pXO16 from Bacillus thuringiensis serovar israelensis: Almost 350 kb of terra incognita

Plasmid
Lionel MakartJacques Mahillon

Abstract

Bacillus thuringiensis strains usually harbor large sets of plasmids, some of which carrying the entomopathogenic δ-endotoxins. B. thuringiensis serovar israelensis, active on Dipteran larvae, carries the very large conjugative plasmid pXO16 (350 kb). pXO16 displays a macroscopic aggregation phenotype when liquid cultures of conjugative partners are mixed. Its conjugative apparatus is able of transferring itself and other non-conjugative and non-mobilizable plasmids in a fast and very efficient manner. Even though its conjugative kinetics and capabilities have been extensively studied, the genetic bases for this unique transfer system remain largely unknown. In this work, the sequence of pXO16 has been identified in the existing sequenced genome of B. thuringiensis sv. israelensis HD-789 as corresponding to the p01 plasmid. Despite pXO16 sequence being highly coding, few CDS possess homologs in the databases. However, potential regions responsible for the aggregation phenotype and the plasmid replication have been highlighted. The common orientation of all CDS and the presence of a high number of potential paralogs suggested a phage-like nature. Concerning conjugative functions, no significant type IV secretion system homologs ...Continue Reading

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Citations

Oct 30, 2016·Research in Microbiology·Annika GillisJacques Mahillon
Nov 5, 2016·Research in Microbiology·Alexandre BolotinAlexei Sorokin
Jun 27, 2018·Environmental Microbiology·Carlos Molina-Santiago
May 31, 2019·BMC Genomics·Nancy FayadJacques Mahillon
Sep 1, 2018·Nano Letters·Cécile FeuillieYves F Dufrêne

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