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Updated: May 11, 2026

Alphavirus Transducing System: Tools for Visualizing Infection in Mosquito Vectors
Published on: November 24, 2010
Functional characterization of the alphavirus TF protein
Jonathan E Snyder1, Kirsten A Kulcsar, Kimberly L W Schultz
1Markey Center for Structural Biology, Department of Biological Sciences, Purdue University, West Lafayette, Indiana, USA.
A newly discovered alphavirus protein, transframe (TF), is produced via ribosomal frameshifting. While not essential for replication, TF significantly impacts virus particle release and virulence in vivo.
Area of Science:
- Virology
- Molecular Biology
- Structural Biology
Background:
- Alphavirus replication traditionally involves four structural proteins: capsid, pE2, 6K, and E1.
- Bioinformatic analyses suggested a ribosomal frameshifting event during 6K gene translation, producing a novel protein, transframe (TF).
Purpose of the Study:
- To validate the production of the TF protein.
- To characterize the function of TF in alphavirus replication and pathogenesis.
Main Methods:
- Mass spectrometry to identify TF in Sindbis and Chikungunya virus particles.
- Construction and analysis of Sindbis virus mutants affecting TF production, size, or sequence.
- In vitro and in vivo assays, including neuropathogenesis models in mice.
Main Results:
- TF was identified in purified Sindbis and Chikungunya virus particles.
- Disrupting TF production decreased virus particle release in mammalian and insect cells.
- TF mutants showed significantly reduced mortality in a mouse neuropathogenesis model compared to wild-type virus.
- TF retains ion-channel activity and does not affect genome replication or particle infectivity.
Conclusions:
- The transframe (TF) protein is a previously uncharacterized factor crucial for alphavirus assembly and pathogenesis.
- TF plays a significant role in virus particle release and in vivo virulence.
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