2'-O-methylation in mRNA disrupts tRNA decoding during translation elongation
Journal Article
·
· Nature Structural & Molecular Biology
- Stanford Univ. School of Medicine, Stanford, CA (United States); Stanford Univ., Stanford, CA (United States)
- Uppsala Univ., Uppsala (Sweden)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Stanford Univ. School of Medicine, Stanford, CA (United States)
- Stanford Univ. School of Medicine, Stanford, CA (United States); Auburn Univ., Auburn, AL (United States)
- Chaim Sheba Medical Center, Tel-Hashomer (Israel); Tel Aviv Univ., Tel Aviv (Israel)
- The Univ. of Chicago, Chicago, IL (United States)
Chemical modifications of mRNA may regulate many aspects of mRNA processing and protein synthesis. Recently, 2'-O-methylation of nucleotides was identified as a frequent modification in translated regions of human mRNA, showing enrichment in codons for certain amino acids. Here, using single-molecule, bulk kinetics and structural methods, we show that 2'-O-methylation within coding regions of mRNA disrupts key steps in codon reading during cognate tRNA selection. Our results suggest that 2'-O-methylation sterically perturbs interactions of ribosomal-monitoring bases (G530, A1492 and A1493) with cognate codon–anticodon helices, thereby inhibiting downstream GTP hydrolysis by elongation factor Tu (EF-Tu) and A-site tRNA accommodation, leading to excessive rejection of cognate aminoacylated tRNAs in initial selection and proofreading. In conclusion, our current and prior findings highlight how chemical modifications of mRNA tune the dynamics of protein synthesis at different steps of translation elongation.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1460737
- Journal Information:
- Nature Structural & Molecular Biology, Journal Name: Nature Structural & Molecular Biology Journal Issue: 3 Vol. 25; ISSN 1545-9993
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Geometric alignment of aminoacyl-tRNA relative to catalytic centers of the ribosome underpins accurate mRNA decoding
Elongation factor-Tu can repetitively engage aminoacyl-tRNA within the ribosome during the proofreading stage of tRNA selection
Journal Article
·
Sun Sep 10 20:00:00 EDT 2023
· Nature Communications
·
OSTI ID:2470492
Elongation factor-Tu can repetitively engage aminoacyl-tRNA within the ribosome during the proofreading stage of tRNA selection
Journal Article
·
Tue Feb 04 19:00:00 EST 2020
· Proceedings of the National Academy of Sciences of the United States of America
·
OSTI ID:1625035