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. 1987 Nov;169(11):5087–5094. doi: 10.1128/jb.169.11.5087-5094.1987

Mutations in Escherichia coli that effect sensitivity to oxygen.

C S Jamison 1, H I Adler 1
PMCID: PMC213912  PMID: 3312165

Abstract

Fifteen oxygen-sensitive (Oxys) mutants of Escherichia coli were isolated after exposure to UV light. The mutants did not form macroscopic colonies when plated aerobically. They did form macroscopic colonies anaerobically. Oxygen, introduced during log phase, inhibited the growth of liquid cultures. The degree of inhibition was used to separate the mutants into three classes. Class I mutants did not grow after exposure to oxygen. Class II mutants were able to grow, but at a reduced rate and to a reduced final titer, when compared with the wild-type parent. Class III mutants formed filaments in response to oxygen. Genetic experiments indicated that the mutations map to six different chromosomal regions. The results of enzymatic assays indicated that 7 of the 10 class I mutants have low levels of catalase, peroxidase, superoxide dismutase, and respiratory enzymes when compared with the wild-type parent. Mutations in five of the seven class I mutants which have the low enzyme activities mapped within the region 8 to 13.5 min. P1 transduction data indicated that mutations in three of these five mutants, Oxys-6, Oxys-14, and Oxys-17, mapped to 8.4 min. The correlation of low enzyme levels and mapping data suggests that a single gene may regulate several enzymes in response to oxygen. The remaining three class I mutants had wild-type levels of catalase, peroxidase, and superoxide dismutase, but decreased respiratory activity. The class II and III mutants had enzyme activities similar to those of the wild-type parent. Our results demonstrate that mutations in at least six genes can be expressed as oxygen sensitivity. Some of these genes may be involved in respiration or cell division or may regulate the expression of several enzymes.

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Selected References

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