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Interferon-induced human MxA GTPase blocks nuclear import of Thogoto virus nucleocapsids
1Abteilung Virologie, Institut für Medizinische Mikrobiologie und Hygiene, Universität Freiburg, D-79008 Freiburg, Germany.
Abstract:
Interferon-induced human MxA protein belongs to the dynamin superfamily of large GTPases. It exhibits antiviral activity against a variety of RNA viruses, including Thogoto virus, an influenza virus-like orthomyxovirus transmitted by ticks. Here, we report that MxA blocks the transport of Thogoto virus nucleocapsids into the nucleus, thereby preventing transcription of the viral genome. This interaction can be abolished by a mAb that neutralizes the antiviral activity of MxA. Our results reveal an antiviral mechanism whereby an interferon-induced protein traps the incoming virus and interferes with proper transport of the viral genome to its ultimate target compartment within the infected cell.
Insights
The MxA protein, induced by interferon, acts as a potent antiviral agent. It effectively blocks Thogoto virus nucleocapsid transport into the cell nucleus, halting viral genome transcription and replication.
Area of Science:
- Virology
- Immunology
- Molecular Biology
Background:
- Interferon-induced MxA protein is a large GTPase with known antiviral properties.
- Thogoto virus is an orthomyxovirus transmitted by ticks, posing a potential public health concern.
Purpose of the Study:
- To elucidate the antiviral mechanism of human MxA protein against Thogoto virus.
- To investigate how MxA protein inhibits Thogoto virus replication.
Main Methods:
- Cell-based assays were used to study the interaction between MxA protein and Thogoto virus nucleocapsids.
- Monoclonal antibodies (mAbs) were employed to neutralize MxA's antiviral activity.
Main Results:
- MxA protein was found to inhibit Thogoto virus by blocking nucleocapsid transport into the host cell nucleus.
- This blockade prevents the transcription of the viral genome, thereby inhibiting viral replication.
- A neutralizing mAb demonstrated that the interaction between MxA and the virus is crucial for its antiviral effect.
Conclusions:
- MxA protein employs a novel antiviral strategy by trapping incoming viral nucleocapsids.
- Interference with viral genome transport to the nucleus is a key mechanism of MxA's antiviral activity.
- Targeting MxA-virus interactions could offer new therapeutic avenues against orthomyxoviruses.