Abstract
Mitochondrial (mt) DNA from the unicellular, exsymbiotic Chlorella-like green alga, strain Nla was isolated and cloned. The mtDNA has a buoyant density of 1.692 g/ml in CsCl and an apparent G/C base composition of 32.5%. The genome contains approximately 76 kbp of DNA based on restriction fragment summation and electron microscopic measurements. A map of restriction endonuclease sites using Sst I, Bam I, Sal I and Xho I was generated. The genome maps as a circular molecule and appears as such under the electron microscope. Eight genes were assigned to the map by hybridization to specific restriction fragments using heterologous mt-encoded specific probes. These include the genes for subunits 6, 9, and alpha of the F0-F1 ATPase complex, the large and small subunit rRNAs, cytochrome oxidase subunits I and II, and apocytochrome b.
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