Abstract
A defective specialized lambda transducing phage carrying the cysJ, cysI, cysH, and cysD genes has been isolated from a secondary-site lysogen. Deoxyribonucleic acid-ribonucleic acid (DNA-RNA) hybridization studies utilizing this phage have been carried out to detect cysteine-specific messenger RNA (cys mRNA) synthesized in vivo. A vivo. A 3.5- to 9-fold increase in the rate of synthesis of cys mRNA has been detected in the derepressed wild-type (Cys+) strain grown on glutathione compared with a repressed control grown on cystine. Pleiotropic cysE and cysB mutants grown on glutathione were found to possess rates of synthesis of cys mRNA that were significantly lower than their derepressed isogenic parent. The addition of O-acetyl-L-serine to the cysE strain produced a 5.5-fold increase in the rate of synthesis of cys mRNA. These results indicate that cysteine biosynthesis is controlled at the level of transcription by the inducer O-acetylserine, the cysB protein and cyst(e)ine.
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