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• W2020092849 abstract "Ts-694 is a temperature sensitive mutant of hamster cells which is blocked in the G1 phase of the cell cycle at the restrictive temperature of 39 degrees. A comparison of the Lys-tRNA isoacceptors by RPC-5 chromatography showed a decrease in tRNA5Lys and an increase in tRNA4Lys at 39 degrees. This was identical to the changes seen in confluent cultures at the permissive temperature of 33 degrees. These Lys-tRNA changes were not seen in ts-694 cells blocked in G1 by isoleucine deficiency, nor in two other G1 ts mutants at the restrictive temperature. Cells trapped in S phase by a thymidine block also contained decreased levels of tRNA4Lys when raised to 39 degrees. Both tRNA4Lys levels and cell division increased when the cells were returned to the permissive temperature. An in vitro assay was established for the modification of tRNA5Lys to tRNA4Lys with tRNA6Lys and tRNA2Lys as intermediates. The first reaction is the synthesis of tRNA6Lys which involves the introduction of a modified uridine at the third position of the anticodon. Extracts of 694 cells grown at 33 degrees were able to modify rat liver [3H] tRNA5Lys to tRNA6Lys and tRNA4Lys in vitro when assayed at 25 degrees but not at 39 degrees. Extracts of Balb/c 3T3 cells, however, were more active at 39 degrees than at 25 degrees showing that the normal enzyme is not temperature sensitive. Ts-694 cell tRNA, isolated from cells grown at 33 degrees was aminoacylated at both 25 degrees and 39 degrees with rat liver synthetases. tRNA4Lys was present at both temperatures indicating that ts-694 cells do not contain a temperature sensitive tRNA4Lys." @default.
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• W2020092849 date "1984-01-01" @default.
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• W2020092849 title "Lysine tRNA and cell division: A G₁, cell cycle mutant is temperature sensitive for the modification of tRNA₅^Lysto tRNA₄^Lys" @default.
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• W2020092849 doi "https://doi.org/10.1093/nar/12.23.9009" @default.
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