Three-dimensional arrangement of the Escherichia coli 16 S ribosomal RNA.

A model for the arrangement of the Escherichia coli 16 S ribosomal RNA in the 30 S ribosomal subunit is given. This model is based on the 16 S ribosomal RNA secondary structure, intramolecular RNA crosslinking results, protein-RNA interactions, and the locations of proteins within the 30 S subunit. These considerations allow placement of most of the RNA helices in approximate positions. The overall shape (that of an asymmetric Y) is very reminiscent of the description of the shape of the RNA made by direct determinations and is reasonably correlated to the appearance of the 30 S subunit. The identities of the three major secondary-structure domains of the 16 S ribosomal RNA are, for the most part, preserved. In addition, many close contacts between the 5' and middle RNA domains occur in the body of the particle. The 3'-terminal domain is situated in the central part of the model. This position corresponds to the region between the head and the platform structure in the 30 S subunit. The regions that represent the general locations of the messenger RNA and transfer RNA binding sites can be identified in the model.

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