Abstract
Mitochondrial DNA (mtDNA)-protein complexes (nucleoids) from Xenopus laevis oocytes were purified either on rate-zonal sucrose or isopyknic metrizamide gradients. From electron microscopic studies and staphylococcal nuclease digestion experiments mtDNA appears to be packaged into regular beaded structures. Protein electrophoretic analysis and M banding results show that mtDNA is associated with the membrane structures and also with few specific proteins including one acid-soluble polypeptide of 28 kD.
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