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    • 1. 发明授权
    • Eukaryotic use of improved chimeric mutational vectors
    • 改良的嵌合突变载体的真核生物学应用
    • US06573046B1
    • 2003-06-03
    • US09429291
    • 1999-10-28
    • Eric B. KmiecHoward B. GamperAllyson D. Cole-Strauss
    • Eric B. KmiecHoward B. GamperAllyson D. Cole-Strauss
    • C12Q168
    • C12N15/102
    • The invention is based on the reaction of recombinagenic oligonucleotides in a cell-free system containing a cytoplasmic cell extract and a test duplex DNA on a plasmid. The reaction specifically converts a mutant kanr gene to recover the resistant phenotype in transformed MutS, RecA deficient bacteria and allows for the rapid and quantitative comparison of recombinagenic oligonucleobases. Using this system a type of Duplex Mutational Vector termed a Heteroduplex Mutational Vector, was shown to be more active in than the types of mutational vectors heretofore tested. Further improvements in activity were obtained by replacement of a tetrathymidine linker by a nuclease resistant oligonucleotide, such as tetra-2′-O-methyl-uridine, to link the two strands of the Duplex Mutational Vector and removal of the DNA-containing intervening segment. The claims concern Duplex Mutational Vectors that contain the above improvements. In an alternative embodiment the claims concern a reaction mixture containing a recombinagenic oligonucleobase, a cell-free enzyme mixture and a duplex DNA containing a target sequence. In yet an alternative embodiment, the invention concerns the use of such mixture to test improvements in recombinagenic oligonucleobases, as well as to test the effects of compounds on the activity of the cell-free enzyme mixture and also to make specific changes in the target DNA sequence.
    • 本发明基于重组型寡核苷酸在含有质粒上的细胞质细胞提取物和测试双链体DNA的无细胞系统中的反应。 该反应特异性转化突变型kanr基因以在转化的MutS,RecA缺陷型细菌中恢复抗性表型,并允许对重组型寡核苷酸的快速和定量比较。 使用该系统,称为异源双链突变载体的一种双链突变载体被证明比迄今为止测试的突变载体的类型更有活性。 通过用核酸酶抗性寡核苷酸(例如四 - 2'-O-甲基 - 尿苷)替代四硫氨酸接头,连接双链突变载体的两条链和去除含有DNA的中间片段,获得活性的进一步改善 。 这些权利要求涉及包含上述改进的双链突变载体。 在替代实施方案中,权利要求涉及含有重组型寡核苷酸,无细胞的酶混合物和含有靶序列的双链体DNA的反应混合物。 在另一个实施方案中,本发明涉及使用这样的混合物来测试重组型寡核苷酸的改进,以及测试化合物对无细胞酶混合物的活性的影响,并且还对靶DNA进行特异性改变 序列。
    • 2. 发明授权
    • Eukaryotic use of non-chimeric mutational vectors
    • 非嵌合突变载体的真核生物学应用
    • US6010907A
    • 2000-01-04
    • US78064
    • 1998-05-12
    • Eric B. KmiecHoward B. GamperAllyson D. Cole-Strauss
    • Eric B. KmiecHoward B. GamperAllyson D. Cole-Strauss
    • C12N15/09C12N1/11C12N15/10C12N5/10C12N15/11C12N15/63
    • C12N15/102
    • The invention is based on the reaction of Duplex Mutational Vector in a cell-free system containing a cytoplasmic cell extract and a test plasmid. The reaction specifically converts a mutant kan.sup.r gene to recover the resistant phenotype in transformed MutS, RecA deficient bacteria. Using this system a type of Duplex Mutational Vector termed a Non-Chimeric Mutational Vector, having no RNA:DNA hybrid-duplex is shown to be an effective substrate for eukaryotic enzymes. The invention concerns the use of Non-Chimeric Mutational Vectors protected from 3' exonuclease attack in eukaryotic cells. Such protection can be conferred by replacement of a tetrathymidine linker by a nuclease resistant oligonucleotide, such as tetra-2'-O-methyl-uridine, to link the two strands of the recombinagenic oligonucleobase.
    • 本发明基于双链突变载体在含有细胞质细胞提取物和测试质粒的无细胞系统中的反应。 该反应特异性转化突变型kanr基因以在转化的MutS,RecA缺陷型细菌中恢复抗性表型。 使用该系统,一种称为非嵌合突变载体的双链突变载体,没有RNA:DNA杂合双链体显示为真核生物酶的有效底物。 本发明涉及在真核细胞中保护3'核酸外切酶攻击的非嵌合突变载体的用途。 这样的保护可以通过用核酸酶抗性寡核苷酸(例如四 - 2'-O-甲基 - 尿苷)替代四连体酶连接体来连接重组型寡核苷酸的两条链。
    • 7. 发明授权
    • Bifunctional Crosslinking oligonucleotides adapted for linking to a target sequence of duplex DNA
    • 双功能交联寡核苷酸适于与双链DNA的靶序列连接
    • US06312953B1
    • 2001-11-06
    • US08266949
    • 1994-06-27
    • Rich B. Meyer, Jr.Howard B. GamperIgor V. KutyavinAlexander A. Gall
    • Rich B. Meyer, Jr.Howard B. GamperIgor V. KutyavinAlexander A. Gall
    • C12Q168
    • C07H21/00
    • Chemically modified oligonucleotides (ODNS) are complementary, either in the sense of the classic “four letter code” recognition motif, or in the sense required for triple strand formation based on the more limited “two letter code recognition motif”, to a target sequence of double stranded DNA of an invading cell, organism or pathogen, such as a virus, fungus, parasite, bacterium, malignant cell, or any duplex DNA which is desired to be broken into segments for the purpose of “mapping”. The ODNs have cross-linking agents covalently attached at least to two different sites of the ODN. Alternatively, the cross-linking agent which is attached to one site on the ODN has two cross-linking functionalities, and therefore in effect comprises two cross-linking agents. The cross-linking agent typically includes a linker arm (such as an alkyl, alkoxy, aminoalkyl or amidoalkyl chain) and a reactive group which, after triple strand formation with the target sequence of DNA, is capable of reacting with the target DNA to form a covalent bond therewith. Each cross-linking agent of the novel modified ODNs is capable of forming a covalent bond with the target DNA. As a result of the covalent bond formation between the modified ODN and both strands of the target DNA sequence, replication and expression of the target DNA sequence is inhibited. Alternatively the duplex DNA is selectively cleaved with enzymes or amino acids, at the alkylation sites for “mapping” or other investigative purposes.
    • 化学修饰的寡核苷酸(ODNS)在经典的“四字母代码”识别基序的意义上是互补的,或者在基于更有限的“双字母代码识别基序”的三链形成所需的意义上与目标序列 的入侵细胞,生物体或病原体如病毒,真菌,寄生虫,细菌,恶性细胞或任何双链DNA的双链DNA,其为了“映射”的目的而被分解成片段。 ODN具有共价连接到ODN的至少两个不同位点的交联剂。 或者,连接到ODN上的一个位点的交联剂具有两个交联官能团,因此实际上包含两种交联剂。 交联剂通常包括连接臂(例如烷基,烷氧基,氨基烷基或酰氨基烷基链)和反应性基团,其在与DNA的靶序列形成三链后能够与靶DNA反应形成 与其共价键。 新型修饰的ODN的交联剂能与靶DNA形成共价键。 由于修饰的ODN与目标DNA序列的两条链之间共价键的形成,靶DNA序列的复制和表达被抑制。 或者,双链DNA在烷基化位点被选择性地用酶或氨基酸切割,用于“映射”或其它调查目的。