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- W1567655755 abstract "Ribonuclease T2, nuclease S1, and snake venom phosphodiesterase were used as a structural probe for investigation of the interaction between Escherichia coli tRNAfMet and methionyl-tRNA synthetase, and the cleavage sites were analyzed by a rapid sequencing gel electrophoresis of 5'-32P-labeled tRNA. Both endonucleases cleaved the D-loop of synthetase-bound tRNA much more extensively than that of the free tRNA. Positions of A14, G15, A22, and G23 in the D-loop and C35 in the anticodon of the synthetase-bound tRNA were more susceptible to RNase T2. The synthetase-bound tRNA was predominantly cleaved by nuclease S1 at position of G15, G19, G20, and G23 in the D-loop and G2 in the acceptor stem. In contrast, the synthetase-bound tRNA was more resistant to the 3'-exonuclease, snake venom phosphodiesterase, than was the free tRNA molecule. These results suggest conformational change of the tRNA by the synthetase binding which weakened tertiary interaction between the D-loop and T psi C-loop/extra-loop. Production of acid-soluble radioactivity was also examined in the limited digestion of 5'-32P-labeled tRNA or 3'-14C-labeled methionyl-tRNA. The synthetase enhanced the release of acid-soluble oligonucleotides from the 5'-end of the tRNA but suppressed that from the 3'-end of the molecule. These results are consistent with that obtained by gel electrophoresis." @default.
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- W1567655755 date "1981-09-01" @default.
- W1567655755 modified "2023-09-27" @default.
- W1567655755 title "Methionyl-tRNA synthetase-induced conformational change of Escherichia coli tRNAfMet." @default.
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- W1567655755 doi "https://doi.org/10.1016/s0021-9258(19)52547-9" @default.
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