Nucleic Acids Research, 1988, Vol. 16, No. 14 6427-6445
© 1988
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The preference of the mitochondrial endonuclease for a conserved sequence block in mitochondrial DNA is highly conserved during mammalian evolution
Departments of Pathology and Biological Chemistry, Washington University School of Medicine St Louis, MO 63110, USA
*To whom correspondence should be addressed
Received March 1, 1988. Endonuclease activity identified in crude preparations of rat and human-heart mitochondria has each been partially purified and characterized. Both the rat and human activities purify as a single enzyme that closely resembles the endonuclease of bovine-heart mitochondria (Cummings, O.W. et. al. (1987) J. Biol. Chem. 262:20052015). All three enzymes, for example elute similarly during gel filtration and DNA-cellulose chromatography, and exhibit similar enzymatic properties. Although the nucleotide sequences of the mtDNAs indicate that there has occurred an unusual degree of divergence in the displacement-loop region during mammalian evolution, the nucleotide specificities of the mt endonucleases appear highly conserved and show a striking preference for an evolutionarily-conserved sequence tract that is located up-stream from the heavy (H)-strand origin of DNA replication (OriH).
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