Table 1. Location of pivoting positions in large and subunit rRNAs.

LSU helix	T. thermophilus	E. coli	S. cerevisiae–E. coli #s	S. cerevisiae
34	703-bulge	703 U-G	701 G-U	832 G-U
38	871 U-G	870 U-G	839 U-G	986 U-G
42	1032 U-G & bulge A	1032 U-G & bulge A	1033 bulge U	1208 bulge U
69	1907 G-U	1907 G-U	1907 G-U	2250 G-U
76	2096 U-G	2099 U-G	2095 G-U	2437 G-U
84	2298 bulge	2298 bulge	2298 bulge	2667 bulge
SSU helix
6	62 U-G	62 U-G	62 bulge	58 bulge
8	149 bulge	145 G-G	148 bulge	143 bulge
21	593 G-U	589 U-G	No analog	No analog
21es6c	No analog	No analog	Not defined	746 bulge
26	831 U-G	832 G-U	832 bulge	1042 bulge
28	1394 bulge A	1394 bulge A	1394 bulge A	1631 bulge A
31	955 3wj	955 3wj	955 3wj	1181 3wj
32	1212 bulge	1212-bulge	1212 bulge	1444 bulge
33a/b		1042-A Bulge	1040 Bulge	1225 bulge
36/37	1074 3wj	1074 3wj	1071 G-G 3wj	1291 G-G 3wj
39	1125 bulge	1125 bulge	1125 (Est) bulge	1346 bulge
40	1156 3wj	1156 3wj	1155 (Est) 3wj	1387 3wj
41	1247 bulge	1242 G-U	1247 (Est) bulge	1481 bulge
42	1304 bulge	1304-bulge	1304 bulge	1541 bulge
43	1351 U-G	1351 U-G	1351 G-U	G1588 G-U
44	1402 bulge	1402 bulge	1402 bulge	1639 bulge

All T. thermophilus position numbers are given as E. coli equivalents. To the extent possible, E. coli position numbers are also provided for S. cerevisiae (column 3). In addition, the actual S. cerevisiae positions are given (column 4). In some cases, the E. coli numbers are approximations and entered as estimates (Est). In instances where specific base-base interactions are identified the base type is followed by the position number. In the case of LSU helix 38 that region of the 16S rRNA was not well resolved in all crystal structures. In many cases, the pivot site is associated with a bulge and is indicated as such in the chart with the start position indicated.