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Crystal structure of negative cofactor 2 recognizing the TBP-DNA transcription complex
1Laboratory of Molecular Biophysics, 1230 York Avenue, New York, NY 10021, USA.
Cell
|July 20, 2001
Summary
Negative Cofactor 2 (NC2) binds TBP-DNA complexes, inhibiting transcription. Its structure reveals how NC2beta blocks transcription factor IIB recognition, elucidating a key regulatory mechanism.
Area of Science:
- Molecular Biology
- Structural Biology
- Biochemistry
Background:
- Negative Cofactor 2 (NC2) is a transcriptional repressor.
- TATA box-binding protein (TBP) is essential for transcription initiation.
- NC2 regulates TBP-DNA complex function.
Purpose of the Study:
- To determine the X-ray structure of the NC2-TBP-DNA ternary complex.
- To elucidate the molecular mechanism of NC2-mediated transcriptional repression.
Main Methods:
- X-ray crystallography at 2.6 A resolution.
Main Results:
- The structure reveals NC2 alpha and beta N termini mimic histones, forming a heterodimer.
- NC2 binds the TBP-DNA complex via electrostatic interactions.
- NC2beta's C-terminal helix interacts with TBP, blocking TFIIB binding.
Conclusions:
- The NC2 heterodimer structure provides insights into TBP-DNA complex regulation.
- NC2 acts as a direct inhibitor of transcription initiation by blocking TFIIB recruitment.
- The findings have implications for understanding transcriptional control mechanisms.
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