Fluorescence anisotropy studies performed on 6-demethylchlortetracycline, binding to the ribosome of E. coli in competition with tRNA at the P site or at both P and A sites, have provided a quantitative assessment in situ of the interaction of this antibiotic with the A site and have demonstrated that there is also an interaction between tetracycline and the P site.
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Epe et al. (1987) studied this question.