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Description of an Incompatibility Mutant of Escherichia coli

¹ Department of Microbiology, New York University School of Medicine, New York, New York 10016

ABSTRACT

A mutant Hfr strain of Escherichia coli which has an impaired incompatibility function but is normal for other F factor functions has been isolated. This Inc^– Hfr permits the maintenance and transfer of both the integrated F factor and an F' factor. F' factors have been isolated from the integrated F factor of the Inc^– Hfr strain. When these episomes were tested in matings with Hfr or F' strains, they did not differ in any observed way from wild-type F' factors.