The strain Pseudomonas putida BS3701 was isolated from soil contaminated with coke by-product waste (Moscow Region, Russian Federation). It is capable of degrading crude oil and polycyclic aromatic hydrocarbons (PAHs). The P. putida BS3701 genome consists of a 6,337,358-bp circular chromosome and two circular plasmids (pBS1141 with 107,388 bp and pBS1142 with 54,501 bp).

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In current study plasmids (size from 6.2 to 8.5 kb) copied with the “rolling circle” mechanism (RCR type) of the pC194 family have been identified in environmental bacteria Bacillus pumilus. It is shown that these extrachromosomal elements are widely distributed in B. pumilus bacteria circulating on the territory of Belarus (19 strains from 41 contain RCRplasmids) and they are characterized by genetic polymorphism. The most common extrachromosomal genetic elements (7.7 kb size) are identical to the plasmid pBp15.1S from the entomopathogenic strain B. pumilus 15.1. The remaining 6 type of plasmids differ from each other and from the known extrachromosomal genetic elements of genus Bacillus. In the investigated bacteria no replicons similar to pLS20 were detected.

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