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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.
Kirillov et al. (Mon,) studied this question.