ジャーナル: Structure / 年: 2006 タイトル: Cryo-electron microscopy studies of human TFIID: conformational breathing in the integration of gene regulatory cues. 著者: Patricia Grob / Michael J Cruse / Carla Inouye / Marian Peris / Pawel A Penczek / Robert Tjian / Eva Nogales / 要旨: The multisubunit transcription factor TFIID is essential for directing eukaryotic promoter recognition and mediating interactions with activators/cofactors during assembly of the preinitiation ...The multisubunit transcription factor TFIID is essential for directing eukaryotic promoter recognition and mediating interactions with activators/cofactors during assembly of the preinitiation complex. Despite its central role in transcription initiation and regulation, structural knowledge of the TFIID complex has so far been largely limited to electron microscopy studies of negatively stained samples. Here, we present a cryo-electron microscopy 3D reconstruction of the large endogenous human TFIID complex. The improved cryopreservation has allowed for a more detailed definition of the structural elements in the complex and for the detection, by an extensive statistical analysis of the data, of a conformational opening and closing of the cavity central to the TFIID architecture. We propose that these density rearrangements in the structure are a likely reflection of the plasticity of the interactions between TFIID and its many partner proteins.
名称: human TFIID / タイプ: sample / ID: 1000 詳細: The sample was prepared from a single preparation of TFIID, immunopurified from HeLa cell nuclear extrats (TAF130 antibody) Number unique components: 1