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首页> 外文期刊>Molecular cell >A novel allosterically trans-activated ribozyme, the maxizyme, with exceptional specificity in vitro and in vivo.
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A novel allosterically trans-activated ribozyme, the maxizyme, with exceptional specificity in vitro and in vivo.

机译:一种新型的变构反式激活核酶,最大酶,在体外和体内均具有出色的特异性。

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摘要

We have constructed an allosterically controllable novel enzyme (designated maxizyme) that can be transcribed in vivo under the control of a human tRNA(Val) promoter. The maxizyme has sensor arms that can recognize target sequences, and in the presence of such a target sequence only, it can form a cavity that can capture catalytically indispensable Mg2+ ions. As a target for a demonstration of the potential utility of the maxizyme, we chose BCR-ABL mRNA, the translated products of which cause chronic myelogenous leukemia. Only the maxizyme (but not conventional ribozymes) had extremely high specificity and high-level activity, not only in vitro but also in cultured cells including BV173 cells derived from a patient with a Philadelphia chromosome. The maxizyme induced apoptosis only in leukemic cells with this chromosome.
机译:我们已经构建了一种变构可控的新型酶(称为最大酶),该酶可以在人tRNA(Val)启动子的控制下在体内转录。最大酶具有可以识别靶序列的传感器臂,并且仅在存在这种靶序列的情况下,它才能形成可以捕获催化必不可少的Mg2 +离子的腔。为了证明最大酶的潜在效用,我们选择了BCR-ABL mRNA,其翻译产物会引起慢性粒细胞性白血病。仅最大酶(而不是常规核酶)具有极高的特异性和高水平的活性,不仅在体外,而且在培养细胞中,包括来自费城染色体患者的BV173细胞。最大酶仅在具有该染色体的白血病细胞中诱导凋亡。

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