The inhibition of mitochondrial DNA polymerase gamma from animal cells by intercalating drugs.

Abstract:

:DNA polymerase gamma from purified nuclei of EMT-6 cells (mice) seems to be identical to the mitochondrial DNA polymerase from the same source following several criteria. These two enzyme activities are strongly inhibited by ethidium bromide and acriflavin, while proflavin, acridine orange, daunomycin and chloroquine inhibition is less pronounced. In the case of DNA polymerases alpha and beta very little inhibition by ethidium bromide was observed. Intercalation of this dye in a poly dA-dT 12-18 template-primer was studied spectrophotometrically under conditions similar to those in the in vitro DNA polymerase assay. The polymerase assay. The inhibition by this drug of the mitochondrial DNA polymerase gamma activity was shown to be competitive at varying concentrations of TTP while the inhibition was of the non-competitive type at different concentrations of poly dA-dT 12-18. We conclude that the drug, most probably in the intercalated form, is able to interact with the active site (s) of mitochondrial DNA polymerase.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Tarrago-Litvak L,Viratelle O,Darriet D,Dalibart R,Graves PV,Litvak S

doi

10.1093/nar/5.6.2197

subject

Has Abstract

pub_date

1978-06-01 00:00:00

pages

2197-210

issue

6

eissn

0305-1048

issn

1362-4962

journal_volume

5

pub_type

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