Preliminary molecular characterization and crystallization of mitochondrial respiratory complex II from porcine heart

作者：Xia Huo, Dan Su, Aojin Wang, Yujia Zhai, Jian-Xing Xu, Xuemei Li, Mark Bartlam, Fei Sun, Zihe Rao · 发表于：FEBS Journal · 年份：2007 · DOI：10.1111/j.1742-4658.2007.05698.x · 被引用次数：10 · 研究领域：Mitochondrial Function and Pathology、ATP Synthase and ATPases Research、Cancer, Hypoxia, and Metabolism

The mitochondrial respiratory complex II, or succinate:ubiquinone oxidoreductase, is an integral membrane protein complex in both the tricarboxylic acid cycle (Krebs cycle) and aerobic respiration. The gene sequences of each complex II subunit were measured by RT-PCR. N-terminal sequencing work was performed to identify the mitochondrial targeting signal peptide of each subunit. Complex II was extracted from porcine heart and purified by the ammonium sulfate precipitation method. The sample was solubilized by 0.5% (w/v) sugar detergent n-decyl-beta-D-maltoside, stabilized by 200 mM sucrose, and crystallized with 5% (w/v) poly(ethylene glycol) 4000. Important factors for the extraction, purification and crystallization of mitochondrial respiratory complex II are discussed.