Abstract
Transcription factor IIIA (TFIIIA) is widely regarded as the archetypal zinc finger protein. It is a member of a very large multigene family of eukaryotic DNA-binding proteins. More than two decades of research have been dedicated to understanding its interaction with the 5S ribosomal RNA gene (5S DNA). TFIIIA has nine tandem C2H2 zinc fingers along the peptide sequence. The three-dimensional structure of the N-terminal 6 zinc fingers bound to 31 base pairs of DNA shows that not all fingers are equal. Four of them make contacts located on both DNA strands while two fingers act as spacers. Individual fingers can recognize overlapping and interlocking base pair quartets. Side chains in the short alpha helices of fingers contact bases in the major groove. It is likely that the linker sequences connecting adjacent zinc fingers evolved to dictate which fingers bind to DNA. Signals essential for transcription initiation of 5S DNA, nuclear localization, and nucleocytoplasmic transport of 5S ribosomal RNA (5S rRNA) are located in the C-terminal part of TFIIIA.
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Brown, R.S., Flint, J. (2005). TFIIIA: A Sophisticated Zinc Finger Protein. In: Iuchi, S., Kuldell, N. (eds) Zinc Finger Proteins. Molecular Biology Intelligence Unit. Springer, Boston, MA. https://doi.org/10.1007/0-387-27421-9_3
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DOI: https://doi.org/10.1007/0-387-27421-9_3
Publisher Name: Springer, Boston, MA
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