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Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins
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Searching for a Match: Structure, Function and Application of Sequence-Specific RNA-Binding Proteins.

Lauren K Dedow1, Julia Bailey-Serres1

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Plants utilize numerous RNA-binding proteins (RBPs), including pentatricopeptide repeat (PPR) and Pumilio/Fem-3 binding factors (PUF) proteins, to regulate gene expression. Their modular RNA-binding domains enable specific targeting for diverse biological processes.

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CRISPR-CasPentatricopeptide repeat proteinPumilio/fem-3 binding factorRNA binding protein

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Area of Science:

  • Molecular Biology
  • Plant Science
  • Genetics

Background:

  • Plants possess over 1800 RNA-binding proteins (RBPs) crucial for gene regulation, yet most remain uncharacterized.
  • Pentatricopeptide repeat (PPR) and Pumilio/Fem-3 binding factors (PUF) are key eukaryotic RBPs with modular structures for specific RNA sequence recognition.

Purpose of the Study:

  • To explore the roles and mechanisms of PPR and PUF proteins in plant gene regulation.
  • To highlight the potential of these RNA-targeting systems for biotechnological applications.

Main Methods:

  • Analysis of protein structure-function relationships in PPR and PUF families.
  • Comparative study of eukaryotic PPR/PUF systems with prokaryotic CRISPR-Cas systems.

Main Results:

  • PPR proteins, encoded in the nucleus, regulate post-transcriptional processes in plastids and mitochondria (splicing, translation, RNA editing).
  • Plant PUF proteins are involved in nuclear and cytoplasmic gene regulatory pathways.
  • The modularity of PPR and PUF proteins facilitates the identification of their RNA targets and functions.

Conclusions:

  • The specific RNA-targeting capabilities of PPR and PUF proteins offer significant potential for RNA-targeted engineering.
  • Understanding these systems provides insights into fundamental plant gene regulation and future biotechnological tools.