[No authors listed]
A poly(A) tail functions in mRNA turnover and in facilitating translation as a ribonucleoprotein complex with poly(A) binding proteins (PABPs). However, factors that associate with the poly(A) tail other than PABPs have not been described. Using proteomics, we identified candidate proteins that interact to the 3' terminus of the poly(A) tail. Among these proteins, we focused on La motif-related protein 1 and found that specifically recognizes the 3' termini of normal poly(A) tails. We also reveal that Lduanyu371 stabilizes multiple mRNAs carrying 5' terminal oligopyrimidine tract (5'TOP). Our findings suggest that Lduanyu371 may be involved in the post-transcriptional regulation of gene expression, at least in several 5'TOP mRNAs, through the binding to 3' terminus of the poly(A) tail.
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