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- W1978714054 abstract "Rad18 protein is required for mono-ubiquitination of PCNA and trans-lesion synthesis during DNA lesion bypass in eukaryotic cells but it remains unknown how it is activated after DNA damage. We expressed GFP-tagged human (h)Rad18 in Chinese hamster cells and found that it can be completely extracted from undamaged nuclei by Triton X-100 and methanol. However, several hours after treatment with methyl methanesulfonate (MMS) Triton-insoluble form of GFP-hRad18 accumulates in S-phase nuclei where it colocalizes with PCNA. This accumulation is suppressed by inhibitors of protein kinases staurosporine and wortmannin but is not effected by roscovitine. We also found that methyl methanesulfonate induces phosphorylation of Ser-317 in protein kinase Chk1 and Ser-139 in histone H2AX and stimulates formation of single-stranded DNA at replication foci. Together, our results suggest that MMS-induced accumulation of hRad18 protein at stalled forks involves protein phosphorylation which may be performed by S-phase checkpoint kinases." @default.
- W1978714054 created "2016-06-24" @default.
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- W1978714054 date "2004-10-01" @default.
- W1978714054 modified "2023-10-14" @default.
- W1978714054 title "DNA damage-induced accumulation of Rad18 protein at stalled replication forks in mammalian cells involves upstream protein phosphorylation" @default.
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- W1978714054 doi "https://doi.org/10.1016/j.bbrc.2004.08.165" @default.
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