ENTRY       mtr03450                    Pathway
NAME        Non-homologous end-joining - Medicago truncatula (barrel medic)
DESCRIPTION Nonhomologous end joining (NHEJ) eliminates DNA double-strand breaks (DSBs) by direct ligation. NHEJ involves binding of the KU heterodimer to double-stranded DNA ends, recruitment of DNA-PKcs (MRX complex in yeast), processing of ends, and recruitment of the DNA ligase IV (LIG4)-XRCC4 complex, which brings about ligation. A recent study shows that bacteria accomplish NHEJ using just two proteins (Ku and DNA ligase), whereas eukaryotes require many factors. NHEJ repairs DSBs at all stages of the cell cycle, bringing about the ligation of two DNA DSBs without the need for sequence homology, and so is error-prone.
CLASS       Genetic Information Processing; Replication and repair
PATHWAY_MAP mtr03450  Non-homologous end-joining
DBLINKS     GO: 0006303
ORGANISM    Medicago truncatula (barrel medic) [GN:mtr]
GENE        11441760  ATP-dependent DNA helicase 2 subunit KU70 [KO:K10884]
            11423056  ATP-dependent DNA helicase 2 subunit KU80 [KO:K10885]
            25498091  DNA polymerase lambda [KO:K03512] [EC:2.7.7.7 4.2.99.-]
            11418046  DNA polymerase lambda [KO:K03512] [EC:2.7.7.7 4.2.99.-]
            11441582  DNA ligase 4 [KO:K10777] [EC:6.5.1.1]
            11419613  DNA repair protein XRCC4 [KO:K10886]
            11435676  DNA repair protein RAD50 isoform X1 [KO:K10866] [EC:3.6.-.-]
            11436847  double-strand break repair protein MRE11 [KO:K10865]
            11412823  flap endonuclease 1 [KO:K04799] [EC:3.1.-.-]
REFERENCE   PMID:16971555
  AUTHORS   Gennery AR.
  TITLE     Primary immunodeficiency syndromes associated with defective DNA double-strand break repair.
  JOURNAL   Br Med Bull 77-78:71-85 (2006)
            DOI:10.1093/bmb/ldl006
REFERENCE   PMID:17589524
  AUTHORS   Zhang Y, Hefferin ML, Chen L, Shim EY, Tseng HM, Kwon Y, Sung P, Lee SE, Tomkinson AE.
  TITLE     Role of Dnl4-Lif1 in nonhomologous end-joining repair complex assembly and suppression of homologous recombination.
  JOURNAL   Nat Struct Mol Biol 14:639-46 (2007)
            DOI:10.1038/nsmb1261
REFERENCE   PMID:16895466
  AUTHORS   Wyman C, Kanaar R.
  TITLE     DNA double-strand break repair: all's well that ends well.
  JOURNAL   Annu Rev Genet 40:363-83 (2006)
            DOI:10.1146/annurev.genet.40.110405.090451
REFERENCE   PMID:15578053
  AUTHORS   Weller GR, Brandt VL, Roth DB.
  TITLE     Doing more with less in bacterial DNA repair.
  JOURNAL   Nat Struct Mol Biol 11:1158-9 (2004)
            DOI:10.1038/nsmb1204-1158
REFERENCE   PMID:12215643
  AUTHORS   Weller GR, Kysela B, Roy R, Tonkin LM, Scanlan E, Della M, Devine SK, Day JP, Wilkinson A, d'Adda di Fagagna F, Devine KM, Bowater RP, Jeggo PA, Jackson SP, Doherty AJ.
  TITLE     Identification of a DNA nonhomologous end-joining complex in bacteria.
  JOURNAL   Science 297:1686-9 (2002)
            DOI:10.1126/science.1074584
REFERENCE   PMID:17506672
  AUTHORS   Pitcher RS, Brissett NC, Doherty AJ.
  TITLE     Nonhomologous end-joining in bacteria: a microbial perspective.
  JOURNAL   Annu Rev Microbiol 61:259-82 (2007)
            DOI:10.1146/annurev.micro.61.080706.093354
KO_PATHWAY  ko03450
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