B3 domain

The B3 DNA binding domain (DBD) is a highly conserved domain found exclusively in transcription factors (≥40 species) () combined with other domains (). It consists of 100-120 residues, includes seven beta strands and two alpha helices that form a DNA-binding pseudobarrel protein fold (); it interacts with the major groove of DNA.
B3 families.
In "Arabidopsis thaliana", there are three main families of transcription factors that contain B3 domain:
 and are only known NMR solution phase structures of the B3 DNA Binding Domain.
Related proteins.
The N-terminal domain of restriction endonuclease EcoRII; the C-terminal domain of restriction endonuclease BfiI possess a similar DNA-binding pseudobarrel protein fold.