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SARS Spike S1 Protein

Product Info

Recombinant SARS spike S1 protein is expressed from Expi293 with hFc tag and Avi tag at the C-terminal. It contains Ser14-Arg667.[Accession | P59594]

Molecular Weight

The protein has a predicted MW of 100.6 kDa. Due to glycosylation, the protein migrates to 120-140 kDa based on Tris-Bis PAGE result.


Less than 1EU per μg by the LAL method.


> 95% as determined by Tris-Bis PAGE
> 95% as determined by HPLC


Lyophilized from 0.22μm filtered solution in PBS (pH 7.4). Normally 5 % trehalose is added as protectant before lyophilization.


Centrifuge tubes before opening. Reconstituting to a concentration more than 100 μg/ml is recommended. Dissolve the lyophilized protein in distilled water.


The product should be stored at -70℃ or -20℃.

Assay Data
Tris-Bis PAGE

SARS Spike S1 on Tris-Bis PAGE under reduced condition. The purity is greater than 95%.


The purity of SARS spike S1 is greater than 95% as determined by SEC-HPLC.


Immobilized Human ACE2 at 2μg/ml (100μl/Well).Dose response curve for SARS Spike S1, hFc Tag with the EC50 of 0.39μg/ml determined by ELISA.


The spike protein (S) of coronavirus (CoV) attaches the virus to its cellular receptor, angiotensin-converting enzyme 2 (ACE2). A defined receptor-binding domain (RBD) on S mediates this interaction.The S protein plays key parts in the induction of neutralizing-antibody and T-cell responses, as well as protective immunity.


S1 protein; Spike protein S1; Spike,S1 protein; S glycoprotein Subunit1


(1)Belouzard S , Chu V C , Whittaker G R . Activation Of The Sars Coronavirus Spike Protein Via Sequential Proteolytic Cleavage At Two Distinct Sites[J]. Proceedings of the National Academy of Sciences of the United States of America, 2009, 106(14):5871-5876.

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