Recombinant SARS-CoV Spike (GCN4-IZ) His-tag Protein, CF

Catalog #: 10581-CV 2 Reviews Datasheet

CHO expressed. GCN4-IZ trimerization domain. Prefusion Conformation. High ACE-2 binding

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10581-CV-100

Recombinant SARS-CoV Spike (GCN4-IZ) His-tag Protein Binding Activity

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

Recombinant SARS-CoV Spike (GCN4-IZ) His-tag Protein, CF Summary

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 His-tag (Catalog # 933-ZN).

Source

Chinese Hamster Ovary cell line, CHO-derived sars-cov Spike protein

SARS-CoV Spike (Ser14-Lys1193) (K968P) (V969P) Accession # YP_009825051.1	GCN4-IZ	HHHHHH
N-terminus		C-terminus

Includes trimerization domain GCN4-IZ

Accession #

YP_009825051.1

N-terminal Sequence
Analysis

Ser14

Structure / Form

Non-covalent oligomer

Predicted Molecular Mass

136 kDa

SDS-PAGE

155-177 kDa, under reducing conditions

Product Datasheets

10581-CV

Product Datasheet

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.

10581-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.

Scientific Data

Binding Activity

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Recombinant SARS-CoV Spike (GCN4-IZ) His-tag (Catalog # 10581-CV) binds Recombinant Human ACE-2 His-tag (933-ZN) in a functional ELISA.

SDS-PAGE

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2 μg/lane of Recombinant SARS-CoV Spike (GCN4-IZ) His-tag Protein (Catalog # 10581-CV) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 155-177 kDa.

Background: Spike

SARS-CoV was discovered in association with cases of severe acute respiratory syndrome (SARS) that infected more than 8,000 persons with over 900 fatalities worldwide in 2002-2003 (1). It belongs to a family of viruses known as coronaviruses that also include MERS and SARS-CoV2 that causes the global pandemic coronavirus disease 2019 (Covid-19). Coronavirus is commonly comprised of four structural proteins: Spike protein(S), Envelope protein (E), Membrane protein (M) and Nucleocapsid protein (N) (1). SARS-CoV S Protein is a trimeric type-I membrane glycoprotein that mediates membrane fusion and viral entry. As with most coronaviruses, proteolytic cleavage of the S protein into two distinct peptides, 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 (2-4). A metallopeptidase, angiotensin-converting enzyme 2 (ACE-2), has been identified as a functional receptor for SARS-CoV through interaction with a receptor binding domain (RBD) located at the C-terminus of S1 subunit (5, 6). Based on amino acid (aa) sequence homology, the S protein of SARS-CoV shares 75% and 31% homology with S protein of SARS-CoV2 and MERS, respectively. Before binding to the ACE-2 receptor, structural analysis of the S1 trimer shows that only one of the three RBD domains in the trimeric structure is in the "up" conformation. This is an unstable and transient state that passes between trimeric subunits but is nevertheless an exposed state to be targeted for neutralizing antibody therapy (7). Antibodies to S protein especially the S1 subunit of SARS-CoV have been shown to inhibit interaction with the ACE-2 receptor, confirming S1 subunit as an attractive target for vaccinations or antiviral therapy (8).

References

Rota, P.A. et al. (2003) Science 300:1394.
Bosch, B.J. et al. (2003). J. Virol. 77:8801.
Belouzard, S. et al. (2009) Proc. Natl. Acad. Sci. USA 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.
Ortega, J.T. et al. (2020) EXCLI J. 19:410.
Du, L. el al. (2009) Nat. Rev. Microbiol. 7:226.

Long Name

Spike Protein

Entrez Gene IDs

918758 (HCoV-229E); 2943499 (HCoV-NL63); 39105218 (HCoV-OC43); 37616432 (MERS-CoV); 1489668 (SARS-CoV); 43740568 (SARS-CoV-2)

Alternate Names

2019-nCoV S Protein; 2019-nCoV Spike; COVID-19 Spike; E2; Human coronavirus spike glycoprotein; Peplomer protein; S glycoprotein; S Protein; SARS-COV-2 S protein; SARS-COV-2 Spike glycoprotein; SARSCOV2 Spike protein; SARS-CoV-2; Severe Acute Respiratory Syndrome Coronavirus 2 Spike Protein; Spike glycoprotein; Spike; surface glycoprotein