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. 1987 Aug;169(8):3400–3408. doi: 10.1128/jb.169.8.3400-3408.1987

Isolation and characterization of a new globomycin-resistant dnaE mutant of Escherichia coli.

K Sakka, T Watanabe, R Beers, H C Wu
PMCID: PMC212409  PMID: 3112119

Abstract

We isolated a globomycin-resistant, temperature-sensitive mutant of Escherichia coli K-12 strain AB1157. The mutation mapped in dnaE, the structural gene for the alpha-subunit of DNA polymerase III. The in vivo processing of lipid-modified prolipoprotein was more resistant to globomycin in the mutant strain 307 than in its parent. The prolipoprotein signal peptidase activity was also increased twofold in the mutant, and there was a threefold increase in the activity of isoleucyl-tRNA synthetase. The results suggest that a mutation in dnaE may affect the expression of the ileS-lsp operon in E. coli. In addition, strain 307 showed a reduced level of streptomycin resistance compared with its parental strain AB1157 (rpsL31). Strain 307 was killed by streptomycin at a concentration of 200 micrograms/ml, which did not affect the rate of bulk protein synthesis in this mutant. A second mutation which was involved in the reduced streptomycin resistance in strain 307 was identified and found to be closely linked to or within the rpsD (ramA, ribosomal ambiguity) gene. Both dnaE and rpsD were required for the reduced streptomycin resistance in strain 307.

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Selected References

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