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| Status |
Public on Dec 21, 2017 |
| Title |
eIF1A residues implicated in cancer stabilize translation preinitiation complexes and favor suboptimal initiation sites in yeast |
| Organism |
Saccharomyces cerevisiae |
| Experiment type |
Expression profiling by high throughput sequencing
Other
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| Summary |
The translation pre-initiation complex (PIC) scans the mRNA for an AUG codon in favorable context, and AUG recognition stabilizes a closed PIC conformation. The unstructured N-terminal tail (NTT) of yeast eIF1A deploys five basic residues to contact tRNAi, mRNA, or 18S rRNA exclusively in the closed state. Interestingly, EIF1AX mutations altering the human eIF1A NTT are associated with uveal melanoma (UM). We found that substituting all five basic residues, and seven UM-associated substitutions, in yeast eIF1A suppresses initiation at near-cognate UUG codons and AUGs in poor context. Ribosome profiling of NTT substitution R13P reveals heightened discrimination against unfavorable AUG context genome-wide. Both R13P and K16D substitutions destabilize the closed complex at UUG codons in reconstituted PICs. Thus, electrostatic interactions involving the eIF1A NTT stabilize the closed conformation and promote utilization of suboptimal start codons. We predict UM-associated mutations alter human gene expression by increasing discrimination against poor initiation sites.
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| Overall design |
We examined the effect of tif11-R13P on global translational efficiencies (TEs) by ribosome footprint profiling of isogenic WT and tif11-R13P strains. The study includes 8 samples, comprised of 4 mRNA-Seq samples and 4 ribosome footprint profiling samples, derived from 2 biological replicates of tif11? mutant strains harboring plasmid-borne tif11-R13P or the WT TIF11 allele. Additional Ribosome profiling data were used for yeast uORF identification.
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| Contributor(s) |
Martin-Marcos P, Zhou F, Karunasiri C, Zhang F, Dong J, Nanda J, Shardul KD, Sen N, Tamame M, Zeschnigk M, Lorsch JR, Hinnebusch AG |
| Citation(s) |
29206102 |
| |
| Submission date |
Dec 20, 2017 |
| Last update date |
Mar 11, 2019 |
| Contact name |
Jon R. Lorsch |
| E-mail(s) |
jon.lorsch@nih.gov
|
| Phone |
301-594-2172
|
| Organization name |
National Institutes of Health
|
| Department |
Eunice Kennedy Shriver National Institute of Child Health and Human Development,
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| Lab |
Section on the Mechanism and Regulation of Protein Synthesis
|
| Street address |
BG 49 RM 2C08, 49 Convent Dr.
|
| City |
Bethesda |
| State/province |
MD |
| ZIP/Postal code |
20892 |
| Country |
USA |
| |
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| Platforms (1) |
| GPL17342 |
Illumina HiSeq 2500 (Saccharomyces cerevisiae) |
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| Samples (48)
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| Relations |
| BioProject |
PRJNA423281 |
| SRA |
SRP127274 |
| Supplementary file |
Size |
Download |
File type/resource |
| GSE108334_Dataset-list.pdf |
110.9 Kb |
(ftp)(http) |
PDF |
| GSE108334_Yeast_Strain_Genotypes.pdf |
160.1 Kb |
(ftp)(http) |
PDF |
| GSE108334_all_uorf_info.xlsx.gz |
349.3 Kb |
(ftp)(http) |
XLSX |
| GSE108334_mrna-TIF11_fwd.wig.gz |
4.1 Mb |
(ftp)(http) |
WIG |
| GSE108334_mrna-TIF11_rev.wig.gz |
3.4 Mb |
(ftp)(http) |
WIG |
| GSE108334_mrna-tif11-R13P_fwd.wig.gz |
3.4 Mb |
(ftp)(http) |
WIG |
| GSE108334_mrna-tif11-R13P_rev.wig.gz |
3.2 Mb |
(ftp)(http) |
WIG |
| GSE108334_ribo_TIF11_fwd.wig.gz |
3.9 Mb |
(ftp)(http) |
WIG |
| GSE108334_ribo_TIF11_rev.wig.gz |
3.8 Mb |
(ftp)(http) |
WIG |
| GSE108334_ribo_tif11-R13P_fwd.wig.gz |
3.5 Mb |
(ftp)(http) |
WIG |
| GSE108334_ribo_tif11-R13P_rev.wig.gz |
3.4 Mb |
(ftp)(http) |
WIG |
| GSE108334_yeast_all_uorfs.bed.gz |
86.7 Kb |
(ftp)(http) |
BED |
SRA Run Selector |
| Raw data are available in SRA |
| Processed data are available on Series record |
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