Acti-stain 488 phalloidin

Acti-stain 488 phalloidin
$0.00

Product Uses Include

  • Fluorescent staining of actin filaments in fixed tissue sections and tissue culture cells preparations.  Note: Unlike many actin antibodies, Acti-stain™ 488 phalloidin binds only to F-actin resulting in low background fluorescence.  Furthermore, binding of F-actin by Acti-stain is not appreciably different between species.
  • Preparation of stabilized fluorescent actin filaments in vitro.

 

Actin staining is very useful in determining the structure and function of the cytoskeleton in living and fixed cells. The actin cytoskeleton is a very dynamic and labile structure in the living cell, but it can be fixed with paraformaldehyde prior to probing or staining for actin structures. 

 

Material

Phalloidin is a seven amino acid peptide toxin from the mushroom Amanita phalloides, which binds specifically and with high affinity (Kd 20 nM) to the polymerized form of actin (F-actin).  Phalloidin lowers the critical concentration of actin polymerization to less than 1 µg/ml, thereby acting as a polymerization enhancer. Phalloidin has been labeled with a proprietary green fluorescent dye which allows it to be used to stain actin filaments in tissue cultured cells and tissue sections (1, see Figure 1) and cell-free preparations.  Acti-stain™ 488 phalloidin-labeled actin filaments retain many functional characteristics of unlabeled actin including their ability to interact with myosin.  Actin-stain™ 488 phalloidin is supplied as an orange solid. 

Note: Phalloidin is toxic and must be handled with care (LD50 human = 2mg/Kg).


 

Example Results and Specifications

Figure 1.   Actin Stress Fibers stained with Acti-stain™ 488 in a Swiss 3T3 cell.

PHDG1_img1

Swiss 3T3 cell stained with anti-vinculin (red), Dapi (blue nucleus) and F-actin is stained with Acti-stain™ 488 (green F-actin, Cat.# PHDG1).

Figure 2. Emission and excitation scans for Acti-stain™ phalloidins

PHDG1_scan

Absorbance and fluorescence scan of Acti-stain™ 488. Labeled phalloidin was diluted into methanol and its absorbance and excitation spectra were scanned between 350-750 and 500-750 nm, respectively. Absorbance peaks at 500 nm and fluorescence at 550 nm.

Acti-stain phalloidins are the most well characterized phalloidins available. Tabe 1 describes their brightness, photostability, background and affinity constants to F-actin. Compare these performance characteristics to other fluorescent phalloidins and you will see the advantages of using Acti-stain™ for your actin staining requirements.

Table 1. Biochemical characteristics of fluorescent phalloidins

ConjugateCat.#

Wavelengths (Ex/Em)

Brightness (AFU*)

Stability to photobleaching(half life in seconds**)

Background (% of total AFU at 100nM**)

Affinity (Kd in nanomolar)

Fluorescein-phalloidin

na485/535 FITC filter set43262272 +/-12

Acti-stain™ 488

PHDG1485/535 FITC filter set83257555 +/-8

Acti-stain™ 535

PHDR1535/585 TRITC filter set430271236 +/-7

Acti-stain™ 555

PHDH1535/585 TRITC filter set551461663 +/-8

Acti-stain™ 670

PHDN1640/680 Cy5 filter set33281850 +/-12

* = AFU's measured by quantitative cell imaging. ** = Measured in stained Swiss 3T3 cells in the absence of antifade.

 

For more information about protocols to fix and stain cells click here.

 

References

1. Wulf, E. et al. (1979). Proc Natl Acad Sci USA. 76(9):4498-4502.

2. Kron, S.J. et al. (1991).  Meth. Enzmol. 196: 399-416.

For product Datasheets and MSDSs please click on the PDF links below.   For additional information, click on the FAQs tab above or contact our Technical Support department at tservice@cytoskeleton.com

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Question 1:  Can I use fluorescently-labeled phalloidin to stain F-actin in living cells?

Answer 1:  Unfortunately, no, phalloidin cannot be used to stain F-actin in living cells.  Phalloidins are used to stain F-actin in fixed cells.  Fluorescent phalloidins only bind to the native quaternary structure of F-actin which provides a low background.  The correct fixation condition for phalloidin binding is 3.7% (v/v) paraformaldehyde in PBS for 10 min because it retains the quaternary protein structure which is necessary for high affinity binding of phalloidin.  Methanol fixation destroys the native conformation and hence is not suitable for F-actin staining with phalloidin.  To monitor actin dynamics in living cells, micro-injection of rhodamine-labeled actin (Cat. # APHR or AR05) is recommended.  Please see those datasheets for more information.

 

Question 2:   Which of the fluorescently-labeled phalloidin is the most stable/brightest?

Answer 2:  The brightest and most stable of the Acti-stains is Acti-stain 488 (green fluorescence; Cat. # PHDG1).  Please see the table below for additional information on all of our Acti-stains. 

Conjugate

Cat. #

Wavelengths (Ex/EM)

Brightness (AFU)

Stability to photobleaching* (1/2 life in sec)

Background (% of total AFU at 100 nM)

Acti-stain™ 488

PHDG1

485/535

832

57

5

Acti-stain™ 535

PHDR1

535/585

430

27

12

Acti-stain™ 555

PHDH1

535/585

551

46

16

Acti-stain™ 670

PHDN1

640/680

332

8

18

* = measured in the absence of antifade.

 

 If you have any questions concerning this product, please contact our Technical Service department at tservice@cytoskeleton.com.