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Processing of multiple-intron-containing pretRNA

机译:含多内含子的pretRNA的加工

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摘要

Computational studies predict the simultaneous presence of two and even three introns in certain crenarchaeal tRNA genes. In these multiple-intron-containing pretRNAs, the introns are nested one inside the other and the pretRNA folds into a conformation that is anticipated to allow splicing of the last intron only after splicing the others. A set of operations, each consisting of two cleavages and one ligation, therefore needs to be carried out sequentially. PretRNAs containing multiple introns are predicted to fold, forming bulge-helix-bulge (BHB) and BHB-like motifs. The tRNA splicing endonuclease should recognize these motifs. To test this hypothetical scenario, we used the homotetrameric enzyme from Meth-anocaldococcus jannaschii (METJA) and the heterotetrameric enzyme from Sulfolobus solfataricus (SULSO). On the basis of our previous studies, the METJA enzyme should cleave only the BHB structure motif, while the SULSO enzyme can in addition cleave variant substrate structures, like the bulge-helix-loop (BHL). We show here that the processing of multiple-intron-containing pretRNA can be observed in vitro.
机译:计算研究预测某些crenarchaeal tRNA基因中同时存在两个甚至三个内含子。在这些包含多内含子的pretRNA中,内含子一个嵌套在另一个内含子中,并且pretRNA折叠成一个构象,该构象预期仅在剪接其他内含子后才允许剪接最后一个内含子。因此,需要顺序执行一组操作,每个操作由两个切割和一个连接组成。包含多个内含子的PretRNA预计会折叠,形成凸起-螺旋-凸起(BHB)和BHB样基序。 tRNA剪接核酸内切酶应识别这些基序。为了验证这种假设情况,我们使用了来自詹氏甲烷菌的同四聚酶(METJA)和来自Sulfolobus solfataricus的异四聚酶(SULSO)。根据我们先前的研究,METJA酶应仅裂解BHB结构基序,而SULSO酶还可以裂解变异的底物结构,例如凸起-螺旋环(BHL)。我们在这里显示可以在体外观察到含有多个内含子的pretRNA的加工。

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