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jcb Home » 1971 Archive » 1 October » 51 (1): 116
Article

THE EFFECT OF ETHIDIUM BROMIDE ON MITOCHONDRIAL DNA SYNTHESIS AND MITOCHONDRIAL DNA STRUCTURE IN HELA CELLS

Robert D. Leibowitz
Robert D. Leibowitz
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DOI: 10.1083/jcb.51.1.116 | Published October 1, 1971
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Abstract

The synthesis of mitochondrial DNA (mDNA) in HeLa cells is selectively inhibited by relatively low concentrations of ethidium bromide. After exposure of cells to strongly inhibitory concentrations of the drug, the apparent superhelix density of mDNA is rapidly increased, as judged by its buoyant density in CsCl in the presence of ethidium bromide. Mitochondrial DNA synthesized in the presence of partially inhibitory concentrations of ethidium bromide is also altered in its buoyant density in the presence of the dye, but is more heterogeneous in this respect. However, the change in buoyant density of newly synthesized mDNA may be explained by changes in structure other than a change in superhelix density, as indicated by its increased resistance to digestion by pancreatic DNase.

Footnotes

    • Submitted: 15 January 1971
    • Revision received 24 March 1971
© 1971 Rockefeller University Press
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THE EFFECT OF ETHIDIUM BROMIDE ON MITOCHONDRIAL DNA SYNTHESIS AND MITOCHONDRIAL DNA STRUCTURE IN HELA CELLS
Robert D. Leibowitz
The Journal of Cell Biology Oct 1971, 51 (1) 116-122; DOI: 10.1083/jcb.51.1.116

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The Journal of Cell Biology: 218 (2)

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February 4, 2019
Volume 218, No. 2

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