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    • 25. 发明授权
    • Regulated antigen delivery system (RADS)
    • 调节抗原递送系统(RADS)
    • US07341860B2
    • 2008-03-11
    • US10924574
    • 2004-08-24
    • Roy Curtiss, IIISteven A. Tinge
    • Roy Curtiss, IIISteven A. Tinge
    • C12N1/20C12P21/06
    • C12N15/74A61K2039/523A61K2039/53C12N15/635
    • We describe a regulated antigen delivery system (RADS) that has (a) a vector that includes (1) a gene encoding a desired gene product operably linked to a control sequence, (2) an origin of replication conferring vector replication using DNA polymerase III, and (3) an origin of replication conferring vector replication using DNA polymerase I, where the second origin of replication is operably linked to a control sequence that is repressible by a repressor. The RADS microorganism also has a gene encoding a repressor, operably linked to an activatible control sequence. The RADS described provide high levels of the desired gene product after repression of the high copy number origin of replication is lifted. The RADS are particularly useful as live bacterial vaccines. Also described is a delayed RADS system, in which there is a delay before the high copy number origin is expressed after the repression is lifted. The delayed RADS is also particularly useful for live bacterial vaccines. Also described are several control elements useful for these systems, as well as methods for providing immunity to a pathogen in a vertebrate immunized with the RADS microorganisms.
    • 我们描述了一种调控抗原递送系统(RADS),其具有(a)载体,其包含(1)编码与控制序列可操作地连接的所需基因产物的基因,(2)使用DNA聚合酶III赋予载体复制的复制起点 ,和(3)使用DNA聚合酶I赋予载体复制的复制起点,其中第二复制起点可操作地连接于由阻遏物阻抑的控制序列。 RADS微生物还具有编码阻抑物的基因,可操作地连接于活化的对照序列。 所述的RADS提供高水平的所需基因产物,在抑制高拷贝数复制起点解除之后。 RADS作为活细菌疫苗是特别有用的。 还描述了延迟的RADS系统,其中在压制被解除之后表示高拷贝数原点之前存在延迟。 延迟RADS对活细菌疫苗也特别有用。 还描述了可用于这些系统的若干控制元件,以及用于用RADS微生物免疫的脊椎动物中的病原体提供免疫的方法。
    • 26. 发明授权
    • Selective maintenance of a recombinant gene in a population of vaccine
cells
    • 在疫苗细胞群中选择性维持重组基因
    • US5672345A
    • 1997-09-30
    • US402308
    • 1995-03-10
    • Roy Curtiss, III
    • Roy Curtiss, III
    • C12N15/09A61K39/04C07K14/315C07K14/35C12N1/21C12N9/02C12N15/00C12N15/68C12R1/01C12R1/19C12R1/42C12R1/44A61K39/02C12P21/00
    • C12N9/0008A61K39/04C07K14/315C07K14/35C12N15/00C12N15/68C12R1/42C12Y102/01011A61K2039/523
    • The invention encompasses methods of maintaining desired recombinant genes in a genetic population of cells expressing the recombinant gene. The methods utilize mutant cells which are characterized by a lack of a functioning native gene encoding an enzyme which is essential for cell survival, wherein this enzyme catalyzes a step in the biosynthesis of an essential cell wall structural component and the presence of a first recombinant gene encoding an enzyme which is a functional replacement for the native enzyme, wherein the first recombinant gene cannot replace the defective chromosomal gene. The first recombinant gene is structurally linked to a second recombinant gene encoding a desired product. Loss of the first recombinant gene causes the cells to lyse when the cells are in an environment where a product due to the expression of the first recombinant gene is absent. The invention also encompasses methods of creating and isolating mutant cells with the above characteristics. The cells of the invention are useful for commercial production of desired products, for components of vaccines for immunizing individuals, and for release into the environment.
    • 本发明包括在表达重组基因的细胞的遗传群体中维持所需重组基因的方法。 该方法利用突变体细胞,其特征在于缺乏编码细胞存活所必需的酶的功能性天然基因,其中该酶催化必需细胞壁结构组分的生物合成和第一重组基因的存在 编码作为天然酶的功能性替代物的酶,其中第一重组基因不能代替有缺陷的染色体基因。 第一重组基因在结构上与编码所需产物的第二重组基因连接。 当细胞处于不存在第一重组基因表达的产物的环境中时,第一重组基因的损失导致细胞裂解。 本发明还包括产生和分离具有上述特征的突变细胞的方法。 本发明的细胞可用于商业生产所需产品,用于免疫个体的疫苗的组分和用于释放到环境中。
    • 28. 发明授权
    • Modified microorganisms and method of preparing and using same
    • US4190495A
    • 1980-02-26
    • US727365
    • 1976-09-27
    • Roy Curtiss, III
    • Roy Curtiss, III
    • C02F3/34C12N1/20C12N15/00C12N15/09C12P1/00C12R1/19C12K1/02
    • C12N15/00Y02W10/37Y10S435/849
    • Microorganisms have been developed which may be characterized as possessing substantially all of the following qualities or capabilities:(a) capable of having foreign genetic information introduced thereinto and recovered therefrom along with its expression with production of useful gene products;(b) the microorganism being dependent for growth and survival upon defined conditions;(c) the microorganism being incapable of establishment or growth or colonization and/or survival under conditions or in ecological niches that are considered to be natural and/or undesirable for said microorganism;(d) the microorganism being capable of causing genetic information incorporated therein to undergo degradation under conditions or ecological niches that are considered to be natural and/or undesirable for said microorganism;(e) the microorganism being capable of permitting cloning vectors incorporated therein to be dependent for their replication, maintenance and/or function on said microorganism;(f) the microorganism being substantially incapable of transmitting cloning vectors or recombinant DNA molecules incorporated therein to other organisms under conditions or ecological niches that are considered to be natural and/or undesirable for said microorganism;(g) the microorganism being capable of being monitored by suitable means and/or techniques without substantial alteration of said microorganism; and(h) the microorganism being susceptible of substantially minimal contamination with other organisms when recombinant DNA molecules are incorporated therein and being substantially incapable of contaminating other organisms when incorporated therein or consumed thereby when recombinant DNA molecules are incorporated in said microorganism.Examples of such microorganisms are Escherichia coli K-12 .chi.1776, Escherichia coli K-12 .chi.1972, Escherichia coli K-12 .chi.1976 and Escherichia coli K-12 .chi.2076. Additionally, techniques have been developed and employed for imparting special properties, e.g. genetic properties, to microorganisms which render the resulting microorganisms unique. Also, techniques have been developed for the handling of plasmid and/or bacteriophage cloning DNA vectors for eventual insertion into microorganisms for testing therein, such as the above-mentioned microorganisms, and techniques have been developed for the transformation of microorganisms, such as the above-identified microorganisms, for the introduction of recombinant DNA molecules thereinto. Also, techniques have been developed in connection with the development or production of the above-identified microorganisms which impart special genetically-linked properties thereto, which techniques are applicable to a large number and diversity of microorganisms, including not only bacteria but also yeast and other cellular material.