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Annexin V (or Annexin A5) is a member of the annexin family of intracellular proteins that binds to phosphatidylserine (PS) in a calcium-dependent manner. PS is normally only found on the intracellular leaflet of the plasma membrane in healthy cells, but during early apoptosis, membrane asymmetry is lost and PS translocates to the external leaflet. Fluorochrome-labeled Annexin V can then be used to specifically target and identify apoptotic cells. Annexin V Binding Buffer (Cat. No. 422201) is recommended for use with Annexin V staining. Annexin V binding alone cannot differentiate between apoptotic cells and necrotic. Therefore, we recommend using our Helix NP™ Blue (Cat. No. 425305), Helix NP™ Green (Cat. No. 425303) or Helix NP™ NIR (Cat. No. 425301). Early apoptotic cells will exclude 7-AAD and PI, while late stage apoptotic cells and necrotic cells will stain positively, due to the passage of these dyes into the nucleus where they bind to DNA.Product Details
- All mammalian species
- Phosphate-buffered solution, pH 7.2, containing 0.09% sodium azide and BSA (origin USA).
- The protein was purified by affinity chromatography and conjugated with Brilliant Violet 421™ under optimal conditions.
- Lot-specific (please contact technical support for concentration and total µg amount, or use our Lookup tool if you have a lot number.)
- Storage & Handling
- The solution should be stored undiluted between 2°C and 8°C, and protected from prolonged exposure to light. Do not freeze.
FC - Quality tested
- Recommended Usage
Each lot of this product is quality control tested by immunofluorescent staining with flow cytometric analysis. For flow cytometric staining, the suggested use of this reagent is 5 µl per 100,000 - million cells in a 100 µl volume of Annexin V Binding Buffer (Cat No. 422201). It is recommended that the reagent be titrated for optimal performance for each application.
Brilliant Violet 421™ excites at 405 nm and emits at 421 nm. The standard bandpass filter 450/50 nm is recommended for detection. Brilliant Violet 421™ is a trademark of Sirigen Group Ltd.
Learn more about Brilliant Violet™.
This product is subject to proprietary rights of Sirigen Inc. and is made and sold under license from Sirigen Inc. The purchase of this product conveys to the buyer a non-transferable right to use the purchased product for research purposes only. This product may not be resold or incorporated in any manner into another product for resale. Any use for therapeutics or diagnostics is strictly prohibited. This product is covered by U.S. Patent(s), pending patent applications and foreign equivalents.
- Excitation Laser
Violet Laser (405 nm)
- Application Notes
Annexin V Staining
1. Wash cells twice with cold BioLegend Cell Staining Buffer (Cat. No. 420201) and then resuspend cells in Annexin V Binding Buffer (Cat. No. 422201) at a concentration of 1x106 cells/mL
2. Transfer 100 µL of cell suspension in 5 mL test tube.
3. Add 5 µL of Brilliant Violet™ 421 Annexin V.
4. Add 10 µL of PI solution (Cat. No. 421301) or 7-AAD (Cat. No. 420403/420404).
5. Gently vortex the cells, and incubate for 15 min at room temperature (25°C), in the dark.
6. Add 400 µL of Annexin V Binding Buffer (Cat. No. 422201) to each tube. Analyze by flow cytometry.
For a better experience detecting apoptosis, we now recommend Apotracker™. Cell staining with Apotracker™ is Calcium independent. Thus, no special buffers are required, and the protocol can be shortened for single-step co-staining with other reagents.
- Additional Product Notes
View more applications data for this product in our Scientific Poster Library.
- Application References
- Product Citations
not an antibody (BioLegend Cat. No. 640923)
not an antibody (BioLegend Cat. No. 640924)
- Can I freeze Annexin V conjugates?
It should not be frozen as it will lead to loss of biological activity due to dimerization.
- Can I use RPMI during Annexin V staining?
It is best to follow protocol as described on the product data sheet. Moreover, RPMI 1640 has a relatively high concentration of phosphate and low calcium ion concentration, which negatively impacts Annexin binding to its target phosphatidylserine (PS). Measurement of cell death by using Annexin V may also be significantly affected by time of incubation on ice, calcium concentration, and type of medium.
- How does pH and staining temperature affect Annexin V-Phosphatidylserine binding?
Annexin-Phosphatidylserine binding is lost below pH 5.2 and with prolonged incubation over a temperature of 42°C.
- How is your Annexin made and what sequence does it cover?
It is made in E. coli, covering human aa Met1-Asp320.
- Is Annexin V suitable for conjugation with the Maxpar® kit for CyTOF®?
Maxpar® Labeling kits require the protein to be partially reduced, so the metal chelate can be introduced through an SH group in the hinge region of the reduced antibody. Human Annexin V contains only one Cysteine which was reported to be chemically inactive. Thus, the Maxpar® labeling protocol would not work with Annexin V, unless a free –SH group can be introduced to Annexin V. For more information regarding SH-mediated conjugation of Annexin V please consult published papers such as this one.
- What is the F/P ratio range of our BV421™ format antibody reagents?
It is lot-specific. On average it ranges between 2-4.
- Why do I need to use Annexin V Binding Buffer?
Annexin V binding requires the presence of calcium in the solution. So, we provide Annexin V Binding Buffer (cat # 422201), which is optimized for the best performance of Annexin V staining.
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