DNA-protein cross-link repair: what do we know now?

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• DNA-protein cross-links (DPCs) are common DNA adducts formed by endogenous or exogenous agents.
• DPCs impede essential DNA processes like replication and transcription.
• Understanding DPC formation and repair is crucial for cellular health and disease.

Purpose of the Study:

• To review and summarize the current knowledge on DNA-protein cross-link repair pathways.
• To highlight the mechanisms of different DPC repair pathways, including novel ones.
• To explore the therapeutic potential of targeting DPC repair in cancer treatment.

Main Methods:

• Literature review of studies on DNA-protein cross-link repair.
• Analysis of known DPC repair pathways: nucleotide excision repair, homologous recombination, tyrosyl-DNA phosphodiesterases, and proteolysis.
• Comparative analysis of enzyme functions in DPC resolution.

Main Results:

• Multiple pathways exist for DPC repair, targeting DNA, protein, or the cross-link itself.
• Nuclease-dependent pathways (NER, HR) and direct reversal enzymes (TDPs) are established repair mechanisms.
• Proteolysis pathways involving Wss1 and SPRTN offer a novel mechanism for direct protein hydrolysis in DPCs.

Conclusions:

• Cells utilize diverse pathways to efficiently repair DNA-protein cross-links.
• The interplay between these repair pathways is critical for maintaining genome stability.
• Targeting DPC repair mechanisms presents a promising therapeutic strategy for cancer treatment.