Related Experiment Videos
Promoter structure of the MxA gene that confers resistance to influenza virus
1Department of Biomolecular Engineering, Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama, Japan.
Abstract:
The human MxA protein is one of the interferon-inducible proteins that inhibits multiplication of influenza virus and other viruses. To clarify the control mechanism of its expression, we prepared a series of mutant MxA promoters and identified a 30 nucleotides long cis-acting interferon-responsive element by transient transfection assay. Its nucleotide sequence is somewhat similar to that of ISRE (interferon-stimulated response element), suggesting that the regulation of MxA mRNA synthesis is under the control of some ISRE binding factor such as ISGF-3 (interferon-stimulated gene factor-3).
Insights
Researchers identified a key DNA sequence that controls the expression of MxA protein, an important antiviral factor. This finding sheds light on how the body fights off viruses like influenza.
Area of Science:
- Virology
- Molecular Biology
- Immunology
Background:
- The MxA protein is an interferon-inducible protein known to inhibit the replication of various viruses, including influenza.
- Understanding the regulatory mechanisms controlling MxA expression is crucial for comprehending innate antiviral responses.
Purpose of the Study:
- To elucidate the control mechanism governing the expression of the human MxA protein.
- To identify the specific DNA elements responsible for interferon-induced MxA gene regulation.
Main Methods:
- Construction and analysis of a series of mutant MxA promoters.
- Transient transfection assays to evaluate promoter activity.
- Sequence comparison with known regulatory elements.
Main Results:
- A 30-nucleotide cis-acting element within the MxA promoter was identified as crucial for interferon responsiveness.
- This element shares sequence similarity with the interferon-stimulated response element (ISRE).
Conclusions:
- The identified MxA promoter element is essential for interferon-mediated gene induction.
- Regulation of MxA mRNA synthesis likely involves ISRE binding factors, such as interferon-stimulated gene factor-3 (ISGF-3).