DNA repair protein XRCC4

File:Interaction of XRCC4 in NHEJ.jpg

Interaction of XRCC4 in NHEJ

DNA repair protein XRCC4 is a crucial component in the DNA repair process, specifically involved in the non-homologous end joining (NHEJ) pathway, which is essential for the repair of double-strand breaks in DNA.

Function

XRCC4 is a scaffold protein that interacts with DNA ligase IV and XLF (XRCC4-like factor) to facilitate the ligation of broken DNA ends. This protein is vital for maintaining genomic stability and preventing genomic instability that can lead to cancer.

Structure

The XRCC4 protein forms a complex with DNA ligase IV, and this complex is stabilized by interactions with XLF. The XRCC4-DNA ligase IV complex is responsible for the final step in the NHEJ pathway, which is the ligation of the DNA ends.

Clinical Significance

Mutations in the XRCC4 gene can lead to immunodeficiency and increased sensitivity to ionizing radiation. Defects in the NHEJ pathway, where XRCC4 plays a critical role, are associated with various genetic disorders and cancer predisposition syndromes.

Research

Studies on XRCC4 have provided insights into the mechanisms of DNA repair and the importance of this protein in protecting against genomic damage. Research continues to explore the potential of targeting XRCC4 and the NHEJ pathway in cancer therapy.

See Also

• DNA repair
• Non-homologous end joining
• DNA ligase IV
• Genomic stability

External Links

• XRCC4 Gene - NCBI
• XRCC4 Protein - UniProt