Abstract
These studies were designated to investigate the effect of chlortetracycline on sedimentation properties of polysomes and ribosomes present in the chlortetracycline producing strain ofStreptomyces aureofaciens. In presence of chlortetracycline polysomes and ribosomes are more stable than the bacterial ones. At lower chlortetracycline concentrations (1–5 μg/ml) dissociation of polysomes into 70 S monomers was not observed. Ribosomes in higher concentration of chlortetracycline (400 μg/ml) form aggregates. A decrease of Mg2+ to 0.1mm caused dissociation of ribosomes to two subunits and in this state none of indicated concentrations of chlortetracycline caused aggregation. The exact sedimentation values of ribosomes and ribosomal subunits were calculated from extrapolation to infinite dilution. S20,w for monomer form was 68.8, and for ribosomal subunits 49.8 and 31.2 respectively. Ribosomal RNA sedimentates as two Schlieren peaks of 16 S and 22 S. It was found that 30 S subunits contain 15 structural proteins, while 21 proteins were resolved from 50 S subunits.
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Mikulík, K., Blumauerová, M., Vaněk, Z. et al. Characterization of ribosomes of a strain ofStreptomyces aureofaciens producing chlortetracycline. Folia Microbiol 16, 24–30 (1971). https://doi.org/10.1007/BF02887331
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DOI: https://doi.org/10.1007/BF02887331