Table 4.

Average torsion angles and phosphorous-phosphorous distances for RNA strand in dsRNA, L-aTNA/RNA, and SNA/RNA duplexes.

Duplex	α [deg]	β [deg]	γ [deg]	δ [deg]	ε [deg]	ζ [deg]	χ [deg]	P–P [Å]
dsRNA	−66.1	172.0	63.9	78.7	−149.7	−72.0	−160.8	5.8
	(4.6)	(4.7)	(30.7)	(2.6)	(5.5)	(5.7)	(4.1)	(0.3)
L-aTNA/RNA	−75.4	173.3	53.1	78.4	−153.8	−75.6	−171.4	6.0
	(22.9)	(10.2)	(47.6)	(7.4)	(7.8)	(8.5)	(5.1)	(0.3)
SNA/RNA	−95.0	162.0	100.2	81.9	−149.5	−99.9	−171.7	6.1
	(53.8)	(28.9)	(71.8)	(9.5)	(20.2)	(73.5)	(7.9)	(0.4)

Average values were calculated from the duplex regions of crystal structures of dsRNA, L-aTNA/RNA (G1 ~ _BrU6), and SNA/RNA (G1 ~ _BrU6).