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    • 4. 发明申请
    • Enhanced production of recombinant proteins by transient transfection of suspension-growing mammalian cells
    • 通过瞬时转染悬浮培养的哺乳动物细胞增强重组蛋白的产生
    • US20050170450A1
    • 2005-08-04
    • US10477148
    • 2002-05-07
    • Yves DurocherSylvie PerretPhuong PhamAmine Kamen
    • Yves DurocherSylvie PerretPhuong PhamAmine Kamen
    • C12N5/071C12N15/85C12P21/02C12P21/06C12N5/08
    • Disclosed is a new process for the production of recombinant proteins, by transient transfection of suspension-grown human embryonic kidney cells (293 cell line and its genetic variants) with an expression vector, using polyethylenimine (PEI) as a transfection reagent. In a preferred embodiment, the process uses 293E cells expressing the Epstein-Barr virus (EBV) EBNA 1 protein, in combination with an oriP-based episomal expression vector having an improved cytomegalovirus expression cassette comprising the CMV5 promoter. The process combines in a single step the cell growth, transfection and protein expression, is carried out without changing the culture medium, and allows to achieve high expression levels in a short period of time. The process may be carried out in a serum-free, low-protein culture medium, is easily scalable, compatible with continuous production processes, and fully adapted to high-throughput production of milligram quantities of recombinant proteins.
    • 公开了通过使用聚乙烯亚胺(PEI)作为转染试剂用表达载体瞬时转染悬浮培养的人胚胎肾细胞(293细胞系及其遗传变体)来生产重组蛋白质的新方法。 在优选的实施方案中,该方法使用表达爱泼斯坦 - 巴尔病毒(EBV)EBNA 1蛋白的293E细胞与具有包含CMV5启动子的改良的巨细胞病毒表达盒的基于oriP的附加型表达载体的组合。 该过程在一个步骤中结合细胞生长,转染和蛋白质表达,不改变培养基进行,并允许在短时间内达到高表达水平。 该方法可以在无血清的低蛋白培养基中进行,易于扩展,与连续生产过程相容,并且完全适应于高产量的毫克量的重组蛋白质。