SARS-CoV-2 Pseudoviral Particles, Lambda Variant (C.37)

• Cat.No.: SARS-CoV-2-12PsV
• Product Overview: Our SARS-CoV-2-Lambda Pseudoviral Particles are replication-deficient MLV pseudotyped with the SARS-CoV-2 spike protein of the Lamdba variant, originally known as lineage C.37. They also contain the ORF for firefly luciferase as a reporter. They establish a pseudovirus cell entry assay mediated by the SARS-CoV-2 spike protein that can be conveniently measured via luciferase reporter activity. This pseudovirus assay isolates the SARS CoV-2 viral entry from other steps of the viral infection cycle.

Specification

• Species: SARS-CoV-2
• Description: It has been known that SARS coronavirus 2 (SARS-CoV-2) uses human ACE2 as entry receptor and human proteases as entry activators. The virus surface spike protein (S) mediates SARS-CoV-2 entry into cells. To fulfill its function, SARS CoV-2 spike binds to its human ACE2 (hACE2) receptor through its receptor-binding domain (RBD) and is proteolytically activated by human proteases.
• Usage: Note: requires a luciferase assay reagent.
  Cell Infection:
  1. Count HEK293-ACE2 cells to be infected and seed ~20K cells per well into 96-well plates (50 μL per well) DMEM with 10% Serum (no antibiotics) or 5K cells per well into 384-well plates (15 μL per well).
  2. Culture cells overnight to make sure the cells stably adhere to the plates.
  3. On the 2nd day, remove media, add 50 μL SARS-CoV-2-Lambda Pseudoviral Particles* into each well (12.5 μL for 384-well plate). Spin at 700 rpm for 15 min at 4 centigrade.
  *Note: thaw the pseudoviral particles quickly in the room temperature water (< 30 minutes, do not shake) and use right away. Discard the unused portion (do not re-freeze or leave it on ice for later use).
  4. Incubate for 2 hrs at 37 centigrade.
  5. Add 50 μL DMEM with 10% FC into each well (12.5 μL for 384-well plates).
  6. Incubate for 42 hrs at 37 centigrade.
  Measurement of Luciferase Activity in Infected Cells
  1. Do not remove medium. Add 100 μL luciferase assay WORKING SOLUTION (25 μL for 384-well plate) directly into each well.
  2. Read in a luminescence plate reader and record the data.
• Applications: Our Pseudovirus Particles generate robust chemiluminescent signals in cell assays when coupled with our firefly luciferase assay kit, useful for:
  1) screening potential inhibitor to block SARS-CoV-2 entry and viral protein translation;
  2) measuring the activity of and screening for neutralizing antibody against SARS-CoV-2-Lambda.
• Shelf Life: Six months from the date of shipping when stored at -70 centigrade.
• Features: Robust: Excellent signal to noise (basal) ratio
  Easy to use: Amenable to HTS format (96-well, 384-well and 1536-well format)
• Storage: At -70 centigrade.
• Shipping: Shipped on dry ice.
• References: 1. A novel linker-immunodominant site (LIS) vaccine targeting the SARS-CoV-2 spike protein protects against severe COVID-19 in Syrian hamsters. Emerging Microbes & Infections, May 2021.
  2. Immunogenicity and Neutralizing Activity Comparison of SARS-CoV-2 Spike Full-Length and Subunit Domain Proteins in Young Adult and Old-Aged Mice. Vaccines, Feb. 2021.
  3. Serum Antibody Profile of a Patient With Coronavirus Disease 2019 Reinfection. Clinical Infectious Diseases, Sept. 2020.