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poly-A tail
About 250 A residues added to the 3' end of mRNA.
The poly-A site is determined by the AAUAAA signal sequence in the mRNA.
The role of the poly A tail is an enigma. mRNA without a poly-A tail can be transported out of the nucleus & it serves an effective template for protein synthesis. mRNAs for histone proteins do not have a poly-A tail.
Related
AAUAAA signal sequence
messenger RNA
poly-A site
General
mRNA motif
References
Biochemistry, L. Stryer, WH Freeman & Co, New York, 1988 pg 721