Protein: DNA ligase 3 (EC 6.5.1.1) (DNA ligase III) (Polydeoxyribonucleotide synthase [ATP] 3) (P49916)
Organism: Homo sapiens (Human)
Function: Isoform 3 functions as heterodimer with DNA-repair protein XRCC1 in the nucleus and can correct defective DNA strand-break repair and sister chromatid exchange following treatment with ionizing radiation and alkylating agents. Isoform 1 is targeted to mitochondria, where it functions as DNA ligase in mitochondrial base-excision DNA repair.
Subcellular location: [Isoform 1]: Mitochondrion {ECO:0000269|PubMed:10207110, ECO:0000269|PubMed:24674627}. Note=Contains an N-terminal mitochondrial transit peptide. {ECO:0000269|PubMed:10207110}.; SUBCELLULAR LOCATION: [Isoform 2]: Mitochondrion {ECO:0000305|PubMed:10207110}. Note=Contains an N-terminal mitochondrial transit peptide. {ECO:0000305|PubMed:10207110}.; SUBCELLULAR LOCATION: [Isoform 3]: Nucleus {ECO:0000269|PubMed:10207110}. Note=Lacks the N-terminal mitochondrial transit peptide. {ECO:0000269|PubMed:10207110}.; SUBCELLULAR LOCATION: [Isoform 4]: Nucleus {ECO:0000305|PubMed:10207110}. Note=Lacks the N-terminal mitochondrial transit peptide. {ECO:0000305|PubMed:10207110}.
Sequence: MSLAFKIFFPQTLRALSRKELCLFRKHHWRDVRQFSQWSETDLLHGHPLFLRRKPVLSFQGSHLRSRATYLVFLPGLHVGLCSGPCEMAEQRFCVDYAKRGTAGCKKCKEKIVKGVCRIGKVVPNPFSESGGDMKEWYHIKCMFEKLERARATTKKIEDLTELEGWEELEDNEKEQITQHIADLSSKAAGTPKKKAVVQAKLTTTGQVTSPVKGASFVTSTNPRKFSGFSAKPNNSGEAPSSPTPKRSLSSSKCDPRHKDCLLREFRKLCAMVADNPSYNTKTQIIQDFLRKGSAGDGFHGDVYLTVKLLLPGVIKTVYNLNDKQIVKLFSRIFNCNPDDMARDLEQGDVSETIRVFFEQSKSFPPAAKSLLTIQEVDEFLLRLSKLTKEDEQQQALQDIASRCTANDLKCIIRLIKHDLKMNSGAKHVLDALDPNAYEAFKASRNLQDVVERVLHNAQEVEKEPGQRRALSVQASLMTPVQPMLAEACKSVEYAMKKCPNGMFSEIKYDGERVQVHKNGDHFSYFSRSLKPVLPHKVAHFKDYIPQAFPGGHSMILDSEVLLIDNKTGKPLPFGTLGVHKKAAFQDANVCLFVFDCIYFNDVSLMDRPLCERRKFLHDNMVEIPNRIMFSEMKRVTKALDLADMITRVIQEGLEGLVLKDVKGTYEPGKRHWLKVKKDYLNEGAMADTADLVVLGAFYGQGSKGGMMSIFLMGCYDPGSQKWCTVTKCAGGHDDATLARLQNELDMVKISKDPSKIPSWLKVNKIYYPDFIVPDPKKAAVWEITGAEFSKSEAHTADGISIRFPRCTRIRDDKDWKSATNLPQLKELYQLSKEKADFTVVAGDEGSSTTGGSSEENKGPSGSAVSRKAPSKPSASTKKAEGKLSNSNSKDGNMQTAKPSAMKVGEKLATKSSPVKVGEKRKAADETLCQTKVLLDIFTGVRLYLPPSTPDFSRLRRYFVAFDGDLVQEFDMTSATHVLGSRDKNPAAQQVSPEWIWACIRKRRLVAPC
InterPro domains: - IPR012308: DNA ligase, ATP-dependent, N-terminal (domain) [264-433]
- IPR012310: DNA ligase, ATP-dependent, central (domain) [483-717]
- IPR036599: DNA ligase, ATP-dependent, N-terminal domain superfamily (homologous_superfamily) [258-497]
- IPR050191: ATP-dependent DNA ligase (family) [86-856]
- IPR000977: DNA ligase, ATP-dependent (family) [319-830]
- IPR001510: Zinc finger, PARP-type (domain) [93-185]
- IPR016059: DNA ligase, ATP-dependent, conserved site (conserved_site) [506-677]
- IPR031916: DNA ligase 3, BRCT domain (domain) [934-1003]
- IPR036957: Zinc finger, PARP-type superfamily (homologous_superfamily) [91-186]
- IPR012309: DNA ligase, ATP-dependent, C-terminal (domain) [705-814]
- IPR001357: BRCT domain (domain) [933-1009]
- IPR012340: Nucleic acid-binding, OB-fold (homologous_superfamily) [688-832]
- IPR036420: BRCT domain superfamily (homologous_superfamily) [922-1009]
Interaction partners: - DNA repair protein XRCC1
- DNA polymerase beta
- Bifunctional polynucleotide phosphatase/kinase
- X-ray repair cross-complementing protein 6
- Tyrosyl-DNA phosphodiesterase 1
- Poly [ADP-ribose] polymerase 2
- Poly [ADP-ribose] polymerase 1
- Aprataxin
- DNA repair nuclease/redox regulator APEX1
- Aprataxin and PNK-like factor
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0005488 (binding), GO:0003824 (catalytic activity), GO:0016874 (ligase activity), GO:0140640 (catalytic activity, acting on a nucleic acid), GO:0097159 (organic cyclic compound binding), GO:1901363 (heterocyclic compound binding), GO:0003676 (nucleic acid binding), GO:0016886 (ligase activity, forming phosphoric ester bonds), GO:0140097 (catalytic activity, acting on DNA), GO:0003677 (DNA binding), GO:0003909 (DNA ligase activity)
Biological Process (BP): GO:0008150 (biological process), GO:0008152 (metabolic process), GO:0050896 (response to stimulus), GO:0009987 (cellular process), GO:0044237 (cellular metabolic process), GO:0006807 (nitrogen compound metabolic process), GO:0051716 (cellular response to stimulus), GO:0006950 (response to stress), GO:0071704 (organic substance metabolic process), GO:0044238 (primary metabolic process), GO:1901360 (organic cyclic compound metabolic process), GO:0006139 (nucleobase-containing compound metabolic process), GO:0046483 (heterocycle metabolic process), GO:0033554 (cellular response to stress), GO:0006725 (cellular aromatic compound metabolic process), GO:0034641 (cellular nitrogen compound metabolic process), GO:0044260 (cellular macromolecule metabolic process), GO:0043170 (macromolecule metabolic process), GO:0090304 (nucleic acid metabolic process), GO:0006974 (cellular response to DNA damage stimulus), GO:0006259 (DNA metabolic process), GO:0006281 (DNA repair), GO:0006266 (DNA ligation), GO:0006284 (base-excision repair), GO:0006302 (double-strand break repair), GO:0006303 (double-strand break repair via nonhomologous end joining)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0005622 (intracellular anatomical structure), GO:0043226 (organelle), GO:0031974 (membrane-enclosed lumen), GO:0005654 (nucleoplasm), GO:0043229 (intracellular organelle), GO:0043233 (organelle lumen), GO:0043227 (membrane-bounded organelle), GO:0043231 (intracellular membrane-bounded organelle), GO:0070013 (intracellular organelle lumen), GO:0031981 (nuclear lumen), GO:0005634 (nucleus)