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J Biol Chem, Vol. 273, Issue 50, 33111-33114, December 11, 1998
From the MGC Department of Molecular Genetics, Leiden Institute of
Chemistry, Leiden University, P. O. Box 9502, 2300 RA Leiden, The Netherlands
The yeast Rad4 and Rad23 proteins form a complex
that is involved in nucleotide excision repair (NER). Their function in
this process is not known yet, but genetic data suggest that they act in an early step in NER. We have purified an epitope-tagged
Rad4·Rad23 (tRad4·Rad23) complex from yeast cells, using a clone
overproducing Rad4 with a hemagglutinin-tag at its C terminus.
tRad4·Rad23 complex purified by both conventional and immuno-affinity
chromatography complements the in vitro repair defect of
rad4 and rad23 mutant extracts, demonstrating
that these proteins are functional in NER. Using electrophoretic
mobility shift assays, we show preferential binding of the
tRad4·Rad23 complex to damaged DNA in vitro.
UV-irradiated, as well as
N-acetoxy-2-(acetylamino)fluorene-treated DNA, is
efficiently bound by the protein complex. These data suggest that
Rad4·Rad23 interacts with DNA damage during NER and may play a role
in recognition of the damage.
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