George J, Devoret R, Radman M
Proc Natl Acad Sci U S A. 1974 Jan;71(1):144-7. doi: 10.1073/pnas.71.1.144.
When an F(-) recipient Escherichia coli K12 bacterium receives Hfr or F-lac(+) DNA from an ultraviolet-irradiated donor, its capacity to promote DNA repair and mutagenesis of ultraviolet-damaged phage lambda is substantially increased. We call this phenomenon indirect ultraviolet-reactivation, since its features are essentially the same as those of ultraviolet-reactivation; this repair process occurs in pyrimidine dimer excision-deficient strains and produces clear plaque mutations of the restored phage. Moreover, this process is similar to indirect ultraviolet-induction of prophage lambda, since it is promoted by conjugation. However, contrarily to indirect induction, it is produced by Hfr donors and occurs in recipients restricting the incoming ultraviolet-damaged donor DNA. The occurrence of indirect ultraviolet-reactivation provides evidence for the existence in E. coli of an inducible error-prone mechanism for the repair of DNA.
当一个F(-)受体大肠杆菌K12细菌从经紫外线照射的供体接收Hfr或F-lac(+) DNA时,其促进紫外线损伤的噬菌体λ的DNA修复和诱变的能力会大幅提高。我们将此现象称为间接紫外线复活,因为其特征与紫外线复活基本相同;这种修复过程发生在嘧啶二聚体切除缺陷型菌株中,并产生恢复噬菌体的清晰噬菌斑突变。此外,此过程类似于噬菌体λ的间接紫外线诱导,因为它是由接合作用促进的。然而,与间接诱导相反,它是由Hfr供体产生的,并且发生在限制进入的紫外线损伤供体DNA的受体中。间接紫外线复活的发生为大肠杆菌中存在一种可诱导的易错DNA修复机制提供了证据。