Source:http://linkedlifedata.com/resource/umls/id/C0032401
MSH: An enzyme that catalyzes the synthesis of polyadenylic acid from ATP. May be due to the action of RNA polymerase (EC 2.7.7.6) or polynucleotide adenylyltransferase (EC 2.7.7.19). EC 2.7.7.19.,NCI: Nuclear or cytoplasmic human Riboadenylate Transferases (Poly A Polymerase Family) catalyze template-independent post-transcriptional extension of the 3 prime end of an RNA strand by nonspecific and CPSF/AAUAAA-dependent polyadenylation activity during eukaryotic mRNA maturation. The N-terminal region appears required for nonspecific polymerase activity, while the N- and C-termini are required for specific polymerase activity. Specificity may occur through C-terminus interaction with CPSF, regulated by phosphorylation. The poly(A) reaction involves endoribonucleolytic pre-RNA cleavage at the poly(A) site and synthesis of the poly(A) tail. (NCI)