Abstract:
:The 90S pre-ribosome is an early biogenesis intermediate formed during co-transcriptional ribosome formation, composed of ∼70 assembly factors and several small nucleolar RNAs (snoRNAs) that associate with nascent pre-rRNA. We report the cryo-EM structure of the Chaetomium thermophilum 90S pre-ribosome, revealing how a network of biogenesis factors including 19 β-propellers and large α-solenoid proteins engulfs the pre-rRNA. Within the 90S pre-ribosome, we identify the UTP-A, UTP-B, Mpp10-Imp3-Imp4, Bms1-Rcl1, and U3 snoRNP modules, which are organized around 5'-ETS and partially folded 18S rRNA. The U3 snoRNP is strategically positioned at the center of the 90S particle to perform its multiple tasks during pre-rRNA folding and processing. The architecture of the elusive 90S pre-ribosome gives unprecedented structural insight into the early steps of pre-rRNA maturation. Nascent rRNA that is co-transcriptionally folded and given a particular shape by encapsulation within a dedicated mold-like structure is reminiscent of how polypeptides use chaperone chambers for their protein folding.
journal_name
Celljournal_title
Cellauthors
Kornprobst M,Turk M,Kellner N,Cheng J,Flemming D,Koš-Braun I,Koš M,Thoms M,Berninghausen O,Beckmann R,Hurt Edoi
10.1016/j.cell.2016.06.014subject
Has Abstractpub_date
2016-07-14 00:00:00pages
380-393issue
2eissn
0092-8674issn
1097-4172pii
S0092-8674(16)30743-7journal_volume
166pub_type
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