Figure 3.

RNA nanostructures assembled from loop–loop and receptor–loop interactions. (a) Examples of pRNA assembly into hexamers and (b) RNA nanocages facilitated by pRNA loop–loop interactions. (c) Nanoring structures obtained by using advantage of 120° angle formed by kissing–loop interactions between RNAI and RNAII loop sequences of ColE1. (d) Examples of RNA filaments self-assembled via intermolecular receptor-loop loop-receptor interactons. Figure 3a–d were adapted with permissions from Ref [54] (Copyright 2013 RNA Society), Ref [55] (Copyright 2014 Springer Nature), Ref [18] (Copyright 2011 American Chemical Society), and [57] (Copyright 2006 Oxford University Press), respectively.