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Mol. Cell. Biol., Apr 1995, 1983-1992, Vol 15, No. 4
RJ White, TM Gottlieb, CS Downes and SP Jackson
The mitotic state is associated with a generalized repression of
transcription. We show that mitotic repression of RNA polymerase III
transcription can be reproduced by using extracts of synchronized HeLa
cells. We have used this system to investigate the molecular basis of
transcriptional repression during mitosis. We find a specific decrease in
the activity of the TATA-binding-protein (TBP)-containing complex TFIIIB.
TBP itself is hyperphosphorylated at mitosis, but this does not appear to
account for the loss of TFIIIB activity. Instead, one or more
TBP-associated components appear to be regulated. The data suggest that
changes in the activity of TBP-associated components contribute to the
coordinate repression of gene expression that occurs at mitosis.
Copyright © 1995, American Society for Microbiology
Mitotic regulation of a TATA-binding-protein-containing complex
Wellcome/CRC Institute, University of Cambridge, United Kingdom.
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