On the right-hand side of TBP, Geis depicts Transcription Factor II B (TFIIB) in purple, attached to the other components of the preinitiation complex. Geis positions and colors the purple protein farther back in the painting, depicting its collateral position.

Used with permission from the Howard Hughes Medical Institute (www.hhmi.org). All rights reserved.

Related PDB Entry: 1VOL

Experimental Structure Citation

Nikolov, D. B., Chen, H., Halay, E. D., Usheva, A. A., Hisatake, K., Lee, D. K., Roeder, R. G., & Burley, S. K. (1995). Crystal structure of a TFIIB-TBP-TATA-element ternary complex. Nature, 377, 119-128.


TFIIB is a general transcription factor that joins to form a TBP(TFIID)•TFIIB•DNA complex. After this complex is created, it can then be recognized by a complex of RNA Polymerase II and TFIIF.