Last modified on 14 July 2000.
| Position b | Percent A c | Percent AG c | Predicted Structure Motifs d | Loop e | Position | Percent A | Percent AG | Predicted Structure Motifs | |
|---|---|---|---|---|---|---|---|---|---|
| Hairpin Loops | Internal Loops | ||||||||
| 16S rRNA | 16S rRNA | ||||||||
| 300 | 100 | 100 | A, U | GNRA | 246 + | 100 | 100 | A | |
| 1080 | 100 | 90 | A, U | GNRA | 520 | 100 | 100 | A | |
| 1269 | 100 | 72 | A, U | GNRA | 665 | 70 | 67 | ||
| 687 | 100 | 97 | A | ||||||
| 23S rRNA | 802 | 100 | 99 | A, EL | |||||
| 167 | 100 | 99 | 9* | 1252 | 72 | 68 | |||
| 251 | 100 | 98 | A | 5* | 1275 | 93 | 92 | ||
| 322 | 100 | 71 | 3 | 1418 | 100 | 98 | A, GA | ||
| 466 | 100 | 79 | A, U | GNRA | 1456 + | 82 | 73 | ||
| 492 | 99 | 75 | 5* | ||||||
| 646 | 87 | 86 | 5* | 23S rRNA | |||||
| 1073 | 100 | 100 | U | 9 | 84 | 100 | 98 | ||
| 1098 | 99 | 99 | A, U | 6* | 244 | 100 | 99 | A, GA, E | |
| 1618 | 98 | 95 | A | 6* | 294 + | 100 | 88 | A | |
| 1755 | 100 | 73 | 3 | 861 | 100 | 96 | A, GA, E | ||
| 2147 | 95 | 95 | 4* | 878 | 86 | 73 | |||
| 2534 | 54 | 53 | 6 | 1111 | 100 | 100 | |||
| 2598 | 100 | 100 | A, U | GNRA | 1237 | 100 | 82 | ||
| 2662 # | 100 | 100 | A, U | GNRA | 1268 | 100 | 65 | A, GA, E | |
| 1373 + | 100 | 91 | EL | ||||||
| Multi-Stem Loops | 1434 | 78 | 58 | ||||||
| 16S rRNA | 1439 | 90 | 56 | ||||||
| 8 | 98 | 98 | 1477 | 92 | 88 | A, GA, EL | |||
| 26 + | 100 | 99 | A | 1866 | 99 | 90 | A, GA | ||
| 288 | 100 | 92 | 2126 | 100 | 100 | A, GA | |||
| 353 | 98 | 98 | A | 2158 | 100 | 99 | |||
| 523 + | 100 | 99 | 2298 + | 91 | 67 | ||||
| 828 | 80 | 71 | 2320 | 60 | 51 | ||||
| 860 | 96 | 88 | A | 2388 + | 100 | 100 | |||
| 1046 + | 100 | 99 | 2639 | 100 | 78 | A, GA | |||
| 1067 | 100 | 100 | A, U | ||||||
| Bulge Loops | |||||||||
| 23S rRNA | 16S rRNA | ||||||||
| 177 + | 59 | 58 | A | 583 + | 100 | 100 | |||
| 324 + | 73 | 55 | 777 | 100 | 96 | ||||
| 332 | 100 | 88 | |||||||
| 374 | 100 | 67 | A, GA, E | 23S rRNA | |||||
| 532 + | 65 | 61 | 213 + | 100 | 100 | ||||
| 627 | 99 | 98 | A, GA | 764 + | 100 | 60 | |||
| 655 | 98 | 98 | A, GA | 941 + | 100 | 99 | |||
| 699 + | 99 | 95 | A | 1205 + | 76 | 67 | |||
| 945 | 99 | 76 | A | 1490 + | 97 | 96 | |||
| 975 | 99 | 99 | A | 1586 | 90 | 79 | |||
| 1189 | 100 | 99 | A, GA, E | 2602 + | 100 | 100 | |||
| 1342 | 100 | 100 | U | ||||||
| 1791 | 100 | 98 | A | ||||||
| 1932 | 100 | 100 | A, GA, EL | ||||||
| 2119 | 100 | 100 | |||||||
| 2587 | 100 | 83 | A, U | ||||||
| 2629 | 63 | 57 | |||||||
a rRNA positions have an AG motif in more than 50% of the bacterial sequences and are indicated in blue on Figure 5. b The position number is the nucleotide at the 3’ loop end, at the loop-helix junction; +, the nucleotide prior to this position is base-paired; #, Sarcin/Ricin loop. c More detailed information is available at http://www.rna.icmb.utexas.edu/ANALYSIS/A-STORY/. d A, AA.AG@helix.ends; E, E loop; EL, E-like loop; GA, tandem G:A; U, U-turn (see discussion). e Hairpin loop size and special characteristics: GNRA, tetraloops (Woese et al. 1990) occur in more than 70% of the bacterial rRNA sequences; *, unusually stable G:A or U:U first mismatch.