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Nucleic Acids Research, 1987, Vol. 15, No. 3 1097-1107
© 1987

Articles

A new type of plasmid from a wild isolate of Dictyostelium species: the existence of closely situated long inverted repeats

Hidefumi Orii, Kazuyoshi Suzuki, Yoshimasa Tanaka* and Kaichiro Yanagisawa

Institute of Biological Sciences, University of Tsukuba Sakura-mura, Ibaraki 305, Japan

*To whom correspondence should be addressed

Received July 29, 1986. Revised December 29, 1986. Accepted January 5, 1987.

A circular plasmid having high copy number was found in a wild isolate of Dictyostelium species. Gel electrophoresis, electron microscopy and Southern blot hybridization revealed that the plasmid, named pDG1, is 4.5Kb(1.5µm) in size with closely situated long inverted repeats. The plasmid seems to be located in the nuclei. It was not a derivative of ribosomal DNA. The possible correlation of the plasmid with the putative intermediate DNA of retro-transposon DIRS-1 found in Dictyostelium discoideum is discussed.


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