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. 1989 Feb;86(4):1163–1167. doi: 10.1073/pnas.86.4.1163

UV-induced DNA-binding proteins in human cells.

P M Glazer 1, N A Greggio 1, J E Metherall 1, W C Summers 1
PMCID: PMC286646  PMID: 2919165

Abstract

To investigate the response of human cells to DNA-damaging agents such as UV irradiation, we examined nuclear protein extracts of UV-irradiated HeLa cells for the presence of DNA-binding proteins. Electrophoretically separated proteins were transferred to a nitrocellulose filter that was subsequently immersed in a binding solution containing radioactively labeled DNA probes. Several DNA-binding proteins were induced in HeLa cells after UV irradiation. These included proteins that bind predominantly double-stranded DNA and proteins that bind both double-stranded and single-stranded DNA. The binding proteins were induced in a dose-dependent manner by UV light. Following a dose of 12 J/m2, the binding proteins in the nuclear extracts increased over time to a peak in the range of 18 hr after irradiation. Experiments with metabolic inhibitors (cycloheximide and actinomycin D) revealed that de novo synthesis of these proteins is not required for induction of the binding activities, suggesting that the induction is mediated by protein modification.

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Selected References

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