Microinjection of Escherichia coli UvrA, B, C and D proteins into fibroblasts of xeroderma pigmentosum complementation groups A and C does not result in restoration of UV-induced unscheduled DNA synthesis

J. C.M. Zwetsloot, A. P. Barbeiro, W. Vermeulen, H. M. Arthur, J. H.J. Hoeijmakers, C. Backendorf*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)

Abstract

The UV-induced unscheduled DNA synthesis (UDS) in cultured human fibroblasts of repair-deficient xeroderma pigmentosum complementation groups A and C was assayed after injection of identical activities of either Uvr excinuclease (UvrA, B, C and D) from Escherichia coli or endonuclease V from phage T4. Under conditions where the T4 enzyme was able to induce repair synthesis in both XP complementation groups in agreement with earlier observations (de Jonge et al., 1985), no effect of the UvrABCD excinuclease could be observed either when the enzymatic complex was injected into the cytoplasm, or when it was delivered directly into the nucleus. In additon, no effect of the E. coli excinuclease was found on the repair ability of normal repair-proficient human fibroblasts. We conclude that the UvrABCD excinuclease may not work on DNA lesions in human chromatin.

Original languageEnglish
Pages (from-to)89-98
Number of pages10
JournalMutation Research DNA Repair Reports
Volume166
Issue number1
DOIs
Publication statusPublished - Jul 1986

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