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  • Title: Isolation and characterization of a regulatory mutant of an aminoacyl-transfer ribonucleic acid synthetase in Escherichia coli K-12.
    Author: Clarke SJ, Low B, Konigsberg W.
    Journal: J Bacteriol; 1973 Mar; 113(3):1096-103. PubMed ID: 4570769.
    Abstract:
    From Escherichia coli strain K28, which is temperature sensitive for growth because of a mutation in its seryl-transfer ribonucleic acid (tRNA) synthetase gene (serS), temperature-resistant mutants were selected which were found to have a fivefold higher level of seryl-tRNA synthetase than the parent strain. The "high-level" character was found to be genetically stable and is due to a mutation in a locus denoted serO. This locus was found to be very closely linked to serS on the genetic map, and the relative gene order was concluded to be serS-serO-serC. In a serO(-) strain, the normal dependence of seryl-tRNA synthetase (SerRS) activity on changes of exogenous serine concentration was not observed. In a stable heterozygous merodiploid, the serO(-) mutation is still expressed, i.e., it is cis dominant. These results strongly suggest that serO is an operator site involved in the control of the serS gene.
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