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Ribonuclease (RNase) Z is involved in the maturation of the 3′ ends of transfer RNAs (tRNAs) in all three kingdoms of life. To prevent futile cycles of CCA addition and removal, eukaryotic RNase Z discriminates against mature tRNAs bearing a CCA motif, with the first cytosine residue (C74) being the key antideterminant. Here, we show that, remarkably, the B. subtilis enzyme does not discriminate against...
RNase J is a key member of the β-CASP family of metallo-β-lactamases involved in the maturation and turnover of RNAs in prokaryotes. The B. subtilis enzyme possesses both 5′-3′ exoribonucleolytic and endonucleolytic activity, an unusual property for a ribonuclease. Here, we present the crystal structure of T. thermophilus RNase J bound to a 4 nucleotide RNA. The structure reveals an RNA-binding channel...
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