Action of DNA repair endonuclease ERCC1/XPF in living cells.
To study the nuclear organization and dynamics of nucleotide excision repair (NER), the endonuclease ERCC1/XPF (for excision repair cross complementation group 1/xeroderma pigmentosum group F) was tagged with green fluorescent protein and its mobility was monitored in living Chinese hamster ovary cells. In the absence of DNA damage, the complex moved freely through the nucleus, with a diffusion coefficient (15 +/- 5 square micrometers per second) consistent with its molecular size. Ultraviolet light-induced DNA damage caused a transient dose-dependent immobilization of ERCC1/XPF, likely due to engagement of the complex in a single repair event. After 4 minutes, the complex regained mobility. These results suggest (i) that NER operates by assembly of individual NER factors at sites of DNA damage rather than by preassembly of holocomplexes and (ii) that ERCC1/XPF participates in repair of DNA damage in a distributive fashion rather than by processive scanning of large genome segments.
|Keywords||*DNA Damage, *DNA Repair, 0 (DNA-Binding Proteins), 0 (ERCC4 protein), 0 (Luminescent Proteins), 0 (Proteins), 0 (Recombinant Fusion Proteins), 147336-22-9 (green fluorescent protein), Animals, CHO Cells, Cell Line, Transformed, Cell Nucleus/metabolism, DNA-Binding Proteins/*metabolism, Diffusion, EC 3.1.- (ERCC-1 protein, human), EC 3.1.- (Endonucleases), Endonucleases/*metabolism, Fluorescence, Hamsters, Hela Cells, Human, Luminescent Proteins, Microscopy, Confocal, Microscopy, Fluorescence, Proteins/*metabolism, Recombinant Fusion Proteins/metabolism, Support, Non-U.S. Gov't, Transfection, Ultraviolet Rays|
|Persistent URL||dx.doi.org/10.1126/science.284.5416.958, hdl.handle.net/1765/3160|
Houtsmuller, A.B., Rademakers, S., Nigg, A.L., Hoogstraten, D., Hoeijmakers, J.H.J., & Vermeulen, W.. (1999). Action of DNA repair endonuclease ERCC1/XPF in living cells.. Science, 284(5416), 958–961. doi:10.1126/science.284.5416.958