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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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Cytosolic RGG RNA-binding proteins are temperature sensitive flowering time regulators in Arabidopsis.

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Area of Science:

  • Molecular Biology
  • Plant Science
  • Genetics

Background:

  • mRNA translation is regulated by RNA-binding proteins (RBPs).
  • Homologues of yeast (ScStm1) and human (HsSERBP1) proteins are found in plants.
  • The RGG motif is present in multifunctional translation regulators.

Purpose of the Study:

  • Characterize the RGG motif-containing RBP family in Arabidopsis thaliana.
  • Investigate the function of Arabidopsis RGG proteins (AtRGGs) in development.
  • Determine the role of AtRGGs in regulating flowering time and response to environmental conditions.

Main Methods:

  • Genome-wide identification of RGG proteins in Arabidopsis.
  • Expression analysis of AtRGGA, AtRGGB, and AtRGGC.
  • Subcellular localization studies and RNA-binding assays.
  • Protein-interactome analysis using mass spectrometry.
  • Analysis of mutant phenotypes, including flowering time under different temperatures.

Main Results:

  • Arabidopsis has three RGG proteins: AtRGGA, AtRGGB, and AtRGGC, with distinct expression patterns.
  • AtRGGs localize to the cytoplasm and bind ssRNA with high affinity.
  • AtRGGs interact with ribosomal proteins and RNA processing/transport factors.
  • AtRGGs are found in ribosome-free fractions, indicating plant-specific functions.
  • AtRGGs differentially regulate flowering time with temperature-dependent effects.

Conclusions:

  • AtRGG proteins are involved in fine-tuning translation efficiency.
  • These proteins play a role in controlling flowering time in response to environmental cues.
  • AtRGGs likely have additional plant-specific functions in development and environmental adaptation.