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The interaction between ribosomal protein L11 from Escherichia coli and in vitro synthesized RNA containing its binding site from 23S rRNA was characterized by identifying nucleotides that interfered with complex formation when chemically modified by diethylpyrocarbonate or hydrazine. Chemically modified RNA was incubated with L11 under conditions appropriate for specific binding of L11 and the resulting protein-RNA complex was separated from unbound RNA on Mg(2+)-containing polyacrylamide gels. The ability to isolate L11 complexes on such gels was affected by the extent of modification by either reagent. Protein-bound and free RNAs were recovered and treated with aniline to identify their content of modified bases. Exclusion of RNA containing chemically altered bases from L11-associated material occurred for 29 modified nucleotides, located throughout the region corresponding to residues 1055-1105 in 23S rRNA. Ten bases within this region did not reproducibly inhibit binding when modified. Multiple bands of RNA were consistently observed on the nondenaturing gels, suggesting that significant intermolecular RNA-RNA interactions had occurred.

nucleic acids research

A Chemical interference study on the interaction of ribosomal protein L11 from<i>Escherichia coli</i>with RNA molecules containing its binding iste from 23S rRNA

A Chemical interference study on the interaction of ribosomal protein L11 fromEscherichia coliwith RNA molecules containing its binding iste from 23S rRNA