Abstract
RNA-protein interactions play important roles in various eukaryotic biological processes. Molecular imaging of subcellular localization of RNA-protein complexes in plants is critical for understanding these interactions. However, methods to image RNA-protein interactions in living plants have not yet been developed until now. Recently, we have developed a trimolecular fluorescence complementation (TriFC) system for in vivo visualization of RNA-protein interaction by transient expression in tobacco leaves. In this method, we combined conventional bimolecular fluorescence complementation (BiFC) system with the MS2 system (phage MS2 coat protein [MCP] and its binding RNA sequence [MS2 sequence]) to tag lncRNA. Target RNA is tagged with 6xMS2, and MCP and RNA-binding protein are fused with YFP fragments. DNA constructs encoding such fusion RNA and proteins are infiltrated into tobacco leaves with Agrobacterium suspensions. RNA-protein interaction in vivo is observed by confocal microscopy.
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