Table 1. FRET and bending parameters of the target DNAs upon binding of GCN4-bZIP dimer at 20°C in 100 mM KCl, 10 mM potassium phosphate (pH 6.0).

U-shaped DNA	FE	FRET efficiency (E)	Rda (Å)	Bend angle (°)
Free AP-1 DNA	0.1534 ± 0.0006	0.1163 ± 0.0005	70.1 ± 0.5	11 ± 1
Complex:bZIP:AP-1 DNA	0.1857 ± 0.0007a	0.1295 ± 0.0006	61.8 ± 1.5	20 ± 2
Free ATF/CREB DNA	0.1562 ± 0.0006	0.1252 ± 0.0006	69.1 ± 0.5	12 ± 1
Complex:bZIP:ATF/CREB DNA	0.2140 ± 0.0007a	0.3100 ± 0.0007	57.1 ± 1.5	25 ± 2

^aAsymptotic values of FRET effect.