Recognition of double-stranded RNA by proteins and small molecules

Area of Science:

• Molecular biology
• Biochemistry
• Structural biology

Background:

• Double-stranded RNA (dsRNA) recognition is crucial for cellular processes like RNA metabolism and antiviral responses.
• The double-stranded RNA-binding motif (dsRBM) is a conserved domain in proteins that interact with dsRNA.
• Understanding dsRNA-protein interactions is key to controlling biological pathways.

Purpose of the Study:

• To review dsRNA-binding proteins, focusing on the dsRBM.
• To highlight recent findings on the selective binding of dsRBMs to dsRNA.
• To introduce novel small molecules for controlling dsRBM-RNA interactions.

Main Methods:

• Review of literature on dsRNA-binding proteins and dsRBMs.
• Analysis of the functional roles of dsRBM-containing proteins like PKR and ADAR2.
• Design and characterization of peptide-acridine conjugates (PACs) as dsRNA-binding agents.

Main Results:

• dsRBMs exhibit selectivity for specific sites on dsRNA.
• The RNA-dependent protein kinase (PKR) and adenosine deaminase acting on dsRNA 2 (ADAR2) exemplify dsRBM-mediated RNA selectivity.
• Peptide-acridine conjugates (PACs) are designed to exploit dsRNA groove characteristics for selective binding.

Conclusions:

• dsRBMs possess inherent selectivity for dsRNA structures.
• Targeted modulation of dsRBM-RNA interactions is achievable through novel small molecules like PACs.
• This research advances the understanding and control of critical RNA-mediated biological processes.