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Oxidative stress regulates the interaction of p16 with Cdk4
E A Martin1, P J Robinson, R A Franklin
1Department of Microbiology and Immunology, Leo Jenkins Cancer Center, Greenville, North Carolina 27858, USA.
Abstract:
Oxidative stress can have a myriad of effects on many different cell types. The mechanisms by which these effects occur are not completely known. Chimeric proteins of the GAL4 DNA binding domain and Cdk4, or the GAL4 activation domain with p16, were expressed in the yeast two-hybrid system. Cells expressing these chimeric proteins were cultured with hydrogen peroxide and decreases in beta-galactosidase activity were observed when compared to cells incubated without hydrogen peroxide. When cells, which expressed the intact GAL4 binding protein, were cultured in the presence of hydrogen peroxide the opposite was observed. Incubation of cells with buthionine sulfoximine augmented these responses to hydrogen peroxide. These data suggest that one of the mechanisms by which oxidative stress acts is via the modulation of protein-protein interactions and demonstrate that the yeast two-hybrid system may be a model by which to study protein interactions due to oxidative stress.
Insights
Oxidative stress impacts cell function by altering protein interactions. The yeast two-hybrid system can model how oxidative stress affects these crucial cellular connections.
Area of Science:
- Molecular biology
- Cellular biology
- Biochemistry
Background:
- Oxidative stress exerts diverse effects on various cell types, but the underlying mechanisms remain incompletely understood.
- Understanding how oxidative stress influences cellular processes is critical for deciphering its role in health and disease.
Purpose of the Study:
- To investigate the mechanisms by which oxidative stress affects cellular functions.
- To explore the potential of the yeast two-hybrid system as a model for studying oxidative stress-induced alterations in protein-protein interactions.
Main Methods:
- Expression of chimeric proteins involving GAL4 DNA binding domain with Cdk4, and GAL4 activation domain with p16 in the yeast two-hybrid system.
- Exposure of yeast cells expressing these chimeric proteins to hydrogen peroxide and buthionine sulfoximine.
- Measurement of beta-galactosidase activity as an indicator of protein-protein interactions.
Main Results:
- Hydrogen peroxide exposure led to decreased beta-galactosidase activity in cells expressing specific chimeric proteins, indicating altered protein interactions.
- Cells expressing the intact GAL4 binding protein showed an opposite response to hydrogen peroxide.
- Incubation with buthionine sulfoximine enhanced the observed responses to hydrogen peroxide.
Conclusions:
- Oxidative stress modulates protein-protein interactions, suggesting this as a key mechanism of its cellular effects.
- The yeast two-hybrid system serves as a viable model for studying the impact of oxidative stress on protein interactions.