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rnj | Metallo-beta-lactamase superfamily protein; An RNase that has endonuclease and 5'-3' exonuclease activity. The 5'-exonuclease activity acts on 5'-monophosphate but not 5'-triphosphate ends. Endonuclease activity can cleave within 4 nucleotides of the 5'-end of a triphosphorylated RNA. Plays the major role in pre-23S rRNA maturation, and a minor role in processing of pre- 5S and pre-16S rRNA. (558 aa) | ||||
orn | Oligoribonuclease; 3'-to-5' exoribonuclease specific for small oligoribonucleotides; Belongs to the oligoribonuclease family. (216 aa) | ||||
rph | Ribonuclease PH; Phosphorolytic 3'-5' exoribonuclease that plays an important role in tRNA 3'-end maturation. Removes nucleotide residues following the 3'-CCA terminus of tRNAs; can also add nucleotides to the ends of RNA molecules by using nucleoside diphosphates as substrates, but this may not be physiologically important. Probably plays a role in initiation of 16S rRNA degradation (leading to ribosome degradation) during starvation. (259 aa) |