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Affinity purification of human DNA repair/transcription factor TFIIH using epitope-tagged xeroderma pigmentosum B protein.

Abstract
TFIIH is a high molecular weight complex with a remarkable dual function in nucleotide excision repair and initiation of RNA polymerase II transcription. Mutations in the largest subunits, the XPB and XPD helicases, are associated with three inherited disorders: xeroderma pigmentosum, Cockayne's syndrome, and trichothiodystrophy. To facilitate the purification and biochemical characterization of this intricate complex, we generated a cell line stably expressing tagged XPB, allowing the immunopurification of the XPB protein and associated factors. Addition of two tags, a N-terminal hexameric histidine stretch and a C-terminal hemagglutinin epitope, to this highly conserved protein did not interfere with its functioning in repair and transcription. The hemagglutinin epitope allowed efficient TFIIH immunopurification to homogeneity from a fractionated whole cell extract in essentially one step. We conclude that the predominant active form of TFIIH is composed of nine subunits and that there is one molecule of XPB per TFIIH complex. The affinity-purified complex exhibits all expected TFIIH activities: DNA-dependent ATPase, helicase, C-terminal domain kinase, and participation in in vitro and in vivo nucleotide excision repair and in vitro transcription. The affinity purification procedure described here is fast and simple, does not require extensive chromatographic procedures, and yields highly purified, active TFIIH.
AuthorsG S Winkler, W Vermeulen, F Coin, J M Egly, J H Hoeijmakers, G Weeda
JournalThe Journal of biological chemistry (J Biol Chem) Vol. 273 Issue 2 Pg. 1092-8 (Jan 09 1998) ISSN: 0021-9258 [Print] United States
PMID9422774 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • DNA-Binding Proteins
  • Epitopes
  • Transcription Factors
  • Transcription Factors, TFII
  • XPBC-ERCC-3 protein
  • Transcription Factor TFIIH
  • DNA Helicases
Topics
  • Blotting, Western
  • Cell Line, Transformed
  • Chromatography, Affinity (methods)
  • DNA Helicases
  • DNA Repair
  • DNA-Binding Proteins (metabolism)
  • Epitopes (metabolism)
  • Humans
  • Transcription Factor TFIIH
  • Transcription Factors (isolation & purification)
  • Transcription Factors, TFII

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