SIRT3通过可逆酶脱乙化来调节线粒体脂肪酸的氧化
Matthew D Hirschey1, Tadahiro Shimazu, Eric Goetzman
1Gladstone Institute of Virology and Immunology, San Francisco, California 94158, USA.
Nature
|March 6, 2010
概括
缺乏Sirtuin 3 (SIRT3) 的小鼠在禁食期间表现出脂肪酸氧化受损,这是由于LCAD等关键酶的过化,导致代谢功能障碍. 这突出了SIRT3的功能.
科学领域:
- 线粒体生物学和新陈代谢
- 酶调节和翻译后的修改.
背景情况:
- 锡尔图因是依赖NAD (((+) 的脱乙酶,参与应激反应和代谢适应.
- 锡尔图因3 (SIRT3) 是一种线粒体脱甲基酶,调节了代谢酶乙化.
- 缺乏SIRT3的小鼠在基底条件下表现出线粒体蛋白质过乙化.
研究的目的:
- 研究SIRT3在禁食期间调节线粒体脂肪酸氧化中的作用.
- 确定参与代谢适应禁食的特定SIRT3点.
主要方法:
- 在禁食期间对野生类型和SIRT3缺乏的小鼠的肝脏和棕色脂肪组织进行比较分析.
- 测量脂肪酸氧化中间体和甘油三.
- 质谱测量以识别超乙化线粒体蛋白质,包括LCAD.
- 在SIRT3.3使用的体外和体外脱乙烯化试验.
主要成果:
- 禁食期间,SIRT3的表达在肝脏和棕色脂肪组织中受到上调.
- 缺少SIRT3的小鼠在禁食期间表现出脂肪酸氧化受损,甘油三酸增加,以及在素42下LCAD的过化.
- 过度乙化LCAD降低了它的酶活性.
- 缺少SIRT3的小鼠表现出禁食诱导的脂肪酸氧化障碍的特征,包括减少ATP和冷不耐受.
结论:
- 乙化是线粒体脂肪酸氧化的一个新型调节机制.
- 在禁食期间,SIRT3在调节线粒体中间代谢和脂肪酸利用方面发挥着至关重要的作用.
- 在禁食期间,SIRT3介导的LCAD脱乙化对于维持代谢平衡至关重要.
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