Suzuki et al. 1997: When expressed and purified as a separate peptide, the B3 domain has a highly cooperative DNA binding activity that is specific for the Sph sequence. We find that the properties of this activity are in compelling agreement with the functional analyses of VP1 and regulatory sequences in the C7 promoter. These results identify a new class of DNA binding proteins, which thus far are known only in the plant kingdom, that have critical functions in development.
Members of this family SHOULD possess B3 domain SHOULD NOT possess AP2Auxin_resp domains
Nag, R; Maity, MK; Dasgupta, M. 2005. Dual DNA binding property of ABA insensitive 3 like factors targeted to promoters responsive to ABA and auxin. Plant Mol. Biol. 59(5):821-38 PUBMEDID:16270233 Suzuki, M; Kao, CY; McCarty, DR. 1997. The conserved B3 domain of VIVIPAROUS1 has a cooperative DNA binding activity. Plant Cell 9(5):799-807 PUBMEDID:9165754
Nakagawa, H; Ohkura, E; Ohmiya, K; Hattori, T. 1996. The seed-specific transcription factor VP1 (OSVP1) is expressed in rice suspension-cultured cells. Plant Cell Physiol. 37(3):355-62 PUBMEDID:8673344