Plant coilin: structural characteristics and RNA-binding properties.

Area of Science:

• Molecular Biology
• Plant Science
• Cell Biology

Background:

• Cajal bodies (CBs) are essential subnuclear compartments for ribonucleoprotein biogenesis.
• Coilin is a key structural scaffolding protein critical for CB formation and function.
• Understanding coilin's structure-function relationship is vital for comprehending CB dynamics.

Purpose of the Study:

• To investigate the domain organization and RNA-binding properties of Arabidopsis thaliana coilin (Atcoilin).
• To elucidate the role of RNA interaction in Atcoilin multimerization and scaffolding function.
• To propose a model for the N-terminal domain of Atcoilin.

Main Methods:

• Analysis of deletion mutants to determine Atcoilin's physical properties and domain structure.
• Characterization of Atcoilin's RNA-binding capabilities and identification of RNA-binding sites.
• Investigating the effects of RNA interaction on Atcoilin multimerization.

Main Results:

• Atcoilin possesses a three-domain structure: N-terminal globular, central disordered, and C-terminal with a Tudor-like region.
• Atcoilin exhibits non-specific RNA binding through three distinct sites located in the N-terminal and central domains.
• RNA binding induces Atcoilin multimerization, potentially through structural changes in the N-terminal domain.

Conclusions:

• Atcoilin's domain organization is conserved across species, suggesting a common functional mechanism.
• RNA binding and subsequent multimerization are key to Atcoilin's scaffolding function in Cajal bodies.
• A structural model of the Atcoilin N-terminal domain provides insights into its molecular interactions.