The characterisation of a fragment of ribosomal protein S4 that is protected against trypsin digestion by 16S ribosomal RNA of Escherichia coli

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Abstract
After mild trypsin treatment of a complex of ribosomal protein S4 and 16S RNA of Escherichia coli, a large homogeneous fragment of the S4 protein was protected against digestion by its RNA binding site. This fragment was isolated and characterised for molecular weight. It was able to rebind specifically to 16S RNA. Preliminary results indicate that protected protein fragments can also be obtained from other proteins that complex specifically with 23S and 5S RNA.

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