高等学校化学学报 ›› 2016, Vol. 37 ›› Issue (5): 912.doi: 10.7503/cjcu20150817
收稿日期:
2015-10-23
出版日期:
2016-05-10
发布日期:
2016-04-18
作者简介:
联系人简介: 郑积敏, 男, 博士, 教授, 博士生导师, 主要从事磷酸化蛋白质及钙调蛋白的结构与功能研究. E-mail:基金资助:
WANG Nan1, CHENG Xiaoheng2, ZHENG Jimin1,*(), CHEN Guangju1, JIA Zongchao3
Received:
2015-10-23
Online:
2016-05-10
Published:
2016-04-18
Contact:
ZHENG Jimin
E-mail:jimin_z@bnu.edu.cn
Supported by:
摘要:
测试并优化了哺乳动物雷帕霉素靶蛋白(mTOR)的FAT结构域及其亚结构域TRD2和DEPTOR蛋白在大肠杆菌中的表达条件, 获得了TRD2和DEPTOR蛋白成功表达并大量纯化的条件. 结果表明, 麦芽糖结合蛋白(MBP)融合mTOR的TRD2亚结构域可以在菌株BL21(DE3)中大量表达. DEPTOR-G270P突变比野生型DEPTOR在BL21(DE3)中的表达量提高约5倍, 且该突变并不影响DEPTOR自身的二级结构. 通过凝胶过滤实验发现, mTOR的TRD2亚结构域和DEPTOR之间可能存在相互作用.
中图分类号:
TrendMD:
王男, 程小桁, 郑积敏, 陈光巨, 贾宗超. DEPTOR蛋白的表达纯化条件及与mTOR-TRD2亚结构域的相互作用. 高等学校化学学报, 2016, 37(5): 912.
WANG Nan, CHENG Xiaoheng, ZHENG Jimin, CHEN Guangju, JIA Zongchao. Expression and Purification of DEPTOR and Its Interaction with mTOR-TRD2†. Chem. J. Chinese Universities, 2016, 37(5): 912.
Primer name | Sequence(5' to 3') |
---|---|
FAT foward primer | CTGCTGGGTGAGAGAGCT |
FAT reverse primer | AGACTTAGAAGCCACTGTCAGT |
TRD2 forward primer | ATCCAGGCTACCTGGTATGA |
TRD2 reverse primer | CTTGTCCCCGAGCGAC |
Table 1 FAT domain and TRD2 subdomain PCR primer sequence
Primer name | Sequence(5' to 3') |
---|---|
FAT foward primer | CTGCTGGGTGAGAGAGCT |
FAT reverse primer | AGACTTAGAAGCCACTGTCAGT |
TRD2 forward primer | ATCCAGGCTACCTGGTATGA |
TRD2 reverse primer | CTTGTCCCCGAGCGAC |
Primer name | Sequence(5' to 3') |
---|---|
DEPTOR foward primer | GCTTGGTACCGAGCTCGG |
DEPTOR reverse primer | ATGGTGATGGTGATGATG |
DEPTOR-G270P-forward | GGCAGCAGCCCCTACTTCAGCAGCAGCCCCACCC |
DEPTOR-G270P-reverse | TGAAGTAGGGGCTGCTGCCACAGCTGCTCATGCTGCTTCT |
Table 2 DEPTOR PCR Primer and G270P Mutation Primer Sequence
Primer name | Sequence(5' to 3') |
---|---|
DEPTOR foward primer | GCTTGGTACCGAGCTCGG |
DEPTOR reverse primer | ATGGTGATGGTGATGATG |
DEPTOR-G270P-forward | GGCAGCAGCCCCTACTTCAGCAGCAGCCCCACCC |
DEPTOR-G270P-reverse | TGAAGTAGGGGCTGCTGCCACAGCTGCTCATGCTGCTTCT |
Fig.2 FAT domain and subdomain expression assay in E.coli(A) FAT-GST fusion protein in JM109 expression assay by Western-Blot, lane 1: negative control (incubate without adding IPTG), lane 2: whole-cell-extract after induced by 1 mmol/L IPTG, lanes 3, 4: supernatant/pellet of whole-cell-extract lysate. (B) MBP fusion TRD2 protein in BL21(DE3) expression assay by SDS-PAGE(Ft: flow-through; W: wash; E: eluted protein).
Fig.3 DEPTOR expression assay in E.coliAll the lanes are samples from each purification step, respectively. (A) DEPTOR-His wild-type expression assay by Western-Blot in BL21(DE3); (B) DEPTOR-His wild-type expression assay by Western-Blot in arctic express; (C) DEPTOR-His wild-type expression assay by SDS-PAGE in BL21(DE3); (D) DEPTOR-His G270P expression assay by SDS-PAGE; (E) DEPTOR-His G270P expression assay by SDS-PAGE with glycerol(10%, volume fraction) in purification buffer. P: pellet; S: supernatant; Cell: whole-cell-extract; Control: cell without induced by IPTG; Ft: flow-through; W1, W2: wash; E, E1 and E2: eluted protein; R: resin after elution.
Secondary structure | Percentage of secondary structure(%) | |||||
---|---|---|---|---|---|---|
180—260 nm | 185—260 nm | 190—260 nm | 195—260 nm | 200—260 nm | 205—260 nm | |
α-Helix | 29.1 | 28.8 | 28.8 | 27.8 | 26.7 | 27.6 |
Antiparallel β-strand | 14.2 | 14.6 | 15.0 | 13.4 | 11.0 | 9.4 |
Parallel β-strand | 9.1 | 9.0 | 8.9 | 9.8 | 10.5 | 10.9 |
β-Turns | 18.3 | 18.3 | 18.2 | 18.1 | 18.4 | 17.8 |
Coiled-coil | 31.8 | 32.2 | 31.8 | 33.6 | 35.9 | 37.7 |
Total | 102.4 | 102.9 | 102.8 | 102.7 | 102.5 | 103.3 |
Table 3 Percentage of secondary structure in DEPTOR-wt*
Secondary structure | Percentage of secondary structure(%) | |||||
---|---|---|---|---|---|---|
180—260 nm | 185—260 nm | 190—260 nm | 195—260 nm | 200—260 nm | 205—260 nm | |
α-Helix | 29.1 | 28.8 | 28.8 | 27.8 | 26.7 | 27.6 |
Antiparallel β-strand | 14.2 | 14.6 | 15.0 | 13.4 | 11.0 | 9.4 |
Parallel β-strand | 9.1 | 9.0 | 8.9 | 9.8 | 10.5 | 10.9 |
β-Turns | 18.3 | 18.3 | 18.2 | 18.1 | 18.4 | 17.8 |
Coiled-coil | 31.8 | 32.2 | 31.8 | 33.6 | 35.9 | 37.7 |
Total | 102.4 | 102.9 | 102.8 | 102.7 | 102.5 | 103.3 |
Secondary structure | Percentage of secondary structure(%) | |||||
---|---|---|---|---|---|---|
180—260 nm | 185—260 nm | 190—260 nm | 195—260 nm | 200—260 nm | 205—260 nm | |
α-Helix | 28.8 | 29.4 | 29.3 | 28.6 | 28.0 | 29.4 |
Antiparallel β-strand | 14.9 | 14.2 | 14.7 | 12.9 | 10.5 | 8.8 |
Parallel β-strand | 9.1 | 8.8 | 8.7 | 9.5 | 10.0 | 10.3 |
β-Turns | 18.4 | 18.2 | 18.1 | 17.9 | 18.1 | 17.4 |
Coiled-coil | 31.0 | 31.2 | 31.0 | 32.6 | 34.7 | 36.2 |
Total | 102.2 | 101.8 | 101.9 | 101.6 | 101.3 | 102.1 |
Table 4 Percentage of secondary structure in DEPTOR-G270P*
Secondary structure | Percentage of secondary structure(%) | |||||
---|---|---|---|---|---|---|
180—260 nm | 185—260 nm | 190—260 nm | 195—260 nm | 200—260 nm | 205—260 nm | |
α-Helix | 28.8 | 29.4 | 29.3 | 28.6 | 28.0 | 29.4 |
Antiparallel β-strand | 14.9 | 14.2 | 14.7 | 12.9 | 10.5 | 8.8 |
Parallel β-strand | 9.1 | 8.8 | 8.7 | 9.5 | 10.0 | 10.3 |
β-Turns | 18.4 | 18.2 | 18.1 | 17.9 | 18.1 | 17.4 |
Coiled-coil | 31.0 | 31.2 | 31.0 | 32.6 | 34.7 | 36.2 |
Total | 102.2 | 101.8 | 101.9 | 101.6 | 101.3 | 102.1 |
Fig.5 Interaction assay of MBP-TRD2 and DEPTOR(A) MBP-TRD2 and DEPTOR co-purification by gel-filtration (Hi-Load S200) in 20 mmol/L Tris, pH=8.0 and 150 mmol/L NaCl; (B) MBP and DEPTOR co-purification by gel-filtration in the same condition as a negative control. Samples of the putative complexes are picked and analyzed by SDS-PAGE. In each figure, x-axis indicates the elution volume which reflects molecular mass of the protein and y-axis indicates the absorption value which is in direct proportion to protein concentration.
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