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    • 4. 发明授权
    • Recombinant DNA cloning vectors and the eukaryotic and prokaryotic
transformants thereof
    • 重组DNA克隆载体及其真核和原核转化体
    • US4727028A
    • 1988-02-23
    • US538051
    • 1983-09-30
    • Robert F. SanterreRamachandra N. Rao
    • Robert F. SanterreRamachandra N. Rao
    • C12N15/00C12N5/00C07H21/04C12N1/00C12N1/14C12N1/16C12N1/20C12N9/12C12P19/34C12P21/00
    • C12N15/00
    • The present invention comprises novel recombinant DNA cloning and expression vectors which confer hygromycin B and/or G418 resistance to eukaryotic and prokaryotic host cells. The novel recombinant DNA vectors are derived from plasmid pKC203, a plasmid which can be isolated from E. coli JR225 (ATCC 31912). The hygromycin B and G418 resistance-conferring genes can be isolated on the 7.5 kb BglII restriction fragment or the 2.5 kb SalI-BglII restriction fragment of plasmid pKC203. The eukaryotic recombinant DNA vectors of the present invention are prepared by inserting such resistance-conferring restriction fragments into a vector, such as plasmid pSV5gpt, that comprises a eukaryotic promoter and the necessary functions for maintenance of the vector as an extrachromosomal element or as an integrated sequence in the host cell chromosomal DNA. Furthermore, the present invention comprises useful derivatives of plasmid pKC203 which, although comprising no eukaryotic elements, are useful recombinant vectors for E. coli and other prokaryotes and serve as starting material for the construction of eukaryotic vectors that confer hygromycin B and/or G418 resistance to eukaryotic host cells. One useful derivative of plasmid pKC203 is constructed by circularizing the .about.7.5 kb BglIII restriction fragment of plasmid pKC203 to form plasmid pSC701, which can be further digested with HaeII or SauIIIA1 to form smaller plasmids. The present invention also comprises the novel transformants of the aforementioned recombinant DNA vectors.
    • 本发明包括赋予真核细胞和原核宿主细胞的潮霉素B和/或G418抗性的新型重组DNA克隆和表达载体。 新型重组DNA载体衍生自质粒pKC203,该质粒可从大肠杆菌JR225(ATCC 31912)中分离。 可以在质粒pKC203的7.5kb BglII限制性片段或2.5kb SalI-BglII限制性片段上分离潮霉素B和G418抗性赋予基因。 本发明的真核重组DNA载体是通过将这种产生抗性的限制性片段插入到包含真核启动子的载体(例如质粒pSV5gpt)中,以及维持作为染色体外元件的载体的必需功能 宿主细胞染色体DNA序列。 此外,本发明包括质粒pKC203的有用衍生物,其虽然不含真核生物元件,但是是用于大肠杆菌和其他原核生物的有用的重组载体,并且用作构建赋予潮霉素B和/或G418抗性的真核载体的起始材料 到真核宿主细胞。 通过使质粒pKC203的DIFFERENCE 7.5kb BglIII限制性片段环化形成质粒pSC701构建质粒pKC203的一个有用的衍生物,其可以用HaeII或SauIIIA1进一步消化以形成较小的质粒。 本发明还包括上述重组DNA载体的新型转化体。