Mammalian mitochondrial endonuclease activities specific for ultraviolet-irradiated DNA
Open Access
- 1 January 1990
- journal article
- research article
- Published by Oxford University Press (OUP) in Nucleic Acids Research
- Vol. 18 (4), 929-935
- https://doi.org/10.1093/nar/18.4.929
Abstract
Mitochondrial forms of uracll DNA glycosylase and UV endonuclease have been purified and characterized from the mouse plasmacytoma cell line, MPC-11. As in other cell types, the mitochondrial uracll DNA glycosylase has properties very similar to those of the nuclear enzyme, although in this case the mitochondrial activity was also distinguishable by extreme sensitivity to dilution. Three mitochondrial UV endonuclease activities are also similar to nuclear enzymes; however, the relative amounts of these enzyme activities in the mitochondria is significantly different from that in the nucieus. in particular, mitochondria contain a much higher proportion of an activity analogous to UV endonuclease III. Nuclear UV endonuclease III activity is absent from XP group D fibrobiasts and XP group D lymphoblasts have reduced, but detectable levels of the mitochondrial form of this enzyme. This residual activity diflers in its properties from the normal mitochondrial form of UV endonuclease III, however. The presence of these enzyme activities which function in base excision repair suggests that such DNA repair occurs in mttochondrla. Alternatively, these enzymes might act to mark damaged mitochondrial genomes for subsequent degradation.Keywords
This publication has 44 references indexed in Scilit:
- PURIFICATION AND CHARACTERIZATION OF 5-HYDROXYMETHYLURACIL-DNA GLYCOSYLASE FROM CALF THYMUS - ITS POSSIBLE ROLE IN THE MAINTENANCE OF METHYLATED CYTOSINE RESIDUES1989
- Antibody to a human DNA repair protein allows for cloning of a Drosophila cDNA that encodes an apurinic endonuclease.Molecular and Cellular Biology, 1989
- Purification and characterization of UV endonucleases I and II from murine plasmacytoma cellsJournal of Biological Chemistry, 1989
- Purification and properties of mitochondrial uracil-DNA glycosylase from rat liverBiochemistry, 1988
- Mitochondrial endonuclease activities specific for apurinic/apyrimidinic sites in DNA from mouse cells.Journal of Biological Chemistry, 1988
- Yeast redoxyendonuclease, a DNA repair enzyme similar to Escherichia coli endonuclease IIIBiochemistry, 1988
- Properties of a human lymphoblast AP-endonuclease associated with activity for DNA damaged by ultraviolet light, .gamma.-rays, or osmium tetroxideBiochemistry, 1983
- 5,6-Saturated thymine lesions in DNA: production by ultraviolet light or hydrogen peroxideNucleic Acids Research, 1982
- An Endonuclease from Mitochondria of Neurospora crassaJournal of Biological Chemistry, 1966
- PROTEIN MEASUREMENT WITH THE FOLIN PHENOL REAGENTJournal of Biological Chemistry, 1951