a light-dependent manner, and the blue light photoreceptor of plants, which mediates light-dependent regulation of seedling development. Cyclobutane pyrimidine dimers (CPDs) and pyrimidine (6-4) pyrimidone photoproducts [(6-4)photoproducts] are the two major photoproducts produced in DNA by UV irradiation. Two types of photolyases have been identified, one specific for CPDs (CPD photolyase) and another specific for (6-4)photoproducts [(6-4)photolyase]. (6-4)Photolyase activity was first found in Drosophila melanogaster and to date this gene has been cloned only from this organism. The deduced amino acid sequence of the cloned gene shows that (6-4)photolyase is a member of the CPD photolyase/blue light photoreceptor family. Both CPD photolyase and blue light photoreceptor are flavoproteins and bound flavin adenine dinucleotides (FADs) are essential for their catalytic activity. Here we report isolation of a Xenopus laevis(6-4)photolyase gene and show that the (6-4)photolyase binds non- covalently to stoichiometric amounts of FAD. This is the first indication of FAD as the chromophore of (6-4)photolyase.
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