MERS-CoV Spike/S1 Protein (HEK293, His)

The SARS-CoV Spike glycoprotein (S) has three subunits S1, S2' and S2 through alternative splicing. The engagement of the MERS-CoV spike protein S1 with CD26 (also known as dipeptidyl peptidase 4, DPP4) mediates viral attachment to host cells and virus鈥揷ell fusion, thereby initiating infection. S2 mediates fusion of the virion and cellular membranes by acting as a class I viral fusion protein and S2' is unmasked following S2 cleavage occurring upon virus endocytosis. MERS-CoV Spike/S1 Protein (HEK293, His) is the recombinant Virus-derived MERS-CoV Spike/S1 protein, expressed by HEK293 , with C-His labeled tag.

The MERS-CoV Spike glycoprotein (S) has three subunits S1, S2' and S2 through alternative splicing. S1 can attaches the virion to the cell membrane by interacting with host receptor, initiating the infection. S2' acts as a viral fusion peptide which is unmasked following S2 cleavage occurring upon virus endocytosis. S2 mediates fusion of the virion and cellular membranes by acting as a class I viral fusion protein.
Under the current model, S protein has at least three conformational states: pre-fusion native state, pre-hairpin intermediate state, and post-fusion hairpin state. During viral and target cell membrane fusion, the coiled coil regions (heptad repeats) assume a trimer-of-hairpins structure, positioning the fusion peptide in close proximity to the C-terminal region of the ectodomain. The formation of this structure appears to drive apposition and subsequent fusion of viral and target cell membranes.
The engagement of the MERS-CoV spike protein S1 with CD26 (also known as dipeptidyl peptidase 4, DPP4) mediates viral attachment to host cells and virus–cell fusion, thereby initiating infection^[1].

Measured by its binding ability in a functional ELISA. Immobilized Spike Protein S1 at 2 μg/mL (100 μL/well) can bind biotinylated DPP4-Fc and the EC₅₀ is 15-60 ng/mL.

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  MERS-CoV Spike/S1 Protein captured on CM5 Chip can bind CD26/Dipeptidyl Peptidase 4 Protein, Human (HY-P70017) with an affinity constant of 2.45E-7 M as determined in SPR assay (Biacore 8K).

Virus

HEK293

C-His

K0BRG7/AFS88936.1 (Y18-E725)

14254594  [NCBI]

Partial

YVDVGPDSVKSACIEVDIQQTFFDKTWPRPIDVSKADGIIYPQGRTYSNITITYQGLFPYQGDHGDMYVYSAGHATGTTPQKLFVANYSQDVKQFANGFVVRIGAAANSTGTVIISPSTSATIRKIYPAFMLGSSVGNFSDGKMGRFFNHTLVLLPDGCGTLLRAFYCILEPRSGNHCPAGNSYTSFATYHTPATDCSDGNYNRNASLNSFKEYFNLRNCTFMYTYNITEDEILEWFGITQTAQGVHLFSSRYVDLYGGNMFQFATLPVYDTIKYYSIIPHSIRSIQSDRKAWAAFYVYKLQPLTFLLDFSVDGYIRRAIDCGFNDLSQLHCSYESFDVESGVYSVSSFEAKPSGSVVEQAEGVECDFSPLLSGTPPQVYNFKRLVFTNCNYNLTKLLSLFSVNDFTCSQISPAAIASNCYSSLILDYFSYPLSMKSDLSVSSAGPISQFNYKQSFSNPTCLILATVPHNLTTITKPLKYSYINKCSRLLSDDRTEVPQLVNANQYSPCVSIVPSTVWEDGDYYRKQLSPLEGGGWLVASGSTVAMTEQLQMGFGITVQYGTDTNSVCPKLEFANDTKIASQLGNCVEYSLYGVSGRGVFQNCTAVGVRQQRFVYDAYQNLVGYYSDDGNYYCLRACVSVPVSVIYDKETKTHATLFGSVACEHISSTMSQYSRSTRSMLKRRDSTYGPLQTPVGCVLGLVNSSLFVE

Approximately 98 kDa

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  ≥ 95%, as determined by reducing SDS-PAGE.

Solution.

Supplied as a 0.22 μm filtered solution of PBS, pH 7.4.

<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.

• [1]. Lu G, et al. Molecular basis of binding between novel human coronavirus MERS-CoV and its receptor CD26. Nature. 2013 Aug 8;500(7461):227-31.  [Content Brief]