The Antennapedia homeodomain protein from Drosophila melanogaster bound to a fragment of DNA.[1] The recognition helix and unstructured N-terminus are bound in the major and minor grooves respectively.
^PDB1AHD; Billeter M, Qian YQ, Otting G, Müller M, Gehring W, Wüthrich K. Determination of the nuclear magnetic resonance solution structure of an Antennapedia homeodomain-DNA complex. Journal of Molecular Biology. Dec 1993, 234 (4): 1084–93. PMID 7903398. doi:10.1006/jmbi.1993.1661.