人类Mn-超氧化物脱酶乙化保护免受酶化和无活化
Gianfranco Frattini1, Juan L Puzzolo1, Salvador I Drusin1
1Instituto de Química Rosario (CONICET-UNR) and Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Rosario, Santa Fe, Argentina.
在Lys29中对超氧化物脱酶 (MnSOD) 的乙化,通过阻碍超氧化物进入来降低其活性. 这种可逆的修改可能会保护MnSOD在细胞应激过程中免受过氧酸盐的不可逆性失活.
科学领域:
- 线粒体的生物化学
- 酶学 是一种酶学.
- 后翻译修改后的修改.
背景情况:
- 超氧化物脱酶 (MnSOD) 排毒线粒体中的超氧化基,保持氧化平衡.
- 像乙化和化这样的翻译后修饰 (PTM) 调节了MnSOD的活性.
- 过氧酸盐诱导的化Tyr34不可逆地使MnSOD无活化,这是各种病理的标志.
研究的目的:
- 为了研究Lys29乙化对MnSOD活性的影响.
- 探索Lys29乙化和Tyr34化通过过氧酸盐之间的相互作用.
- 阐明乙化作为MnSOD的调节机制的作用.
主要方法:
- 分子动力学 (MD) 模拟来分析Lys29乙化对活性部位的影响.
- 静电电位计算,以评估超氧化物亲和力的变化.
- 布朗动力学 (BD) 模拟以确定超氧化物的关联速率常数 (k_on).
- 在体外实验验验证模拟结果,并研究与的相互作用.
主要成果:
- 29乙化部分阻断了MnSOD活性位点通道,降低了超氧化物可访问性.
- 在Lys29的乙化降低了活性位点周围的正电荷,降低了超氧化物亲和力.
- 在Lys29乙化后,BD模拟显示MnSOD的超氧化物联结速率常数 (k_on) 在Lys29乙化后减少了50%.
- 实验室研究表明,乙化可以防止Tyr34化,从而保护MnSOD免受无活化.
结论:
- lys29乙化作为MnSOD活动的可逆调节机制.
- 乙化调节MnSOD与超氧化物和过氧酸盐的相互作用.
- 这种修改在应激条件下提供了保护作用,防止不可逆转的MnSOD无活化.
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