Abstract:Infection of RNase III− (rnc) Escherichia coli cells with bacteriophage T4Δ27, a deletion mutant missing seven out of the ten genes in the tRNA transciption unit, results in the accumulation of tRNA precursor (10.5‐SRNA) that contains the sequence of tRNAGln, tRNALeu and species 1 RNA [Pragai and Apirion (1981) J. Mol. Biol. 153, 619–630]. In vitro studies, using partially purified RNase III or cell extracts and 10.5‐S RNA as substrate, have revealed a cleavage site at the 5′ side of the molecule.
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