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Triblock copolymer micelle model of spherical paraspeckles
| Title: | Triblock copolymer micelle model of spherical paraspeckles |
| Authors: | Yamamoto, Tetsuya Browse this author →KAKEN DB | | Yamazaki, Tomohiro Browse this author →KAKEN DB | | Hirose, Tetsuro Browse this author →KAKEN DB |
| Keywords: | paraspeckle | | NEAT1_2 | | architectural RNA | | micellization | | transcription |
| Issue Date: | 22-Aug-2022 |
| Publisher: | Frontiers Media |
| Journal Title: | Frontiers in Molecular Biosciences |
| Volume: | 9 |
| Start Page: | 925058 |
| Publisher DOI: | 10.3389/fmolb.2022.925058 |
| Abstract: | Paraspeckles are nuclear bodies scaffolded by RNP complexes of NEAT1_2 RNA transcripts and multiple RNA-binding proteins. The assembly of paraspeckles is coupled with the transcription of NEAT1_2. Paraspeckles form the core-shell structure, where the two terminal regions of NEAT1_2 RNP complexes compose the shell of the paraspeckle and the middle regions of these complexes compose the core. We here construct a theoretical model of paraspeckles by taking into account the transcription of NEAT1_2 in an extension of the theory of block copolymer micelles. This theory predicts that the core-shell structure of a paraspeckle is assembled by the association of the middle region of NEAT1_2 RNP complexes due to the multivalent interactions between RBPs bound to these regions and by the relative affinity of the terminal regions of the complexes to the nucleoplasm. The latter affinity results in the effective repulsive interactions between terminal regions of the RNA complexes and limits the number of complexes composing the paraspeckle. In the wild type, the repulsive interaction between the middle and terminal block dominates the thermal fluctuation. However, the thermal fluctuation can be significant in a mutant, where a part of the terminal regions of NEAT1_2 is deleted, and distributes the shortened terminal regions randomly between the shell and the core, consistent with our recent experiments. With the upregulated transcription, the shortened terminal regions of NEAT1_2 in a deletion mutant is localized to the core to decrease the repulsive interaction between the terminal regions, while the structure does not change with the upregulation in the wild type. The robustness of the structure of paraspeckles in the wild type results from the polymeric nature of NEAT1_2 complexes. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/87454 |
| Appears in Collections: | 化学反応創成研究拠点：ICReDD (Institute for Chemical Reaction Design and Discovery : ICReDD) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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