Trans-acting RNA inhibits tRNA suppressor activity in vivo |
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| Authors: | Attardi Domenica Gandini Tocchini-Valentini Glauco P |
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| Affiliation: | Istituto di Biologia Cellulare, Consiglio Nazionale delle Ricerche, Monterotondo Scalo, RM, Italy. |
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| Abstract: | We constructed two aptamers, each of which contains a 7-nt-long loop complementary to the anticodon loop of a suppressor tRNA. One of these aptamers can form a stable bimolecular complex with the suppressor tRNA in vitro and protects the 7 nt in the suppressor's anticodon loop from RNase S1. An Escherichia coli strain, carrying an amber mutation in the lac Z gene, produces beta-galactosidase only if the suppressor is present; the aptamer's coexpression in the cell inhibits the activity of the suppressor tRNA. Moreover, in E. coli extract, the aptamer partially inhibits the read-through of the stop codon on the part of the suppressor tRNA. These results point to a novel strategy that need not be limited to the suppressor tRNA. By constructing appropriate inducible aptamers, it may well be possible to effectively control translation in vivo. |
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