蓝藻鱼腥藻属中的紫外线诱导DNA修复
UV-inducible DNA repair in the cyanobacteria Anabaena spp.
作者信息
Levine E, Thiel T
出版信息
J Bacteriol. 1987 Sep;169(9):3988-93. doi: 10.1128/jb.169.9.3988-3993.1987.
Abstract
Strains of the filamentous cyanobacteria Anabaena spp. were capable of very efficient photoreactivation of UV irradiation-induced damage to DNA. Cells were resistant to several hundred joules of UV irradiation per square meter under conditions that allowed photoreactivation, and they also photoreactivated UV-damaged cyanophage efficiently. Reactivation of UV-irradiated cyanophage (Weigle reactivation) also occurred; UV irradiation of host cells greatly enhanced the plaque-forming ability of irradiated phage under nonphotoreactivating conditions. Postirradiation incubation of the host cells under conditions that allowed photoreactivation abolished the ability of the cells to perform Weigle reactivation of cyanophage N-1. Mitomycin C also induced Weigle reactivation of cyanophage N-1, but nalidixic acid did not. The inducible repair system (defined as the ability to perform Weigle reactivation of cyanophages) was relatively slow and inefficient compared with photoreactivation.
摘要
丝状蓝细菌鱼腥藻属的菌株能够非常有效地对紫外线照射引起的DNA损伤进行光复活。在允许光复活的条件下，细胞对每平方米数百焦耳的紫外线照射具有抗性，并且它们还能有效地使紫外线损伤的蓝噬菌体光复活。紫外线照射的蓝噬菌体也会发生复活（韦格勒复活）；在无光复活条件下，宿主细胞的紫外线照射极大地增强了受照射噬菌体的噬菌斑形成能力。在允许光复活的条件下对宿主细胞进行照射后孵育，消除了细胞对蓝噬菌体N-1进行韦格勒复活的能力。丝裂霉素C也诱导蓝噬菌体N-1的韦格勒复活，但萘啶酸则不能。与光复活相比，可诱导修复系统（定义为对蓝噬菌体进行韦格勒复活的能力）相对缓慢且效率低下。
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