Protein-Protein Interactions in DNA Base Excision Repair

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Base excision repair (BER) is crucial for correcting abundant DNA damages in mammalian cells, maintaining genome stability.
• Efficient BER relies on the coordinated action of enzymes and protein factors in a multistage process.
• Coordination mechanisms involve protein complexes stabilized by direct or DNA-mediated interactions.

Purpose of the Study:

• This review outlines investigations into direct protein-protein interactions within the BER pathway.
• It presents known protein partners, interaction sites, and affinity characteristics for key BER participants.
• The review also discusses regulatory mechanisms of protein interactions, including DNA intermediates and posttranslational modifications.

Main Methods:

• The review synthesizes findings from studies investigating direct protein-protein interactions in BER.
• It compiles data on protein partners, interaction sites, and quantitative affinity characteristics.
• Information on regulatory mechanisms, including DNA-mediated interactions and posttranslational modifications, is presented.

Main Results:

• Direct interactions between BER proteins and other cellular proteins are detailed.
• Key protein partners and their interaction sites for main BER participants are identified.
• Quantitative affinity data for these interactions are provided.

Conclusions:

• Multiprotein complexes are suggested to form on chromatin, independent of DNA damage, facilitated by XRCC1 and PARP1.
• These complexes dynamically change composition based on DNA damage type and BER stage.
• XRCC1 and poly(ADP-ribose) polymerase 1 (PARP1) act as key regulators, scaffolding these dynamic complexes.