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. 1980 Oct;144(1):173–178. doi: 10.1128/jb.144.1.173-178.1980

Salmonella typhimurium mutants with reduced levels of transfer ribonucleic acid-inhibitable endodeoxyribonucleolytic activity.

D J Zabel, M Trucksis, R E Depew
PMCID: PMC294614  PMID: 6252190

Abstract

Two methods of mutagenesis, chemical alkylation and insertion of the tetracycline resistance transposon Tn10, were used to generate mutants of Salmonella typhimurium which had reduced levels of endodeoxyribonucleolytic activity. The chemically induced mutations defined a locus, endA, which was cotransduced with serA at a low frequency and with metK at a high frequency. Three-factor crosses revealed that metK was between serA and endA. The major endodeoxyribonucleolytic activity in crude extracts of s. typhimurium was similar to the activity of Escherichia coli endonuclease I. A Tn10 insertion mutation of endA resulted in the most severe loss of endodeoxyribonucleolytic activity among the endA alleles studied. Two of the chemically induced mutations resulted in activities which were more thermolabile than the wild-type activity.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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