CATH Classification
Level | CATH Code | Description |
---|---|---|
3 | Alpha Beta | |
3.40 | 3-Layer(aba) Sandwich | |
3.40.50 | Rossmann fold | |
3.40.50.10190 | BRCT domain |
Domain Context
CATH Clusters
Superfamily | BRCT domain |
Functional Family | DNA ligase |
Enzyme Information
6.5.1.1 |
DNA ligase (ATP).
based on mapping to UniProt P49917
ATP + (deoxyribonucleotide)(n)-3'-hydroxyl + 5'-phospho- (deoxyribonucleotide)(m) = (deoxyribonucleotide)(n+m) + AMP + diphosphate.
-!- The enzyme catalyzes the ligation of DNA strands with 3'-hydroxyl and 5'-phosphate termini, forming a phosphodiester and sealing certain types of single-strand breaks in duplex DNA. -!- Catalysis occurs by a three-step mechanism, starting with the activation of the enzyme by ATP, forming a phosphoramide bond between adenylate and a lysine residue. -!- The adenylate group is then transferred to the 5'-phosphate terminus of the substrate, forming the capped structure 5'-(5'-diphosphoadenosine)-(DNA). -!- Finally, the enzyme catalyzes a nucleophilic attack of the 3'-OH terminus on the capped terminus, which results in formation of the phosphodiester bond and release of the adenylate. -!- RNA can also act as substrate, to some extent. -!- Cf. EC 6.5.1.2, EC 6.5.1.6 and EC 6.5.1.7.
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UniProtKB Entries (1)
Q13426 |
XRCC4_HUMAN
Homo sapiens
DNA repair protein XRCC4
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PDB Structure
PDB | 3II6 |
External Links | |
Method | X-RAY DIFFRACTION |
Organism | |
Primary Citation |
Structural and functional interaction between the human DNA repair proteins DNA ligase IV and XRCC4
MOL.CELL.BIOL.
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