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    • 1. 发明授权
    • Use of gram-positive bacteria to express recombinant proteins
    • 使用革兰氏阳性细菌表达重组蛋白
    • US5821088A
    • 1998-10-13
    • US472244
    • 1995-06-07
    • Aldis DarzinsStephen WhiteheadDennis HrubyVincent A. Fischetti
    • Aldis DarzinsStephen WhiteheadDennis HrubyVincent A. Fischetti
    • C12N15/09A61K38/00A61K39/00C07K14/31C07K14/315C12N15/62C12N15/74C12P21/02C12R1/46C12P21/04
    • C07K14/31C07K14/315C12N15/62C12N15/74A61K38/00A61K39/00C07K2319/00C07K2319/02C07K2319/035C07K2319/23C07K2319/50C07K2319/705C07K2319/735
    • A novel system for cloning and expression of genes in gram-positive bacteria. The expression system is based on the finding that many gram-positive bacteria sort proteins to their cell surface through cis-acting N-terminal signal sequences and C-terminal anchor regions. In particular, the cell sorting signals of the streptococcal M6 protein, a well-known surface molecule, are used to construct a gram-positive expression system, designated SPEX (Streptococcal Protein Expression). Expression is achieved by cloning the gene of interest into an appropriate SPEX cassette which is then stably introduced into a bacterial host, such as the human commensal Streptococcus gordonii. Depending on the SPEX vector used, recombinant proteins can be anchored to the cell wall prior to release by specific endoproteolytic cleavage or secreted into the culture medium during bacterial growth. The use of host bacteria lacking extracellular proteases should protect secreted proteins from proteolytic degradation. Several expression vectors in this system also produce specifically-tagged recombinant proteins which allows for a one-step purification of the resulting product.
    • 用于克隆和表达革兰氏阳性菌中基因的新系统。 表达系统基于许多革兰氏阳性细菌通过顺式作用的N末端信号序列和C末端锚定区域将蛋白质分解到其细胞表面的发现。 特别地,使用众所周知的表面分子的链球菌M6蛋白的细胞分选信号来构建称为SPEX(链球菌蛋白表达)的革兰氏阳性表达系统。 通过将感兴趣的基因克隆到适当的SPEX盒中,然后将其稳定地导入细菌宿主例如人共生型链球菌(Streptococcus gordonii)中来实现表达。 根据所使用的SPEX载体,重组蛋白质可以在通过特异性内切蛋白酶切割释放之前锚定到细胞壁上,或者在细菌生长过程中分泌到培养基中。 缺乏细胞外蛋白酶的宿主细菌的使用应保护分泌的蛋白质免于蛋白水解降解。 该系统中的几种表达载体也产生特异性标记的重组蛋白,其允许对所得产物进行一步纯化。
    • 4. 发明申请
    • Intergenic and intragenic integration sites for foreign gene expression in recombinant S. gordonii strains
    • 外源基因表达在重组的戈登假单胞菌菌株中的基因和基因内整合位点
    • US20050042756A1
    • 2005-02-24
    • US10698439
    • 2003-11-03
    • Christine FrankeTove BolkenKevin JonesDennis Hruby
    • Christine FrankeTove BolkenKevin JonesDennis Hruby
    • C12N1/21C12N15/74
    • C12N15/74C12N15/746
    • The present invention provides two new chromosomal integration sites for expression of foreign genes have been developed in Streptococcus gordonii (S. gordonii). One integration site is intergenic between orfA and orfB in an operon of unknown function. The other site is intragenic within the lacG gene, which encodes phospho-β-galactosidase, and is part of the lactose (lac) operon. The emm6 gene from Streptococcus pyogenes was integrated in a stable configuration into the chromosome of S. gordonii at each of these integration sites, and in both cases the recombinant bacteria expressed the M6 protein on their surface. Furthermore, expression from the lacG site within the lactose operon was shown to be regulated by growth on lactose. Identification of these new chromosomal insertion sites provides the ability to express multiple foreign genes from the same recombinant and the potential for modulating expression in vitro or in vivo by the use of a biosynthetic metabolite.
    • 本发明提供了两种新的染色体整合位点,用于在链球菌(S.gordonii)中表达外源基因。 一个整合位点是orfA和orfB在功能未知的操纵子之间的基因。 另一个位点是lacG基因内部的基因,其编码磷酸-β-半乳糖苷酶,并且是乳糖(lac)操纵子的一部分。 来自化脓性链球菌的emm6基因在这些整合位点的每一个整合到稳定的构型中,并且在这两种情况下,重组细菌在其表面上表达M6蛋白。 此外,乳糖操纵子内的lacG位点的表达显示出受乳糖生长的调节。 这些新的染色体插入位点的鉴定提供了从相同的重组体表达多个外来基因并通过使用生物合成代谢物在体外或体内调节表达的潜力的能力。