Recombinant SARS-CoV-2 (2019-nCoV) Spike S2 ECD Protein(mFc Tag)


Spike glycoprotein, Spike S2 subunit extracellular domain



Cat. No.:

CSI99014 pdf (datasheet)


100 µg


$540.00 BUY


The spike (S) glycoprotein of coronaviruses contains protrusions that will only bind to certain receptors on the host cell. Known receptors that bind S1 are ACE2, angiotensinconverting enzyme 2; DPP4, dipeptidyl peptidase-4; APN, aminopeptidase N; CEACAM, carcinoembryonic antigen-related cell adhesion molecule 1; Sia, sialic acid; O-ac Sia, Oacetylated sialic acid. The spike is essential for both host specificity and viral infectivity. The spike (S) glycoprotein of coronaviruses is known to be essential in the binding of the virus to the host cell at the advent of the infection process. It's been reported that SARSCoV-2 (COVID-19 coronavirus, 2019-nCoV) can infect the human respiratory epithelial cells through interaction with the human ACE2 receptor. The spike protein is a large type I transmembrane protein containing two subunits, S1 and S2. S1 mainly contains a receptor binding domain (RBD), which is responsible for recognizing the cell surface receptor. S2 mediates fusion of the virion and cellular membranes by acting as a class I viral fusion protein. The S protein plays key parts in the induction of neutralizing-antibody and T-cell responses, as well as protective immunity. The main functions for the Spike protein are summarized as: Mediate receptor binding and membrane fusion; Defines the range of the hosts and specificity of the virus; Main component to bind with the neutralizing antibody; Key target for vaccine design; Can be transmitted between different hosts through gene recombination or mutation of the receptor binding domain (RBD), leading to a higher mortality rate.

Uniprot Name:

Spike glycoprotein

Uniprot ID:



Sf9 insect cells

Molecular Weight:

The recombinant SARS-CoV-2 (2019-nCoV) Spike S2 ECD Protein (mFc tag) consists of 762 amino acids with a predicted molecular mass of 84.33 kDa.




Lyophilized from sterile 20mM Tris, 300mM NaCl, 100mM glycine, pH 7.0.
Normally 5% - 8% trehalose, mannitol and 0.01% Tween80 are added as protectants before lyophilization.


>95% as determined by SDS-PAGE

Biological Activity:

Testing progress.

Endotoxin Level:

<1.0 EU per μg protein as determined by the LAL method


Centrifuge vial prior to opening. Add sterile distilled water to a concentration of 0.1 mg/mL and gently pipette the solution up and down the sides of the vial. DO NOT VORTEX. Allow several minutes for complete reconstitution.


Stable for up to 1 year from date of receipt at -20°C to -80°C After reconstitution, store working aliquots at -20°C to -80°C. Avoid repeated freeze-thaw cycles.