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Fatty acids selectively inhibit eukaryotic DNA polymerase activities in vitro
Y Mizushina1, N Tanaka, H Yagi
1Department of Applied Biological Science, Faculty of Science and Technology, Science University of Tokyo, Chiba-ken, Japan.
Biochimica Et Biophysica Acta
|September 11, 1996
Summary
Certain fatty acids inhibit eukaryotic DNA polymerases alpha and beta in vitro. Linoleic acid
Area of Science:
- Biochemistry
- Molecular Biology
Background:
- Eukaryotic DNA polymerases are crucial for DNA replication and repair.
- The interaction between DNA polymerases and fatty acids is not well understood.
Purpose of the Study:
- To investigate the in vitro relationship between eukaryotic DNA polymerases and fatty acids.
- To determine the inhibitory effects of specific fatty acids on DNA polymerase activity.
Main Methods:
- In vitro assays were performed to measure the activity of purified DNA polymerase alpha and beta.
- Various fatty acids, including linoleic acid, were tested for their inhibitory effects.
- Enzyme kinetics studies were conducted to elucidate the mechanism of inhibition.
Main Results:
- Several fatty acids demonstrated significant inhibition of DNA polymerase alpha and/or beta activity in vitro.
- Linoleic acid exhibited non-competitive inhibition against DNA polymerase alpha concerning the DNA template and dTTP substrate.
- Linoleic acid displayed competitive inhibition against DNA polymerase beta with respect to both DNA and substrate.
Conclusions:
- Fatty acids can modulate the activity of eukaryotic DNA polymerases.
- The specific mechanisms of inhibition vary between DNA polymerase alpha and beta, as exemplified by linoleic acid.
- These findings suggest a potential role for fatty acids in regulating DNA replication and repair processes.