- The alpha-helical D1 domain of the tobacco bZIP transcription factor BZI-1 interacts with the ankyrin-repeat protein ANK1 and is important for BZI-1 function, both in auxin signaling and pathogen response. Kuhlmann, M., Horvay, K., Strathmann, A., Heinekamp, T., Fischer, U., Böttner, S., Dröge-Laser, W. J. Biol. Chem. (2003)