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The sigma subunit of RNA polymerase from sporulating Bacillus subtilis is markedly inhibited in its ability to direct active transcription of phage varphie DNA in vitro. Treatment of sporulating bacteria with chloramphenicol rapidly restores sigma activity, suggesting that sporulating cells contain an inhibitor of sigma that is physiologically unstable or that becomes unstable after drug treatment. The hypothetical inhibitor is depleted exponentially with an apparent half-life of 11 min at 37 degrees .

Chloramphenicol Restores Sigma Factor Activity to Sporulating Bacillus subtilis