Abstract
The effect of ATP on the first step of excision repair of ultraviolet damage in DNA has been studied using toluene-treated E. coli. During postirradiation incubation, five to six times more single-strand breaks are formed in DNA in the presence of exogenous ATP than in its absence. The ATP-dependent as well as the ATP-independent endonucleolytic activities appear to be catalyzed by the same enzyme since both activities are almost completely absent in uvrA and uvrB mutants. An ATP-dependent endonucleolytic activity has been detected in nonirradiated toluene-treated E. coli. It is concluded that ATP is required in vivo for either the incision step of repair or an enzymatic reaction preceding it.
MeSH Terms
Adenosine Triphosphate/physiology
Centrifugation, Density Gradient
DNA Repair/drug effects
DNA, Bacterial/radiation effects
DNA, Single-Stranded/radiation effects
Endonucleases/metabolism
Escherichia coli/drug effects,enzymology,metabolism
Molecular Weight
Mutation
Radiation Dosage
Radiation Effects
Toluene/pharmacology
Ultraviolet Rays
Chemicals
DNA, Bacterial
DNA, Single-Stranded
Toluene
Adenosine Triphosphate
Endonucleases
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Waldstein E A
Sharon R
Ben-Ishai R
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22 references, click to expand
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