Spike (BA.1.1, Omicron Variant R346K) (SARS-CoV-2) Pseudotyped Lentivirus (eGFP Reporter)
The pandemic coronavirus disease 2019 (COVID-19) is caused by Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). As the first step of the viral replication, the virus attaches to the host cell surface before entering the cell. The viral Spike protein recognizes and attaches to the Angiotensin-Converting Enzyme 2 (ACE2) receptor found on the surface of type I and II pneumocytes, endothelial cells, and ciliated bronchial epithelial cells. Drugs targeting the interaction between the Spike protein of SARS-CoV-2 and ACE2 may offer protection against the viral infection. The Omicron Variant was identified in South Africa in November of 2021. This variant has a large number of mutations that allow the virus to spread more easily and quickly than other variants. As of February 2022, Omicron variants have been divided into four distinct sub-lineages: BA.1 (B.1.1.529), BA.1.1, BA.2, and BA.3. Compared with BA.1 (B.1.1.529), BA.1.1 has an additional R346K substitution in the spike protein.
The Spike (BA.1.1, Omicron Variant R346K) (SARS-CoV-2) Pseudotyped Lentiviruses were produced with SARS-CoV-2 BA.1.1 Variant Spike (Genbank Accession #QHD43416.1 containing all the BA.1.1 mutations; see below for details) as the envelope glycoproteins instead of the commonly used VSV-G. These pseudovirions contain the eGFP gene driven by a CMV promoter (Figure 1), therefore, the spike-mediated cell entry can be determined via eGFP fluorescence. The Spike (BA.1.1, Omicron Variant R346K) (SARS-CoV-2) pseudotyped lentivirus can be used to measure the activity of neutralizing antibody against SARS-CoV-2 BA.1.1 variant in a Biosafety Level 2 facility.
As shown in Figures 2, the Spike Omicron pseudovirus has been validated for use with target cells ACE2-HEK293 (which overexpress ACE2; BPS Bioscience #79951).
Spike Mutations in BA.1.1 Omicron Variant R346K:
A67V, Δ69-70, T95I, G142D, Δ143-145, Δ211, L212I, ins214EPE, G339D, R346K, S371L, S373P, S375F, K417N, N440K, G446S, S477N, T478K, E484A, Q493R, G496S, Q498R, N501Y, Y505H, T547K, D614G, H655Y, N679K, P681H, N764K, D796Y, N856K, Q954H, N969K, L981F
| Name | Ordering Information |
| Thaw Medium 1 | BPS Bioscience #60187 |
| ACE2- HEK293 Recombinant Cell Line | BPS Bioscience #79951 |
| 96-well white clear-bottom assay plate | Corning #3610 |
The lentiviruses were produced from HEK293T cells. Supplied in medium containing 90% DMEM + 10% FBS.
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