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.
Belongs to the CAF1 family. Contains 1 R3H domain.
Nucleus. Cytoplasm. Nucleus > nucleolus. Some nuclear fraction is nucleolar.
ab125185, at 6 µg/mg lysate, detecting PARN in HeLa cell lysate (1 mg of immunoprecipitate, 20% loaded in the lane) by Immunoprecipitation.
For the subsequent Western blot, ab125185 was used at 1 µg/ml.
The blot was developed using the ECL technique, with an exposure time of 3 seconds.