Antibodies against the following proteins were used for immunofluorescence (IF) and Western blotting (WB): γH2AX (05–636 JBW301; Upstate Biotechnology), CENPF (ab5; Abcam), RPA (NA-18, Ab-2; Calbiochem for IF, LS-C38952; LifeSpan BioSciences for WB), pRPA S4/8 (A300-245A; Bethyl Laboratories), pDNA-PKcs S2056 (ab18192), DNA-PKcs (12311; Cell Signaling), Ku80 (2180 (C48E7); Cell Signaling), pKAP-1 S824 (A300-767A; Bethyl Laboratories), KAP-1 (ab3831; Abcam), MRE11 (12D7, GTX70212; GeneTex), NBS1 (PC269, Ab-1; Oncogene), RAD50 (3427; Cell Signaling), pATM S1981 (2152–1; Epitomics), ATM (GTX70103 2C1; GeneTex), CtIP (A300-488A; Bethyl Laboratories), and β-tubulin (ab21058; Abcam). Ku70, XLF, XRCC4, and Ligase IV antibodies were kind gifts from Dr. Penny Jeggo. Immunoblotting was performed as described previously [17 (link)].
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