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. Author manuscript; available in PMC: 2008 Aug 11.
Published in final edited form as: Langmuir. 2008 Feb 19;24(4):1330–1337. doi: 10.1021/la702299z

Table 2.

xu, ku, ΔGu‡, and K of Structural Segments of Bacteriorhodopsina

structural
segment		 xu (±SD)
(nm)		 ku (±SD)
(s−1)		 ΔGu‡ (kBT) K
(N/m)
α-helix G 0.16 ± 0.04 4.7 ± 8.9 × 10−1 21 6.9
loop GF 0.15 ± 0.02 1.8 ± 1.7 20 7.3
loop GF and
α-helix F		 0.42 ± 0.32 7.9 ± 53.6 × 10−2 23 1.1
α-helix F 0.32 ± 0.05 3.1 ± 3.2 × 10−1 22 1.8
α-helices
E and D		 0.33 ± 0.02 9.8 ± 7.4 × 10−3 25 1.9
α-helix E 0.44 ± 0.07 2.3 ± 5.3 × 10−4 29 1.2
α-helix D 0.58 ± 0.19 2.1 ± 9.4 × 10−4 29 0.7
α-helices
B and C		 0.69 ± 0.18 4.2 ± 13.6 × 10−4 28 0.5
α-helix C 0.39 ± 0.05 5.9 ± 5.1 × 10−2 24 1.3
α-helix C
and loop BC		 0.38 ± 0.09 7.3 ± 13.4 × 10−2 23 1.3
loop BC
and α-helix B		 0.37 ± 0.04 9.1 ± 7.7 × 10−2 23 1.4
loop BC 0.61 ± 0.18 1.4 ± 4.6 × 10−3 27 0.6
α-helix B 0.48 ± 0.07 6.6 ± 6.8 × 10−2 23 0.8
α-helix A (and
N terminus)		 0.68 ± 0.1 1.9 ± 3.6 × 10−4 29 0.5
a

Values shown for parameters xu and ku, obtained from DFS experiments26 indicate structural and energetic properties of each structural segment.