Recombinant Junin arenavirus Pre-glycoprotein polyprotein GP complex (GPC)
Description
Structure and Processing of GPC
The GPC is processed into three chains :
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Stable Signal Peptide (SSP) Association of the SSP is essential for intracellular trafficking and proteolytic maturation of the GPC complex . The SSP interacts with the cytosolic domain of GP2 and is retained as part of the mature GPC .
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Glycoprotein G1 (GP1)
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Glycoprotein G2 (GP2) GP2 facilitates the virus's entry into host cells through pH-induced fusion of the viral and endosomal membranes .
Role of Glycosylation
Specific N-linked glycans on the arenavirus surface glycoprotein (GP) mask important epitopes and help the virus evade antibody responses . The N-linked glycosylation profiles of arenavirus glycoproteins are viable targets for designing attenuated viruses for vaccine development against arenavirus-associated illnesses . Glycans facilitate the virus to evade neutralizing antibodies .
Functional Significance
The GPC complex is essential for the virus's infectivity . The stable signal peptide (SSP) plays a crucial role in intracellular trafficking and proteolytic maturation of the GPC complex . A charged residue in SSP, lysine 33, is specifically required for the fusion activity of the GPC complex .
GPC as a Vaccine Target
The GPC is a key target for vaccine development against arenaviruses . Mutations within GPC can attenuate the virus and increase immunogenicity . Antibodies directed against the GPC can neutralize the virus by altering virion binding/fusion . Specific mutations acquired early during serial passaging attenuate visceral disease while not impacting the neurovirulence of the Junin virus .
GPC and SKI-1/S1P Protease
Arenaviruses, including Junin virus, utilize the SKI-1/S1P protease for GPC processing, which is essential for virus growth in cell culture . The SKI-1/S1P protease mediates the major cleavage step for generating mature surface glycoproteins .
Research Findings on GPC Mutations
| Virus Clone | GPC Mutations | Visceral Disease | Neurovirulence | Attenuation |
|---|---|---|---|---|
| rRom | None | Lethal | Yes | No |
| rRom/GPC-R484G | R484G | Lethal | Yes | No |
| rRom/GPC-XJ13 | XJ13-specific | No | Yes | Partial |
| rRom/GPC-XJ44 | XJ44-specific | Delayed onset | Yes | Yes |
| rRom/GPC-T168A | T168A | Delayed onset | Yes | Yes |
Product Specs
Note: While we prioritize shipping the format currently in stock, please specify your preferred format in order notes for customized preparation.
Note: All proteins are shipped with standard blue ice packs. Dry ice shipping requires advance notice and incurs additional charges.
The tag type is determined during the production process. If you require a specific tag, please inform us, and we will prioritize its development.
