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Plant MutS2 proteins function in plastid ribosome quality control.

Amanda K Broz1, Kalia Kodrich1, Kasavajhala V S K Prasad1

  • 1Department of Biology, Colorado State University, Fort Collins, CO, USA.

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Arabidopsis chloroplasts use MutS2 proteins to resolve ribosome collisions during translation. These proteins are crucial for plant development and respond to translational stress.

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MutSMutS2homologous recombinationplastidribosome collisionsribosome-associated quality control (RQC)

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Genetics

Background:

  • Chloroplast translation requires tight regulation for plant growth and environmental responses.
  • Ribosome stalling and collisions during translation can negatively impact plant fitness.
  • Mechanisms of chloroplast response to translational stress are largely unknown.

Purpose of the Study:

  • To identify key proteins involved in plastid ribosome-associated quality control (RQC) in Arabidopsis.
  • To investigate the function of MutS2 proteins in resolving translational stress in chloroplasts.

Main Methods:

  • Genetic analysis of MutS2A and MutS2B in Arabidopsis.
  • Assessment of ribosome stalling and collisions under antibiotic stress.
  • Observation of tissue greening during de-etiolation.

Main Results:

  • MutS2A and MutS2B are essential for overcoming antibiotic-induced ribosome stalling and collisions.
  • These MutS2 proteins are vital for successful tissue greening during de-etiolation.
  • Evidence for homologous recombination function of MutS2 in plastids was weak.

Conclusions:

  • MutS2 proteins are central to resolving ribosome collisions in Arabidopsis chloroplasts.
  • These proteins play a critical role during periods of high translational demand, such as de-etiolation.
  • MutS2 proteins represent a conserved mechanism for translational quality control in photosynthetic eukaryotes.