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Alphavirus entry: NRAMP leads the way.

Katie M Stiles1, Margaret Kielian

  • 1Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.

Cell Host & Microbe
|August 17, 2011
PubMed
Summary

Researchers identified NRAMP, an iron transporter, as a key receptor for Sindbis virus entry into host cells. This discovery advances understanding of alphavirus infection mechanisms in both insects and mammals.

Area of Science:

  • Virology
  • Cell Biology
  • Molecular Biology

Background:

  • Alphavirus (e.g., Sindbis virus) entry into host cells is crucial for infection but the specific host receptors involved remain largely unidentified.
  • Understanding alphavirus entry mechanisms is vital for developing antiviral strategies.

Discussion:

  • This study utilized a Drosophila RNA interference (RNAi) screen to identify host factors mediating alphavirus infection.
  • The screen identified NRAMP (Natural resistance-associated macrophage protein), an iron transporter, as a critical factor for Sindbis virus entry.

Key Insights:

  • NRAMP, an iron transporter with 12 transmembrane domains, functions as a receptor for Sindbis virus.
  • This receptor role for NRAMP was confirmed in both insect and mammalian cell lines, indicating conserved function across species.

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  • The identification of NRAMP provides a molecular target for understanding and potentially blocking alphavirus infections.

    • Outlook:

    • Further research can explore the precise mechanism by which NRAMP facilitates Sindbis virus entry.
    • Investigating NRAMP's role in the entry of other alphaviruses could reveal broader implications for the virus family.
    • Targeting NRAMP may offer a novel therapeutic strategy against alphavirus infections.