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Functional modifications of the translational system in Bacillus subtilis during sporulation

Extracts of sporulating cells were found to be defective in vitro translation of phage SP01 ribonucleic acid (RNA) and vegetative Bacillus subtilis RNA. The activity of washed ribosomes from sporulating cells was very similar to that of washed ribosomes from vegetative cells in translating polyuridylic acid, SP01 RNA, and vegetative RNA. The S-150 fraction from either vegetative or sporulating cells grown in Difco sporulation medium contained an apparent inhibitor of protein synthesis. The crude initiation factor fraction from ribosomes of sporulating cells was defective in promoting the initiation factor-dependent translation of SP01 RNA. The crude initiation factor preparations from sporulating cells were as active as the corresponding preparations from vegetative cells in promoting the initiation factor-dependent translation of either phage Qbeta or phage T4 RNA by washed Escherichia coli ribosomes. The crude initiation factors from sporulating cells were perhaps more active than those from vegetative cells in promoting the initiation factor-dependent synthesis of phage T4 lysozyme by E. coli ribosomes. The crude initiation factor preparations from either vegetative or stationary-phase cells of an asporogenous mutant showed similar ability to promote the in vitro translation of SP01 RNA.