Reconstitution of RNA Interference Machinery
Small RNAs, including small interfering RNAs (siRNAs) and microRNAs (miRNAs), silence protein expression from target mRNAs bearing their complementary sequences, via the formation of the effector complex called RNA-induced silencing complex (RISC). Although the mechanism of RISC assembly has been studied for nearly two decades, the detailed mechanism has still remained unclear in part due to the lack of a pure reconstitution system. Recently, we identified all the core proteins necessary for RISC assembly in flies and successfully recapitulated the assembly of catalytically active RISC with eight recombinant proteins. The reconstitution system provides a versatile framework for detailed studies of RISC assembly, including single molecule analysis as described in another chapter in this issue.
Key wordssiRNA miRNA Chaperone Argonaute
We are grateful to members of Tomari laboratory and Iwasaki laboratory for critical reading of this manuscript. This work is supported by in part by Grants-in-Aid for Scientific Research on Innovative Areas (‘Functional machinery for non-coding RNAs’ 21115002 and ‘Non-coding RNA neo-taxonomy’ 26113007) (to Y.T.), and a Grant-in-Aid for Scientific Research on Innovative Areas (‘nascent chain biology’ JP17H05679) and Grant-in-Aid for Young Scientists (‘Start-up’ 23870004 and ‘A’ JP17H04998) (to S.I.) from The Ministry of Education, Culture, Sports, Science and Technology in Japan.