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    • 32. 发明授权
    • Production of branched RNA-linked multi-copy single-stranded DNA using
permeabilized cells
    • 使用透化细胞生产支链RNA连接的多拷贝单链DNA
    • US5079151A
    • 1992-01-07
    • US315427
    • 1989-02-24
    • Bert C. LampsonMasayori InouyeSumiko Inouye
    • Bert C. LampsonMasayori InouyeSumiko Inouye
    • C07H21/04C12N15/09C12N15/10C12P19/34C12R1/01
    • C12N15/10C12P19/34Y10S435/822
    • msDNA is a peculiar molecule consisting of a branched RNA linked to single-stranded DNA via a 2', 5' phosphodiester bond. A cell-free system, utilizing cells permeablized with phenethyl, alcohol, was established to study the synthesis of msDNA in Myxococcus xanthus. Permeablized cell labeled with [.alpha.-.sup.32 P]dCTP in the presence of ddGTP, ddATP, or ddTTP, produce a band that migrates at the same position as the full-sized msDNA in an acrylamide gel. However, when this band is treated with ribonuclease A prior to gel electrophoresis, it resulted in many bands of different sizes. This indicates that during the labeling, intermediates are produced in which single-stranded DNAs of various lengths are associated with a compensatory length of RNA such that the total length for each intermediate is identical. These results provide evidence for the previously proposed model in which msDNA is synthesized by reverse transcriptase using a folded RNA precursor as a primer as well as a template. Furthermore, it was found that there is a precise coupling mechanism of reverse transcriptase and ribonuclease H.
    • msDNA是由通过2',5'磷酸二酯键与单链DNA连接的支链RNA组成的特殊分子。 建立了一种无细胞系统,利用渗透有苯乙醇,醇的细胞,研究了黄连球菌中msDNA的合成。 在ddGTP,ddATP或ddTTP存在下用[α-32P] dCTP标记的渗透细胞产生在与丙烯酰胺凝胶中的全尺寸msDNA相同位置迁移的条带。 然而,当在胶束电泳之前用核糖核酸酶A处理该条带时,其产生许多不同大小的条带。 这表明在标记过程中产生了中间体,其中各种长度的单链DNA与代偿性长度的RNA相关联,使得每个中间体的总长度相同。 这些结果为先前提出的模型提供了证据,其中使用折叠的RNA前体作为引物以及模板通过逆转录酶合成了msDNA。 此外,发现有逆转录酶和核糖核酸酶H的精确偶联机制。