An in vitro complementation assay for the Escherichia coli uvrD gene product.
作者信息
Kuemmerle N B, Masker W E
出版信息
Nucleic Acids Res. 1983 Apr 11;11(7):2193-204. doi: 10.1093/nar/11.7.2193.
Abstract
An in vitro assay specific for the product of the uvrD gene of Escherichia coli has been developed. This assay, derived from properties of uvrD mutants revealed by in vivo experiments, is based on the necessity for a functional UvrD protein for complete rejoining of covalently closed circular DNA during the excision repair of UV-induced damage. Extracts prepared from gently lysed uvrD101 mutant cells are capable of restoring UV-damaged DNA to its covalently closed circular form when provided with a functional UvrD protein from other repair-deficient cell extracts or from partially purified protein fractions. This assay was employed to monitor the activity of the UvrD protein after several steps of fractionation. The partially purified UvrD protein does not complement extracts deficient in DNA polymerase I or temperature-sensitive in DNA ligase; it does, however, complement extracts from strains mutant at the uvrE and recL loci, which are considered allelic with the uvrD locus.
摘要
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