title: Properties of a small transcribed poly A sequence in heterogeneous nuclear RNA of HeLa cells.
abstract: A class of heterogeneous nuclear RNA (hnRNA) molecules contain an internal transcribed poly A sequence of close to 25 uninterrupted AMP residues. HnRNA molecules containing this sequence are separable from those containing the large 3' terminal poly A sequence on the basis of their differential affinity for oligo dT cellulose. The fact that the transcribed small poly A and the 3' terminal poly A are not found in the same hnRNA molecules even though both are present in similar size classes and that the small poly A is absent from cytoplasmic messenger RNA (mRNA) has led us to propose a scheme for mRNA processing in which the 3' end of the small poly A in hnRNA becomes a priming size for the post-transcriptional addiction of the large poly A.
mesh_terms: D006367:HeLa Cells / Q000378:metabolism*; D006801:Humans; D009843:Oligoribonucleotides / Q000032:analysis; D011061:Poly A / Q000096:biosynthesis* / Q000302:isolation & purification; D012332:RNA, Heterogeneous Nuclear / Q000096:biosynthesis* / Q000302:isolation & purification; D012260:Ribonucleases; D012265:Ribonucleotides / Q000032:analysis; D014158:Transcription, Genetic
chemical_list: D009843:Oligoribonucleotides; D012332:RNA, Heterogeneous Nuclear; D012265:Ribonucleotides; D011061:Poly A; D012260:Ribonucleases