Cooperation of DNA-PKcs and WRN helicase in the maintenance of telomeric D-loops
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Cooperation of DNA-PKcs and WRN helicase in the maintenance of telomeric D-loops. / Kusumoto-Matsuo, Rika; Opresko, Patricia L; Ramsden, Dale; Tahara, Hidetoshi; Bohr, Vilhelm A.
In: Aging, Vol. 2, No. 5, 01.05.2010, p. 274-84.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Cooperation of DNA-PKcs and WRN helicase in the maintenance of telomeric D-loops
AU - Kusumoto-Matsuo, Rika
AU - Opresko, Patricia L
AU - Ramsden, Dale
AU - Tahara, Hidetoshi
AU - Bohr, Vilhelm A
PY - 2010/5/1
Y1 - 2010/5/1
N2 - Werner syndrome is an inherited human progeriod syndrome caused by mutations in the gene encoding the Werner Syndrome protein, WRN. It has both 3'-5' DNA helicase and exonuclease activities, and is suggested to have roles in many aspects of DNA metabolism, including DNA repair and telomere maintenance. The DNA-PK complex also functions in both DNA double strand break repair and telomere maintenance. Interaction between WRN and the DNA-PK complex has been reported in DNA double strand break repair, but their possible cooperation at telomeres has not been reported. This study analyzes thein vitro and in vivo interaction at the telomere between WRN and DNA-PKcs, the catalytic subunit of DNA-PK. The results show that DNA-PKcs selectively stimulates WRN helicase but not WRN exonuclease in vitro, affecting that WRN helicase unwinds and promotes the release of the full-length invading strand of a telomere D-loop model substrate. In addition, the length of telomeric G-tails decreases in DNA-PKcs knockdown cells, and this phenotype is reversed by overexpression of WRN helicase. These results suggest that WRN and DNA-PKcs may cooperatively prevent G-tail shortening in vivo.
AB - Werner syndrome is an inherited human progeriod syndrome caused by mutations in the gene encoding the Werner Syndrome protein, WRN. It has both 3'-5' DNA helicase and exonuclease activities, and is suggested to have roles in many aspects of DNA metabolism, including DNA repair and telomere maintenance. The DNA-PK complex also functions in both DNA double strand break repair and telomere maintenance. Interaction between WRN and the DNA-PK complex has been reported in DNA double strand break repair, but their possible cooperation at telomeres has not been reported. This study analyzes thein vitro and in vivo interaction at the telomere between WRN and DNA-PKcs, the catalytic subunit of DNA-PK. The results show that DNA-PKcs selectively stimulates WRN helicase but not WRN exonuclease in vitro, affecting that WRN helicase unwinds and promotes the release of the full-length invading strand of a telomere D-loop model substrate. In addition, the length of telomeric G-tails decreases in DNA-PKcs knockdown cells, and this phenotype is reversed by overexpression of WRN helicase. These results suggest that WRN and DNA-PKcs may cooperatively prevent G-tail shortening in vivo.
KW - Calcium-Binding Proteins
KW - Cell Line
KW - DNA
KW - DNA Repair
KW - Exodeoxyribonucleases
KW - Humans
KW - RecQ Helicases
KW - Telomere
KW - Werner Syndrome
M3 - Journal article
C2 - 20519774
VL - 2
SP - 274
EP - 284
JO - Aging
JF - Aging
SN - 1945-4589
IS - 5
ER -
ID: 33492192