遗传 ›› 2003, Vol. 25 ›› Issue (4): 383-387.

• 论文 • 上一篇    下一篇

人线粒体tRNALeu(UUR)基因A3243G点突变对其亮氨酰化活性的影响

汪振诚1;2;王学敏2;金由辛1;缪明永2;韩伟国1;焦炳华2 WANG Zhen-Cheng1;2;WANG Xue-Min2;JIN You-Xin1;MIAO Ming-Yong2;HAN Wei-Guo1;JIAO Bing-Hua2   

  1. 1.中国科学院上海生命科学院生物化学与细胞生物学研究所 分子生物学国家重点实验室,上海 200031; 2.第二军医大学基础医学部生物化学与分子生物学教研室,上海 200433 1.State Key Laboratory of Molecular Biology,Institute of Biochemistry and Cell Biology, Shanghai Institute for Biological Sciences,Chinese Academy of Sciences,Shanghai,200031,China; 2.Department of Basic Medicine,Department of Biochemistry and Molecular Biology,Secondary Military Medical University,Shanghai 200433,China
  • 收稿日期:1900-01-01 出版日期:2003-08-10 发布日期:2003-08-10

Effects of A3243G Point Mutation on Aminoacylation of Human Mitochondrial tRNALeu(UUR)

  • Received:1900-01-01 Online:2003-08-10 Published:2003-08-10

摘要: 化学法合成人线粒体野生型与A3243G点突变型tRNALeu(UUR)基因,体外转录生成相应的tRNALeu(UUR),表达并纯化人线粒体亮氨酰tRNA合成酶(mtLeuRS),用mtLeuRS催化野生型与突变型tRNALeu(UUR)与亮氨酸结合,分别检测两种类型tRNALeu(UUR)的氨酰化动力学常数。结果表明,野生型tRNALeu(UUR)的Km/Kcat仅为突变型tRNALeu(UUR)的63.9%,A3243G点突变使tRNALeu(UUR)接受亮氨酸的能力明显下降,提示此为A3243G点突变致病机制之一。
Abstract:The wild-type and mutant-type human mitochondrial tRNALeu(UUR) genes were synthesized and transcribed in vitro with T7 RNA polymerase.The kinetic parameters of human mitochondrial leucyl-tRNA synthetase(mtLeuRS) were determined with wild-type and mutant-type human mitochondrial tRNALeu(UUR) respectively.The results show that the value of Km/Kcat of mtLeuRS for the mutant-type tRNALeu(UUR) is 63.9% as compared with the wild-type.Human mitochondrial tRNALeu(UUR) gene A3243G point mutant can remarkably reduce it′s aminoacylation activity,suggesting it would be one of the mechanisms that the mutation could produce such clinical phenotypes.

关键词: 异代换种质, 多色基因组原位杂交, 玉米, 四倍体多年生玉米种, A3243G点突变, 人线粒体tRNALeu(UUR), 人线粒体亮氨酰tRNA结合酶
Key words,
体外转录, 氨酰化

Key words: substituted material, multi-color genome in situ hybridization(McGISH), maize, Z.perennis