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Distribution of 2-kb miniplasmid pBMB2062 from Bacillus thuringiensis kurstaki YBT-1520 strain in Bacillus species

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Abstract

A multi-copy and small plasmid pBMB2062 from Bacillus thuringiensis kurstaki YBT-1520 strain was cloned and characterized and its distribution was analyzed using dot-blot analysis with the ORF1 fragment as a probe. Bacillus species of 84 serotypes were evaluated. The pBMB2062 plasmid was found to be present in commercial B. thuringiensis kurstaki (H3abc) and aizawai (H7) insecticides of various serotypes, and one Bacillus cereus UW85 strain (produced Zwittermicin fungicide and Cry toxin synergist). The sequences of 7 pBMB2062-like plasmids from randomly selected Bacillus species (positive signal in the dot-blot analysis) were highly conserved. Two open reading frames (ORFs), ORF1 and ORF2, were present in this plasmid. ORF1 was found to be necessary for plasmid replication, whereas ORF2 did not play a role in replication or stability. Based on its sequence homology, ORF2 was a putative solitary antitoxin. Furthermore, the copy number of the replicon of pBMB2062 was higher than those of ori1030 and ori44 based on the thermogenic data, and ori2062 could drive the stable replication of a recombinant plasmid (11 kb total size) in B. thuringiensis.

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Acknowledgments

We thank Professor Jacques Mahillon (Catholic University of Louvain) for his personal communication on the TA system. We thank Mr. Yu Yao (Shanghai Jiaotong University) for his valuable help on article writing. We thank Dan Zeigler (Bacillus Genetics Stock Centers) and Jean-François Charles (Pasteur Institute) for providing the B. thuringiensis strains. This work was supported by grants from the National High Technology Research and Development Program (863) of China (2011AA10A203), China 948 Program of Ministry of Agriculture (2011-G25), the National Basic Research Program (973) of China (2009CB118902) and the National Natural Science Foundation of China (31170047 and 31000020).

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Correspondence to Ming Sun.

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Liu, XJ., Ruan, LF., Lin, XY. et al. Distribution of 2-kb miniplasmid pBMB2062 from Bacillus thuringiensis kurstaki YBT-1520 strain in Bacillus species. Ann Microbiol 63, 1639–1644 (2013). https://doi.org/10.1007/s13213-013-0627-8

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  • DOI: https://doi.org/10.1007/s13213-013-0627-8

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