Recombinant SARS-CoV-2 AY.1/AY.2 Spike RBD His Protein, CF

Name: Recombinant SARS-CoV-2 AY.1/AY.2 Spike RBD His Protein, CF
Brand: R&D Systems
SKU: 10905-CV

Catalog # 10905-CV

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Key Product Details

Source:	HEK293
Accession #:	YP_009724390.1
Applications:	Bioactivity

View Full Technical Details for Recombinant SARS-CoV-2 AY.1/AY.2 Spike RBD His Protein, CF

Product Specifications

Source	Human embryonic kidney cell, HEK293-derived sars-cov-2 Spike RBD protein Arg319-Phe541 (Lys417Asn, Leu452Arg, Thr478Lys), with a C-terminal 6-His tag
Purity	>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin level	<0.10 EU per 1 μg of the protein by the LAL method.
N-terminal sequence Analysis	Arg319
Predicted Molecular Mass	26 kDa
SDS-PAGE	30-37 kDa, under reducing conditions.
Activity	Measured by its binding ability in a functional ELISA with Recombinant Human ACE-2 His-tag (Catalog # 933-ZN).

Recombinant SARS-CoV-2 AY.1/AY.2 Spike RBD His Protein, CF Scientific Data Examples

	Recombinant SARS-CoV-2 AY.1/AY.2 Spike RBD His-tag Protein Binding Activity. Recombinant SARS-CoV-2 AY.1/AY.2 Spike RBD His-tag (Catalog # 10905-CV) binds Recombinant Human ACE-2 His-tag (Catalog # 933-ZN) in a functional ELISA.
	Recombinant SARS-CoV-2 AY.1/AY.2 Spike RBD His-tag Protein SDS-PAGE. 2 μg/lane of Recombinant Recombinant SARS-CoV-2 AY.1/AY.2 Spike RBD His-tag Protein (Catalog # 10905-CV) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 30-37 kDa.
	Binding of ACE-2 to SARS-CoV-2 AY.1/AY.2 variant Spike RBD protein by surface plasmon resonance (SPR). Recombinant SARS-CoV-2 AY.1/AY.2 variant Spike RBD protein His-tag (Catalog #10905-CV) was immobilized on a Biacore Sensor Chip CM5, and binding to recombinant human ACE-2 (933-ZN) was measured at a concentration range between 0.184 nM and 94.3 nM. The double-referenced sensorgram was fit to a 1:1 binding model to determine the binding kinetics and affinity, with an affinity constant of K_D=13.8 nM. (Biacore T200).

Formulation, Preparation and Storage

Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.

10905-CV

Formulation	Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose.
Reconstitution	Reconstitute at 500 μg/mL in PBS.
Shipping	The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage:	Use a manual defrost freezer and avoid repeated freeze-thaw cycles. 12 months from date of receipt, -20 to -70 °C as supplied. 1 month, 2 to 8 °C under sterile conditions after reconstitution. 3 months, -20 to -70 °C under sterile conditions after reconstitution.

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.

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Background: Spike RBD

SARS-CoV-2, which causes the global pandemic coronavirus disease 2019 (Covid-19), belongs to a family of viruses known as coronaviruses that also include MERS and SARS-CoV-1. Coronaviruses are commonly comprised of four structural proteins: Spike protein (S), Envelope protein (E), Membrane protein (M) and Nucleocapsid protein (N) (1). The SARS-CoV-2 S protein is a glycoprotein that mediates membrane fusion and viral entry. The S protein is homotrimeric, with each ~180-kDa monomer consisting of two subunits, S1 and S2 (2). In SARS-CoV-2, as with most coronaviruses, proteolytic cleavage of the S protein into S1 and S2 subunits is required for activation. The S1 subunit is focused on attachment of the protein to the host receptor while the S2 subunit is involved with cell fusion (3-5). A metallopeptidase, angiotensin-converting enzyme 2 (ACE2), has been identified as a functional receptor for SARS-CoV-2 through interaction with a receptor binding domain (RBD) located at the C-terminus of S1 subunit (6,7). The RBD of SARS-CoV-2 shares 73% amino acid (aa) identity with the RBD of the SARS-CoV-1, but only 22% aa identity with the RBD of MERS. SARS-CoV-2 delta plus (AY.1/AY.2 or B.1.617.2.1) variant carrying the aa substitution L417N, L452R, and T478K in the RBD was first identified in India and quickly spread to US through England and Japan. It is reported to partially escape neutralization of antibodies and vaccines (8).

Item	Value
References	Wu, F. et al. (2020) Nature 579:265. Tortorici, M.A. and D. Veesler (2019) Adv. Virus Res. 105:93. Bosch, B.J. et al. (2003) J. Virol. 77:8801. Belouzard, S. et al. (2009) Proc. Natl. Acad. Sci. 106:5871. Millet, J.K. and G.R. Whittaker (2015) Virus Res. 202:120. Li, W. et al. (2003) Nature 426:450. Wong, S.K. et al. (2004) J. Biol. Chem. 279:3197. Kannan, S.R. et al. (2021) J. Autoimmun. 124:https://doi.org/10.1016/j.jaut.2021.102715.
Long Name	Spike Receptor Binding Domain
Entrez Gene IDs	3200426 (HCoV-HKU1); 14254594 (MERS-CoV); 1489668 (SARS-CoV); 43740568 (SARS-CoV-2)
Alternate Names	Spike RBD

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