Table 5 Mean and standard deviation values (given in parentheses, reported only for datasets with size ≥ 5) for twist for the ten dinucleotide steps containing Watson-Crick basepairs.

RNA

Free

Complex

HTH

Dinucleotide Sequence*

A-like (Z _p > 1.3 Å)

B-like (Z _p ≤ 0.8 Å)

All

Excl. TEH†

All

Excl. TC ‡

AA/TT

31.1 (3.3)

NA

36.1 (3.9)

30.8 (7.3)

34.4 (3.8)

33.9 (6.0)

35.1 (3.5)

AG/CT

31.0 (3.3)

31.8 NA

32.5 (7.0)

33.4 (5.1)

34.1 (4.5)

33.0 (5.6)

33.5 (4.0)

GA/TC

31.5 (2.6)

24.1 NA

37.7 (3.4)

33.9 (5.0)

35.0 (3.6)

34.8 (4.3)

34.9 (4.4)

GG/CC

30.6 (2.2)

30.5 (3.2)

31.2 (5.3)

33.4 (4.0)

33.5 (4.2)

32.3 (4.4)

32.4 (4.5)

AC/GT

31.0 (2.7)

33.1 (1.4)

33.6 (5.7)

30.9 (3.7)

31.2 (3.2)

30.7 (4.1)

30.8 (4.0)

AT/AT

31.1 (1.7)

33.6 NA

33.5 (3.9)

28.4 (6.5)

32.3 (3.6)

31.5 (4.0)

32.0 (2.8)

GC/GC

32.4 (5.6)

33.0 (2.7)

38.2 (2.8)

32.6 (5.7)

33.2 (5.7)

32.5 (4.7)

32.5 (4.9)

CA/TG (BI)

31.2 (2.9)

29.1 (2.6)

36.5 NA

33.9 (4.9)

33.5 (3.7)

33.0 (5.0)

33.2 (4.3)

CA/TG (BII)

NA

NA

49.1 (2.4)

39.3 (5.9)

39.5 (6.0)

38.0 (5.2)

38.2 (4.5)

CG/CG

29.7 (2.1)

29.3 (3.7)

32.2 (5.6)

36.0 (6.4)

37.2 (3.0)

35.0 (5.8)

35.1 (5.5)

TA/TA

30.0 (1.1)

27.7 NA

34.7 (6.4)

29.3 (9.1)

35.1 (7.3)

34.9 (7.6)

36.4 (6.0)

Overall

31.1 (3.4)

30.6 (3.5)

35.8 (5.9)

32.4 (6.4)

34.1 (4.8)

33.3 (5.5)

33.8 (4.7)

Fibre-Model

30.8

36.0