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Proc Natl Acad Sci U S A
1993 Dec 15;9024:11583-7.
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DNA-binding properties and secondary structural model of the hepatocyte nuclear factor 3/fork head domain.
Li C
,
Tucker PW
.
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An 84-amino acid segment of QRF-1 [glutamine (Q)-rich factor 1], a newly cloned, B-cell-derived DNA-binding protein, shows significant sequence homology with the DNA-binding domains of the hepatocyte nuclear factor 3/fork head family of proteins. Here we demonstrate that this 84-amino acid domain is necessary and sufficient for DNA binding. We also propose a secondary structural model for the domain. At the N-terminal portion of the model, a basic hook structure is followed by two amphipathic helices separated by a turn. Invariant amino acid residues within the two proposed helices form the hydrophobic cores. An aromatic kink and a third amphipathic helix comprise the center of the domain. At the C terminus, two variable-length loops flank a putative 7-amino acid helix followed by a short basic region.
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