These authors contributed equally to this work.
Regulation of translation initiation by the yeast eIF4E binding proteins is required for the pseudohyphal response
Article first published online: 3 NOV 2006
Copyright © 2006 John Wiley & Sons, Ltd.
Volume 23, Issue 14-15, pages 1075–1088, 30 October - November 2006
How to Cite
Ibrahimo, S., Holmes, L. E. A. and Ashe, M. P. (2006), Regulation of translation initiation by the yeast eIF4E binding proteins is required for the pseudohyphal response. Yeast, 23: 1075–1088. doi: 10.1002/yea.1415
- Issue published online: 3 NOV 2006
- Article first published online: 3 NOV 2006
- Manuscript Accepted: 23 AUG 2006
- Manuscript Received: 8 JUN 2006
- BBSRC, UK. Grant Number: BBS/B/07500
- translation control;
- eIF4E-binding proteins;
- pseudohyphal growth;
The eukaryotic translation initiation factor eIF4E is responsible for the recognition of the mRNA cap structure and, as such, plays a key role in the selection of mRNAs for translation. The interaction of eIF4E with the ‘multi-adaptor’ eIF4G (and thus recruitment of ribosomes to mRNA) can be regulated via competitive binding of 4E-binding proteins (4E-BPs). 4E-BPs have broad functions in cell growth, proliferation and development. We have found that disruption of the genes for either of the yeast 4E-BPs (Eap1p or Caf20p) leads to an inhibition of pseudohyphal growth in the resulting diploid yeast strain following nitrogen limitation. Specific 4E-binding domain mutations destroy the capacity of each 4E-BP gene to complement the non-pseudohyphal phenotype, suggesting that a translational function for the 4E-BPs is important for pseudohyphal growth. In addition, neither of the 4E-BP deletion strains is deficient in global or stress-regulated protein synthesis. However, our evidence reveals that the two 4E-BPs are functionally distinct with regard to pseudohyphal growth. Therefore, this work supports a model where the yeast 4E-BPs are acting on specific mRNAs to facilitate a defined proliferative response to environmental stress in yeast. Copyright © 2006 John Wiley & Sons, Ltd.