Nucleic Acids Research, Vol 24, Issue 13 2551-2559, Copyright © 1996 by Oxford University Press
PJ van der Spek, A Eker, S Rademakers, C Visser, K Sugasawa, C Masutani, F Hanaoka, D Bootsma and JH Hoeijmakers
The xeroderma pigmentosum syndrome complementation group C (XP-C) is due to
a defect in the global genome repair subpathway of nucleotide excision
repair (NER). The XPC protein is complexed with HHR23B, one of the two
human homologs of the yeast NER protein, RAD23 (Masutani at al. (1994) EMBO
J. 8, 1831-1843). Using heparin chromatography, gel filtration and native
gel electrophoresis we demonstrate that the majority of HHR23B is in a
free, non-complexed form, and that a minor fraction is tightly associated
with XPC. In contrast, we cannot detect any bound HHR23A. Thus the HHR23
proteins may have an additional function independent of XPC. The
fractionation behaviour suggests that the non-bound forms of the HHR23
proteins are not necessary for the core of the NER reaction. Although both
HHR23 proteins share a high level of overall homology, they migrate very
differently on native gels, pointing to a difference in conformation. Gel
filtration suggests the XPC-HHR23B heterodimer resides in a high MW
complex. However, immunodepletion studies starting from repair-competent
Manley extracts fall to reveal a stable association of a significant
fraction of the HHR23 proteins or the XPC-HHR23B complex with the basal
transcription/repair factor TFIIH, or with the ERCC1 repair complex.
Consistent with a function in repair or DNA/chromatin metabolism,
immunofluorescence studies show all XPC, HHR23B and (the free) HHR23A to
reside in the nucleus.
ARTICLES
XPC and human homologs of RAD23: intracellular localization and relationship to other nucleotide excision repair complexes
Department of Cell Biology and Genetics, Medical Genetic Centre, Erasmus University, Rotterdam, The Netherlands.
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