Mezzina M, Nocentini S
Nucleic Acids Res. 1978 Nov;5(11):4317-28. doi: 10.1093/nar/5.11.4317.
The DNA ligase activity of monkey kidney CV-1 cells has been measured at different stages of culture growth and after different time intervals following ultraviolet irradiation. Results indicate that: - The level of enzyme activity is about twice higher in non synchronous, rapidly dividing cells than in confluent cultures. - UV-irradiation of cells induces a "de novo" synthesis of DNA ligase. - This induction is dose dependent in its extent and kinetics, and may lead to a DNA ligase level in UV-irradiated stationary cultures of the same order as observed in unirradiated exponentially growing cells. - This induction seems to be independent of semiconservative DNA synthesis since it is not affected by fluorodeoxyuridine.
已在猴肾CV - 1细胞培养生长的不同阶段以及紫外线照射后的不同时间间隔测量了其DNA连接酶活性。结果表明:- 非同步快速分裂细胞中的酶活性水平比汇合培养细胞中的约高两倍。- 细胞的紫外线照射诱导DNA连接酶的“从头”合成。- 这种诱导在程度和动力学上是剂量依赖性的,并且可能导致紫外线照射的静止培养物中的DNA连接酶水平与未照射的指数生长细胞中观察到的水平相当。- 这种诱导似乎与半保留DNA合成无关,因为它不受氟脱氧尿苷的影响。