Rhodamine-Phalloidin/Calcofluor Staining

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  • Formaldehyde - Polysciences, 10% EM Grade Cat #04018
  • 10XPBS - 80 grams NaCl + 2 grams KCl + 14.4 grams Na2HPO4 + 2.4 grams KH2PO4. pH upon dilution to 1X should be 7.2.
  • Rhodamine Phalloidin - Molecular Probes Inc., Dissolved in methanol according to manufacturers instructions to ~6.6uM and stored dessicated at -20¡C. Cat#R-415.
  • Calcofluor - aka fluorescent brightener 28. Sigma Cat#F-6259. Dissolve to 1mg/ml in H2O overnight and store at 4¡C in the dark.
  • Mount - Dissolve 100 mg p-phenylenediamine in 10 mls PBS, adjust the pH to above 8.0 with 0.5 M Na Carbonate buffer (pH 9.0) and bring the volume to 100 mls with glycerol. Add Dapi to 50 ng/ml. Mix thoroughly and store at -20¡C. It turns brown when it is bad.


  1. Grow 50 mls of yeast to 5x10E6.
  2. Add formadehyde to the media to 4% (33 mls. of 10%). Fix in media at temperature for 10 min.
  3. Spin down cells 2-3 K for 5 min.
  4. Fix cells in PBS containing 4% formadehyde for 1 hr at temperature.
  5. Wash cells 2 times with PBS and reconstitute in 500ul PBS.
  6. Remove 100ul cells and add 10ul Rhodamine Phalloidin (6.6uM in MeOH) and add 10 ul 1 mg/ml Calcufluor. Incubate in the dark for 1 hr.
  7. Wash the cells 5 times in 1 ml PBS.
  8. Suspend the cells in 1 drop of immunofluorescence mounting solution and store at 4¡C (good for a few days).
  9. Visualize by placing 2 ul of cell suspension under a standard size coverslip and waiting for capilary action to draw the liquid out thus flattening the cells.

Adapted from: http://www.upstate.edu/biochem/amberg/protocols/rho_pha_calc.php