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Cell-free protein synthesizing extracts incubated with purified preparations of colicin E(3) showed a marked decrease of their protein synthesizing activity. Incubation of ribosomes prepared from S-30 extracts with E(3) resulted in their inactivation. Their 16S RNA was found to lose a terminal fragment, similar in size to the fragment released upon in vivo treatment with E(3). Extracts derived from colicinogenic strains are resistant to the action of E(3)in vitro.
Thierry Boon (Fri,) studied this question.
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