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    • 7. 发明授权
    • Method for producing heterologous proteins
    • 异源蛋白质的制备方法
    • US4801536A
    • 1989-01-31
    • US57881
    • 1987-06-02
    • Mark L. StahlEdward R. LaVallie
    • Mark L. StahlEdward R. LaVallie
    • C07K14/32C07K14/62C12N15/62C12N15/90C12P21/00C12N15/00
    • C12N15/62C07K14/32C07K14/62C12N15/90C07K2319/00C07K2319/02C07K2319/036C07K2319/50C07K2319/75
    • This invention concerns a method for producing a heterologous protein in a bacterial host cell such that the protein is exported from the host cell into the culture medium. The method involves culturing in a bacterial culture medium a genetically engineered bacterial strain containing a fusion DNA sequence comprising a first nucleotide sequence encoding at least an N-terminal portion of a flagellin protein and a second nucleotide sequence encoding the heterologous protein. The first nucleotide sequence is linked via its 3' terminus to the 5' terminus of the second nucleotide sequence, and the fusion DNA sequence is itself linked to an expression control sequence. In certain embodiments the first and second nucleotide sequences are linked by means of a linking nucleotide sequence encoding a selectively cleavable polypeptide, In those embodiments the resulting exported fusion protein will contain a selectively cleavable site at which the fusion protein may be selectively cleaved by chemical or enzymatic methods to produce the heterologous protein encoded for by the second nucleotide sequence of the fusion DNA sequence. The heterologous protein may then be separately recovered from any polypeptide fragment of flagellin or other proteinaceous material.
    • 本发明涉及在细菌宿主细胞中产生异源蛋白质的方法,使得蛋白质从宿主细胞输出到培养基中。 所述方法包括在细菌培养基中培养含有融合DNA序列的遗传工程改造的细菌菌株,所述融合DNA序列包含编​​码鞭毛蛋白蛋白质的至少N末端部分的第一核苷酸序列和编码异源蛋白质的第二核苷酸序列。 第一个核苷酸序列通过其3'末端连接到第二个核苷酸序列的5'末端,并且融合DNA序列本身与表达控制序列连接。 在某些实施方案中,第一和第二核苷酸序列通过编码可选择性切割多肽的连接核苷酸序列连接。在这些实施方案中,所得出口的融合蛋白将含有可选择性切割位点,在该位点处,融合蛋白可以被化学或 用于产生由融合DNA序列的第二个核苷酸序列编码的异源蛋白质的酶学方法。 然后可以从鞭毛蛋白或其它蛋白质材料的任何多肽片段单独回收异源蛋白质。