About This Page:

This page first provides some general reference information about the 16S rRNA data set used to generate the base pair frequency data. Links to this information appear at appropriate places within the base pair frequency tables and associated help files.

Then, the list of base pairs is shown. When a link is selected from this table, the base pair frequencies and other selected data will appear in a separate tab or window (depending upon your browser settings).

16S rRNA Reference Sequence: Escherichia coli.

GenBank Accession #: J01695 Secondary Structure: PS | PDF

Alignments Used:

Code Descriptions # Sequences
B (eu)Bacteria 5859
A Archaea 264
C Chloroplasts 182
E Eucarya 1054
M Mitochondria 1160

The three phylogenetic domains are defined in (Woese, C. R., Kandler, O., & Wheelis, M.L. (1990) Proc. Natl. Acad. Sci. USA 87:4576-4579): Archaea, (eu)Bacteria, and Eucarya (nuclear).


16S rRNA AA.AG@helix.ends Base Pair List

BP/X EP Or LT M Conf SN Stacking XN
16:919 orange 5' M U A1 16,919 17:918 AA
26:557 green 5' M C absent ag
59:353 blue 3' M 2C absent aa
60:107 green 5' M 2C G3 107 61:106 AG
112:315   5' M   I 112,315 113:314 GA
143:220   3' M   I 143,220 142:221 GA
148:174 blue 3' I GA NH / ND nGC
159:162 yellow 3' H T, U S 159,162 158:163 AG
197:220 green 5' M C G3 220 198:219 (192:221) AG
246:282 orange 3' I C, X absent aa
297:300 yellow 3' H T, U S 297,300 296:301 AG
315:338 blue 5' M C absent aa
321:332   3' H U I 321,332 320:333, 322:329 GA
338:351 yellow 5' M C I 338,351 339:350 (316:337) AG
374:389orange 5' I C absent aa
380:383 yellow 3' H T S 380,383 379:384 AG
410:432 yellow 3' I GA S 410,432 409:433 AG
447:487 green 3' I E S 447,487 446:488 AG
451:482 orange 3' I GA absent aa
520:529 yellow 5' I X S 520,529 521:528 AG
675:715 orange 3' I GA A1 675,715 674:716, 676:714 AA
676:714 yellow 5' I GA I 676,714 675:715, 677:713 AG
687:700 blue 5' I   G3 700 688:699 AG
691:696 green 3' H U S 691,696 690:697 AG
780:802 red 3' I EL A3 780,802 779:803, 781:801 AA
782:800 yellow 5' I EL S 782,800 781:801, 783:799 AG
860:869 green 5' M X S 860,869 861:868 AG
888:909 red 3' I   S 888,909 887:910, 889:908 AG
898:901 yellow 3' H T, U S 898,901 897:902 AG
945:1236   5' M   I 945,1236 946:1235 GA
959:976 red 5' M GA absent ag
983:1222 yellow 5' M   G1 1222 984:1221 AG
1013:1016 yellow 3' H T, U S 1013,1016 1012:1017 AG
1067:1108 yellow 5' M C G3 1108 1068:1107 AG
1077:1080 yellow 3' H T, U S 1077,1080 1076:1081 AG
1157:1179 green 5' M   absent aa
1160:1176   5' I   I 1160,1176 1161:1175 GA
1248:1289 orange 3' I GU A7-1 1248,1289 1247:1290 AA
1266:1269 yellow 3' H T, U S 1266,1269 1265:1270 AG
1304:1333 green 3' I X S 1304,1333 1303:1334, 1305:1332 AG
1306:1331 blue 5' I   S 1306,1331 1305:1332, 1307:1330 AG
1349:1373 blue 5' M E S 1349,1373 1348:1374, 1350:1372 AG
1357:1365   3' H U I 1357,1365 1356:1366 GA
1398:1505 yellow 5' M   absent ag
1408:1493 red 3' I C* A1 1408 1407:1494 AA
1417:1483 red 3' I GA S 1417,1483 1416:1484, 1418:1482 AG
1418:1482 red 5' I GA S 1418,1482 1417:1483, 1419:1481 AG
1516:1519 blue 3' H T S 1516 1515:1520 AG