The U1A polyadenylation inhibition element (PIE) is an RNA element which is responsible for the regulation of the length of the polyA tail of the U1A protein pre-mRNA. The PIE is located in the U1A mRNA 3' UTR. PIE adopts a U-shaped structure, with binding sites for a single U1A protein at each bend and when complexed with the two proteins it blocks activity of poly(A) polymerase (PAP), and inhibits its activity.
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