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. 1983 Jun;154(3):1184–1194. doi: 10.1128/jb.154.3.1184-1194.1983

Site-specific in vitro binding of plasmid pUB110 to Bacillus subtilis membrane fraction.

T Tanaka, N Sueoka
PMCID: PMC217590  PMID: 6406425

Abstract

The in vitro membrane binding of pSL103, a composite plasmid consisting of Staphylococcus aureus plasmid pUB110 and a Bacillus pumilus trpC+ DNA fragment, to the Bacillus subtilis membrane fraction was studied with a total lysate of B. subtilis cells. The binding reaction required a heat treatment at 45 degrees C and had an optimum KCl concentration of 60 mM. Nonradioactive pSL103, but not Escherichia coli plasmid pACYC184, competed with 3H-labeled pSL103 for binding to the membrane. By the use of 32P-labeled restriction fragments of pSL103 and pUB110, it has been found that only the pUB110 portion of pSL103 binds to the membrane and that there are four specific regions in pUB110 which bind to the membrane. Two of the four binding regions flank the replication origin. This in vitro binding was high-salt sensitive and apparently independent of the configurations of the plasmid. We have previously shown that the functional product of the initiation gene dna-1 is required in vivo both for replication initiation and the binding of a DNA region near the replication origin to the membrane. Unlike in vivo binding, which is high-salt resistant and dependent on the product of dna-1 gene (type-I binding), the in vitro binding reported in this paper was high-salt sensitive and independent of the dna-1 gene product (type-II binding).

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Selected References

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