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Fluorescence techniques were used to study conformational changes that occur in inactive E. coli 30 S ribosomal subunits during activation by heating in 12 mM Mg 2+ . Activation is associated with movement of a fluorophore on the 3'-end of 16 S RNA into a less polar environment and towards a probe on the cysteine thiol of ribosomal protein S21. The conformational change causes an apparent...
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