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SARS-COV-2 Spike RBD (N501Y) Protein

Product Info

Recombinant SARS-COV-2 Spike RBD (N501Y) Protein is expressed from Expi293 with His tag at the C-terminal. It contains Arg319-Phe541(N501Y).[Accession | QHD43416.1]

Molecular Weight

The protein has a predicted MW of 26.2 kDa. Due to glycosylation, the protein migrates to 36-40 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-COV-2 Spike RBD (N501Y) on Tris-Bis PAGE under reduced condition. The purity is greater than 95%.


The purity of SARS-COV-2 Spike RBD (N501Y) is greater than 95% as determined by SEC-HPLC.


Immobilized SARS-COV-2 Spike RBD (N501Y), His Tag at 0.5μg/ml (100μl/Well) on the plate. Dose response curve for Human ACE2, hFc Tag with the EC50 of 12.7ng/ml determined by ELISA.

SPR Data

Human ACE2 captured on Protein A chip, can bind SARS-COV-2 Spike RBD(N501Y), His Tag with an affinity constant of 1.74nM as determined in a SPR assay (Biacore T200).


The ongoing coronavirus disease 2019 (COVID-19) pandemic has prioritized the development of small-animal models for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The resulting mouse-adapted strain at passage 6 (called MASCp6) showed increased infectivity in mouse lung and led to interstitial pneumonia and inflammatory responses in both young and aged mice after intranasal inoculation. Deep sequencing revealed a panel of adaptive mutations potentially associated with the increased virulence. In particular, the N501Y mutation is located at the receptor binding domain (RBD) of the spike protein.


S protein RBD; S glycoprotein RBD; Spike protein RBD


(1)Gu H, Chen Q, Yang G, He L, Fan H, Deng YQ, Wang Y, Teng Y, Zhao Z, Cui Y, Li Y, Li XF, Li J, Zhang NN, Yang X, Chen S, Guo Y, Zhao G, Wang X, Luo DY, Wang H, Yang X, Li Y, Han G, He Y, Zhou X, Geng S, Sheng X, Jiang S, Sun S, Qin CF, Zhou Y. Adaptation of SARS-CoV-2 in BALB/c mice for testing vaccine efficacy. Science. 2020 Sep 25;369(6511):1603-1607. doi: 10.1126/science.abc4730. Epub 2020 Jul 30. PMID: 32732280; PMCID: PMC7574913.

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