The DNA-dependent atpase activity of yeast nucleotide excision repair factor 4 and its role in DNA damage recognition

Sami N. Guzder, Patrick Sung, Louise Prakash, Satya Prakash

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


Saccharomyces cerevisiae RAD7 and RAD16 genes function together in the nucleotide excision repair of transcriptionally inactive DNA. The RAD7- and RAD16encoded proteins exist as a tight complex named nucleotide excision repair factor 4 or NEF4. Previously, we showed that NEF4 binds UV-damaged DNA with high specificity and with a dependence upon ATP and that inclusion of NEF4 to the reconstituted nucleotide excision repair system consisting of purified NEF1, NEF2, NEF3, and replication protein A results in marked stimulation of damage-specific DNA incision. Here we show that NEF4 possesses an ATPase activity that is entirely dependent on a DNA cofactor and that double-stranded DNA is twice as effective as single-stranded DNA in activating ATP hydrolysis. Even though DNA binding is promoted by the nonhydrolyzable ATP analogue adenosine 5'-O-(thiotriphosphate) (ATPγS), damage binding is more proficient with ATP than with ATPγS. Interestingly, UV irradiation of double-stranded DNA results in a pronounced attenuation of the ATPase activity. Taken together, our results suggest a model in which ATP hydrolysis by NEF4 fuels the translocation of NEF4 on DNA in search of UV lesions and damage binding by NEF4 leads to a down-regulation of the ATPase activity. Damage-bound NEF4 could then serve as a nucleation point for the assembly of other repair components.

Original languageEnglish (US)
Pages (from-to)6292-6296
Number of pages5
JournalJournal of Biological Chemistry
Issue number11
StatePublished - Mar 13 1998

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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