Biomaterial Database

[The role of Ku antigen in the repair of apurinic/apyrimidinic sites in DNA]. 2015

A A Kosova, and O I Lavrik, and S N Hodyreva

Apurinic/apyrimidinic (AP) sites are some of the most frequent lesions in genomic DNA. It is widely accepted that, irrespective of their origin, AP sites are further processed by the base excision repair (BER) machinery, being the central intermediate of this process. Under special conditions, proteins, which recognize AP sites, are able to form covalent adducts with DNA. By combination of the cross-linking technique with mass-spectrometry analysis, Ku antigen (Ku)--the central player in nonhomologous end joining (NHEJ), the pathway of double-strand break (DSB) repair--was identified as a protein reactive to AP sites. Moreover, Ku was shown to be a 5'-dRP/AP lyase that acts near DSBs in NHEJ. The recent studies have demonstrated involvement of Ku in the different stages of BER. Here, Ku roles in NHEJ and BER pathways of DNA repair are overviewed.

UI	MeSH Term	Description	Entries
D011119	Polynucleotides	BIOPOLYMERS composed of NUCLEOTIDES covalently bonded in a chain. The most common examples are DNA and RNA chains.	Polynucleotide
D004260	DNA Repair	The removal of DNA LESIONS and/or restoration of intact DNA strands without BASE PAIR MISMATCHES, intrastrand or interstrand crosslinks, or discontinuities in the DNA sugar-phosphate backbones.	DNA Damage Response
D004268	DNA-Binding Proteins	Proteins which bind to DNA. The family includes proteins which bind to both double- and single-stranded DNA and also includes specific DNA binding proteins in serum which can be used as markers for malignant diseases.	DNA Helix Destabilizing Proteins,DNA-Binding Protein,Single-Stranded DNA Binding Proteins,DNA Binding Protein,DNA Single-Stranded Binding Protein,SS DNA BP,Single-Stranded DNA-Binding Protein,Binding Protein, DNA,DNA Binding Proteins,DNA Single Stranded Binding Protein,DNA-Binding Protein, Single-Stranded,Protein, DNA-Binding,Single Stranded DNA Binding Protein,Single Stranded DNA Binding Proteins
D000072200	Ku Autoantigen	An ATP-dependent DNA HELICASE that preferentially binds SINGLE-STRANDED DNA. It is a heterodimer consisting of an 80 kDa subunit (XRCC5) and 70 kDa subunit (XRCC6) that functions with DNA LIGASE IV in the repair of DOUBLE-STRANDED DNA BREAKS and V(D)J RECOMBINATION.	G22P1 Antigen,Ku Antigen,Ku Autoantigen, 70 kDa,Ku Autoantigen, 80 kDa,Ku Heterodimer,Ku Protein,Ku70 Antigen,Ku80 Antigen,X-ray Repair Cross-Complementing Protein 5,X-ray Repair Cross-Complementing Protein 6,XRCC5 Protein,XRCC6 Protein,Antigen, G22P1,Antigen, Ku,Antigen, Ku70,Antigen, Ku80,Autoantigen, Ku,Heterodimer, Ku,X ray Repair Cross Complementing Protein 5,X ray Repair Cross Complementing Protein 6
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D001080	Apurinic Acid	Hydrolysate of DNA in which purine bases have been removed.	Acid, Apurinic
D046912	Multiprotein Complexes	Macromolecular complexes formed from the association of defined protein subunits.	Macromolecular Protein Complexes,Complexes, Macromolecular Protein,Complexes, Multiprotein,Protein Complexes, Macromolecular
D051379	Mice	The common name for the genus Mus.	Mice, House,Mus,Mus musculus,Mice, Laboratory,Mouse,Mouse, House,Mouse, Laboratory,Mouse, Swiss,Mus domesticus,Mus musculus domesticus,Swiss Mice,House Mice,House Mouse,Laboratory Mice,Laboratory Mouse,Mice, Swiss,Swiss Mouse,domesticus, Mus musculus
D051747	DNA-Activated Protein Kinase	A serine-threonine protein kinase that, when activated by DNA, phosphorylates several DNA-binding protein substrates including the TUMOR SUPPRESSOR PROTEIN P53 and a variety of TRANSCRIPTION FACTORS.	DNA-Dependent Protein Kinase,DNA-Dependent Protein Serine-Threonine Kinase,DNA Activated Protein Kinase,DNA Dependent Protein Kinase,DNA Dependent Protein Serine Threonine Kinase,Kinase, DNA-Activated Protein,Kinase, DNA-Dependent Protein,Protein Kinase, DNA-Activated,Protein Kinase, DNA-Dependent
D055503	Protein Multimerization	The assembly of the QUATERNARY PROTEIN STRUCTURE of multimeric proteins (MULTIPROTEIN COMPLEXES) from their composite PROTEIN SUBUNITS.	Protein Dimerization,Protein Heteromultimerizaton,Protein Multimer Assembly,Protein Trimerization,Assembly, Protein Multimer,Dimerization, Protein,Heteromultimerizaton, Protein,Heteromultimerizatons, Protein,Multimer Assembly, Protein,Multimerization, Protein,Trimerization, Protein