Abstract
The secondary structures of ribosomal RNAs have been deduced by comparative sequence analysis. The same approach has also suggested some higher-order tertiary interactions. Some of these are now being tested by direct experiment, and it is clear that tertiary interactions play an important functional role in stabilizing protein-binding sites and folding the ribosomal RNAs into their functional forms. At the same time, diverse experimental data on the relative positioning of RNA segments and proteins within the ribosome are being incorporated into low-resolution models of the ribosome, which reveal a distinctive domain organization of the RNA.
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