The complete structure of the small-subunit processome.
Barandun, J., Chaker-Margot, M., Hunziker, M., Molloy, K.R., Chait, B.T., Klinge, S.(2017) Nat Struct Mol Biol 24: 944-953
- PubMed: 28945246 Search on PubMed
- DOI: https://doi.org/10.1038/nsmb.3472
- Primary Citation Related Structures: 
5WLC - PubMed Abstract: 
The small-subunit processome represents the earliest stable precursor of the eukaryotic small ribosomal subunit. Here we present the cryo-EM structure of the Saccharomyces cerevisiae small-subunit processome at an overall resolution of 3.8 Å, which provides an essentially complete near-atomic model of this assembly. In this nucleolar superstructure, 51 ribosome-assembly factors and two RNAs encapsulate the 18S rRNA precursor and 15 ribosomal proteins in a state that precedes pre-rRNA cleavage at site A1. Extended flexible proteins are employed to connect distant sites in this particle. Molecular mimicry and steric hindrance, as well as protein- and RNA-mediated RNA remodeling, are used in a concerted fashion to prevent the premature formation of the central pseudoknot and its surrounding elements within the small ribosomal subunit.
- Laboratory of Protein and Nucleic Acid Chemistry, The Rockefeller University, New York, New York, USA.
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