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Here, we report the first characterization and partial purification of an archaeal tRNA 3′ processing activity, the RNase Z from Haloferax volcanii. The activity identified here is an endonuclease, which cleaves tRNA precursors 3′ to the discriminator. Thus tRNA 3′ processing in archaea resembles the eukaryotic 3′ processing pathway. The archaeal RNase Z has a KCl optimum at 5mM, which is in contrast...
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