Crystal Structure of the Yeast TFIIA/TBP/DNA Complex

The crystal structure of the yeast TFIIA/TBP/TATA promoter complex was solved to 3 angstrom resolution by double-edge multiple wavelength anomalous diffraction from two different species of anomalous scattering elements in the same crystal. The large and small subunits of TFIIA associate intimately to form both domains of a two-domain folding pattern. TFIIA binds as a heterodimer to the side of the TBP/TATA complex opposite to the side that binds TFIIB and does not alter the TBP/DNA interaction. The six-stranded β-sandwich domain interacts with the amino-terminal end of TBP through a stereospecific parallel β-strand interface and with the backbone of the TATA box and the 5′-flanking B-DNA segment. The four-helix-bundle domain projects away from the TBP/TATA complex, thereby presenting a substantial surface for further protein-protein interactions.

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