Characteristics of RP4 Tellurite-resistance Transposon Tn521

Map of plasmid RP4 derived by insertion of transposon C.

Resistance of Thermus spp. to Potassium Tellurite.

Two members of the genus Thermus were examined for their resistance to toxic inorganic compounds. They both proved to be fairly resistant to tellurite and selenite and to many other heavy metal salts. Cell extracts of Thermus thermophilus HB8 and of T. flavus AT-62 catalyze the reduction of K(2)TeO(3) in a reaction which is dependent on NADH oxidation.

Tellurite and Tetracycixne Resistance in Enterococci

APPLEMAN, M. D. (University of Southern California, Los Angeles), AND I. M. HEINMILLER. Comparison of tellurite resistance and tetracycline resistance among the enterococci. Appl. Microbiol. 9:391-394. 1961.-A correlation was found to exist between tellurite and tetracycline resistance in the enterococci. Fleming (1932) reported that species of bacteria which were susceptible to penicillin were...

Transposon Encoding Fosfomycin Resistance

The determinant of resistance to fosfomycin of the Serratia marcescens plasmid pOU900 was transposed into the plasmid ColEl and into the plasmid RP4 in the absence of the RecA function of the host. In each case, the acquisition of fosfomycin resistance was correlated with the presence of a discrete piece of DNA, uniform in size and in restriction pattern. This new, 7.5-megadalton transposable e...

Tellurite reductase activity of nitrate reductase is responsible for the basal resistance of Escherichia coli to tellurite.

Tellurite and selenate reductase activities were identified in extracts of Escherichia coli. These activities were detected on non-denaturing polyacrylamide gels using an in situ methyl viologen activity-staining technique. The activity bands produced from membrane-protein extracts had the same RF values as those of nitrate reductases (NRs) A and Z. Tellurite and selenate reductase activities w...