title: Class II DNA photolyase from Arabidopsis thaliana contains FAD as a cofactor.
abstract: The major UV-B photoproduct in DNA is the cyclobutane pyrimidine dimer (CPD). CPD-photolyases repair this DNA damage by a light-driven electron transfer. The chromophores of the class II CPD-photolyase from Arabidopsis thaliana, which was cloned recently [Taylor, R., Tobin, A. & Bray, C. (1996) Plant Physiol. 112, 862; Ahmad, M., Jarillo, J.A., Klimczak, L.J., Landry, L.G., Peng, T., Last, R.L. & Cashmore, A.R. (1997) Plant Cell 9, 199-207], have not been characterized so far. Here we report on the overexpression of the Arabidopsis CPD photolyase in Escherichia coli as a 6 x His-tag fusion protein, its purification and the analysis of the chromophore composition and enzymatic activity. Like class I photolyase, the Arabidopsis enzyme contains FAD but a second chromophore was not detectable. Despite the lack of a second chromophore the purified enzyme has photoreactivating activity.
authors.affiliation: FB Biologie/Botanik, Philipps-Universität Marburg, Germany.
authors.forename: O
authors.initials: O
authors.lastname: Kleiner
authors.forename: J
authors.initials: J
authors.lastname: Butenandt
authors.forename: T
authors.initials: T
authors.lastname: Carell
authors.forename: A
authors.initials: A
authors.lastname: Batschauer
mesh_terms: D017360:Arabidopsis / Q000201:enzymology*; D001483:Base Sequence; D017931:DNA Primers; D004260:DNA Repair; D004255:Deoxyribodipyrimidine Photo-Lyase / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D004789:Enzyme Activation; D005182:Flavin-Adenine Dinucleotide / Q000378:metabolism*; D008027:Light; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D017931:DNA Primers; D011994:Recombinant Proteins; D005182:Flavin-Adenine Dinucleotide; D004255:Deoxyribodipyrimidine Photo-Lyase