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Table 6 Significant values from the "RNA Structure Query System." The 5' and 3' ends of helices and loops are based on the global orientation determined from the 5' and 3' ends of the entire RNA molecule. Values are for the Bacterial 16S and 23S rRNA comparative structure models.

From: The Comparative RNA Web (CRW) Site: an online database of comparative sequence and structure information for ribosomal, intron, and other RNAs

Number/Type of Nucleotides Structural Element
  Short Name High Low
single nuc total   
  paired (helix) G (36.57%) A (14.46%)
  5' helix end G (46.23%) U(13.52%)
  3' helix end C (38.07%) A (10.57%)
  5' loop end G (37.06%) C (10.33%)
adjacent nucs total GG (9.863%) UU (4.093%)
  in helix GG (14.06%) AA (1.981%)
  3'helix 5'loop CG (14.75%) UC(1.495%)
  loop/helix ratio AA (5.67934) CC (.112825)
base pairs total GC/CG (28.29%) CU/UC (0.1351%)
  5'helix end GC (38.76%) UC (0.09088%)
  3'helix end CG (38.77%) CU (0.09089%)
   Highest
three nucs total GGG (3.0%), GAA (2.6%), AAG (2.6%), GGA (2.5%), AGG (2.4%)  
  000 GAA (7.5%), AAA (6.7%), UAA (5.2%)  
  011 AGC (9.3%), AGG (8.8%)  
  100 CGA (7.6%), UGA (5.8%), GGA (5.3%)  
  110 GCG (6.9%), GGG (4.8%), GGA (4.7%)  
  001 AAG (14.4%), AAC (6.9%), GAG (5.4%)  
  101 CAG (7.2%)  
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