Multifunctional non-homologous end joining protein LigD - Q9I1X7 (LIGD_PSEAE)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q9I1X7: 6
With Ku probably forms a non-homologous end joining (NHEJ) repair enzyme, which repairs dsDNA breaks (DSB) with reduced fidelity. Acts as a DNA ligase on singly nicked dsDNA, fills dsDNA gaps (3- or 4- nucleotide gaps, prefers a 5'-phosphate at the gap distal end, prefers dNTPs over rNTPs) (PubMed:20018881), has DNA-directed DNA polymerase activity (templated primer extension) and DNA-directed RNA polymerase activity (PubMed:15897197), adds 1 or 2 non-templated rNTP (or less well dNTP) to ssDNA or blunt-end dsDNA (primer extension). Has 3' resection activity, removing 3'-rNMPs from DNA using its 3'-ribonuclease and 3'-phosphatase activities sequentially. Resection requires a 2'-OH in the penultimate nucleoside position (i.e. a ribo- not deoxyribonucleoside) (PubMed:15897197), although the 3'-phosphatase activity does not, and its specific activity is 16-fold higher on a DNA substrate (PubMed:16046407). On appropriate substrates will extend a DNA primer to the end of the template strand and then incorporate a non-templated nucleotide. UniProt
Catalytic Activity
ATP + deoxyribonucleotiden-3'-hydroxyl + 5'-phospho-deoxyribonucleotidem = deoxyribonucleotiden+m + AMP + diphosphate. UniProt
Pathway Maps
      ESCHER  BiGG
Subunit Structure
Monomer. Interacts with Ku. UniProt
The C-terminal polymerase/primase domain (Pol) (PubMed:15520014) adds up to 4 rNTPs in a DNA template-directed fashion (PubMed:15897197). UniProt
  • Other Gene names: ligD, PA2138
This protein in other organisms (by gene name):
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Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
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Validation Track

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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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