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Bacillus thuringiensis  and  Bacillus endophyticus  both act as the companion bacteria, which cooperate with  Ketogulonigenium vulgare  in vitamin C two-step fermentation. Two  Bacillus  species have different morphologies, swarming motility and 2-keto-L-gulonic acid productivities when they co-culture with  K. vulgare . Here, we report the complete genome sequencing of  B. thuringiensis  Bc601 and eight plasmids of  B. endophyticus  Hbe603, and carry out the comparative genomics analysis. Consequently,  B. thuringiensis  Bc601, with greater ability of response to the external environment, has been found more two-component system, sporulation coat and peptidoglycan biosynthesis related proteins than  B. endophyticus  Hbe603, and  B. endophyticus  Hbe603, with greater ability of nutrients biosynthesis, has been found more alpha-galactosidase, propanoate, glutathione and inositol phosphate metabolism, and amino acid degradation related proteins than  B. thuringiensis  Bc601. Different ability of swarming motility, response to the external environment and nutrients biosynthesis may reflect different companion mechanisms of two  Bacillus  species. Comparative genomic analysis of  B. endophyticus  and  B. thuringiensis  enables us to further understand the cooperative mechanism with  K. vulgare , and facilitate the optimization of bacterial consortium.

Comparative genomics analysis of the companion mechanisms of Bacillus thuringiensis Bc601 and Bacillus endophyticus Hbe603 in bacterial consortium