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We investigated the contribution of peripheral stem-loops to the catalytic activity of an archaeal RNase P RNA, PhopRNA, from Pyrococcus horikoshii OT3. PhopRNA mutants, in which the stem-loops were individually deleted, were prepared and characterized with respect to precursor tRNA (pre-tRNA) cleavage activity in the presence of five RNase P proteins. All the mutants retained the activity to some extent, indicating that they are moderately implicated in catalysis. Further characterization suggested that the stem-loops serve largely as binding sites for the proteins, and that their interactions are predominantly involved in stabilization of the active conformation of PhopRNA.

The Contribution of Peripheral Stem-Loops to the Catalytic Activity of Archaeal RNase P RNA fromPyrococcus horikoshiiOT3