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The use of an ethidium analogue in the dye-buoyant density procedure for the isolation of closed circular DNA: The variation of the superhelix density of mitochondrial DNA

Hudson, Bruce and Upholt, William B. and Devinny, Joseph and Vinograd, Jerome (1969) The use of an ethidium analogue in the dye-buoyant density procedure for the isolation of closed circular DNA: The variation of the superhelix density of mitochondrial DNA. Proceedings of the National Academy of Sciences of the United States of America, 62 (3). pp. 813-820. ISSN 0027-8424. http://resolver.caltech.edu/CaltechAUTHORS:HUDpnas69

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Abstract

The separation between open and closed circular DNA in buoyant CsCl gradients containing intercalating dyes depends on the superhelix density of the closed form. These separations are about 1.8 times larger with propidium iodide than with ethidium bromide. The superhelix densities of mitochondrial DNA from HeLa cells and Lytechinus pictus eggs appear to be about two thirds that of mitochondrial DNA from rat and rabbit liver.


Item Type:Article
Additional Information:© 1969 by the National Academy of Sciences. Read before the Academy October 29, 1968. It is a pleasure to thank T.I. Watkins and Boots Pure Drug Co., Ltd., for providing the ethidium analogues and the 3,8-dinitro-6-phenylphenanthridine, and L. Pikó for supplying the L. pictus M-DNA. We thank L. Wenzel and J. Edens for assistance in the culture of HeLa cells and J. Ceasar for assistance in the preparation of the manuscript. We also wish to thank Professor J. Hurwitz for generously providing advice and facilities to one of the authors (W.B.U.), who prepared the polynucleotide ligase while a guest at Albert Einstein Medical College, Bronx, New York. This work was supported by grants GM 15327-09 and CA 08014-04 from the U.S. Public Health Service and by fellowships (to B.H.) from the National Science Foundation and (to W.U.) from the U.S. Public Health Service. This is contribution no. 3743 from the Division of Chemistry, California Institute of Technology, Pasadena, California.
Record Number:CaltechAUTHORS:HUDpnas69
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:HUDpnas69
Alternative URL:http://www.pnas.org/cgi/content/abstract/62/3/813
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7256
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Jan 2007
Last Modified:14 Nov 2014 19:19

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