Functional overlap between eIF4G isoforms in Saccharomyces cerevisiae.
Initiation factor eIF4G is a key regulator of eukaryotic protein synthesis, recognizing proteins bound at both ends of an mRNA to help recruit messages to the small (40S) ribosomal subunit. Notably, the genomes of a wide variety of eukaryotes encode multiple distinct variants of eIF4G. We found that...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Public Library of Science (PLoS)
2010-02-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC2817733?pdf=render |
| _version_ | 1818538655649628160 |
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| author | Bryan K Clarkson Wendy V Gilbert Jennifer A Doudna |
| author_facet | Bryan K Clarkson Wendy V Gilbert Jennifer A Doudna |
| author_sort | Bryan K Clarkson |
| collection | DOAJ |
| description | Initiation factor eIF4G is a key regulator of eukaryotic protein synthesis, recognizing proteins bound at both ends of an mRNA to help recruit messages to the small (40S) ribosomal subunit. Notably, the genomes of a wide variety of eukaryotes encode multiple distinct variants of eIF4G. We found that deletion of eIF4G1, but not eIF4G2, impairs growth and global translation initiation rates in budding yeast under standard laboratory conditions. Not all mRNAs are equally sensitive to loss of eIF4G1; genes that encode messages with longer poly(A) tails are preferentially affected. However, eIF4G1-deletion strains contain significantly lower levels of total eIF4G, relative to eIF4G2-delete or wild type strains. Homogenic strains, which encode two copies of either eIF4G1 or eIF4G2 under native promoter control, express a single isoform at levels similar to the total amount of eIF4G in a wild type cell and have a similar capacity to support normal translation initiation rates. Polysome microarray analysis of these strains and the wild type parent showed that translationally active mRNAs are similar. These results suggest that total eIF4G levels, but not isoform-specific functions, determine mRNA-specific translational efficiency. |
| first_indexed | 2024-12-11T21:31:46Z |
| format | Article |
| id | doaj.art-f76a9519f6064a1aba751b2b0546c4d5 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-11T21:31:46Z |
| publishDate | 2010-02-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-f76a9519f6064a1aba751b2b0546c4d52022-12-22T00:50:09ZengPublic Library of Science (PLoS)PLoS ONE1932-62032010-02-0152e911410.1371/journal.pone.0009114Functional overlap between eIF4G isoforms in Saccharomyces cerevisiae.Bryan K ClarksonWendy V GilbertJennifer A DoudnaInitiation factor eIF4G is a key regulator of eukaryotic protein synthesis, recognizing proteins bound at both ends of an mRNA to help recruit messages to the small (40S) ribosomal subunit. Notably, the genomes of a wide variety of eukaryotes encode multiple distinct variants of eIF4G. We found that deletion of eIF4G1, but not eIF4G2, impairs growth and global translation initiation rates in budding yeast under standard laboratory conditions. Not all mRNAs are equally sensitive to loss of eIF4G1; genes that encode messages with longer poly(A) tails are preferentially affected. However, eIF4G1-deletion strains contain significantly lower levels of total eIF4G, relative to eIF4G2-delete or wild type strains. Homogenic strains, which encode two copies of either eIF4G1 or eIF4G2 under native promoter control, express a single isoform at levels similar to the total amount of eIF4G in a wild type cell and have a similar capacity to support normal translation initiation rates. Polysome microarray analysis of these strains and the wild type parent showed that translationally active mRNAs are similar. These results suggest that total eIF4G levels, but not isoform-specific functions, determine mRNA-specific translational efficiency.http://europepmc.org/articles/PMC2817733?pdf=render |
| spellingShingle | Bryan K Clarkson Wendy V Gilbert Jennifer A Doudna Functional overlap between eIF4G isoforms in Saccharomyces cerevisiae. PLoS ONE |
| title | Functional overlap between eIF4G isoforms in Saccharomyces cerevisiae. |
| title_full | Functional overlap between eIF4G isoforms in Saccharomyces cerevisiae. |
| title_fullStr | Functional overlap between eIF4G isoforms in Saccharomyces cerevisiae. |
| title_full_unstemmed | Functional overlap between eIF4G isoforms in Saccharomyces cerevisiae. |
| title_short | Functional overlap between eIF4G isoforms in Saccharomyces cerevisiae. |
| title_sort | functional overlap between eif4g isoforms in saccharomyces cerevisiae |
| url | http://europepmc.org/articles/PMC2817733?pdf=render |
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