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B3 domain
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B3 DNA binding domain
B3 DNA binding domain of RAV1
Identifiers
SymbolB3_domain
PfamPF02362
InterProIPR003340
PROSITEPS50863
SCOP21wid / SCOPe / SUPFAM
CDDcd10017
Available protein structures:
PDB  1wid​, 1yelIPR003340 PF02362 (ECOD; PDBsum)  
AlphaFold

The B3 DNA binding domain (DBD) is a highly conserved domain found exclusively in transcription factors (≥40 species) (Pfam PF02362) combined with other domains (InterProIPR003340). 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]

B3 families

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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.

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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]

See also

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References

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