期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1983
卷号：80
期号：2
页码：574-578
DOI：10.1073/pnas.80.2.574
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：A model system has been developed to study the in vitro binding of a plasmid to the membrane fraction from Bacillus subtilis. The plasmid DNA molecule used in these studies was pSL103 (8.0 kilobases), a chimeric plasmid consisting of a Staphylococcus aureus plasmid (pUB110, 4.5 kilobases) and a DNA fragment (3.5 kilobases) from Bacillus pumilus carrying trpC+ gene. This plasmid replicates in B. subtilis cells, and its in vivo membrane binding (as well as its replication) is dependent on the product of a DNA initiation gene, dna-1, of B. subtilis. In this paper we demonstrate the in vitro specific binding of exogenous pSL103 to the isolated membrane fraction. This in vitro binding is specific to the origin-containing portion (pUB110) of pSL103. The trpC+-carrying portion neither binds to the membrane fraction nor competes with pSL103 for binding to the membrane fraction in vitro. ColE1 plasmid, which does not replicate in B. subtilis, neither binds to the B. subtilis membrane fraction nor competes with pSL103 for binding.
