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Ubiquitin-Activating/Conjugating Activity of TAFII250, a Mediator of Activation of Gene Expression in Drosophila
Anh-Dung Pham,Frank Sauer*
Ubiquitination of histones has been linked to the complex processes
that regulate the activation of eukaryotic transcription.However, the
cellular factors that interpose this histone modificationduring the
processes of transcriptional activation are not wellcharacterized. A
biochemical approach identified the Drosophilacoactivator
TAFII250, the central subunit within the general
transcriptionfactor TFIID, as a histone-specific
ubiquitin-activating/conjugatingenzyme (ubac). TAFII250
mediates monoubiquitination of histoneH1 in vitro. Point mutations
within the putative ubac domain ofTAFII250 abolished
H1-specific ubiquitination in vitro. In theDrosophila
embryo, inactivation of the TAFII250 ubac activityreduces
the cellular level of monoubiquitinated histone H1 andthe expression
of genes targeted by the maternal activator Dorsal.Thus,
coactivator-mediated ubiquitination of proteins within thetransactivation pathway may contribute to the processes directingactivation of eukaryotic transcription.
Zentrum für Molekulare Biologie der Universität
Heidelberg (ZMBH), Im Neuenheimer Feld 282, 69120 Heidelberg,
Germany.
*
To whom correspondence should be addressed. E-mail:
f.sauer{at}mail.zmbh.uni-heidelberg.de
The editors suggest the following Related Resources on Science sites:
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PERSPECTIVES
Craig A. Mizzen and C. David Allis (29 September 2000) Science289 (5488), 2290.
[DOI: 10.1126/science.289.5488.2290] |Summary »|Full Text »
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