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AAT Bioquest

Buccutite™ Peroxidase (HRP) Antibody Conjugation Kit *Optimized for Labeling 1 mg Protein*

Protein-protein conjugations are commonly performed with a bifunctional linker (such as the commonly used SMCC), having different reactivity on each end for linking two different proteins. One end of the crosslinker reacts (via NHS ester) with amines (-NH2) found in the amino acid lysine and N-terminus, and the other end reacts (via maleimide) with the thiol groups (-SH) found in the amino acid cysteine. However, SMCC-modified protein is extremely unstable and often self-reactive since proteins often contain both amine and thiol groups that cause significant amount of homo-crosslinking. In addition it is quite difficult and tedious to quantify the number of maleimide groups on a protein. Buccutite™ Peroxidase (HRP) Antibody Conjugation Kit is designed for preparing horseradish peroxidase (HRP) conjugates directly from proteins, peptides, and other ligands that contain a free amino group. The HRP provided in our kit has been pre-activated with our proprietary linker Buccutite™ FOL, and can be directly used for conjugation. The entire process only requires two simple mixings without further purification required. The Buccutite™ FOL-activated HRP readily reacts with Buccutite™ MTA-containing molecules under extremely mild neutral conditions without any catalyst required. Compared to commonly used SMCC and other similar technologies, our Buccutite™ bioconjugation system is much more robust and easier to use. It enables faster and quantitative conjugation of biomolecules with higher efficiencies and yields.

Example protocol

AT A GLANCE

Protocol Summary
  1. Add 10 µL Reaction Buffer (Component C) into antibody solution (200 µL) if antibody concentration is 5 mg/mL in PBS

  2. Add 10 µL DMSO to Buccutite™ MTA vial (Component B) to make Buccutite™ MTA working solution

  3. Add 4.5 µL Buccutite™ MTA stock solution into the antibody solution

  4. Incubate at room temperature for 30 minutes
  5. Add 500 µL H2O to reconstitute Buccutite™ FOL-Activated HRP (Component A)

  6. Mix the Buccutite™ MTA activated antibody solution with 500 µL Buccutite™ FOL-Activated HRP (Component A)

  7. Incubate at room temperature for 60 minutes

Important Note

Upon receiving the kit, it should be stored at a temperature of 4°C. When stored properly, the kit should remain stable for up to six months. If required, Components A and B can be stored at a temperature of -20°C, but it is important to avoid freezing Component C (Reaction Buffer). Before opening the vials, all components should be warmed and briefly centrifuged. Then, the required solutions should be immediately prepared before starting the conjugation process. The following is an example SOP for labeling goat anti-mouse IgG antibody.

PREPARATION OF STOCK SOLUTIONS

Unless otherwise noted, all unused stock solutions should be divided into single-use aliquots and stored at -20 °C after preparation. Avoid repeated freeze-thaw cycles

Buccutite™ MTA Stock Solution
  1. Add 10 µL of DMSO into the vial of Buccutite™ MTA (Component B).

    Note: This stock solution should be used promptly.

PREPARATION OF WORKING SOLUTION

Antibody Working Solution
  1. To label 1 mg of antibody (assuming the target antibody concentration is 5 mg/mL), mix 10 µL of the Reaction Buffer (Component C) with 200 µL of the target antibody solution. If your antibody is not 5 mg/mL, please add 5% of the total volume of the Reaction Buffer (Component C).

    Note: The protocol assumes the target antibody concentration is 5 mg/mL. The antibody –Buccutite™ MTA reaction efficiency is significantly reduced if the antibody concentration is less than 1 mg/mL. For optimal labeling efficiency, the antibody concentration range of 1-5 mg/mL is recommended.

    Note: The antibody should be dissolved in 1X phosphate-buffered saline (PBS), pH 7.2-7.4. If the antibody is dissolved in glycine buffer, it must be dialyzed against 1X PBS, pH 7.2-7.4, or use ReadiUse™ 10KD Spin Filter (Cat. # 60502 from AAT Bioquest) to remove free amines or ammonium salts (such as ammonium sulfate and ammonium acetate) that are widely used for antibody precipitation. 

    Note: Impure antibodies or antibodies stabilized with bovine serum albumin (BSA) or gelatin will not be labeled well.

SAMPLE EXPERIMENTAL PROTOCOL

Run Antibody-Buccutite™ MTA Reaction
  1. Add 4.5 µL Buccutite ™ MTA stock solution to antibody working solution, and mix them well by repeatedly pipetting for a few times or vortex the vial for a few seconds.

  2. Keep the antibody- Buccutite ™ MTA reaction mixture at room temperature for 30 - 60 minutes.

    Note: The antibody-Buccutite™ MTA reaction mixture can be rotated or shaken for a longer time if desired.

Make HRP-antibody conjugation
  1. Make HRP- Buccutite™ FOL solution by adding 500 µL ddH2O into the vial of Buccutite™ FOL-Activated HRP (Component A), mix well by repeatedly pipetting for a few times or vortex the vial for a few seconds.

  2. Mix whole vial of Buccutite™ FOL-Activated HRP solution into the antibody- Buccutite™ MTA solution, mix well and rotating the mixture for 1 hour at room temperature.

  3. The HRP-antibody conjugate is now ready to use. Optional: HRP-antibody conjugate can be further purified through size exclusion chromatography to get better performance.

    Note: Alternatively, add antibody-Buccutite™ MTA solution mixture to the vial of Buccutite™ FOL-Activated HRP directly.

Storage of HRP-Antibody Conjugate

The antibody conjugate should be stored at > 0.5 mg/mL in the presence of a carrier protein (e.g., 0.1% bovine serum albumin). The HRP-Antibody conjugate solution could be stored at 4 °C for two months and kept from light. For longer storage, the HRP-antibody conjugates could be lyophilized and stored at ≤ –20 °C.

References

View all 9 references: Citation Explorer
Comparative activity of peroxidase-antibody conjugates with periodate and glutaraldehyde coupling according to an enzyme immunoassay
Authors: Tresca JP, Ricoux R, Pontet M, Engler R.
Journal: Ann Biol Clin (Paris) (1995): 227
Influence of the antibody-peroxidase coupling methods on the conjugate stability and on the methodologies for the preservation of the activity in time
Authors: Presentini R, Terrana B.
Journal: J Immunoassay (1995): 309
Peroxidase labelled monoclonal antibody against light chains of human cardiac myosin
Authors: Strakova Z, Barancik M, Lukacova D, Angyal R, Slosarcikova L, Horakova K.
Journal: Gen Physiol Biophys (1991): 63
Highly efficient and simple methods for the preparation of peroxidase and active peroxidase-antibody conjugates for enzyme immunoassays
Authors: Tijssen P, Kurstak E.
Journal: Anal Biochem (1984): 451
Direct immunocytochemistry with a horseradish peroxidase-conjugated monoclonal antibody against substance P
Authors: Boorsma DM, Cuello AC, van Leeuwen FW.
Journal: J Histochem Cytochem (1982): 1211
Page updated on November 12, 2024

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Catalog Number
55045506
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Storage, safety and handling

H-phraseH303, H313, H333
Hazard symbolXN
Intended useResearch Use Only (RUO)
R-phraseR20, R21, R22
UNSPSC12352200

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