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Replication restart in Escherichia coli: Genetic studies at the interface of recombination and replication
DNA replication forks DNA damage proteins cells enzyme catalysis
2015/1/28
DNA replication forks are frequently detained during their progression from oriC to the replication terminus due to encounters with DNA lesions or proteins blocking the way. For survival, cells deploy...
Red重组系统及在微生物基因敲除中的应用--The Red Recombination System and Its Application to Gene Knock-out in Microorganism
Red重组系统 基因敲除 抗药性基因 Red recombination system gene knock-out resistant gene
2007/12/5
在完成了对各种微生物基因组的测序以后，功能基因学的研究变得尤为重要。研究基因功能最直接的方法便是将待研究的基因失活。最初构建基因突变体是采用大肠杆菌的RecA系统，但是RecA重组系统操作复杂，重组效率低。最近建立了Red重组系统，该系统由3个蛋白组成：α蛋白(即λ核酸外切酶)，β蛋白，Gam蛋白。应用Red系统进行基因敲除，可以直接利用线性打靶DNA，两侧同源臂长度在35~60 bp即可发生同源...