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. 1996 Nov;62(11):3948–3953. doi: 10.1128/aem.62.11.3948-3953.1996

Direct selection of cloned DNA in Bacillus subtilis based on sucrose-induced lethality.

M G Bramucci 1, V Nagarajan 1
PMCID: PMC168212  PMID: 8899981

Abstract

Expression of the Bacillus subtilis or Bacillus amyloliquefaciens sacB gene in the presence of sucrose is lethal for a variety of bacteria. Sucrose-induced lethality can be used to select for inactivation of sacB by insertion of heterologous DNA in sensitive bacteria. This procedure has not been applicable to B. subtilis heretofore because expression of wild-type sacB is not detrimental to B. subtilis. The W29 mutation in the B. amyloliquefaciens sacB gene interferes with processing of the levansucrase signal peptide. The W29 mutation does not affect growth of B. subtilis in media lacking sucrose. However, this mutation inhibited growth of B. subtilis in media containing sucrose. Inactivation of the fructose polymerase activity encoded by sacB indicated that levan production was essential for sucrose-induced lethality. As a result, it was possible to select for cloned DNA in B. subtilis by insertional inactivation of the mutant sacB gene located on a multicopy plasmid vector in medium containing sucrose.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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