Scientific background: |
TBP, TATA-binding protein, is a general transcription factor that binds specifically to a DNA sequence called the TATA box. The TBP gene is mapped to 6q27. This DNA sequence is found about 35 base pairs upstream of the transcription start site in some eukaryotic gene promoters.[1] TBP, along with a variety of TBP-associated factors, make up the TFIID, a general transcription factor that in turn makes up part of the RNA polymerase II preinitiation complex.[2] As one of the few proteins in the preinitiation complex that binds DNA in a sequence-specific manner, it helps position RNA polymerase II over the transcription start site of the gene. However, it is estimated that only 10-20% of human promoters have TATA boxes. Therefore, TBP is probably not the only protein involved in positioning RNA polymerase II. |
References: |
1. Bauer, P., Laccone, F., Rolfs, A., Wullner, U., Bosch, S., Peters, H., Liebscher, S., Scheible, M., Epplen, J. T., Weber, B. H. F., Holinski-Feder, E., Weirich-Schwaiger, H., Morris-Rosendahl, D. J., Andrich, J., Riess, O.Trinucleotide repeat expansion in SCA17/TBP in white patients with Huntington's disease-like phenotype.J. Med. Genet. 41: 230-232, 2004.
2. Stevanin, G., Fujigasaki, H., Lebre, A.-S., Camuzat, A., Jeannequin, C., Dode, C., Takahashi, J., San, C., Bellance, R., Brice, A., Durr, A.Huntington's disease-like phenotype due to trinucleotide repeat expansions in the TBP and JPH3 genes.Brain 126: 1599-1603, 2003.
3. Veenstra, G. J. C., Weeks, D. L., Wolffe, A. P.Distinct roles for TBP and TBP-like factor in early embryonic gene transcription in Xenopus.Science 290: 2312-2314, 2000.
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