Abstract:
:The function of protein phosphatase 1 nuclear-targeting subunit (PNUTS)--one of the most abundant nuclear-targeting subunits of protein phosphatase 1 (PP1c)--remains largely uncharacterized. We show that PNUTS depletion by small interfering RNA activates a G2 checkpoint in unperturbed cells and prolongs G2 checkpoint and Chk1 activation after ionizing-radiation-induced DNA damage. Overexpression of PNUTS-enhanced green fluorescent protein (EGFP)--which is rapidly and transiently recruited at DNA damage sites--inhibits G2 arrest. Finally, γH2AX, p53-binding protein 1, replication protein A and Rad51 foci are present for a prolonged period and clonogenic survival is decreased in PNUTS-depleted cells after ionizing radiation treatment. We identify the PP1c regulatory subunit PNUTS as a new and integral component of the DNA damage response involved in DNA repair.
journal_name
EMBO Repjournal_title
EMBO reportsauthors
Landsverk HB,Mora-Bermúdez F,Landsverk OJ,Hasvold G,Naderi S,Bakke O,Ellenberg J,Collas P,Syljuåsen RG,Küntziger Tdoi
10.1038/embor.2010.134subject
Has Abstractpub_date
2010-11-01 00:00:00pages
868-75issue
11eissn
1469-221Xissn
1469-3178pii
embor2010134journal_volume
11pub_type
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