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Genetic and physical analysis of plasmid genes expressing inducible resistance of tellurite in Escherichia coli

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Summary

A large (>250 kb) conjugative plasmid, pMER610, specifying resistance to tellurium and mercury was isolated from an Alcaligenes strain and transferred by conjugation to Escherichia coli AB1157. The acquisition of pMER610 by AB1157 increased the resistance to both tellurite and tellurate by 100-fold. Expression of tellurite resistance by pMER610 and the cloned Ter determinant was inducible by prior exposure to tellurite at levels sub-toxic to the sesitive AB1157. Physical analysis of the cloned Ter fragment located the resistance determinant to a 3.55 kb region. Insertion of Tn 1000 (γδ) into this region produced two classes of sensitive mutations, fully sensitive and intermediate or hyposensitive, which map in adjacent regions and form two complementation groups. Maxicell analysis identified four polypeptides (15.5, 22, 23 and 41 kDa) expressed by the Ter clone. The 23 kDa polypeptide may not be required for resistance since tellurium-sensitive γδ insertion mutations were not detected in the 23 kDa coding region.

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Authors and Affiliations

  1. Department of Genetics, University of Liverpool, L69 3BX, Liverpool, UK

    M. G. Jobling & D. A. Ritchie

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  1. M. G. Jobling
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  2. D. A. Ritchie
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Communicated by P. Starlinger

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Jobling, M.G., Ritchie, D.A. Genetic and physical analysis of plasmid genes expressing inducible resistance of tellurite in Escherichia coli . Mole Gen Genet 208, 288–293 (1987). https://doi.org/10.1007/BF00330455

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  • DOI: https://doi.org/10.1007/BF00330455

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