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Updated: Aug 1, 2026

Protein Purification-free Method of Binding Affinity Determination by Microscale Thermophoresis
Published on: August 15, 2013
Sendai virus C protein physically associates with Stat1
K Takeuchi1, T Komatsu, J Yokoo
1Department of Microbiology, Fukui Medical University, Shimoaizuki 23-3, Matsuoka-cho, Yoshida-gun, Fukui 910-1193, Japan.
Sendai virus C protein binds to Signal transducer and activator of transcription 1 (Stat1), forming large complexes. This interaction inhibits interferon-stimulated gene activation, revealing a key viral immune evasion mechanism.
Area of Science:
- Virology
- Immunology
- Molecular Biology
Background:
- Sendai virus (SeV) C protein counteracts interferon (IFN) antiviral responses.
- SeV C protein inhibits IFN signaling and the activation of IFN-stimulated genes.
- The precise molecular mechanism of SeV C protein's IFN antagonism is not fully understood.
Purpose of the Study:
- To investigate the molecular mechanism by which SeV C protein inhibits IFN signaling.
- To determine if SeV C protein directly interacts with components of the IFN signaling pathway.
Main Methods:
- Analysis of infected cell extracts using low and high salt conditions.
- Use of recombinant vaccinia viruses to express individual SeV genes.
- Co-precipitation assays with anti-C antibody.
Main Results:
- Unphosphorylated and phosphorylated Stat1 formed high molecular weight complexes (HMWCs) in SeV-infected cells.
- Only SeV C protein expression induced Stat1-HMWC formation.
- SeV C protein physically associated with Stat1, suggesting direct interaction.
Conclusions:
- SeV C protein directly binds to Stat1.
- This physical association likely inhibits Stat1 activity, thereby blocking IFN-stimulated gene transcription.
- SeV C protein employs Stat1 interaction as a strategy for immune evasion.
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