7R6N image
Entry Detail
PDB ID:
7R6N
EMDB ID:
Keywords:
Title:
Exon-free state of the Tetrahymena group I intron, symmetry-expanded monomer from a synthetic trimeric construct
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2021-06-22
Release Date:
2022-05-04
Method Details:
Experimental Method:
Resolution:
4.10 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polyribonucleotide
Description:Group I intron
Chain IDs:A
Chain Length:393
Number of Molecules:1
Biological Source:Tetrahymena thermophila
Ligand Molecules
Primary Citation
Sub-3- angstrom cryo-EM structure of RNA enabled by engineered homomeric self-assembly.
Nat.Methods 19 576 585 (2022)
PMID: 35501384 DOI: 10.1038/s41592-022-01455-w

Abstact

High-resolution structural studies are essential for understanding the folding and function of diverse RNAs. Herein, we present a nanoarchitectural engineering strategy for efficient structural determination of RNA-only structures using single-particle cryogenic electron microscopy (cryo-EM). This strategy-ROCK (RNA oligomerization-enabled cryo-EM via installing kissing loops)-involves installing kissing-loop sequences onto the functionally nonessential stems of RNAs for homomeric self-assembly into closed rings with multiplied molecular weights and mitigated structural flexibility. ROCK enables cryo-EM reconstruction of the Tetrahymena group I intron at 2.98-Å resolution overall (2.85 Å for the core), allowing de novo model building of the complete RNA, including the previously unknown peripheral domains. ROCK is further applied to two smaller RNAs-the Azoarcus group I intron and the FMN riboswitch, revealing the conformational change of the former and the bound ligand in the latter. ROCK holds promise to greatly facilitate the use of cryo-EM in RNA structural studies.

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Primary Citation of related structures