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Functionality of Tn916 in Paenibacillus larvae

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Abstract

The conjugative transposon Tn916 was determined to be functional in Paenibacillus larvae in regard to expression of tetracycline resistance and conjugative transfer. Expression of erythromycin resistance, using Tn916ΔE, was also observed. Conjugative transfer experiments employing Paenibacillus popilliae strains Tc1001 and Em1001 as transposon donors and experiments using different P. larvae subspecies or different transposon-containing strains demonstrated interspecies and intraspecies transfer occurred for Tn916 and Tn916ΔE. Southern hybridization analysis of several Tn916-containing P. larvae isolates showed that the transposon randomly inserted into the bacterial chromosome with an indication that hot spot insertion had occurred. Hybridization analysis indicated single-copy insertion of Tn916 into the genome predominated. However, selection of multiple-resistant isolates (i.e., isolates containing Tn916 and Tn916ΔE) demonstrated that multiple copies of the transposon could coexist in the bacterial genome. Growth of transposon-containing isolates in broth medium in the absence of selective antibiotic pressure showed that Tn916 and Tn916ΔE were stably maintained in the bacterium.

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Acknowledgements

I thank N. P. Schultes and Regan Huntley for technical assistance. This research was supported by Federal Hatch fund USDA CONH00254.

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  1. Department of Entomology, Connecticut Agricultural Experiment Station, 123 Huntington Street, P.O. Box 1106, New Haven, CT, 06504, USA

    Douglas W. Dingman

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  1. Douglas W. Dingman
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Correspondence to Douglas W. Dingman.

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Communicated by Erko Stackebrandt.

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Dingman, D.W. Functionality of Tn916 in Paenibacillus larvae . Arch Microbiol 199, 487–493 (2017). https://doi.org/10.1007/s00203-016-1321-6

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