The RNA-Binding Properties of Annexins

Area of Science:

• Molecular Biology
• Biophysics
• Computational Biology

Background:

• Annexins are calcium-dependent phospholipid-binding proteins involved in vital cellular functions.
• The RNA-binding capacity of Annexins is not widely recognized, necessitating further investigation.

Purpose of the Study:

• To clarify the role of Annexins in RNA binding using integrated experimental and computational approaches.
• To identify specific mRNA partners and structural regions involved in Annexin-RNA interactions.
• To explore the implications of Annexin biophysical properties, such as phase separation, in cellular processes.

Main Methods:

• Utilized the catRAPID algorithm for predicting RNA-binding partners of Annexins.
• Performed experimental validation to confirm predicted Annexin-RNA interactions.
• Constructed a virtual library to identify mRNA partners for Annexin A2 and its binding regions.

Main Results:

• Accurately predicted known RNA-binding partners of Annexins, validated experimentally.
• Identified specific structural regions in Annexin A2 responsible for RNA binding.
• Observed phase separation tendencies in Annexins A7 and A11, linked to their N-termini.

Conclusions:

• Annexins possess significant RNA-binding capabilities, impacting RNA regulation and cellular compartmentalization.
• Annexin-mediated phase separation may play a role in RNA trafficking and localization, particularly in neurons.
• The catRAPID algorithm serves as a powerful tool for predicting RNA-binding properties of proteins.