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Nucleic Acids Research, 1982, Vol. 10, No. 5 1439-1458
© 1982

MOLECULAR BIOLOGY

Characterization of two new plasmid DNAs found in mitochondria of wild-type Neurospora intermedia strains

Lori L. Stohl, Richard A. Collins, Michael D. Cole and Alan M. Lambowitz

The Edward A.Doisy Department of Biochemistry, St. Louis University School of Medicine St. Louis, MO 63104, USA

Received January 18, 1982. Accepted January 29, 1982.

Mitochondria from two Neurospora intermedia strains (P405-Labelle and Fiji N6-6) were found to contain plasmid DNAs in addition to the standard mitochondrial DNA species. The plasmid DNAs consist of monomeric circles (4.1–4.3 kbp and 5.2–5.3 kbp for Labelle and Fiji, respectively) and oligomers in which monomers are organized as head-to-tail repeats. DNA-DNA hybridization experiments showed that the plasmids have no substantial sequence homology to mtDNA, to each other, or to a previously characterized mitochondrial plasmid from N. crassa strain Mauriceville-lc (Collins et al. Cell 24, 443–452, 1981). The intramitochondrial location of the plasmids was established by cell fractionation and nuclease protection experiments. In sexual crosses, the plasmids showed strict maternal inheritance, the same as Neurospora mitochondrial DNA. The plasmids may represent a novel class of mitochondrial genetic elements.


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