Radicella J P, Clark E A, Fox M S
Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.
Proc Natl Acad Sci U S A. 1988 Dec;85(24):9674-8. doi: 10.1073/pnas.85.24.9674.
Heterozygous bacteriophage lambda DNA molecules, whose replication requires mismatch correction of a mutant nucleotide in the transcribed strand, provide an assay for localized mismatch repair in Escherichia coli. We describe two systems: one removes the A in C.A or G.A mismatches and the other removes one or the other C in a C.C mismatch. Mutations disabling the first system result in a mutator phenotype that may be identical to mutY.
杂合噬菌体λDNA分子的复制需要对转录链中的突变核苷酸进行错配校正,这为大肠杆菌中的局部错配修复提供了一种检测方法。我们描述了两种系统:一种去除C.A或G.A错配中的A,另一种去除C.C错配中的一个C。使第一个系统失活的突变会导致一种突变体表型,可能与mutY相同。