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. 1989 Sep;171(9):5218–5221. doi: 10.1128/jb.171.9.5218-5221.1989

In vitro construction of gshB::kan in Escherichia coli and use of gshB::kan in mapping the gshB locus.

T Daws 1, C J Lim 1, J A Fuchs 1
PMCID: PMC210347  PMID: 2670910

Abstract

The Escherichia coli structural gene for glutathione synthetase, gshB, was cloned into pBR322. Plasmids containing gshB were able to complement the glutathione requirement of a trxA gshB double mutant, and cells containing the plasmids were found to have elevated levels of glutathione synthetase. A mutant gshB allele was constructed by inserting the kan gene from pUC4K into a unique HpaI site located within gshB. The resulting plasmid-encoded allele was used to replace a genomic gshB+ by homologous recombination. The resulting strain had no detectable glutathione synthetase activity. The gshB allele containing the kan insertion was used to map gshB on the E. coli chromosome by P1 transduction. The results indicated that gshB is located at 63.4 min, between metK and speC. The allele was further localized to a region of 3,100 to 3,120 kilobase pairs on the physical map (restriction map) of E. coli by DNA-DNA hybridization to a series of lambda bacteriophages (Y. Kohara, K. Akiyama, and K. Isono, Cell 50:495-508, 1987).

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Selected References

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