a nuclear protein involved in homologous recombination, telomere length maintenance, and DNA double-strand break repair. By itself, the protein has 3' to 5' exonuclease activity and endonuclease activity. The protein forms a complex with the RAD50 homolog; this complex is required for nonhomologous joining of DNA ends and possesses increased single-stranded DNA endonuclease and 3' to 5' exonuclease activities. In conjunction with a DNA ligase, this protein promotes the joining of noncomplementary ends in vitro using short homologies near the ends of the DNA fragments. Alternative splicing results in two different isoforms. Note: This description may include information from UniProtKB.
Protein type: Deoxyribonuclease; Cell cycle regulation; DNA repair, damage; DNA-binding
Molecular Function: 3'-5' exonuclease activity; ATP-dependent DNA helicase activity; DNA binding; double-stranded DNA binding; endodeoxyribonuclease activity; nuclease activity; protein binding; protein C-terminus binding; single-stranded DNA specific endodeoxyribonuclease activity
Biological Process: DNA double-strand break processing; DNA duplex unwinding; DNA recombination; DNA repair; DNA replication; DNA synthesis during DNA repair; double-strand break repair; double-strand break repair via homologous recombination; double-strand break repair via nonhomologous end joining; intra-S DNA damage checkpoint; meiotic recombination; negative regulation of apoptosis; negative regulation of DNA endoreduplication; positive regulation of interferon type I production; positive regulation of kinase activity; positive regulation of protein amino acid autophosphorylation; positive regulation of telomere maintenance; regulation of mitotic recombination; response to DNA damage stimulus; sister chromatid cohesion; strand displacement; telomere maintenance via telomerase; telomeric 3' overhang formation
LTP: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.