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Mol. Cell. Biol., 12 1997, 6803-6814, Vol 17, No. 12
D Tantin, A Kansal and M Carey
Cockayne's syndrome (CS) is a disease characterized by developmental and
growth defects, sunlight sensitivity, and a defect in transcription-
coupled nucleotide excision repair. The two principle proteins involved in
CS, CSA and CSB/ERCC6, have been hypothesized to bind RNA polymerase II
(Pol II) and link transcription to DNA repair. We have tested CSA and CSB
in assays designed to determine their role in transcription- coupled
repair. Using a unique oligo(dC)-tailed DNA template, we provide
biochemical evidence that CSB/ERCC6 interacts with Pol II molecules engaged
in ternary complexes containing DNA and nascent RNA. CSB is a DNA-activated
ATPase, and hydrolysis of the ATP beta-gamma phosphoanhydride bond is
required for the formation of a stable Pol II- CSB-DNA-RNA complex. Unlike
CSB, CSA does not directly bind Pol II.
Copyright © 1997, American Society for Microbiology
Recruitment of the putative transcription-repair coupling factor CSB/ERCC6 to RNA polymerase II elongation complexes
Molecular Biology Institute, UCLA School of Medicine, Los Angeles, California 90095-1737, USA.
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