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    • 2. 发明申请
    • METHOD FOR CONTROLLING MOLECULAR WEIGHT OF POLYHYDROXYALKANOATES
    • 控制聚羟基烷基酯分子量的方法
    • WO1998004713A1
    • 1998-02-05
    • PCT/US1997013301
    • 1997-07-25
    • MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    • MASSACHUSETTS INSTITUTE OF TECHNOLOGYSNELL, Kristi, D.HOGAN, Scott, A.SIM, Sang, JunSINSKEY, Anthony, J.RHA, Chokyun
    • C12N15/52
    • C12N9/93C12P7/625
    • A method has been developed for control of molecular weight and molecular weight dispersity during production of polyhydroxyalkanoates in genetically engineered organism by control of the level and time of expression of one or more PHA synthases in the organisms. The method was demonstrated by constructing a synthetic operon for PHA production in E. coli in which the level of PHA synthase activity could be tightly controlled by placement of the synthase behind an inducible promoter. Modulation of the total level of PHA synthase activity in the host cell by varying the concentration of the inducer, isopropyl beta -D-thiogalactoside (IPTG), was found to effect the molecular weight of the polymer produced in the cell. Specifically, high concentrations of synthase activity were found to yield polymers of low molecular weight while low concentrations of synthase activity yielded polymers of higher molecular weight. Polymer molecular weight dispersity is also proportional to the amount of synthase activity, with less dispersity in polyhydroxyalkanoate compositions produced in expression systems with an initial burst of synthase activity, and higher levels of molecular weight dispersity in polyhydroxyalkanoate compositions produced in expression systems with the levels of synthase activity varied during synthesis of the polyhydroxyalkanoate.
    • 已经开发了一种通过控制生物体内一种或多种PHA合成酶的表达水平和时间来控制在遗传工程生物体内聚羟基链烷酸酯生产过程中的分子量和分子量分散性的方法。 该方法通过在大肠杆菌中构建用于PHA生产的合成操纵子来证明,其中通过将合酶置于诱导型启动子后面可以严格控制PHA合酶活性的水平。 发现通过改变诱导剂异丙基β-D-硫代半乳糖苷(IPTG)的浓​​度来调节宿主细胞中PHA合成酶活性的总水平,从而影响细胞中产生的聚合物的分子量。 具体地说,发现高浓度的合成酶活性产生低分子量的聚合物,而低浓度的合成酶活性则产生较高分子量的聚合物。 聚合物分子量分散度也与合成酶活性的量成比例,在具有合成酶活性的初始爆发的表达系统中产生的聚羟基链烷酸酯组合物的分散性较低,并且在表达系统中产生的聚羟基链烷酸酯组合物中较高水平的分子量分散性具有 合成酶活性在聚羟基链烷酸酯的合成过程中变化。
    • 8. 发明申请
    • METHOD FOR ALTERING SURFACE CHARGE OF MICROORGANISMS
    • 改善微生物表面电荷的方法
    • WO1989009270A1
    • 1989-10-05
    • PCT/US1989001135
    • 1989-03-20
    • MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    • MASSACHUSETTS INSTITUTE OF TECHNOLOGYEASSON, Donald, D., Jr.SINSKEY, Anthony, J.PEOPLES, Oliver, P.
    • C12N15/00
    • C12N9/00C12N9/10C12P19/00
    • The present invention is a method to produce polysaccharides with altered functional groups on their surface having modified surface charge as a result of the altered functional groups. These functional groups include, but are not limited to, negatively charged pyruvyl and succinyl moieties and positively charged amino groups. The polysaccharides can be produced by either: (1) mutation and selection of organisms synthesizing polysaccharides with modified surface charge or (2) engineering of specific genes within organisms to alter the charged groups attached to the polysaccharides during synthesis. Mutation of Zoogloea ramigera polysaccharide, as measured by the change in pyruvate content, is demonstrated. The isolation, characterization and manipulation of the gene for the pyruvyl transferase enzyme, which adds pyruvyl moities to the exopolysaccharide produced by Zoogloea ramigera, leading to an exopolysaccharide having a modified surface charge, is detailed. The modified exopolysaccharides have new applications due to the differences in surface charge. The modified enzymes and sequences regulating their expression can be used to produce novel polysaccharides. Further, studies of the structural-functional relationships of the modified exopolysaccharide can lead to a better understanding of secondary and tertiary structure in polysaccharides.
    • 本发明是由于功能基团的改变而产生具有改变的表面电荷的表面上具有改变的官能团的多糖的方法。 这些官能团包括但不限于带负电荷的丙烯酰基和琥珀酰基部分和带正电荷的氨基。 多糖可以通过:(1)突变和选择具有修饰的表面电荷合成多糖的生物体,或(2)在生物体内工程化特定基因以改变在合成过程中与多糖连接的带电基团。 证明了通过丙酮酸含量变化测量的Zoogloea苎麻多糖的突变。 详细说明了分离,表征和操作丙酮酸转移酶的基因,其向由苎麻生产的外多糖添加丙酮酸,导致具有改性表面电荷的外多糖。 由于表面电荷的差异,修饰的外多糖具有新的应用。 修饰的酶和调节其表达的序列可用于产生新型多糖。 此外,修饰的外多糖的结构 - 功能关系的研究可以更好地了解多糖中的二级和三级结构。
    • 10. 发明申请
    • METHOD FOR PRODUCING NOVEL POLYESTER BIOPOLYMERS
    • 生产新型聚酯生物聚合物的方法
    • WO1989000202A2
    • 1989-01-12
    • PCT/US1988002227
    • 1988-06-27
    • MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    • MASSACHUSETTS INSTITUTE OF TECHNOLOGYPEOPLES, Oliver, P.SINSKEY, Anthony, J.
    • C12P07/62
    • C12N9/0006C12N9/00C12N9/1029C12N15/52C12P7/625
    • The present invention is a method for controlling biopolymer synthesis by determining the genetics and enzymology of polyhydroxybutyrate (PHB) biosynthesis at the molecular level. The purified enzymes and genes provide the means for developing new PHB-like biopolymers having polyester backbones. Specific aims are to 1) control the chain length of the polymers produced in fermentation processes through genetic manipulation, 2) incorporate different monomers into the polymers to produce co-polymers with different physical properties, and 3) examine the physical/rheological properties of these new biopolymers in order to develop further design criteria at the molecular level. The method for engineering biopolymer synthesis includes: isolation and characterization of the genes for the enzymes in the synthetic pathway (beta-ketothiolase, acetoacetyl-CoA reductase and PHB synthetase); cloning of the genes in a vector(s); placement of the vector(s) under the control of regulated promoters; expression of the genes; determination of the function and use of other factors such as substrate specificity in polymer production and composition; and isolation and physical and chemical analysis of the resulting polymers.
    • 本发明是通过在分子水平上测定聚羟基丁酸(PHB)生物合成的遗传学和酶学方法来控制生物聚合物合成的方法。 纯化的酶和基因为开发具有聚酯主链的新型PHB样生物聚合物提供了手段。 具体目的是1)通过遗传操作控制在发酵过程中产生的聚合物的链长,2)将不同单体引入聚合物中以产生具有不同物理性质的共聚物,和3)检查这些物质/流变学性质 新的生物聚合物,以便在分子水平上制定进一步的设计标准。 工程生物聚合物合成的方法包括:合成途径中酶的分离和表征(β-酮硫解酶,乙酰乙酰辅酶A还原酶和PHB合成酶); 在载体中克隆基因; 将载体置于受调节启动子的控制下; 基因表达; 确定聚合物生产和组成中其他因素如底物特异性的功能和用途; 以及所得聚合物的分离和物理和化学分析。