Ishikawa Junya, Matsumura Shigeyoshi, Jaeger Luc, Inoue Tan, Furuta Hiroyuki, Ikawa Yoshiya
Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Fukuoka 819-0395, Japan.
Arch Biochem Biophys. 2009 Oct 15;490(2):163-70. doi: 10.1016/j.abb.2009.08.020. Epub 2009 Sep 1.
The DSL ribozyme is a class of artificial ligase ribozymes with a highly modular architecture, which catalyzes template-directed RNA ligation on a helical substrate module that can be either covalently connected (cis-DSL) or physically separated (trans-DSL) from the catalytic module. Substrate recognition by the catalytic module is promoted by one or two sets of GNRA/receptor interactions acting as clamps in the cis or trans configurations, respectively. In this study, we have rationally designed and analyzed the catalytic and self-assembly properties of several trans-DSL ribozymes with different sets of natural and artificial GNRA-receptor clamps. Two variants newly designed in this study showed significantly enhanced catalytic properties with respect of the original trans-DSL construct. While this work allows dissection of the turnover and catalytic properties of the trans-DSL ribozyme, it also emphasizes the remarkable modularity of RNA tertiary structure for nano-construction of complex functions.
DSL核酶是一类具有高度模块化结构的人工连接酶核酶,它催化在螺旋底物模块上进行模板导向的RNA连接,该底物模块可以与催化模块共价连接(顺式DSL)或物理分离(反式DSL)。催化模块对底物的识别分别由一组或两组GNRA/受体相互作用促进,这些相互作用在顺式或反式构型中分别起夹子的作用。在本研究中,我们合理设计并分析了几种具有不同天然和人工GNRA-受体夹子组合的反式DSL核酶的催化和自组装特性。本研究新设计的两个变体相对于原始的反式DSL构建体显示出显著增强的催化特性。虽然这项工作有助于剖析反式DSL核酶的周转和催化特性,但它也强调了RNA三级结构在构建复杂功能纳米结构方面的显著模块化。