Table 3.

Selected helical parameters for r(CC^4′SCCGGGG)₂^a,b

Base pair	Tilt (°)	Roll (°)	Twist (°)	Buckle (°)	Prop. (°)	Open. (°)	Rise (Å)
C(1)–G(16)	−3.0 (−2.6)	1.2 (−2.8)	30.9 (31.6)	10.2 (8.4)	−15.3 (−11.6)	1.2 (−2.1)	2.8 (2.8)
C(2)–G(15)	−2.6 (−2.3)	−5.0 (−1.6)	33.0 (35.0)	10.5 (12.0)	−25.2 (−19.1)	−1.6 (−0.2)	3.3 (2.9)
4′SC(3)–G(14)	−0.l (0.5)	7.7 (0.9)	34.0 (31.8)	7.8 (8.5)	−17.0 (−13.4)	8.9 (2.2)	2.5 (2.8)
C(4)–G(13)	−0.8 (−1.1)	4.6 (4.3)	30.9 (32.6)	−0.7 (3.8)	−10.3 (−12.0)	1.6 (2.0)	2.8 (2.7)
G(5)–C(12)	0.1 (0.0)	5.0 (4.2)	27.2 (30.5)	−5.0 (−3.3)	−11.1 (−7.1)	1.6 (1.1)	2.5 (2.6)
G(6)–4′SC(11)	3.2 (−0.6)	4.6 (1.3)	36.1 (33.0)	−3.0 (−3.3)	−12.4 (−10.8)	9.3 (4.6)	2.8 (2.9)
G(7)–C(10)	2.5 (4.3)	−2.5 (−1.3)	33.9 (33.2)	−11.1 (−9.0)	−18.2 (−12.6)	−2.9 (1.7)	3.2 (3.0)
				−12.1 (−10.9)	−23.4 (−20.9)	2.8 (0.9)
Average	−0.1	2.2	32.3	−0.4	−16.6	2.6	2.8
SD	2.5	4.6	2.9	9.1	5.5	4.4	0.3

^aCalculated with the program CURVES (44).

^bParameters for the native [r(C₄G₄)]₂ duplex in parentheses (38).