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Updated: Oct 29, 2025
Modeling The Lifecycle Of Ebola Virus Under Biosafety Level 2 Conditions With Virus-like Particles Containing Tetracistronic Minigenomes
Published on: September 27, 2014
Non-canonical proline-tyrosine interactions with multiple host proteins regulate Ebola virus infection
Jyoti Batra1,2,3, Hiroyuki Mori4, Gabriel I Small5,6
1J. David Gladstone Institutes, San Francisco, CA, USA.
Abstract:
The Ebola virus VP30 protein interacts with the viral nucleoprotein and with host protein RBBP6 via PPxPxY motifs that adopt non-canonical orientations, as compared to other proline-rich motifs. An affinity tag-purification mass spectrometry approach identified additional PPxPxY-containing host proteins hnRNP L, hnRNPUL1, and PEG10, as VP30 interactors. hnRNP L and PEG10, like RBBP6, inhibit viral RNA synthesis and EBOV infection, whereas hnRNPUL1 enhances. RBBP6 and hnRNP L modulate VP30 phosphorylation, increase viral transcription, and exert additive effects on viral RNA synthesis. PEG10 has more modest inhibitory effects on EBOV replication. hnRNPUL1 positively affects viral RNA synthesis but in a VP30-independent manner. Binding studies demonstrate variable capacity of the PPxPxY motifs from these proteins to bind VP30, define PxPPPPxY as an optimal binding motif, and identify the fifth proline and the tyrosine as most critical for interaction. Competition binding and hydrogen-deuterium exchange mass spectrometry studies demonstrate that each protein binds a similar interface on VP30. VP30 therefore presents a novel proline recognition domain that is targeted by multiple host proteins to modulate viral transcription.
Insights
Ebola virus VP30 protein interacts with host proteins via unique motifs, affecting viral RNA synthesis. Some host factors inhibit viral replication, while others enhance it, revealing a novel VP30 proline recognition domain.
Area of Science:
- Virology
- Molecular Biology
- Protein-Protein Interactions
Background:
- The Ebola virus VP30 protein is crucial for viral transcription.
- VP30 interacts with host factors, but the mechanisms and consequences are not fully understood.
- Proline-rich motifs are common in protein interactions, but their role in VP30 interactions is under investigation.
Purpose of the Study:
- To identify host proteins interacting with Ebola virus VP30.
- To characterize the binding motifs and interfaces involved in VP30-host protein interactions.
- To determine the functional impact of these interactions on viral RNA synthesis and replication.
Main Methods:
- Affinity tag-purification mass spectrometry to identify VP30 interactors.
- In vitro binding studies to characterize PPxPxY motif interactions with VP30.
- Hydrogen-deuterium exchange mass spectrometry to map VP30 binding interfaces.
- Assays to measure viral RNA synthesis and EBOV infection in the presence of host proteins.
Main Results:
- Identified RBBP6, hnRNP L, hnRNPUL1, and PEG10 as VP30 interactors through PPxPxY motifs.
- RBBP6, hnRNP L, and PEG10 inhibit viral RNA synthesis and EBOV infection, while hnRNPUL1 enhances it.
- Defined PxPPPPxY as an optimal binding motif, with the fifth proline and tyrosine being critical for VP30 interaction.
- Demonstrated that these host proteins bind to a common interface on VP30, modulating VP30 phosphorylation and viral transcription.
Conclusions:
- Ebola virus VP30 possesses a novel proline recognition domain targeted by multiple host proteins.
- Host protein interactions with VP30 significantly modulate viral transcription and replication, with both inhibitory and enhancing effects observed.
- Understanding these interactions provides insights into viral pathogenesis and potential therapeutic strategies against Ebola virus.
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