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Mutually exclusive distribution of the sap and eag S-layer genes and the lytB/lytA cell wall hydrolase genes in Bacillus thuringiensis

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Abstract

Recently, two Bacillus thuringiensis strains were reported to synthesize parasporal inclusion bodies made not of the expected crystal (Cry) proteins but rather of the surface layer proteins (SLP) Sap (encoded by sap) and EA1 (encoded by eag), respectively. Whether the presence of the sap and eag genes is restricted to these two B. thuringiensis strains or ubiquitous in B. thuringiensis is unknown. We report here the distribution of the sap and eag genes in B. thuringiensis. Strains in the Bacillus cereus group were added for comparison purposes. We show that sap and eag are either present in tandem in 35% of the B. thuringiensis strains analysed and absent in 65% of the strains. When absent, a different tandem, the lytB/lytA cell wall hydrolase genes, is present. The distribution of the sap and eag S-layer and the lytB/lytA cell wall hydrolase genes is not species-specific in B. thuringiensis, B. cereus and Bacillus weihenstephanensis. Bacillus anthracis and Bacillus mycoides harbor sap and eag but not lytB/lytA. The sap, eag and lytB/lytA genes were absent in Bacillus pseudomycoides. Clearly, the distribution of the sap and eag S-layer and the lytB/lytA cell wall hydrolase genes in B. thuringiensis and in the Bacillus cereus group is mutually exclusive. We also showed that two genes involved in cell wall metabolism, csaA and csaB, are present not only upstream of the sap and eag S-layer genes, but also upstream of the lytB/lytA tandem in strains where sap and eag are absent. Bootstrapped neighbor-joining trees were inferred from the translated amino acid sequences of sap, eag and the tandem lytB/lytA, respectively.

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Authors and Affiliations

  1. Agriculture and Agri-Food Canada, Research and Development Centre, 430 Gouin Blvd, Saint-Jean-sur-Richelieu, QC, J3B 3E6, Canada

    Brahim Soufiane & Jean-Charles Côté

  2. Département de Chimie-Biologie, Université du Québec à Trois-Rivières, 3351 Boul. des Forges, P.O. Box 500, Trois-Rivières, QC, G9A 5H7, Canada

    Brahim Soufiane & Marc Sirois

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  1. Brahim Soufiane
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Correspondence to Jean-Charles Côté.

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Soufiane, B., Sirois, M. & Côté, JC. Mutually exclusive distribution of the sap and eag S-layer genes and the lytB/lytA cell wall hydrolase genes in Bacillus thuringiensis . Antonie van Leeuwenhoek 100, 349–364 (2011). https://doi.org/10.1007/s10482-011-9590-1

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