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Mol Cell. 2005 Dec 9;20(5):801-9. Epub 2005 Nov 28.

gamma-H2AX dephosphorylation by protein phosphatase 2A facilitates DNA double-strand break repair.

Author information

1
CBR Institute for Biomedical Research and The Department of Pediatrics, Harvard Medical School, Boston, Massachusetts 02115, USA.

Abstract

Phosphorylated histone H2AX (gamma-H2AX) forms foci over large chromatin domains surrounding double-stranded DNA breaks (DSB). These foci recruit DSB repair proteins and dissolve during or after repair is completed. How gamma-H2AX is removed from chromatin remains unknown. Here, we show that protein phosphatase 2A (PP2A) is involved in removing gamma-H2AX foci. The PP2A catalytic subunit [PP2A(C)] and gamma-H2AX coimmunoprecipitate and colocalize in DNA damage foci and PP2A dephosphorylates gamma-H2AX in vitro. The recruitment of PP2A(C) to DNA damage foci is H2AX dependent. When PP2A(C) is inhibited or silenced by RNA interference, gamma-H2AX foci persist, DNA repair is inefficient, and cells are hypersensitive to DNA damage. The effect of PP2A on gamma-H2AX levels is independent of ATM, ATR, or DNA-PK activity.

PMID:
16310392
DOI:
10.1016/j.molcel.2005.10.003
[Indexed for MEDLINE]
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