2010
Cdk1 targets Srs2 to complete synthesis-dependent strand annealing and to promote
MARCO, Saporano, Callahan DEVON, Zheng XIUZHONG, Lumír KREJČÍ, Haber JAMES et. al.Základní údaje
Originální název
Cdk1 targets Srs2 to complete synthesis-dependent strand annealing and to promote
Název česky
Cdk1 targets Srs2 to complete synthesis-dependent strand annealing and to promote
Autoři
MARCO, Saporano (380 Itálie), Callahan DEVON (840 Spojené státy), Zheng XIUZHONG (840 Spojené státy), Lumír KREJČÍ (203 Česká republika, garant, domácí), Haber JAMES (840 Spojené státy), Klein HANNAH (840 Spojené státy) a Liberi GIORDANO (380 Itálie)
Vydání
PLoS Genetics, Public Library of Science, 2010, 1553-7390
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10600 1.6 Biological sciences
Stát vydavatele
Spojené státy
Utajení
není předmětem státního či obchodního tajemství
Impakt faktor
Impact factor: 9.543
Kód RIV
RIV/00216224:14110/10:00043106
Organizační jednotka
Lékařská fakulta
UT WoS
000275262700009
Klíčová slova anglicky
DNA repair; DNA damage; replication; genomic instability
Příznaky
Mezinárodní význam, Recenzováno
Změněno: 19. 1. 2011 05:38, doc. Mgr. Lumír Krejčí, Ph.D.
V originále
Cdk1 kinase phosphorylates budding yeast Srs2, a member of UvrD protein family that displays both DNA translocation and DNA unwinding activities in vitro. Srs2 prevents homologous recombination by dismantling Rad51 filaments and it is also required for double strand break repair. Here we examine the biological significance of Cdk1-dependent phosphorylation of Srs2 using mutants that constitutively express the phosphorylated or unphosphorylated isoforms. We found that Cdk1 targets Srs2 to repair double strand break (DSB) after strand invasion. Srs2 phosphorylation is required to complete synthesis-dependent strand annealing pathway, likely controlling the disassembly of the D-loop intermediate. Cdk1 phosphorylation, indeed, controls the turnover of Srs2 protein at the invading strand, while it is not required for that of Rad51. Further analysis on the recombination phenotypes of the srs2 phospho-mutants indicated that Srs2 phosphorylation is not indeed essential for the removal of toxic Rad51 nucleofilaments, while it is plays a role when DNA breaks are channeled into the homologous recombinational repair. Cdk1-targeted Srs2 might have attenuated ability to inhibit recombination and it does not need to interact with PCNA to promote recombinational repair. Finally, we demonstrated that the recombination defects of unphosphorylatable Srs2 are mainly due to the unscheduled accumulation of the protein in a sumoylated form. Thus, Srs2 function in removing toxic Rad51 filaments is separable from its role in promoting recombinational repair, which exclusively depends on Cdk1-dependent phosphorylation. We suggest that Cdk1 kinase counteracts sumoylation and targets Srs2 to dismantle specific DNA structures in a helicase-dependent manner during homologous recombinational repair.
Česky
Cdk1 kinase phosphorylates budding yeast Srs2, a member of UvrD protein family that displays both DNA translocation and DNA unwinding activities in vitro. Srs2 prevents homologous recombination by dismantling Rad51 filaments and it is also required for double strand break repair. Here we examine the biological significance of Cdk1-dependent phosphorylation of Srs2 using mutants that constitutively express the phosphorylated or unphosphorylated isoforms. We found that Cdk1 targets Srs2 to repair double strand break (DSB) after strand invasion. Srs2 phosphorylation is required to complete synthesis-dependent strand annealing pathway, likely controlling the disassembly of the D-loop intermediate. Cdk1 phosphorylation, indeed, controls the turnover of Srs2 protein at the invading strand, while it is not required for that of Rad51. Further analysis on the recombination phenotypes of the srs2 phospho-mutants indicated that Srs2 phosphorylation is not indeed essential for the removal of toxic Rad51 nucleofilaments, while it is plays a role when DNA breaks are channeled into the homologous recombinational repair. Cdk1-targeted Srs2 might have attenuated ability to inhibit recombination and it does not need to interact with PCNA to promote recombinational repair. Finally, we demonstrated that the recombination defects of unphosphorylatable Srs2 are mainly due to the unscheduled accumulation of the protein in a sumoylated form. Thus, Srs2 function in removing toxic Rad51 filaments is separable from its role in promoting recombinational repair, which exclusively depends on Cdk1-dependent phosphorylation. We suggest that Cdk1 kinase counteracts sumoylation and targets Srs2 to dismantle specific DNA structures in a helicase-dependent manner during homologous recombinational repair.
Návaznosti
| GA301/09/1917, projekt VaV |
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| GD203/09/H046, projekt VaV |
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| ME10048, projekt VaV |
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| MSM0021622413, záměr |
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