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Identification of the gene for DNA helicase II of Escherichia coli

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Taucher-Scholz,  Gisela
Max Planck Institute for Medical Research, Max Planck Society;

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Hoffmann-Berling,  Hartmut
Department of Molecular Biology, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Taucher-Scholz, G., & Hoffmann-Berling, H. (1983). Identification of the gene for DNA helicase II of Escherichia coli. European Journal of Biochemistry, 137(3), 573-580. doi:10.1111/j.1432-1033.1983.tb07864.x.


Cite as: https://hdl.handle.net/21.11116/0000-0003-5B30-1
Abstract
Using a modification of the solid-phase radioimmune assay of Broome and Gilbert [Proc. Natl Acad. Sci. USA, 75, 2746 (1978)] to screen the plaques of lambda recombinant phages for the presence of an elevated level of helicase-II-specific antigen, we have identified the gene for helicase II in a library of Escherichia coli DNA. The DNA selected was subcloned from lambda into plasmid vectors; restriction analysis located the DNA region encoding helicase II in a PvuII fragment identical in size (2900 base pairs) and restriction pattern to that which contains the uvrD gene. Plasmids carrying this DNA fragment complemented the increased sensitivity to ultraviolet irradiation and the mutator phenotype of uvrD mutants. Furthermore, uvrD502 mutant cells were found to liberate no helicase II activity upon extraction. Following transformation with the cloned DNA, active helicase II was recovered from the mutant cells. These results support the view that helicase II is encoded by uvrD