对大肠杆菌中表达蛋白质精氨酸甲基转移酶5的几个缺失突变体的活性研究(英文)  

Study on Biological Activity of Various Truncations of Human PRMT5 in E. coli

作　　者：孙力涛[1,2] 周忠卫[2] 谢小东[1] 鲍时来[2] 

机构地区：[1]兰州大学生命科学学院,兰州730000 [2]中国科学院遗传与发育学研究所,分子发育生物学重点实验室,北京100101

出　　处：《生物化学与生物物理进展》2008年第7期801-806,共6页Progress In Biochemistry and Biophysics

基　　金：国家自然科学基金资助项目(30371745, 30670479)~~

摘　　要：蛋白质精氨酸甲基转移酶5(PRMT5)在细胞生长和信号转导方面是一个重要的调节因子,主要参与染色质重塑、RNA剪切、基因转录、细胞分化等过程.因此,对其结构和功能的研究就显得十分重要.通过大肠杆菌表达系统把全长基因PRMT5构建到pGEX-4T-1表达载体上,所得到GST标签的重组蛋白可溶性很低.为此,通过在其N端缺失不同氨基酸序列来增加其表达量,而且其中有一个缺失突变体的活性并没有发生改变.同时,还发现PRMT5N端的前15个氨基酸对其甲基转移酶的催化活性很重要.Protein arginine methyltransferase 5 （PRMT5） has been implicated as an important regulator of many cellular processes and signaling pathways, including chromatin remodeling, RNA splicing, DNA transcription, and cell proliferation. Therefore, structural and functional studies on PRMT5 are quite important. The full length ofPRMT5 gene was cloned into vector pGEX-4T-1, resulting in only low expression levels in Escherichia coli （E. coli）. Here, it was showed that the several N-terminal amino acids deletions could result in a significant increase in the amount of soluble fraction, while one of them did not affect the protein-arginine methyltransferase activity. And it was also found that the N-terminal 15 amino acids region of PRMT5 may be important for the catalytic activity.

关 键 词：PRMT5 表达 纯化 甲基转移酶活性 

分 类 号：Q78[生物学—分子生物学]