Plasmid maintenance in Bacillus stearothermophilus is strain-dependent

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We studied the segregational stability of plasmids based on pTB913, a 4.5-kb rolling-circle plasmid derived from the thermophilic Bacillus plasmid pTB19. In Bacillus stearothermophilus the stability of pTB913 derivatives appeared to be strain-dependent. In strain CU21 large amounts of single-stranded pTB913 DNA were found and the plasmid was highly unstable at 57°C. In strain NUB3621, however, very low amounts of single-stranded plasmid DNA were formed and pTB913-based replicons were only slightly unstable at 57°C. The NUB3621/pTB913 host-vector system seems appropriate for molecular cloning. A RepA-based replicon, also derived from pTB19 but replicating by a theta mechanism, was highly unstable in B. stearothermophilus NUB3621. © 1992.




Oskam, L., Venema, G., & Bron, S. (1992). Plasmid maintenance in Bacillus stearothermophilus is strain-dependent. FEMS Microbiology Letters, 93(3), 203–208.

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