Polyribonucleotide nucleotidyltransferase

UniProtKB accession:  P05055

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UniProtKB description:  Involved in mRNA degradation. Catalyzes the phosphorolysis of single-stranded polyribonucleotides processively in the 3'- to 5'-direction. Also involved, along with RNase II, in tRNA processing. RNases II and R contribute to rRNA degradation during starvation, while RNase R and PNPase are the major contributors to quality control of rRNA during steady state growth (PubMed:21135037). Contributes to degradation of some small RNAs (sRNA) (PubMed:34210798).