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Modular assembly of the nucleolar pre-60S ribosomal subunit.

Abstract：

:Early co-transcriptional events during eukaryotic ribosome assembly result in the formation of precursors of the small (40S) and large (60S) ribosomal subunits. A multitude of transient assembly factors regulate and chaperone the systematic folding of pre-ribosomal RNA subdomains. However, owing to a lack of structural information, the role of these factors during early nucleolar 60S assembly is not fully understood. Here we report cryo-electron microscopy (cryo-EM) reconstructions of the nucleolar pre-60S ribosomal subunit in different conformational states at resolutions of up to 3.4 Å. These reconstructions reveal how steric hindrance and molecular mimicry are used to prevent both premature folding states and binding of later factors. This is accomplished by the concerted activity of 21 ribosome assembly factors that stabilize and remodel pre-ribosomal RNA and ribosomal proteins. Among these factors, three Brix-domain proteins and their binding partners form a ring-like structure at ribosomal RNA (rRNA) domain boundaries to support the architecture of the maturing particle. The existence of mutually exclusive conformations of these pre-60S particles suggests that the formation of the polypeptide exit tunnel is achieved through different folding pathways during subsequent stages of ribosome assembly. These structures rationalize previous genetic and biochemical data and highlight the mechanisms that drive eukaryotic ribosome assembly in a unidirectional manner.

journal_name

Nature

journal_title

Nature

authors

Sanghai ZA,Miller L,Molloy KR,Barandun J,Hunziker M,Chaker-Margot M,Wang J,Chait BT,Klinge S

doi

10.1038/nature26156

subject

Has Abstract

pub_date

2018-04-05 00:00:00

pages

126-129

issue

7699

eissn

0028-0836

issn

1476-4687

pii

nature26156

journal_volume

556

pub_type

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