Here shows human HSF1 alone.

Title: Northeast Structural Genomics Consortium Target HR3023C.
Authors: Liu, G., Xiao, R., Ciccosanti, C., Janjua, H., Acton, T.B., Lee, H., Wang, H.B., Huang, Y.B., Everett, J.K., Montelione, G.T., Northeast Structural Genomics Consortium.
To Be Published.

PDB ID: 2LDU

Here shows the structure of human HSF1 binding with it's target, heat-shock element.
The α3 helix(shown in green) inserts into the major groove of DNA.

Title: Structure of human heat-shock transcription factor 1 in complex with DNA.
Authors: Neudegger, T., Verghese, J., Hayer-Hartl, M., Hartl, F.U., Bracher, A.
Journal: Nat Struct Mol Biol. 2016 Feb;23(2):140-6. (PubMed)

PDB ID: 5D5U

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