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Membranotropic regions of the dengue virus prM protein
Henrique Nemésio1, José Villalaín
1Instituto de Biología Molecular y Celular, Universidad "Miguel Hernández" , E-03202 Elche-Alicante, Spain.
Abstract:
The Dengue virus (DENV) prM protein consists of two moieties, the pr and M domains. Apart from preventing the premature fusion activity of the DENV E protein, prM has several other unknown biological roles, displaying both protein-protein and membrane-protein interactions. Although the prM protein is an essential component of the DENV viral cycle, little is known about its biological functions and what regions of this protein are responsible for said functions. By performing an exhaustive study of membrane rupture induced by a prM peptide library on simple and complex model membranes as well as their ability to modulate the phospholipid phase transitions of 1,2-dimyristoyl-sn-glycero-3-phosphatidylcholine and 1,2-dimyristoyl-sn-glycero-3-[phospho-rac-glycerol], we identified six membranotropic regions on the prM protein. Apart from the previously identified two transmembrane segments of the protein, one of these regions probably interacts with the fusion E protein and another one, the stem segment, would interact with the membrane modulating its structure. These data will help us understand the molecular mechanism of viral entry and morphogenesis, allow the identification of new targets for the treatment of Dengue virus infection, and make possible the future development of DENV entry inhibitors.
Insights
Researchers identified six key regions on the Dengue virus (DENV) prM protein that interact with membranes. These findings advance understanding of viral entry and could lead to new Dengue virus infection treatments.
Area of Science:
- Virology
- Molecular Biology
- Membrane Biophysics
Background:
- The Dengue virus (DENV) prM protein is crucial for the viral cycle, but its functions and specific interacting regions remain largely unknown.
- prM protein interactions with other viral proteins and host membranes are implicated in viral entry and morphogenesis.
- Understanding prM's role is vital for developing therapeutic strategies against Dengue virus infection.
Purpose of the Study:
- To identify functional regions of the Dengue virus (DENV) prM protein involved in membrane interactions.
- To investigate the role of prM protein in membrane rupture and modulation of phospholipid phase transitions.
- To elucidate the molecular mechanisms underlying DENV entry and morphogenesis.
Main Methods:
- A prM peptide library was used to study membrane rupture on model membranes.
- Phospholipid phase transitions of specific phosphatidylcholines were modulated and analyzed.
- Membranotropic regions and their potential interactions with the DENV E protein and membranes were identified.
Main Results:
- Six membranotropic regions on the Dengue virus (DENV) prM protein were identified.
- Two transmembrane segments were confirmed, alongside a novel region likely interacting with the E protein.
- The stem segment was identified as a potential membrane-interacting region modulating membrane structure.
Conclusions:
- The study reveals critical membranotropic regions of the DENV prM protein, advancing understanding of viral mechanisms.
- Identified regions offer potential targets for developing Dengue virus entry inhibitors.
- These findings contribute to understanding viral entry, morphogenesis, and potential therapeutic interventions for Dengue virus infection.
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