Evolution of protein-coupled RNA dynamics during hierarchical assembly of ribosomal complexes
- Johns Hopkins Univ., Baltimore, MD (United States). T.C. Jenkins Dept. of Biophysics
- Ulsan National Institute of Science and Technology, Ulsan (Korea, Republic of). School of Life Sciences. Inst. for Basic Science. Center for Genomic Integrity
- Univ. of Illinois at Urbana-Champaign, IL (United States). Dept. of Chemistry
- Univ. of Illinois at Urbana-Champaign, IL (United States). Center for the Physics of Living Cells and Inst. for Genomic Biology. Dept. of Physics
- Johns Hopkins Univ., Baltimore, MD (United States). T.C. Jenkins Dept. of Biophysics; Univ. of Illinois at Urbana-Champaign, IL (United States). Center for the Physics of Living Cells and Inst. for Genomic Biology. Dept. of Physic; Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Biophysics and Biophysical Chemistry. Dept. of Biomedical Engineering; Howard Hughes Medical Inst., Baltimore, MD (United States)
Assembly of 30S ribosomes involves the hierarchical addition of ribosomal proteins that progressively stabilize the folded 16S rRNA. Here, we use three-color single molecule FRET to show how combinations of ribosomal proteins uS4, uS17 and bS20 in the 16S 5' domain enable the recruitment of protein bS16, the next protein to join the complex. Analysis of real-time bS16 binding events shows that bS16 binds both native and non-native forms of the rRNA. The native rRNA conformation is increasingly favored after bS16 binds, explaining how bS16 drives later steps of 30S assembly. Chemical footprinting and molecular dynamics simulations show that each ribosomal protein switches the 16S conformation and dampens fluctuations at the interface between rRNA subdomains where bS16 binds. The results suggest that specific protein-induced changes in the rRNA dynamics underlie the hierarchy of 30S assembly and simplify the search for the native ribosome structure.
- Research Organization:
- Univ. of Illinois at Urbana-Champaign, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
- Grant/Contract Number:
- FG02-00ER41132
- OSTI ID:
- 1624045
- Journal Information:
- Nature Communications, Vol. 8, Issue 1; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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