title: Defective processing of ribosomal precursor RNA in Saccharomyces cerevisiae.
abstract: Saccharomyces cerevisiae (strain A224A) has an abnormal distribution of cytoplasmic ribosomal subunits when grown at 36 degrees C, with sucrose-gradient analysis of extracts revealing an apparent excess of material sedimenting at 60 S. This abnormality is not observed at either 23 degrees C or 30 degrees C. At 36 degrees C the defect(s) is expressed as a slowed conversion of 20 S ribosomal precursor RNA to mature 18 S rRNA, although the corresponding maturation of 27 S ribosomal precursor RNA to mature 25 S rRNA is normal. Studies on this yeast strain and on mutants derived from it may help to elucidate the role(s) of individual ribosomal components in controlling ribosome biogenesis in eukaryotes.
mesh_terms: D002499:Centrifugation, Density Gradient; D003593:Cytoplasm / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D009694:Nucleic Acid Precursors / Q000235:genetics / Q000378:metabolism*; D012322:RNA Precursors; D012323:RNA Processing, Post-Transcriptional; D012331:RNA, Fungal / Q000235:genetics / Q000378:metabolism*; D012335:RNA, Ribosomal / Q000235:genetics / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D013104:Spheroplasts / Q000378:metabolism
chemical_list: D009694:Nucleic Acid Precursors; D012322:RNA Precursors; D012331:RNA, Fungal; D012335:RNA, Ribosomal