Affinity of yeast nucleotide excision repair factor 2, consisting of the Rad4 and Rad23 proteins, for ultraviolet damaged DNA.
Saccharomyces cerevisiae Rad4 and Rad23 proteins are required for the nucleotide excision repair of UV light-damaged DNA. Previous studies have indicated that these two DNA repair proteins are associated in a tight complex, which we refer to as nucleotide excision repair factor 2 (NEF2). In a reconstituted nucleotide excision repair reaction, incision of UV-damaged DNA is dependent on NEF2, indicating a role of NEF2 in an early step of the repair process. NEF2 does not, however, possess an enzymatic activity, and its function in the damage-specific incision reaction has not yet been defined. Here we use a DNA mobility shift assay to demonstrate that NEF2 binds specifically to UV-damaged DNA. Elimination of cyclobutane pyrimidine dimers from the UV-damaged DNA by enzymatic photoreactivation has little effect on the affinity of NEF2 for the DNA, suggesting that NEF2 recognizes the 6-(1, 2)-dihydro-2-oxo-4-pyrimidinyl)-5-methyl-2,4-(1H,3H)-pyrimidinedione photoproducts in the damaged DNA. These results highlight the intricacy of the DNA damage-demarcation reaction during nucleotide excision repair in eukaryotes.
Guzder
S N
SN
Sealy Center for Molecular Science, University of Texas Medical Branch, Galveston, Texas 77555-1061, USA.
Sung
P
P
Prakash
L
L
Prakash
S
S
D002474:Cell-Free System; D004247:DNA / Q000378:metabolism / Q000528:radiation effects*; D004249:DNA Damage; D004260:DNA Repair; D004268:DNA-Binding Proteins / Q000378:metabolism*; D005656:Fungal Proteins / Q000378:metabolism*; D011485:Protein Binding; D011740:Pyrimidine Dimers / Q000378:metabolism; D012441:Saccharomyces cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D029702:Schizosaccharomyces pombe Proteins; D011503:Transglutaminases; D014466:Ultraviolet Rays
D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D011740:Pyrimidine Dimers; C490846:RAD23 protein, S cerevisiae; C082463:RAD4 protein, S pombe; C490845:RHP23 protein, S pombe; D029701:Saccharomyces cerevisiae Proteins; D029702:Schizosaccharomyces pombe Proteins; C058406:pyrimidine-pyrimidone dimer; D004247:DNA; D011503:Transglutaminases