TRF2和阿波罗与拓酶2α合作,保护人类端粒免受复制性损伤
Jing Ye1, Christelle Lenain, Serge Bauwens
1Shanghai Ruijin Hospital, School of Medicine of Shanghai Jiaotong University, 200025 Shanghai, China.
Cell
|July 27, 2010
概括
重复结合因子TRF2调节了阿波罗的重复结合因子.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生物化学
背景情况:
- 人类端粒,染色体末端的保护帽,是由蛋白质复合体维持的.
- 重复结合因子TRF2对于对DNA损伤的端粒保护至关重要.
- 阿波罗是一种金属β-乳酸酶,在DNA复制 (S阶段) 期间对端粒完整性至关重要.
研究的目的:
- 调查TRF2和阿波罗在端粒维护方面的监管关系.
- 阐明TRF2和阿波罗在保护端粒DNA免受损伤方面的作用.
- 了解DNA拓酶在TRF2-Apollo中介端粒保护中的参与.
主要方法:
- 生物化学试验研究TRF2和阿波罗的相互作用和酶活性.
- 基因分析以评估TRF2,阿波罗和DNA拓酶在端粒保护中的功能.
- 使用工程间歇性端粒重复通道的实验来评估DNA损伤抑制.
主要成果:
- TRF2直接调节其结合伙伴阿波罗的5'外核酶活性.
- TRF2和阿波罗合作,防止自然端粒和人工间歇端粒重复的DNA损伤.
- DNA拓酶2-α在与TRF2和阿波罗相同的端粒保护途径中起作用.
- TRF2和阿波罗在端粒中负面调节TOP1,TOP2alpha和TOP2beta的丰度,这表明它在复制过程中减轻拓应激的作用.
结论:
- TRF2和阿波罗形成了一个复合体,通过调节DNA处理和拓应力来保护端粒.
- 功能障碍的端粒复制,可能是由于拓问题,可能导致细胞衰老.
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