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Specific interaction between human parechovirus nonstructural 2A protein and viral RNA
Olga Samuilova1, Camilla Krogerus, Tuija Pöyry
1Department of Virology, Haartman Institute, University of Helsinki, P. O. Box 21, FIN-00014 Helsinki, Finland. olga.samuilova@helsinki.fi
The Journal of Biological Chemistry
|July 1, 2004
Summary
The human parechovirus 1 2A protein binds to viral 3' untranslated region (UTR) RNA. This RNA-binding activity, identified through various experiments, may be crucial for the virus
Area of Science:
- Virology
- Molecular Biology
Background:
- Nonstructural 2A protein function varies across picornaviruses.
- Human parechovirus 1 (HPEV1) 2A protein lacks known proteolytic activity, with its function unidentified.
- Investigating HPEV1 2A's role in the viral life cycle is essential.
Purpose of the Study:
- To elucidate the function of the HPEV1 2A protein.
- To determine the subcellular localization and RNA-binding capabilities of HPEV1 2A.
Main Methods:
- Expression of HPEV1 2A in E. coli and antibody generation.
- Immunofluorescence microscopy for subcellular localization.
- Northwestern blot, UV cross-linking, and gel retardation assays for RNA binding.
- Mutagenesis to identify RNA-binding regions.
Main Results:
- HPEV1 2A localizes to the cytoplasm, perinuclear area, and nucleus (late stages).
- Viral RNA partially colocalizes with 2A in the perinuclear region.
- HPEV1 2A exhibits RNA binding activity, with highest affinity for the 3'-untranslated region (UTR) of the viral genome.
- Specific N- and C-terminal regions of 2A are essential for RNA binding.
- 2A also binds double-stranded RNA containing 3'UTR sequences.
Conclusions:
- HPEV1 2A possesses RNA binding activity, specifically to the viral 3'UTR.
- This RNA-binding function is a key characteristic of HPEV1 2A.
- The identified RNA binding may play a significant role in HPEV1 replication.