title: Specific regions of beta-globin RNA are resistant to nuclease digestion in RNA-protein complexes in chicken reticulocyte nuclei.
abstract: The interaction between beta-globin RNA and proteins in chicken reticulocyte nuclei was studied by determining the sequence of nuclease-resistant beta-globin RNA. Two types of nuclease-resistant RNAs were isolated for this study: endogenous nuclease-resistant RNA from 50S heterogeneous nuclear RNA-protein complexes and micrococcal nuclease-resistant nuclear RNA from whole nuclei. The nuclease-resistant regions were identified with the use of a RNA mapping method we recently developed (J.R. Patton and C.-B. Chae, J. Biol. Chem. 258:3991-3995, 1983). We found that beta-globin RNA is assembled into heterogeneous nuclear RNA-protein complexes in a specific manner. There are several regions of nuclease resistance in the first and third exons interrupted at regular intervals by sensitive regions. The second exon has only one nuclease-resistant region. The resistant regions range in size from 20 to 50 nucleotides. This organization may reflect a specific mode of assembly for heterogeneous nuclear RNA-protein complexes.
mesh_terms: D000818:Animals; D001483:Base Sequence; D002645:Chickens / Q000378:metabolism; D005914:Globins / Q000235:genetics*; D034441:Heterogeneous-Nuclear Ribonucleoproteins; D008836:Micrococcal Nuclease / Q000378:metabolism; D012323:RNA Processing, Post-Transcriptional; D012332:RNA, Heterogeneous Nuclear / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism*; D012156:Reticulocytes / Q000378:metabolism; D012260:Ribonucleases / Q000378:metabolism; D012261:Ribonucleoproteins / Q000378:metabolism*
chemical_list: D034441:Heterogeneous-Nuclear Ribonucleoproteins; D012332:RNA, Heterogeneous Nuclear; D012333:RNA, Messenger; D012261:Ribonucleoproteins; D005914:Globins; D012260:Ribonucleases; D008836:Micrococcal Nuclease