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Mechanism of protein synthesis inhibition during stationary phase in Bacillus stearothermophil US

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Summary

The appearance of a protein (association factor I) in ribosomes from Bacillus stearothermophilus at stationary phase of growth is described. Association factor I is present on 30S subunits and 30S–50S ribosomal couples, but not on 50S subunits. This protein is responsible for the low levels of polyphenylalanine synthesis shown by stationary phase ribosomes. Association factor I is able to bind to free 30S–50S ribosomal couples but not to polysomes, and exerts its effect by inhibiting the initiation step of protein synthesis. Ribosomes preincubated with association factor I have a decreased ability for polypeptide snythesis directed phage mRNA or poly(U).

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Garcia-Patrone, M. Mechanism of protein synthesis inhibition during stationary phase in Bacillus stearothermophil US . Mol Cell Biochem 31, 97–103 (1980). https://doi.org/10.1007/BF00240815

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