Abstract
Current research is focusing on ribosome heterogeneity as a response to changing environmental conditions and stresses. Altered stoichiometry and composition of ribosomal proteins as well as association of additional protein factors are mechanisms for shaping the protein expression profile or hibernating ribosomes. In this updated chapter, we present a method for the isolation of ribosomes to analyze antibiotic-induced changes in the composition of ribosomes in Bacillus subtilis or other bacteria. Ribosomes and associated proteins are isolated by ultracentrifugation, and proteins are identified and quantified using label-free mass spectrometry.
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