Open Access
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Science, volume 369, issue 6510, pages 1470-1476

90S pre-ribosome transformation into the primordial 40S subunit

Lau Benjamin 2
La Venuta Giuseppe 2
Ameismeier Michael 1
Berninghausen Otto 1
Hurt Ed 2
Beckmann Roland 1
1
 
Gene Center, Department of Biochemistry, University of Munich, 81377 Munich, Germany.
Publication typeJournal Article
Publication date2020-09-18
Journal: Science
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor56.9
ISSN00368075, 10959203
Multidisciplinary
Abstract
How ribosomes are made The formation of eukaryotic ribosomes is a complex process that starts with transcription of a large precursor RNA that assembles into a large 90S preribosome, which matures to finally give the 40S small subunit of the ribosome. Cheng et al. and Du et al. give insight into this process, using cryo–electron microscopy to look at intermediates along the pathway. Together, these studies reveal how a cast of molecular players act to coordinate the compositional and structural changes that transform the 90S preribosome into a pre-40S subunit. Science, this issue p. 1470, p. 1477 The steps that drive the stepwise dissociation of factors in the transition from the 90S to the 40S ribosome subunit are observed. Production of small ribosomal subunits initially requires the formation of a 90S precursor followed by an enigmatic process of restructuring into the primordial pre-40S subunit. We elucidate this process by biochemical and cryo–electron microscopy analysis of intermediates along this pathway in yeast. First, the remodeling RNA helicase Dhr1 engages the 90S pre-ribosome, followed by Utp24 endonuclease–driven RNA cleavage at site A1, thereby separating the 5′-external transcribed spacer (ETS) from 18S ribosomal RNA. Next, the 5′-ETS and 90S assembly factors become dislodged, but this occurs sequentially, not en bloc. Eventually, the primordial pre-40S emerges, still retaining some 90S factors including Dhr1, now ready to unwind the final small nucleolar U3–18S RNA hybrid. Our data shed light on the elusive 90S to pre-40S transition and clarify the principles of assembly and remodeling of large ribonucleoproteins.

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GOST Copy
Cheng J. et al. 90S pre-ribosome transformation into the primordial 40S subunit // Science. 2020. Vol. 369. No. 6510. pp. 1470-1476.
GOST all authors (up to 50) Copy
Cheng J., Lau B., La Venuta G., Ameismeier M., Berninghausen O., Hurt E., Beckmann R. 90S pre-ribosome transformation into the primordial 40S subunit // Science. 2020. Vol. 369. No. 6510. pp. 1470-1476.
RIS |
Cite this
RIS Copy
TY - JOUR
DO - 10.1126/science.abb4119
UR - https://doi.org/10.1126%2Fscience.abb4119
TI - 90S pre-ribosome transformation into the primordial 40S subunit
T2 - Science
AU - Cheng, Jingdong
AU - Lau, Benjamin
AU - La Venuta, Giuseppe
AU - Ameismeier, Michael
AU - Berninghausen, Otto
AU - Hurt, Ed
AU - Beckmann, Roland
PY - 2020
DA - 2020/09/18 00:00:00
PB - American Association for the Advancement of Science (AAAS)
SP - 1470-1476
IS - 6510
VL - 369
SN - 0036-8075
SN - 1095-9203
ER -
BibTex |
Cite this
BibTex Copy
@article{2020_Cheng,
author = {Jingdong Cheng and Benjamin Lau and Giuseppe La Venuta and Michael Ameismeier and Otto Berninghausen and Ed Hurt and Roland Beckmann},
title = {90S pre-ribosome transformation into the primordial 40S subunit},
journal = {Science},
year = {2020},
volume = {369},
publisher = {American Association for the Advancement of Science (AAAS)},
month = {sep},
url = {https://doi.org/10.1126%2Fscience.abb4119},
number = {6510},
pages = {1470--1476},
doi = {10.1126/science.abb4119}
}
MLA
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MLA Copy
Cheng, Jingdong, et al. “90S pre-ribosome transformation into the primordial 40S subunit.” Science, vol. 369, no. 6510, Sep. 2020, pp. 1470-1476. https://doi.org/10.1126%2Fscience.abb4119.
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