B3 DNA binding domain | |||||||||||
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![]() B3 DNA binding domain of RAV1 | |||||||||||
Identifiers | |||||||||||
Symbol | B3_domain | ||||||||||
Pfam | PF02362 | ||||||||||
InterPro | IPR003340 | ||||||||||
PROSITE | PS50863 | ||||||||||
SCOP2 | 1wid / SCOPe / SUPFAM | ||||||||||
CDD | cd10017 | ||||||||||
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The B3 DNA binding domain (DBD) is a highly conserved domain found exclusively in transcription factors (≥40 species) (Pfam PF02362) combined with other domains (InterPro: IPR003340). It consists of 100-120 residues, includes seven beta strands and two alpha helices that form a DNA-binding pseudobarrel protein fold (SCOP 117343); it interacts with the major groove of DNA.[1]
In Arabidopsis thaliana, there are three main families of transcription factors that contain B3 domain:[2]
protein | ARF1-B3[dead link] | ABI3-B3[dead link] | RAV1-B3 |
---|---|---|---|
B3 structure derived by | molecular model[1] | molecular model[1] | NMR[1] |
B3 recognition sequence | TGTCTC[3][4] | CATGCA[5][6] | CACCTG[7] |
PDB: 1WID[1] and PDB: 1YEL[8] are only known NMR solution phase structures of the B3 DNA Binding Domain.
The N-terminal domain of restriction endonuclease EcoRII; the C-terminal domain of restriction endonuclease BfiI possess a similar DNA-binding pseudobarrel protein fold.[9][10]
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