Table A.3.

Effect of stretching on the lowest-frequency normal twisting mode and elastic modulus of a 100 bp ideal DNA homopolymer^*

Coupled variables	r (Å)	(r - req)/req (%)	Y/Y0†	${\nu }_1^{\mathrm{str}}$ (cm-1)	C (10-19 erg-cm)
	353.4	5.0	1.00	0.189	2.15
Tilt-Roll	353.4	5.0	1.00	0.189	2.15
Tilt-Twist	353.4	5.0	1.00	0.190	2.17
Tilt-Shift	353.4	5.0	1.00	0.189	2.15
Tilt-Slide	353.4	5.0	1.00	0.189	2.15
Tilt-Rise	353.3	5.0	1.02	0.189	2.15
Roll-Twist	353.4	5.0	1.00	0.191	2.19
Roll-Shift	353.4	5.0	1.00	0.189	2.15
Roll-Slide	353.4	5.0	1.00	0.189	2.15
Roll-Rise	353.1	4.9	1.04	0.190	2.15
Twist-Shift	353.4	5.0	1.00	0.187	2.12
Twist-Slide	353.4	5.0	1.00	0.187	2.10
Twist-Rise	353.5	5.0	1.00	0.197	2.35
Shift-Slide	353.4	5.0	1.00	0.189	2.15
Shift-Rise	353.6	5.1	0.98	0.188	2.15
Slide-Rise	353.7	5.1	0.97	0.188	2.15
Roll-Twist, Twist-Rise	353.4	5.0	1.00	0.202	2.47
Twist-Slide, Twist-Rise	353.4	5.0	1.00	0.197	2.35
Roll-Twist, Twist-Slide	353.4	5.0	1.00	0.205	2.53
Roll-Twist, Twist-Slide, Twist-Rise	353.4	5.0	1.00	0.212	2.72

^*Dimeric rest state: $({\theta }_1^0,{\theta }_2^0,{\theta }_3^0,{\theta }_4^0,{\theta }_5^0,{\theta }_6^0)=(0°,0°,36°,0\mathrm{Å},0\mathrm{Å},3.4\mathrm{Å})$.

^§Young’s modulus, Y , of the restrained duplex with designated conformational properties compared to that, Y₀, of the free, ideal DNA duplex without coupling.