Quantitative study of interaction of deacylated tRNA with Escherichia coli ribosomes. Role of 50 S subunits in formation of the E site.

The 30 S subunit contains 2 sites for tRNA binding (Phe-tRNA, AcPhe-tRNA, tRNAPheOH) with the functional properties of D and A sites of the 70 S ribosome after attachment of 50 S subunit. The third (E) site specific for deacylated tRNA is introduced into 70 S ribosome by its 50 S subunit. The E-site binding of tRNAPheOH is not sensitive to either tetracycline and edeine, and practically codon-independent. The affinity constant of tRNAPheOH for the E site is 2-3 orders of magnitude lower than that for the D site.