Searching for a Match: Structure, Function and Application of Sequence-Specific RNA-Binding Proteins

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.