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    • 6. 发明授权
    • Process for producing peptides in E. coli
    • 在大肠杆菌中生产肽的方法
    • US5670340A
    • 1997-09-23
    • US352179
    • 1994-12-05
    • Masayuki YabutaYuji SuzukiKazuhiro OhsuyeTakehiro OshimaSeiko OnaiKoji MagotaShoji Tanaka
    • Masayuki YabutaYuji SuzukiKazuhiro OhsuyeTakehiro OshimaSeiko OnaiKoji MagotaShoji Tanaka
    • C12N15/09C07K14/58C07K14/585C12N9/38C12N15/16C12N15/62C12N15/67C12N15/70C12P21/02C12P21/06C12R1/19C12P21/00
    • C07K14/58C07K14/585C12N15/62C12N9/2471C12Y302/01023C07K2319/00C07K2319/23C07K2319/43C07K2319/50C07K2319/75C07K2319/90
    • The present invention is a process to express a target peptide in a large amount and accumulate the target peptide in host cells in the form of inclusion bodies. The process comprises: A) culturing host cells transformed with a plasmid able to express a gene coding for a fusion protein represented in the formula A--L--B, wherein B is a target peptide, A is a protective peptide comprising a 90-210 amino acid fragment E. coli .beta.-galactosidase, and L is a linker peptide positioned between the C-terminus of the protective peptide and the N-terminus of the target peptide and selected so that when the fusion protein is treated by an enzyme or chemical substance, the target peptide is separated, and wherein the protective peptide and linker peptide are selected so that the isoelectric point of the fusion protein in between 4.9 and 6.9; B) obtaining an insoluble fraction comprising inclusion bodies by homogenization of th cultured transformed cells; C) solubilizing the fusion protein in the inclusion bodies by treatment of the insoluble fraction with a solubilizing agent; and, D) cleaving the peptide bond between the C-terminus of the linker peptide and the N-terminus of the target peptide of the solubilized fusion protein to release the target peptide from the other peptides followed by purification of the target peptide.
    • 本发明是大量表达目标肽并以包涵体的形式在宿主细胞中聚集靶肽的方法。 该方法包括:A)培养用能够表达编码式ALB中表示的融合蛋白的基因的质粒转化的宿主细胞,其中B是靶肽,A是包含90-210个氨基酸片段E的保护肽 大肠杆菌β-半乳糖苷酶,L是位于保护肽的C-末端和靶肽的N末端之间的连接肽,并且被选择使得当融合蛋白被酶或化学物质处理时,靶 分离肽,并且其中选择保护性肽和接头肽,使得融合蛋白的等电点在4.9和6.9之间; B)通过均质培养的转化细胞获得包含包含体的不溶性级分; C)通过用增溶剂处理不溶性级分将融合蛋白溶解在包涵体中; 并且D)切割接头肽的C末端和溶解的融合蛋白的靶肽的N末端之间的肽键,从其他肽释放靶肽,然后纯化目标肽。