title: A unique nucleoprotein structure associated with the Drosophila melanogaster 18-28 S rDNA nontranscribed spacer.
abstract: We have detected unique nucleoprotein particles specific for the 18-28 S rDNA nontranscribed spacer of Drosophila melanogaster. The particles migrate between di- and trinucleosomes on nucleoprotein gels, and are between mono- and dinucleosomal in DNA length. These migration properties suggest that the nontranscribed spacer particles could have a protein component larger than a histone core. The variant nucleoprotein structures map primarily within the nontranscribed spacer 235 base pair internal subrepeat, which is AT-rich and possesses a 50 base pair sequence homologous to the RNA polymerase I binding site.
mesh_terms: D000818:Animals; D001482:Base Composition; D002460:Cell Line; D004275:DNA, Ribosomal / Q000235:genetics*; D004331:Drosophila melanogaster / Q000235:genetics*; D009693:Nucleic Acid Hybridization; D009698:Nucleoproteins / Q000235:genetics*; D012091:Repetitive Sequences, Nucleic Acid; D014158:Transcription, Genetic
chemical_list: D004275:DNA, Ribosomal; D009698:Nucleoproteins