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Characterization of Three Plasmid Deoxyribonucleic Acid Molecules in a Strain of Streptococcus faecalis: Identification of a Plasmid Determining Erythromycin Resistance

¹ Dental Research Institute, Departments of Oral Biology and Microbiology, Schools of Dentistry and Medicine, The University of Michigan, Ann Arbor, Michigan 48104

ABSTRACT

Three plasmids designated , ß, and , distinguishable by their molecular weights (6, 17, and 34 million, respectively) were isolated from Streptococcus faecalis strain DS-5 (ATCC 14508). Derivatives of this strain "cured" for erythromycin resistance lacked the ß-plasmid. In the parent strain the ß-plasmid was estimated to be present to the extent of one to two copies per chromosomal genome equivalent whereas the - and -plasmids were about nine and five copies, respectively.

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