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Related Experiment Video

Updated: Jan 24, 2026

Loop-mediated Isothermal Amplification LAMP Assays for the Species-specific Detection of Eimeria that Infect Chickens
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RACK1 evolved species-specific multifunctionality in translational control through sequence plasticity within a loop

Madeline G Rollins1, Sujata Jha1, Elizabeth T Bartom2

  • 1Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.

Journal of Cell Science
|May 24, 2019
PubMed
Summary

The RACK1 protein

Keywords:
EIF6EvolutionRACK1RibosomeTranslation

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Receptor of activated protein C kinase 1 (RACK1) is a conserved protein involved in mRNA translation.
  • The precise mechanisms by which RACK1 regulates translation are not fully understood.

Purpose of the Study:

  • To investigate how variations in the RACK1 protein structure influence its function in mRNA translation across different species.
  • To identify specific structural features of RACK1 responsible for distinct regulatory roles.

Main Methods:

  • Utilized mutant and chimera RACK1 proteins to analyze functional differences.
  • Employed phylogenetic analysis to study evolutionary conservation and divergence of RACK1.
  • Investigated RACK1 interactions with eukaryotic initiation factor 6 (eIF6).

Main Results:

  • A variable loop region in RACK1 controls species-specific translational functions.
  • This loop modulates interactions with eIF6, impacting 60S biogenesis and ribosome assembly.
  • Conserved negative charges in the loop of protists and plants, reintroduced in mammals via poxviruses, enhance translation of specific mRNA types.

Conclusions:

  • Sequence plasticity in the RACK1 loop allows for diverse roles in translational control.
  • RACK1's multifunctionality in translation is shaped by evolutionary adaptations and inter-species interactions.