Poly(A)-specific ribonuclease PARN - O95453 (PARN_HUMAN)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

 
Function
3'-exoribonuclease that has a preference for poly(A) tails of mRNAs, thereby efficiently degrading poly(A) tails. Exonucleolytic degradation of the poly(A) tail is often the first step in the decay of eukaryotic mRNAs and is also used to silence certain maternal mRNAs translationally during oocyte maturation and early embryonic development. Interacts with both the 3'-end poly(A) tail and the 5'-end cap structure during degradation, the interaction with the cap structure being required for an efficient degradation of poly(A) tails. Involved in nonsense-mediated mRNA decay, a critical process of selective degradation of mRNAs that contain premature stop codons. Also involved in degradation of inherently unstable mRNAs that contain AU-rich elements (AREs) in their 3'-UTR, possibly via its interaction with KHSRP. Probably mediates the removal of poly(A) tails of AREs mRNAs, which constitutes the first step of destabilization (PubMed:10882133, PubMed:11359775, PubMed:12748283, PubMed:15175153, PubMed:9736620). Also able to recognize and trim poly(A) tails of microRNAs such as MIR21 and H/ACA box snoRNAs (small nucleolar RNAs) leading to microRNAs degradation or snoRNA increased stability (PubMed:25049417, PubMed:22442037). UniProt
Catalytic Activity
Exonucleolytic cleavage of polyA to 5'-AMP. UniProt
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Subunit Structure
Homodimer (PubMed:10801819, PubMed:16281054). Found in a mRNA decay complex with RENT1, RENT2 and RENT3B (PubMed:14527413). Interacts with KHSRP (PubMed:15175153). Interacts with CELF1/CUGBP1 (PubMed:16601207). Interacts with ZC3HAV1 in an RNA-independent manner (PubMed:21876179). Interacts with DHX36 (PubMed:14731398). UniProt
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