Summary
In spite of considerable effort there is still serious disagreement in the literature about the question of whether epitopes of ribosomal protein S4 are accessible for antibody binding on the intact small ribosomal subunit. We have attempted to resolve this issue using three independent approaches: (i) a re-investigation of the exposure and the location of epitopes of ribosomal protein S4 on the surface of the 30S subunit and 30S core particles of the E. coli ribosome, including rigorous controls of antibody specificity, (ii) a similar investigation of protein S4 from Bacillus stearothermophilus and (iii) the labelling of residue Cys-31 of E. coli S4 with a fluorescein derivative the accessibility of which towards a fluorescein-specific antibody was demonstrated directly by fluorimetry. In each of the three cases the antigen (E. coli S4, B. stearothermophilus S4 or fluorescein) was found to reside on the small lobe.
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Stöffler-Meilicke, M., Epe, B., Woolley, P. et al. Location of protein S4 on the small ribosomal subunit of E. coli and B. stearothermophilus with protein- and hapten-specific antibodies. Mol Gen Genet 197, 8–18 (1984). https://doi.org/10.1007/BF00327916
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DOI: https://doi.org/10.1007/BF00327916