PNAS |北大肖俊宇研究组和高宁研究组合作解析人源线粒体三功能酶复合物的冷冻电镜结构

2018-06-23 北大生命科学学院 细胞

北京大学生命科学学院、北大清华联合中心肖俊宇课题组与高宁课题组合作在PNAS上在线发表了题为“Cryo-EM structure of human mitochondrial trifunctional protein” 的研究论文。

北京大学生命科学学院、北大清华联合中心肖俊宇课题组与高宁课题组合作在PNAS上在线发表了题为“Cryo-EM structure of human mitochondrial trifunctional protein” 的研究论文。


A.     TFP三功能酶催化脂肪酸b-氧化过程中的三步反应。
B.      人源TFP四聚体电镜结构。

脂肪是人体内的重要能量来源,而脂肪酸b-氧化是脂肪被分解代谢进行氧化功能的最主要途径。线粒体三功能酶在该通路中发挥关键催化作用,负责催化b-氧化四步反应中的三步,即长链脂肪酸的水合反应、脱氢反应和硫解反应。在人体中,线粒体三功能酶异常会引起脂肪代谢紊乱进而造成妊娠期急性脂肪肝等致死性疾病,但人源线粒体三功能酶复合物的结构至今为止尚未被解析。

肖俊宇课题组和高宁课题组合作,利用冷冻电镜单颗粒三维重构技术,通过对蛋白纯化和电镜制样条件进行筛选和优化,最终首次解析了人源线粒体三功能酶近原子分辨率的冷冻电镜结构。

研究表明,人源TFP复合物主要呈现a2b2四聚体的状态,虽然已有文献和生化教科书多数认为其为八聚体。四聚体中a亚基和b亚基之间的组装形式与之前报道的原核同源复合物中情况截然不同,显示了真核与原核TFP复合物在催化过程中有着不同的底物传递路径。结构进一步揭示了b亚基中的一个高等真核生物所特有的插入区域。该区域富含正电氨基酸,可能参与和线粒体内膜的相互作用。生化研究表明去掉该片段显着影响b亚基和脂质体的结合及在线粒体膜上的定位,验证了该插入区域在TFP复合物与膜结合中的功能。文章进一步对大量已报道的TFP亚基突变进行了统计分析,结合结构信息对部分突变氨基酸致病的分子机制进行了阐述,为探寻三功能酶缺陷症及脂肪代谢紊乱等病的分子机理奠定了基础。

北京大学生命科学学院、北大清华生命科学联合中心肖俊宇研究员为该论文的通讯作者。分子医学研究所的陈晓伟研究员和化学与分子工程学院的王初研究员为该研究提供了重要的技术支持。北京大学前沿交叉学科研究院14级博士生梁凯以及生命科学学院博士后李宁宁为该论文的共同第一作者。陈晓伟课题组的博士生王潇、王初课题组的博士后戴建业、生科院17级博士生刘谱蓝参与了该课题的研究。该项研究得到了蛋白质与植物基因研究国家重点实验室、北大清华生命科学联合中心、国家重点研发计划、以及国家自然科学基金的支持。

原始出处:
Liang K, Li N, Wang X,et al.Cryo-EM structure of human mitochondrial trifunctional protein.Proc Natl Acad Sci U S A. 2018 Jun 18. pii: 201801252. doi: 10.1073/pnas.1801252115. [Epub ahead of print]

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    2019-04-16 hongbochen
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    2018-09-13 drwjr

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