Affiliation:
1. Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, F-67404 Illkirch Cedex, C.U. de Strasbourg, 1 and
2. Institut Curie, Unité 434 de l’INSERM, 75248 Paris Cedex 05, 2 France
Abstract
ABSTRACT
The t(11;22) chromosomal translocation specifically linked to Ewing sarcoma and primitive neuroectodermal tumor results in a chimeric molecule fusing the amino-terminus-encoding region of the
EWS
gene to the carboxyl-terminal DNA-binding domain encoded by the
FLI-1
gene. As the function of the protein encoded by the
EWS
gene remains unknown, we investigated the putative role of EWS in RNA polymerase II (Pol II) transcription by comparing its activity with that of its structural homolog, hTAF
II
68. We demonstrate that a portion of EWS is able to associate with the basal transcription factor TFIID, which is composed of the TATA-binding protein (TBP) and TBP-associated factors (TAF
II
s). In vitro binding studies revealed that both EWS and hTAF
II
68 interact with the same TFIID subunits, suggesting that the presence of EWS and that of hTAF
II
68 in the same TFIID complex may be mutually exclusive. Moreover, EWS is not exclusively associated with TFIID but, similarly to hTAF
II
68, is also associated with the Pol II complex. The subunits of Pol II that interact with EWS and hTAF
II
68 have been identified, confirming the association with the polymerase. In contrast to EWS, the tumorigenic EWS–FLI-1 fusion protein is not associated with either TFIID or Pol II in Ewing cell nuclear extracts. These observations suggest that EWS and EWS–FLI-1 may play different roles in Pol II transcription.
Publisher
American Society for Microbiology
Subject
Cell Biology,Molecular Biology
Cited by
212 articles.
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