Recombinant SARS-CoV-2 B.1.617.1 RBD His Avi-tag Protein, CF

Catalog #: AVI10846 Datasheet / COA / SDS

Kappa Variant L452R E484Q

Catalog #	Availability	Size / Price	Qty
AVI10846-050

Biotinylated Recombinant SARS-CoV-2 B.1.617.1 Spike RBD His-tag Avi-tag Protein Binding Activity.

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Summary Product Datasheets Carrier Free Data Images Reconstitution Calculator Background Related Research Areas

Recombinant SARS-CoV-2 B.1.617.1 RBD His Avi-tag Protein, CF Summary

Learn more about Avi-tag Biotinylated Proteins

Product Specifications

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.

Activity

Measured by its binding ability in a functional ELISA with Recombinant Human ACE-2 Fc Chimera (Catalog # 10544-ZN).

Source

Human embryonic kidney cell, HEK293-derived sars-cov-2 Spike RBD protein

SARS-CoV-2 B.1.617.1 Spike RBD (Arg319-Phe541) (Leu452Arg, Glu484Gln) Accession # YP_009724390.1	6-His tag	Avi-tag
N-terminus		C-terminus

Accession #

YP_009724390.1

N-terminal Sequence
Analysis

Arg319

Structure / Form

Biotinylated via Avi-tag

Predicted Molecular Mass

26 kDa

SDS-PAGE

35-40 kDa, under reducing conditions.

Product Datasheets

AVI10846

Product Datasheet

COA

SDS

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.

AVI10846

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.

Scientific Data

Binding Activity

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Biotinylated Recombinant SARS-CoV-2 B.1.617.1 Spike RBD His-tag Avi-tag (Catalog # AVI10846) binds Recombinant Human ACE-2 Fc Chimera (Catalog # 10544-ZN) in a functional ELISA.

SDS-PAGE

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2 μg/lane of Biotinylated Recombinant SARS-CoV-2 B.1.617.1 Spike RBD His-tag Avi-tag Protein (Catalog # AVI10846) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 31-38 kDa.

Reconstitution Calculator

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 (ACE-2), 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. A SARS-CoV-2 variant (B.1.617.1) carrying the aa substitution L452R and E484Q in the RBD was identified as a prevalent strain in India (8, 9). Whether these mutations in RBD would cause more severe symptom or decrease the efficacy of vaccine-induced immunity is still under investigation. Our Avi-tag Biotinylated SARS-CoV-2 B.1.617.1 Spike RBD features biotinylation at a single site contained within the Avi-tag, a unique 15 amino acid peptide. Protein orientation will be uniform when bound to streptavidin-coated surface due to the precise control of bionylation and the rest of the protein is unchanged so there is no interference in the protein bioactivity.

References