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Mol. Cell. Biol., Sep 1995, 4856-4866, Vol 15, No. 9
Y Ohkuma, S Hashimoto, CK Wang, M Horikoshi and RG Roeder
The general transcription factor TFIIE recruits TFIIH at a late stage of
transcription initiation complex formation and markedly stimulates
TFIIH-dependent phosphorylation of the carboxy-terminal domain (CTD) of RNA
polymerase II. To study this function of TFIIE in more detail, systematic
deletion mutations were introduced into the large subunit of TFIIE
(TFIIE-alpha) and were analyzed with regard to their effects on
TFIIH-dependent CTD phosphorylation, TFIIE-dependent basal and enhancer-
dependent transcription, and interactions of TFIIE-alpha with both
TFIIE-beta and TFIIH. The amino (N)-terminal half of TFIIE-alpha, which
possesses several putative structural motifs, was sufficient for the
phosphorylation and transcription activities and for TFIIE-beta
interactions, whereas a site effecting both strong interactions with TFIIH
and large stimulatory effects on transcription and CTD phosphorylation was
localized to an acidic region near the carboxy (C) terminus. The fact that
these activities appear to be tightly linked supports the idea that TFIIE
interacts physically and functionally with TFIIH and that CTD
phosphorylation is essential for transcription under normal conditions. The
present results suggest that TFIIE, via its effect on TFIIH, may act as a
checkpoint for formation of a preinitiation complex.
Copyright © 1995, American Society for Microbiology
Analysis of the role of TFIIE in basal transcription and TFIIH-mediated carboxy-terminal domain phosphorylation through structure-function studies of TFIIE-alpha
Laboratory of Biochemistry and Molecular Biology, Rockefeller University, New York, New York 10021, USA.
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