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. 1996 Sep 1;24(17):3283–3288. doi: 10.1093/nar/24.17.3283

In the TTF-1 homeodomain the contribution of several amino acids to DNA recognition depends on the bound sequence.

D Fabbro, G Tell, A Leonardi, L Pellizzari, C Pucillo, R Lonigro, S Formisano, G Damante
PMCID: PMC146104  PMID: 8811078

Abstract

The thyroid transcription factor-1 homeodomain (TTF-1HD) shows a peculiar DNA binding specificity, preferentially recognizing sequences containing the 5'-CAAG-3' core motif. Most other homeodomains instead recognize sites containing the 5'-TAAT-3' core motif. Here, we show that TTF-1HD efficiently recognizes another sequence, called D1, devoid of the 5'-CAAG-3' core motif. Different experimental approaches indicate that TTF-1HD contacts the D1 sequence in a manner which is different to that used to interact with sequences containing the 5'-CAAG-3' core motif. The binding activities that mutants of TTF-1HD display with the D1 sequence or with the sequence containing the 5'-CAAG-3' core motif indicate that the role of several DNA-contacting amino acids is different. In particular, during recognition of the D1 sequence, backbone-interacting amino acids not relevant in binding to sequences containing the 5'-CAAG-3' core motif play an important role. In the TTF-1HD, therefore, the contribution of several amino acids to DNA recognition depends on the bound sequence. These data indicate that although a common bonding network exists in all of the HD/DNA complexes, peculiarities important for DNA recognition may occur in single cases.

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Selected References

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