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Table 1 Occurrence of the ten unique dinucleotide steps in the four datasets (numbers in parentheses indicate percentage occurrence).

From: Small local variations in B-form DNA lead to a large variety of global geometries which can accommodate most DNA-binding protein motifs

  Occurence
  RNA Free Complex HTH
Dinucleotide Sequence*   All A-like (Z p > 1.3 Å) B-like (Z p ≤ 0.8 Å) All Excl. TEH† All Excl. TC ‡
AA/TT 15 (5.4) 45 (11.1) NA 45 (21.5) 211 (17.2) 126 (16.2) 259 (16.6) 208 (15.0)
AG/CT 29 (10.5) 17 (4.2) 3 (1.5) 14 (6.7) 151 (12.3) 92 (11.8) 138 (8.9) 120 (8.7)
GA/TC 19 (6.9) 42 (10.3) 2 (1.0) 40 (19.1) 142 (11.6) 71 (9.1) 164 (10.5) 151 (10.9)
GG/CC 36 (13.0) 97 (23.9) 90 (45.9) 7 (3.3) 120 (9.8) 84 (10.8) 134 (8.6) 118 (8.5)
AC/GT 36 (13.0) 23 (5.7) 13 (6.6) 10 (4.8) 134 (10.9) 98 (12.6) 188 (12.1) 173 (12.5)
AT/AT 9 (3.3) 28 (6.9) 4 (2.0) 24 (11.5) 102 (8.3) 54 (6.9) 155 (9.9) 143 (10.3)
GC/GC 44 (15.9) 39 (9.6) 25 (12.8) 13 (6.2) 63 (5.1) 48 (6.2) 83 (5.3) 71 (5.1)
CA/TG (BI) 43 (15.6) 17 (4.2) 13 (6.6) 4 (1.9) 93 (7.6) 71 (9.1) 152 (9.7) 139 (10.0)
CA/TG (BII) NA 12 (3.0) NA 12 (5.7) 60 (4.9) 57 (7.3) 63 (4.0) 60 (4.3)
CG/CG 37 (13.4) 73 (18.0) 43 (21.9) 30 (14.4) 50 (4.1) 32 (4.1) 82 (5.3) 75 (5.4)
TA/TA 8 (3.0) 13 (3.2) 3 (1.5) 10 (4.8) 101 (8.2) 45 (5.8) 141 (9.0) 126 (9.1)
TOTAL 276 406 196 209 1227 778 1559 1384
  1. †TEH – TBP, Endonuclease and Hyperthermophile chromosomal protein SAC7D containing structures (excluded)
  2. ‡TC – TBP and CAP containing structures (excluded)
  3. * RNA oligomers contain Uracil (U) instead of Thymine (T). d(U)-containing steps are not included for the DNA datasets. The CA/TG step was classified as having BII conformation, if either the Cytosine or the Thymine base or both were observed to have the backbone torsion angle values ε - ζ > 0.