Mouse Rev1 protein interacts with multiple DNA polymerases involved in translesion DNA synthesis

Area of Science:

• Molecular Biology
• Biochemistry
• Genetics

Background:

• DNA polymerases are crucial for DNA replication and repair.
• Translesion DNA synthesis (TLS) allows cells to replicate damaged DNA.
• Y-family polymerases, including Rev1, Pol kappa, Pol iota, and Pol eta, are key players in TLS.

Purpose of the Study:

• To investigate the physical interactions between mouse Rev1 and other Y-family DNA polymerases.
• To determine the binding sites and functional consequences of these interactions.
• To elucidate the role of Rev1 in mediating protein-protein interactions within TLS pathways.

Main Methods:

• Co-immunoprecipitation assays to demonstrate physical association between Rev1 and Pol kappa.
• Yeast three-hybrid assays to map protein-protein interaction domains.
• In vitro primer extension assays to assess DNA polymerase activity.

Main Results:

• Mouse Rev1 physically associates with Pol kappa.
• Rev1 interacts independently with Rev7, Pol iota, and Pol eta.
• All tested polymerases bind to the same C-terminal region of Rev1, with Rev7 competing for Pol kappa binding.
• The physical interactions do not alter the DNA polymerase activity of the individual enzymes.

Conclusions:

• Rev1 acts as a scaffold protein, mediating protein-protein interactions among Y-family DNA polymerases.
• These interactions are likely important for coordinating TLS.
• The precise functional role of these protein complexes in TLS requires further investigation.