《英文msh詞典》Poly(A) RNA
[入口詞] Poly(A) RNA
[主題詞] RNA,Messenger
[英文釋義] RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end,referred to as the poly(A) tail. The function of this tail is not known for certain,but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm.