Gene interactions and pathways from curated databases and text-mining
Mol Cell Biol 2003, PMID: 12640116

Polymerase mu is a DNA-directed DNA/RNA polymerase.

Nick McElhinny, Stephanie A; Ramsden, Dale A

DNA polymerases are defined as such because they use deoxynucleotides instead of ribonucleotides with high specificity. We show here that polymerase mu (pol mu), implicated in the nonhomologous end-joining pathway for repair of DNA double-strand breaks, incorporates both ribonucleotides and deoxynucleotides in a template-directed manner. pol mu has an approximately 1,000-fold-reduced ability to discriminate against ribonucleotides compared to that of the related pol beta, although pol mu's substrate specificity is similar to that of pol beta in most other respects. Moreover, pol mu more frequently incorporates ribonucleotides when presented with nucleotide concentrations that approximate cellular pools. We therefore addressed the impact of ribonucleotide incorporation on the activities of factors required for double-strand break repair by nonhomologous end joining. We determined that the ligase required for this pathway readily joined strand breaks with terminal ribonucleotides. Most significantly, pol mu frequently introduced ribonucleotides into the repair junctions of an in vitro nonhomologous end-joining reaction, an activity that would be expected to have important consequences in the context of cellular double-strand break repair.

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Text Mining Data

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Manually curated Databases

  • NCI Pathway Database DNA-PK pathway in nonhomologous end joining: XRCC4 (dimer)/Ligase IV complex (XRCC4-LIG4) → Ku/Artemis/DNA-PKcs (dimer)/Pol Mu/XRCC4 (dimer)/Ligase IV complex (XRCC6-XRCC5-DCLRE1C-PRKDC-POLM-XRCC4-LIG4) (modification, collaborate)
    Evidence: mutant phenotype, assay, physical interaction
  • NCI Pathway Database DNA-PK pathway in nonhomologous end joining: XRCC4 (dimer)/Ligase IV complex (XRCC4-LIG4) → Ku/Artemis/DNA-PKcs (dimer)/Pol Mu complex (XRCC6-XRCC5-DCLRE1C-PRKDC-POLM) (modification, collaborate)
    Evidence: mutant phenotype, assay, physical interaction
  • NCI Pathway Database DNA-PK pathway in nonhomologous end joining: Ku/Artemis/DNA-PKcs (dimer)/Pol Mu/XRCC4 (dimer)/Ligase IV complex (XRCC6-XRCC5-DCLRE1C-PRKDC-POLM-XRCC4-LIG4) → Ku/Artemis/DNA-PKcs (dimer)/Pol Mu complex (XRCC6-XRCC5-DCLRE1C-PRKDC-POLM) (modification, collaborate)
    Evidence: mutant phenotype, assay, physical interaction
  • NCI Pathway Database DNA-PK pathway in nonhomologous end joining: Pol Mu (POLM) → Ku/Artemis/DNA-PKcs (dimer) complex (XRCC6-XRCC5-DCLRE1C-PRKDC) (modification, collaborate)
    Evidence: mutant phenotype, assay, physical interaction
  • NCI Pathway Database DNA-PK pathway in nonhomologous end joining: Pol Mu (POLM) → Ku/Artemis/DNA-PKcs (dimer)/Pol Mu complex (XRCC6-XRCC5-DCLRE1C-PRKDC-POLM) (modification, collaborate)
    Evidence: mutant phenotype, assay, physical interaction
  • NCI Pathway Database DNA-PK pathway in nonhomologous end joining: Ku/Artemis/DNA-PKcs (dimer) complex (XRCC6-XRCC5-DCLRE1C-PRKDC) → Ku/Artemis/DNA-PKcs (dimer)/Pol Mu complex (XRCC6-XRCC5-DCLRE1C-PRKDC-POLM) (modification, collaborate)
    Evidence: mutant phenotype, assay, physical interaction
In total, 28 gene pairs are associated to this article in curated databases