5WY3

Crystal structure of Chaetomium thermophilum Utp10 middle domain

Summary for 5WY3

• Entry DOI: 10.2210/pdb5wy3/pdb
• Related: 5WY4
• Descriptor: Putative uncharacterized protein (1 entity in total)
• Functional Keywords: nucleolar protein, components of 90s preribosome, ribosomal protein, nuclear protein
• Biological source: Chaetomium thermophilum var. thermophilum DSM 1495
• Total number of polymer chains: 2
• Total formula weight: 88485.38

Authors

Chen, R.,Zhu, X.,Ye, K. (deposition date: 2017-01-10, release date: 2017-06-28, Last modification date: 2024-03-20)

Primary citation

Sun, Q.,Zhu, X.,Qi, J.,An, W.,Lan, P.,Tan, D.,Chen, R.,Wang, B.,Zheng, S.,Zhang, C.,Chen, X.,Zhang, W.,Chen, J.,Dong, M.Q.,Ye, K.
Molecular architecture of the 90S small subunit pre-ribosome
Elife, 6:-, 2017

PubMed Abstract: Eukaryotic small ribosomal subunits are first assembled into 90S pre-ribosomes. The complete 90S is a gigantic complex with a molecular mass of approximately five megadaltons. Here, we report the nearly complete architecture of 90S determined from three cryo-electron microscopy single particle reconstructions at 4.5 to 8.7 angstrom resolution. The majority of the density maps were modeled and assigned to specific RNA and protein components. The nascent ribosome is assembled into isolated native-like substructures that are stabilized by abundant assembly factors. The 5' external transcribed spacer and U3 snoRNA nucleate a large subcomplex that scaffolds the nascent ribosome. U3 binds four sites of pre-rRNA, including a novel site on helix 27 but not the 3' side of the central pseudoknot, and crucially organizes the 90S structure. The 90S model provides significant insight into the principle of small subunit assembly and the function of assembly factors.

PubMed: 28244370
DOI: 10.7554/eLife.22086

Experimental method

X-RAY DIFFRACTION (3.2 Å)