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• W1991001661 abstract "The cleavage specificities of the RNase P holoenzymes from Escherichia coli and the yeast Schizosaccharomyces pombe and of the catalytic M1 RNA from E. coli were analyzed in 5'-processing experiments using a yeast serine pre-tRNA with mutations in both flanking sequences. The template DNAs were obtained by enzymatic reactions in vitro and transcribed with phage SP6 or T7 RNA polymerase. The various mutations did not alter the cleavage specificity of the yeast RNase P holoenzyme; cleavage always occurred predominantly at position G + 1, generating the typical seven base-pair acceptor stem. In contrast, the specificity of the prokaryotic RNase P activities, i.e. the catalytic M1 RNA and the RNase P holoenzyme from E. coli, was influenced by some of the mutated pre-tRNA substrates, which resulted in an unusual cleavage pattern, generating extended acceptor stems. The bases G - 1 and C + 73, forming the eighth base pair in these extended acceptor stems, were an important motif in promoting the unusual cleavage pattern. It was found only in some natural pre-tRNAs, including tRNA(SeCys) from E. coli, and tRNAs(His) from bacteria and chloroplasts. Also, the corresponding mature tRNAs in vivo contain an eight base pair acceptor stem. The presence of the CCA sequence at the 3' end of the tRNA moiety is known to enhance the cleavage efficiency with the catalytic M1 RNA. Surprisingly, the presence or absence of this sequence in two of our substrate mutants drastically altered the cleavage specificity of M1 RNA and of the E. coli holoenzyme, respectively. Possible reasons for the different cleavage specificities of the enzymes, the influence of sequence alterations and the importance of stacking forces in the acceptor stems are discussed." @default.
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• W1991001661 date "1991-02-01" @default.
• W1991001661 modified "2023-09-26" @default.
• W1991001661 title "Sequence changes in both flanking sequences of a Pre-tRNA influence the cleavage specificity of RNase P" @default.
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• W1991001661 doi "https://doi.org/10.1016/0022-2836(91)90522-8" @default.
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