title: Proximity of 5.8 S RNA-binding proteins and A-site proteins in yeast ribosomes inferred from cross-linking.
abstract: In order to probe the spatial arrangement of proteins within the 5.8 S rRNA domain of the intact ribosomal subunit of Saccharomyces cerevisiae, 60 S ribosomal subunits were treated with 2-iminothiolane. Proteins were extracted from the cross-linked ribosomes, fractionated by Sephadex G-150 column chromatography, and analyzed by diagonal polyacrylamide-sodium dodecyl sulfate gel electrophoresis. Constituent proteins of cross-linked pairs were identified by two-dimensional polyacrylamide gel electrophoresis. Nine cross-links involving five of the 11 5.8 S rRNA-binding proteins were analyzed. A model showing the network of cross-links is presented. Several of the 5.8 S rRNA-binding proteins are in sufficiently close proximity of the ribosomal A-site proteins to be cross-linked.
mesh_terms: D002352:Carrier Proteins / Q000032:analysis*; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000032:analysis*; D046911:Macromolecular Substances; D012335:RNA, Ribosomal / Q000032:analysis*; D016601:RNA-Binding Proteins; D012269:Ribosomal Proteins / Q000032:analysis*; D012270:Ribosomes / Q000032:analysis* / Q000648:ultrastructure
chemical_list: D002352:Carrier Proteins; D046911:Macromolecular Substances; D012335:RNA, Ribosomal; D016601:RNA-Binding Proteins; D012269:Ribosomal Proteins