Cupric ion resistance as a new genetic marker of a temperature sensitive R plasmid, Rtsl in Escherichiacoli

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Abstract

A temperature sensitive kanamycin (Km) resistant R plasmid, Rtsl, was found to confer cupric ion (Cu2+) resistance on its hosts in Escherichiacoli. At conjugal transfer, two kinds of segregants were obtained from Rtsl, i.e. Cu2+ resistant, Km sensitive and Km resistant, Cu2+ sensitive plasmids. Protein T existed in E.coli cells harboring Rtsl or the CurKms-plasmid. The inhibitory effect on the host cell growth at 43°C was observed with Rtsl+ or the KmrCus-plasmid+ cells. A relationship between these Rtsl derivatives and Rtsl in Proteusmirabilis which has been studied was discussed.

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