Team:Washington/Notebook/Flow Cytometry


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Flow Cytometry

  1. Set up overnights of parts J36848-J36851 in terrific broth (TB). Let grow overnight at 37°C.
  2. Dilute 20 μL overnight into 1 mL TB and grow at 37°C until OD 0.3 to OD 0.8.
  3. Add IPTG to 1 mM concentration and let grow for minimum of four hours at room temperature (~23°C).
  4. Record OD 600 and add equivalent of 1 μL of OD 2.0 cells to 1mL PBS with 1 mg/mL BSA and specified flourophore concentration (0-100 nM) and allow time to bind (30 minutes to 1 hour).
  5. Preincubate second set of samples in 1 μM biotin to test for nonspecific binding of the fluorophore to the cells
  6. Similarly incubate streptavidin-coated beads with fluorophore in PBS + BSA.
  7. Record cytometry data with 100 μL of each sample.
  8. Centrifuge samples, carefully pipette off supernatant to ~20 μL to avoid disturbing loose pellets, and resuspend samples in 1mL PBS + BSA
    • Spin beads at 1000 x g for 1 minute
      Spin cells at 17,000 x g for 1 minute
  9. Record cytometry data again with reduced fluorescence background

Flow Protocol References

  1. Isolating and engineering human antibodies using yeast surface display. Chao G et al. Nat Protoc. 2006;1(2):755-68
  2. Cell division in Escherichia coli cultures monitored at single cell resolution. Roostalu J et al. BMC Microbiology 2008, 8:68; doi:10.1186/1471-2180-8-68