. Author manuscript; available in PMC: 2012 Dec 1.

Published in final edited form as: Biophys Chem. 2011 Aug 27;159(2-3):321–327. doi: 10.1016/j.bpc.2011.08.005

Table 1.

Crystal structure Tyr to Trp distances and calculated energy transfer efficiencies

Acceptor	Donor	κ²	R_o	R	E
W10	Y26	0.199	12.5	27.1	0.009
	Y43	0.025	8.8	33.1	0.0004
	Y57	0.282	13.2	12.4	0.597
	Y64	0.070	10.5	18.8	0.029
W12	Y26	0.536	14.7	22.8	0.068
	Y43	2.474	19.0	29.4	0.068
	Y57	0.029	9.0	10.9	0.248
	Y64	0.084	10.8	21.9	0.014

Distances, R, (Å) measured between center of Tyr ring and midpoint of bond between Trp Cδ2 and Cε2 (see Fig. 1). Dipole orientation factor, κ², Förester critical distance, R_o, and energy transfer efficiency, E, calculated from equations (2) and (3) as described in text.