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Mol. Cell. Biol., Dec 1995, 6653-6662, Vol 15, No. 12
RJ White, TM Gottlieb, CS Downes and SP Jackson
Inactivation of the TATA-binding protein-containing complex TFIIIB
contributes to the mitotic repression of RNA polymerase III transcription,
both in frogs and in humans (J. M. Gottesfeld, V. J. Wolf, T. Dang, D. J.
Forbes, and P. Hartl, Science 263:81-84, 1994; R. J. White, T. M. Gottlieb,
C. S. Downes, and S. P. Jackson, Mol. Cell. Biol. 15:1983-1992, 1995).
Using extracts of synchronized proliferating HeLa cells, we show that
TFIIIB activity remains low during the early part of G1 phase and increases
only gradually as cells approach S phase. As a result, the transcription of
all class III genes tested is significantly less active in early G1 than it
is in S or G2 phase, both in vitro and in vivo. The increased activity of
TFIIIB as cells progress through interphase appears to be due to changes in
the TATA- binding protein-associated components of this complex. The data
suggest that TFIIIB is an important target for the cell cycle regulation of
RNA polymerase III transcription during both mitosis and interphase of
actively proliferating HeLa cells.
Copyright © 1995, American Society for Microbiology
Cell cycle regulation of RNA polymerase III transcription
Wellcome/CRC Institute, University of Cambridge, United Kingdom.
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