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Structures of pentatricopeptide repeat proteins.

Anuradha Pullakhandam1, Crystal Cooper2, Ian D Small1

  • 1School of Molecular Sciences, The University of Western Australia, Crawley, Western Australia, Australia.

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Summary

Pentatricopeptide repeat (PPR) proteins are key to plant gene expression. This study analyzes all available PPR crystal structures, revealing insights into RNA binding and programmable targeting for synthetic biology applications.

Keywords:
RNA recognitionorganellar gene expressionpentatricopeptide repeat proteinsprotein crystallographysynthetic biology

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Plant Science

Background:

  • Pentatricopeptide repeat (PPR) proteins form the largest RNA-binding protein family in land plants.
  • They are essential for organellar gene expression via sequence-specific RNA recognition.

Purpose of the Study:

  • To catalogue and analyze all deposited PPR crystal structures.
  • To elucidate the structural basis of PPR protein function in RNA recognition and targeting.

Main Methods:

  • Comprehensive survey of 30 PPR and 83 ribosomal PPR crystal or cryo-EM structures from the Protein Data Bank.
  • Analysis of crystallographic properties and structural features of native and designer PPR proteins.

Main Results:

  • Elucidation of the PPR RNA recognition code.
  • Characterization of conformational changes upon RNA binding.
  • Demonstration of the modular architecture enabling programmable RNA targeting.

Conclusions:

  • PPR structures provide critical insights into RNA binding and function.
  • Designer PPR proteins serve as valuable synthetic biology tools.
  • This structural catalogue is a key resource for plant biologists and crystallographers.