Download MendeleyA new use for the 'wing' of the 'winged' helix-turn-helix motif in the HSF-DNA cocrystal.
Littlefield, O., Nelson, H.C.(1999) Nat Struct Biol 6: 464-470
- PubMed: 10331875
- DOI: https://doi.org/10.1038/8269
- Primary Citation of Related Structures:
3HTS - PubMed Abstract:
The 1.75 A crystal structure of the Kluyveromyces lactis heat shock transcription factor (HSF) DNA-binding domain (DBD) complexed with DNA reveals a protein-DNA interface with few direct major groove contacts and a number of phosphate backbone contacts that are primarily water-mediated interactions. The DBD, a 'winged' helix-turn-helix protein, displays a novel mode of binding in that the 'wing' does not contact DNA like all others of that class. Instead, the monomeric DBD, which crystallized as a symmetric dimer to a pair of nGAAn inverted repeats, uses the 'wing' to form part of the protein-protein contacts. This dimer interface is likely important for increasing the DNA-binding specificity and affinity of the trimeric form of HSF, as well as for increasing cooperativity between adjacent trimers.
Organizational Affiliation:
Department of Molecular and Cell Biology, University of California, Berkeley 94720-3206, USA.
