|PROSITE documentation PDOC00295 [for PROSITE entry PS50160]|
DNA ligase (polydeoxyribonucleotide synthase) is the enzyme that joins two DNA fragments by catalyzing the formation of an internucleotide ester bond between phosphate and deoxyribose. It is active during DNA replication, DNA repair and DNA recombination. There are two forms of DNA ligase: one requires ATP (EC 18.104.22.168), the other NAD (EC 22.214.171.124).
Eukaryotic, archaebacterial, virus and phage DNA ligases are ATP-dependent. During the first step of the joining reaction, the ligase interacts with ATP to form a covalent enzyme-adenylate intermediate. A conserved lysine residue is the site of adenylation [1,2].
Apart from the active site region, the only conserved region common to all ATP-dependent DNA ligases is found  in the C-terminal section and contains a conserved glutamate as well as four positions with conserved basic residues.
We developed signature patterns for both conserved regions.Last update:
April 2006 / Patterns revised.
PROSITE methods (with tools and information) covered by this documentation:
|1||Authors||Tomkinson A.E., Totty N.F., Ginsburg M., Lindahl T.|
|Title||Location of the active site for enzyme-adenylate formation in DNA ligases.|
|Source||Proc. Natl. Acad. Sci. U.S.A. 88:400-404(1991).|
|2||Authors||Lindahl T., Barnes D.E.|
|Title||Mammalian DNA ligases.|
|Source||Annu. Rev. Biochem. 61:251-281(1992).|
|Title||Molecular characterisation of a DNA ligase gene of the extremely thermophilic archaeon Desulfurolobus ambivalens shows close phylogenetic relationship to eukaryotic ligases.|
|Source||Nucleic Acids Res. 20:5389-5396(1992).|