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rRNA methylation by Spb1 regulates the GTPase activity of Nog2 during 60S ribosomal subunit assembly
Open accessPreprint — published as 10.1038/s41467-023-36867-5 · Paper page
Abstract
Biogenesis of the large ribosomal (60S) subunit involves the assembly of three rRNAs and 46 proteins, a process requiring approximately 70 ribosome biogenesis factors (RBFs) that bind and release the pre-60S at specific steps along the assembly pathway. The methyltransferase Spb1 and the K-loop GTPase Nog2 are essential RBFs that engage the rRNA A-loop during sequential steps in 60S maturation. Spb1 methylates the A-loop nucleotide G2922 and a catalytically deficient mutant strain ( spb1 D52A ) has a severe 60S biogenesis defect. However, the assembly function of this modification is currently unknown. Here, we present cryo-EM reconstructions that reveal that unmethylated G2922 leads to the premature activation of Nog2 GTPase activity and capture a Nog2-GDP-AlF 4 - transition state structure that shows the direct involvement of unmodified G2922 in Nog2 GTPase activation. Intragenic and dosage suppressors indicate that the biogenesis defect in the spb1 D52A strain is caused by reduced initial recruitment of Nog2 to early nucleoplasmic 60S intermediates. We propose that G2922 methylation levels regulate Nog2 stability on the pre-60S near the nucleolar/nucleoplasmic phase boundary, forming a kinetic checkpoint to regulate 60S production. Because multiple K-loop GTPases are involved in the assembly of ribosomes and other RNPs, our findings provide a template to study the role of RNA trans factors in modulating the regulatory functions of this important family of enzymes.
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Metadata
- Authors
- Sekulski, K., Cruz, V. E., Weirich, C. S., & Erzberger, J. P.
- Affiliations
- The University of Texas Southwestern Medical Center (US)
- Corresponding author
- Erzberger, Jan P.
- Venue
- Nature Communications
- Publisher
- openRxiv
- Published
- 2022-05-25
- Volume
- 14
- Issue
- 1
- Pages
- 1207-1207
- ISSN
- 2041-1723 (ISSN-L)
- PMC
- PMC9981671
- OpenAlex
- W4322764097
- Cited by
- 12
- References
- 1
- Citations by year
- 2026: 2 · 2025: 3 · 2024: 3 · 2023: 3 · 2022: 1
- FWCI
- 0.98
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by
- Locations
- Nature Communications (publishedVersion, cc-by)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion, cc-by)
- RePEc: Research Papers in Economics (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- U.S. Department of Energy (grid.436923.9, 436923.9)
- U.S. Department of Health and Human Services (GM135617-01)
- Welch Foundation (I-1897, RP170644)
- Cancer Prevention and Research Institute of Texas (RP170644, 1P30 CA142543, RR150074)
- Oregon Health and Science University (grid.436923.9, 436923.9)
- University of Texas Southwestern Medical Center
- National Institutes of Health (RP170644)
- Office of Science (grid.436923.9)
- National Cancer Institute ((CA142543), P30CA142543)
- National Institute of General Medical Sciences (GM135617-01, U24GM129547, R01GM135617)
- Biological and Environmental Research (grid.436923.9)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nuclear Structure and Function
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA modifications and cancer
- Keywords
- rRNA methylation, 60S ribosomal subunit assembly, ribosome biogenesis, GTPase activation, cryo-EM structure, genetic suppressors
- MeSH terms
- Kinetics, Methylation, Methyltransferases, RNA Processing, Post-Transcriptional, GTP Phosphohydrolases, Ribosome Subunits, Large, Eukaryotic
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