Structure of UvrABC excinuclease-UV-damaged DNA complexes studied by flow linear dichroism. DNA curved by UvrB and UvrC.
The interaction between UvrABC excinuclease from Escherichia coli and ultraviolet light-(UV) damaged DNA was studied by flow linear dichroism. The dichroism signal from DNA was drastically decreased in intensity upon incubation with UvrA and UvrB or whole enzyme in the presence of effector ATP. The change was specific for UV-damaged DNA, and a concluded suppressed DNA orientation suggests the wrapping of DNA around the protein. The incubation with the UvrC subunit alone also somewhat reduces the signal, however, in this case the change was smaller and not specific for UV-damaged DNA. The structural modification of DNA, promoted by the (UvrA2-UvrB) complex, probably facilitates or stabilizes the interaction of the UvrC subunit with DNA for the excision.
Takahashi
M
M
Institut de Biologie Moléculaire et Cellulaire du CNRS, Strasbourg, France.
Bertrand-Burggraf
E
E
Fuchs
R P
RP
Nordén
B
B
D000251:Adenosine Triphosphatases / Q000378:metabolism; D001426:Bacterial Proteins / Q000378:metabolism; D017123:Bacteriophage T7 / Q000737:chemistry; D004249:DNA Damage; D004265:DNA Helicases; D004260:DNA Repair / Q000502:physiology*; D004279:DNA, Viral / Q000378:metabolism / Q000528:radiation effects*; D004268:DNA-Binding Proteins / Q000378:metabolism; D004706:Endodeoxyribonucleases / Q000378:metabolism*; D004926:Escherichia coli / Q000201:enzymology / Q000378:metabolism*; D029968:Escherichia coli Proteins; D046911:Macromolecular Substances; D013057:Spectrum Analysis / Q000379:methods; D014466:Ultraviolet Rays
D001426:Bacterial Proteins; D004279:DNA, Viral; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; D046911:Macromolecular Substances; C058093:UvrB protein, E coli; D004706:Endodeoxyribonucleases; C066567:UvrC protein, E coli; C036385:endodeoxyribonuclease uvrABC; C068631:UvrA protein, E coli; D000251:Adenosine Triphosphatases; D004265:DNA Helicases