Abstract
Osmotically shocked spheroplasts from Saccharomyces cerevisiae incorporated deoxynucleoside triphosphates specifically into double-stranded nuclear and mitochondrial deoxyribonucleic acid (DNA). Results with this in vitro system for cells with and without mitochondrial DNA were compared. Strains lacking mitochondrial DNA were used to study nuclear DNA replication. With a temperature-sensitive mutant defective in DNA replication in vivo, DNA synthesis in vitro was temperature sensitive as well. The product of synthesis with all strains after very short labeling times consisted principally of short fragments that sedimented at approximately 4S in alkali; with longer pulse times or a chase with unlabeled nucleotides, they grew to a more heterogenous size, with an average of 6 to 8S and a maximum of 15S. There was little, if any, integration of these DNA fragments into the high-molecular-weight nuclear DNA. Analysis by CsCl density gradient centrifugation after incorporation of bromodeoxyuridine triphosphate showed that most of the product consisted of chains containing both preexisting and newly synthesized material, but there was also a small fraction (ca. 20%) in which the strands were fully synthesized in vitro. 32P-label transfer (“nearest-neighbor”) experiments demonstrated that at least a part of the material synthesized in vitro contained ribonucleic acid-DNA junctions. DNA pulse-labeled in vivo in a mutant capable of taking up thymidine 5′-monophosphate, sedimented in alkali at 4S, as in the case of the in vitro experiments.
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Selected References
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