Structure and function of the b/HLH/Z domain of USF.
Ferre-D'Amare, A.R., Pognonec, P., Roeder, R.G., Burley, S.K.(1994) EMBO J 13: 180-189
- PubMed: 8306960 
- Primary Citation of Related Structures:  
1AN4 - PubMed Abstract: 
The basic/helix-loop-helix/leucine zipper (b/HLH/Z) transcription factor upstream stimulatory factor (USF) and its isolated DNA binding domain undergo a random coil to alpha-helix folding transition on recognizing their cognate DNA. The USF b/HLH cocrystal structure resembles the structure of the b/HLH/Z domain of the homologous protein Max and reveals (i) that the truncated, b/HLH DNA binding domain homodimerizes, forming a parallel, left-handed four-helix bundle, and (ii) that the basic region becomes alpha-helical on binding to the major groove of the DNA sequence CACGTG ...