The TFIIH subunit p89 (XPB) localizes to the centrosome during mitosis.
BACKGROUND
The general transcription factor II H (TFIIH), comprised of a core complex and an associated CAK-complex, functions in transcription, DNA repair and cell cycle control. Mutations of the two largest subunits, p89 (XPB) and p80 (XPD), cause the hereditary cancer-prone syndrome xeroderma pigmentosum.


METHODS
The TFIIH subunit p89 was monitored during interphase and cell division by immunofluorescence staining, GFP-fusion constructs including deletions, live cell imaging and immuno-precipitations.


RESULTS
Here we demonstrate that during cell division, from prophase until telophase, the TFIIH core subunit p89, but not other subunits of TFIIH, associates with the centrosomes and the adjacent parts of the mitotic spindle. With overall constant levels throughout mitosis, p89 re-localizes to the newly formed nuclei by the end of mitosis. Furthermore, p89 interacts with the centrosomal protein gamma-tubulin. Truncations of p89 result in an abnormal subcellular distribution during interphase and abolished centrosomal association during mitosis.


CONCLUSIONS
Our observations suggest a so far unappreciated role for p89 in cell cycle regulation, and may be the structural basis for a long known, but hitherto unexplained interaction between p89 and tubulin.
Weber
Achim
A
Department of Pathology, Institute of Surgical Pathology, University Hospital Zurich, Zurich, Switzerland. achim.weber@usz.ch
Chung
Hye-Jung
HJ
Springer
Erik
E
Heitzmann
Dirk
D
Warth
Richard
R
D018385:Centrosome / Q000378:metabolism*; D004265:DNA Helicases / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans; D008938:Mitosis; D021381:Protein Transport; D014404:Tubulin / Q000378:metabolism
D004268:DNA-Binding Proteins; D014404:Tubulin; C072022:XPBC-ERCC-3 protein; D004265:DNA Helicases