Nucleic Acids Research, 1994, Vol. 22, No. 15 3026-3032
© 1994
ENZYMOLOGY |
A new ATP-independent DNA endonuclease from Schizosaccharomyces pombe that recognizes cyclobutane pyrimidine dimers and 64 photoproducts
Departments of Biochemistry and Radiation Oncology, Emory University School of Medicine, Rollins Research Center Atlanta, GA 30322 1Center for Radiological Research, Columbia University College of Physicians and Surgeons 630 W. 168 Street, New York, NY 10032 2department of Chemistry, Washington University St Louis, MO 63130, USA
*To whom correspondence should be addressed
Received May 12, 1994. Revised July 6, 1994. We have discovered a new DNA endonuclease in the fission yeast Schizosaccharomyces pombe which recognizes cyclobutane pyrimidine dimers and (64) pyrimidine-pyrimidone photoproducts. S.pombe DNA endonuclease (SPDE) catalyzes a single ATPindependent incision immediately 5' to the UV photoproduct and generates termini containing 3' hydroxyl and 5' phosphoryl groups. Based on these properties, we propose that SPDE may function in a DNA repair capacity, representing the initial recognition/ cleavage step of a DNA excision repair pathway.
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