Reference: Bagby S, et al. (1995) Solution structure of the C-terminal core domain of human TFIIB: similarity to cyclin A and interaction with TATA-binding protein. Cell 82(5):857-67

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Abstract


TFIIB is an essential component of the machinery that transcribes protein-coding genes. The three-dimensional structure of the human TFIIB core domain (TFIIBc) has been determined using multidimensional heteronuclear magnetic resonance spectroscopy. The molecule consists of two direct repeats that adopt similar alpha-helical folds, conferring pseudo-twofold symmetry. An extensive, central basic surface including an amphipathic alpha helix is critical to the function of TFIIB as a bridge between the TBP-promoter complex and RNA polymerase II and associated general and regulatory transcription factors. Similarities between the TFIIBc and cyclin A folds indicate that elements of the eukaryotic cell cycle control apparatus evolved from more fundamental transcriptional control components, demonstrating a link between the transcription and cell cycle molecular machineries.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Bagby S, Kim S, Maldonado E, Tong KI, Reinberg D, Ikura M
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