TERMINATION OF TRANSCRIPTION BY RNA POLYMERASE I

转录终止是经常使用的控制点 在原核生物中调节基因表达。然而，在多大程度上 这在真核生物中是正确的，目前还不清楚。目前，终止 在真核生物中最被理解的系统是RNA聚合酶I， 主要是由于在我们自己的实验室里对非洲爪蛙的研究 在英格丽德·格鲁姆的实验室里对小鼠进行了研究。网站的位置 终止是已知的，这些位点的各种突变体是可用的，并且 用于终止的良好的检测系统已经在体内和 体外培养。参与终止的蛋白质的分级正在进行中 我们已经开始为这一过程提出可测试的模型。 在本申请中，我们建议继续研究RNA聚合酶I 在埃及克诺普斯终止。参与终止的蛋白质将是 使用体外终止系统进行鉴定和纯化。基因 因为这些蛋白质将被克隆和鉴定。世界的心脏 然后提出的是确定这些细胞的分子机制 影响RNA聚合酶I转录终止的成分

Termination of transcription is a control point that is frequently utilized in prokaryotes to regulate gene expression. However, the extent to which this is true in eukaryotes is not yet clear. At present, the termination system which is best understood in eukaryotes is that of RNA polymerase I, due largely to studies on the frog, Xenopus laevis, in our own laboratory and studies on the mouse in the laboratory of Ingrid Grummt. The sites of termination are known, various mutants of these sites are available, and good assay systems for termination have been developed both in vivo and vitro. Fractionation of the proteins involved in termination is underway and we have begun to propose testable models for the process. In this application we propose to continue studies of RNA polymerase I termination in Xenopus. The proteins involved in termination will be identified and purified using and in vitro termination system. The genes for these proteins will be cloned and characterized. The heart of the proposal then is to determine the molecular mechanism by which these components effect termination of transcription by RNA polymerase I.