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The La protein-RNA complex surfaces
Richard J Maraia1, Mark A Bayfield
1Laboratory of Molecular Growth Regulation, National Institute of Child Health and Human Development, National Institutes of Health, 31 Center Drive, 2A25, Bethesda, Maryland 20892, USA. maraiar@mail.nih.gov
Molecular Cell
|January 24, 2006
Summary
The La protein binds RNA using unusual surfaces on its motifs, not the typical ones. This leaves standard binding sites free for other interactions, explaining its diverse roles.
Area of Science:
- Molecular biology
- Biochemistry
- Structural biology
Background:
- The La protein is a ubiquitous nuclear phosphoprotein with diverse functions.
- It contains RNA recognition motifs (RRMs) and winged-helix motifs, typically involved in nucleic acid binding.
Discussion:
- This study reveals that the La protein utilizes unconventional binding surfaces on its RRMs and winged-helix motifs to recognize its primary ligand, 3' UUU-OH.
- The typical nucleic acid binding surfaces remain unoccupied, suggesting their availability for other interactions.
- This unique binding mode provides a structural basis for the multifaceted roles of the La protein.
Key Insights:
- La protein employs non-canonical binding sites on its motifs for 3' UUU-OH recognition.
- Standard nucleic acid binding surfaces are available for additional molecular interactions.
- This explains the protein's diverse functions beyond snRNA 3' end protection.
Outlook:
- Further research can explore the specific interactions mediated by the unoccupied binding surfaces.
- Investigating these interactions may uncover novel roles in mRNA processing, RNA chaperoning, and DNA/chromatin association.
- Understanding La's binding flexibility could lead to new therapeutic strategies targeting RNA-related processes.