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Background: 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 B.1.429 variant (also known as CAL.20C) was identified in California in the spring of 2021 and contains a number of mutations. This variant may spread more easily and quickly than other variants.
Description: The Spike (B.1.429 Variant) (SARS-CoV-2) Pseudotyped Lentiviruses were produced with SARS-CoV-2 B.1.429 Variant Spike (Genbank Accession #QHD43416.1 with B.1.429 variant mutations; see below for details) as the envelope glycoproteins instead of the commonly used VSV-G. These pseudovirions contain the firefly luciferase gene driven by a CMV promoter, therefore, the spike-mediated cell entry can be measured via luciferase activity. The Spike (B.1.429 Variant) (SARS-CoV-2) pseudotyped lentivirus can be used to measure the activity of neutralizing antibody against SARS-CoV-2 B.1.429 variant in a Biosafety Level 2 facility.Spike Mutations in B.1.429 Variant: S13I
W152C
L452R
D614G
Formulation: The lentiviruses were produced from HEK293T cells. Supplied in medium containing 90% DMEM + 10% FBS.Media Formulation
Thaw Medium 1 (BPS Bioscience #60187):
MEM medium supplemented with 10% FBS (Thermo Fisher #26140079), 1% non-essential amino acids, 1 mM Na pyruvate, 1% Penicillin/Streptomycin.
Storage Stability: Lentiviruses are shipped with dry ice. For long term storage, it is recommended to store the virus at -80°C.
Supplied As: The titer will vary with each lot; the exact value is provided with each shipment. Labeled as CAL.20C.
Warnings: Avoid repeated freeze/thaw cycles. Titers can drop significantly with each freeze/thaw cycle.Biosafety: None of the HIV genes (gag, pol, rev) will be expressed in the transduced cells, as they are expressed from packaging plasmids lacking the packing signal. Although the pseudotyped lentiviruses are replication-incompetent, they require the use of a Biosafety Level 2 facility. BPS recommends following all local federal, state, and institutional regulations and using all appropriate safety precautions.
Biosafety Level: BSL-2
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