title: Fluorescence studies on the location of L7/L12 relative to L10 in the 50S ribosome of Escherichia coli.
abstract: The localization of the protein L7/L12 relative to protein L10 in the Escherichia coli ribosome was studied by fluorescence energy transfer. N-[7-(Dimethylamino)-4-methylcoumarinyl]maleimide, coupled to Cys-70 of L10, served as a donor for fluorescein which was attached to Lys-51 or to the N terminus of L7/L12. The binding of the fluorescein-L7/L12 dimers to a strong and a weak binding site in 50S ribosomes could be distinguished. Therefore, it was possible to measure the distances between Cys-70 of L10 and Lys-51 and the N terminus of each L7/L12 dimer. For L7/L12 in the strong binding site, these two distances are both about 43 A, and for L7/L12 in the weak binding site, both are about 56 A.
mesh_terms: D004735:Energy Transfer; D004926:Escherichia coli / Q000648:ultrastructure*; D005452:Fluoresceins; D007202:Indicators and Reagents; D008301:Maleimides; D000080882:Ribosomal Protein L10; D012269:Ribosomal Proteins / Q000032:analysis*; D012270:Ribosomes / Q000648:ultrastructure*; D013050:Spectrometry, Fluorescence
chemical_list: D005452:Fluoresceins; D007202:Indicators and Reagents; D008301:Maleimides; D012269:Ribosomal Proteins; C019347:N-(7-dimethylamino-4-methylcoumarinyl)maleimide; C016700:ribosomal protein L7-L12