Archaeal transcription factor B

Archaeal transcription factor B (ATFB or TFB) (homologous to eukaryotic TFIIB, and more distantly to bacterial sigma factor[1]) is a polypeptide important in archaeal transcription.

Structure

TFB is comprised an amino-terminal region (TFBN) and a larger carboxyl-terminal region (TFBC).

TFBN is approximately one third of the protein and contains both a B-finger motif (homologous to the TFIIB B-finger) and a zinc-finger motif.

TFBC is folded into a globulus which binds to the TATA binding protein (TBP) and to TFB-recognition elements (BRE) upstream of the TATA box. These bindings are important for transcription polarity.[2]

References

  1. ↑ Burton, Samuel P; Burton, Zachary F (6 November 2014). "The σ enigma: Bacterial σ factors, archaeal TFB and eukaryotic TFIIB are homologs". Transcription. 5 (4): e967599. doi:10.4161/21541264.2014.967599.
  2. ↑ http://www.pnas.org/content/96/24/13662.full


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