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Nucleic Acids Research, 1984, Vol. 12, No. 24 9263-9269
© 1984

MOLECULAR BIOLOGY

Stable tRNA precursors in HeLa cells

Fumio Harada, Minoru Matsubara and Nobuyuki Kato

Virology Division, National Cancer Center Research Institute Tsukiji, Chuo-ku Tokyo 104, Japan

Received October 29, 1984. Revised November 28, 1984. Accepted November 28, 1984.

Two tRNA precursors were isolated from 32P-labeled or unlabeled HeLa cells by two dimensional polyacrylamide gel electrophoresis and were sequenced. These were the precursors of tRNAMet and tRNALeu, and both contained four extra nucleotides including 5'-triphosphates at their 5'-end and nine extra nucleotides including oligo U at their 3'-end. These RNAs are the first naturally occurring tRNA precursors from higher eukaryotes whose sequences have been determined. In these molecules, several modified nucleosides such as m2G, t6A and ac4C in mature tRNAs were undermodified. Two additional hydrogen bonds were formed in the clover leaf structures of these tRNA precursors. These extra hydrogen bonds may be responsible for the stabilities of these tRNA precursors.


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