SARS-COV-2 S trimer Protein (BA.2, HEK293, His)

The SARS-CoV-2 S glycoprotein is critical in infection, binding to the ACE2 receptor and allowing viral particles to attach to the host cell membrane. Cleavage of S2/S2′ triggers cell membrane fusion or internalization via endocytosis. SARS-COV-2 S trimer Protein (BA.2, HEK293, His) is the recombinant virus-derived SARS-COV-2 S trimer protein, expressed by HEK293, with C-His labeled tag, mutations, and furin cleavage site mutants.

The SARS-CoV-2 S glycoprotein plays a crucial role in infection by attaching the virion to the host cell membrane through interaction with the primary receptor, host ACE2. Upon cleavage of S2/S2', binding to the ACE2 receptor initiates either direct fusion at the cell membrane or internalization of the virus via endocytosis, leading to fusion of the virion membrane with the host endosomal membrane. Additionally, the glycoprotein may utilize NRP1/NRP2 and integrin as alternative entry receptors, possibly explaining the virus's tropism in human olfactory epithelial cells. The stalk domain of S exhibits three hinges, providing unexpected orientational freedom to the head. Acting as a class I viral fusion protein, the glycoprotein undergoes an extensive and irreversible conformational change during virus entry, triggered by host TMPRSS2 or CSTL, leading to fusion of the viral envelope with the cellular cytoplasmic membrane and release of viral genomic RNA into the host cell cytoplasm. The glycoprotein exhibits at least three conformational states: pre-fusion native, pre-hairpin intermediate, and post-fusion hairpin, with the coiled coil regions adopting a trimer-of-hairpins structure during fusion, facilitating the apposition and subsequent fusion of viral and target cell membranes.

Immobilized ACE2 Protein, Human, Recombinant (mFc Tag) at 2 μg/mL (100 μL/well) can bind SARS-CoV 2 (BA.2) Spike S1+S2 trimer Protein (ECD, His Tag), the EC₅₀ is 11.3ng/mL

Virus

HEK293

C-His

P0DTC2 (V16-Q1208, with mutations F817P, A892P, A899P, A942P, K986P, V987P, T19I, L24S, del25-27, G142D, V213G, G339D, S371F, S373P, S375F, T376A, D405N, R408S, K417N, N440K, S477N, T478K, E484A, Q493R, Q498R, N501Y, Y505H, D614G, H655Y, N679K, P681H, N764K, D796Y, Q954H, N969K and furin cleavage site mutants)

43740568

Partial

Approximately 150-200 kDa.

Greater than 90% as determined by SDS-PAGE PAGE.

Solution

Supplied as a 0.2 μm filtered solution of sodium citrate buffer system, pH 6.0.

<1 EU/μg, determined by LAL method.

N/A.

Stored at -80°C for 1 year from date of receipt. It is stable at -20°C for 3 months after opening. It is recommended to freeze aliquots at -80°C for extended storage. Avoid repeated freeze-thaw cycles.

Shipping with dry ice.