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Background   Bacillus cereus, Bacillus anthracis  and  Bacillus thuringiensis  belong to the genetically close-knit  Bacillus cereus sensu lato  group, a family of rod-shaped Gram-positive bacteria. pAW63 is the first conjugative plasmid from the  B. cereus  group to be completely sequenced.    Results  The 71,777 bp nucleotide sequence of pAW63 reveals a modular structure, including a 42 kb  tra  region encoding homologs of the Type IV secretion systems components VirB11, VirB4 and VirD4, as well as homologs of Gram-positive conjugation genes from  Enterococcus ,  Lactococcus ,  Listeria ,  Streptococcus  and  Staphylococcus  species. It also firmly establishes the existence of a common backbone between pAW63, pXO2 from  Bacillus anthracis  and pBT9727 from the pathogenic  Bacillus thuringiensis  serovar  konkukian  strain 97-27. The alignment of these three plasmids highlights the presence of well conserved segments, in contrast to distinct regions of high sequence plasticity. The study of their specific differences has provided a three-point reference framework that can be exploited to formulate solid hypotheses concerning the functionalities and the molecular evolution of these three closely related plasmids. This has provided insight into the chronology of their divergence, and led to the discovery of two Type II introns on pAW63, matching copies of the mobile element IS 231 L in different loci of pXO2 and pBT9727, and the identification on pXO2 of a 37 kb pathogenicity island (PAI) containing the anthrax capsule genes.    Conclusion  The complete sequence determination of pAW63 has led to a functional map of the plasmid yielding insights into its conjugative apparatus, which includes T4SS-like components, as well as its resemblance to other large plasmids of Gram-positive bacteria. Of particular interest is the extensive homology shared between pAW63 and pXO2, the second virulence plasmid of  B. anthracis , as well as pBT9727 from the pathogenic strain  B. thuringiensis  serovar  konkukian  strain 97-27.

bmc genomics

Conjugative plasmid pAW63 brings new insights into the genesis of the Bacillus anthracis virulence plasmid pXO2 and of the Bacillus thuringiensis plasmid pBT9727