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Related Experiment Video

Updated: May 22, 2026

Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells

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The eIF4F and eIFiso4F Complexes of Plants: An Evolutionary Perspective.

Ryan M Patrick¹, Karen S Browning

¹Department of Chemistry and Biochemistry and the Institute for Cell and Molecular Biology, The University of Texas at Austin, Austin, TX 78712, USA.

Comparative and Functional Genomics

|May 22, 2012

Summary

The evolution of plant translation initiation complexes reveals that eIFiso4G is ancient, while eIFiso4E emerged with flowering plants. This study traces the evolutionary history of these key protein synthesis factors.

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Area of Science:

Molecular Biology
Evolutionary Biology
Plant Science

Background:

Translation initiation in eukaryotes relies on initiation factors to assemble ribosomes on mRNA.
The eukaryotic initiation factor 4F (eIF4F) complex is crucial for regulating protein synthesis.
Plants possess both the eIF4F complex (eIF4E and eIF4G) and the plant-specific eIFiso4F complex (eIFiso4E and eIFiso4G).

Purpose of the Study:

To investigate the evolutionary history of the eIF4F and eIFiso4F complexes in plants using genomic data.
To understand the conservation and emergence of key components within these complexes across plant lineages.

Main Methods:

Comparative genomics and sequence analysis of eIF4G and eIFiso4G proteins across diverse plant species.
Phylogenetic analysis to trace the evolutionary trajectory of eIF4E and eIFiso4E.

Main Results:

The eIFiso4G protein is conserved throughout the plant kingdom.
The eIFiso4E component is found exclusively in flowering plants, indicating a later evolutionary origin.
The N-terminus of eIF4G, previously challenging to annotate, shows conservation across plants and harbors two uncharacterized motifs.
Sequence comparisons reveal conserved features distinguishing eIFiso4G and eIF4G proteins.

Conclusions:

The study elucidates the evolutionary pathways of plant translation initiation complexes, answering questions about their history.
New questions arise regarding the functional significance of conserved motifs and unique features within eIFiso4G and eIF4G proteins.