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Mitochondrial (mt) DNA of the higher basidiomycetes Lentinus edodes with a molecular weight of about 69 kb was partially digested with Sau3AI, cloned with plasmid YIp32 (a hybrid of pBR322 and the yeast leu2 gene) and analyzed for sequences capable of autonomous replication (ARSs) in the eukaryote Saccharomyces cerevisiae. One recombinant plasmid was isolated which contained 3.2 kb fragment of the mtDNA with ARS activity. This plasmid (named pSK52) exhibited a high-frequency yeast transformation and was found to be maintained within the cell as an extrachromosomal element. The stability and copy number properties of pSK52 were similar to those of the recombinant plasmid of YIp32 and S. cerevisiae mt-ARS constructed as a reference. Subcloning experiments were carried out to assess the localization of ARS on the above 3.2 kb fragment, revealing that the fragment contains at least two ARSs.
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