Anti-HA Nanobody Magnetic Beads – Catalog #B2025479

Anti-HA Nanobody Magnetic Beads (Catalog #B2025479) are laboratory tools for high-affinity isolation of HA-tagged recombinant proteins. The beads are coated with nanobodies—small (~15 kDa), camelid-derived antibody fragments—that recognize the HA epitope with picomolar to nanomolar affinity. Supplied as 0.1 mL in solution, they enable one-step, magnetic bead-based separation of HA fusion proteins from complex protein mixtures, providing superior specificity and binding kinetics compared to conventional monoclonal antibodies.

Scientific Overview

Nanobodies (variable domains of camelid heavy-chain antibodies) are emerging as powerful tools for protein affinity purification and detection. Compared to conventional monoclonal antibodies (~150 kDa), nanobodies are one-tenth the size (~15 kDa), more thermodynamically stable, often exhibit superior specificity, and are frequently found to bind their epitopes with picomolar to nanomolar affinity. These properties make nanobodies especially valuable for sensitive isolation of HA-tagged proteins and for studying transient or weak protein-protein interactions where minimal perturbation is required.

The HA epitope (YPYDVPDYA) from influenza hemagglutinin is a standard small tag in molecular biology. Anti-HA nanobodies recognize this epitope with extremely high affinity while minimizing non-specific interactions with other cellular or bacterial proteins. When immobilized on magnetic beads, anti-HA nanobodies provide rapid, one-step purification with the added benefits of nanobody-derived affinity and the convenience of magnetic separation.

Key applications include:

• Ultra-high-affinity isolation of HA-tagged proteins from complex lysates
• Co-immunoprecipitation of transient or weak protein-protein interaction partners
• Enrichment of HA-tagged proteins for mass spectrometry
• Structural biology workflows requiring minimal sample perturbation
• Purification of native protein complexes while preserving interactions

Usage & Handling Guidance

These beads are supplied as a suspension. Gently mix before each use; avoid vortexing. Add the beads directly to your lysate or protein mixture and incubate at 4°C for 15–30 minutes to allow binding (the high affinity of nanobodies often shortens incubation time compared to conventional antibodies). Place the tube in a magnetic rack for 1–2 minutes to pellet the beads, then remove the supernatant and wash 3–5 times with binding buffer or PBS.

• Binding buffer: PBS, TBS, or your native lysis buffer is suitable. Standard lysis buffers with protease inhibitors work well.
• Incubation: 15–30 minutes at 4°C. Shorter incubation times (compared to monoclonal antibody beads) are often sufficient because of the high affinity of nanobodies.
• Washing: Perform 3–5 washes with 10–15 bead volumes of binding buffer per wash. The high specificity of nanobodies typically results in lower background.
• Elution: Elute with low pH buffer (0.1 M glycine, pH 2.8–3.0) or denaturing conditions (6 M urea, 8 M guanidinium chloride).
• Magnetic separation: Use a commercial magnetic rack for 1.5 or 2 mL tubes.

What You Get

• 0.1 mL of anti-HA nanobody magnetic beads in solution
• Ready-to-use beads for rapid, high-affinity protein purification
• Picomolar-to-nanomolar affinity camelid nanobodies
• For research use only (RUO)

Why Researchers Choose It

• Nanobodies offer picomolar-to-nanomolar affinity and superior specificity
• Small size (~15 kDa) minimizes steric hindrance and preserves protein interactions
• Faster binding kinetics typically shorten purification protocols
• Excellent for isolating transient or weak protein complexes
• Compatible with downstream mass spectrometry and structural biology methods

Frequently Asked Questions (FAQ)

• What is the affinity of the anti-HA nanobody?
  Camelid-derived anti-HA nanobodies typically exhibit Kd values in the picomolar to low-nanomolar range. Request a COA/TDS for lot-specific affinity data.
• How do nanobodies compare to conventional monoclonal antibodies?
  Nanobodies are ~15 kDa versus ~150 kDa for full antibodies, often bind with higher affinity (picomolar to nanomolar), are more stable, and can access epitopes in protein cavities. However, some applications may benefit from the avidity effects of bivalent antibodies.
• Can I use shorter incubation times with nanobody beads?
  Yes. The high affinity and binding kinetics of nanobodies often allow efficient capture in 15–30 minutes, compared to 30–60 minutes for conventional antibody beads.
• Are these beads suitable for structural biology applications?
  Yes. The small size of nanobodies and their ability to preserve native protein-protein interactions make them well-suited for protein complex purification prior to electron microscopy or crystallography.
• How do I know if my HA-tagged protein is compatible?
  Any protein bearing an N-terminal, C-terminal, or internal HA epitope (YPYDVPDYA) should bind these nanobodies. The accessibility of the epitope in your particular fusion protein may vary; test with a small amount of lysate first.

References

• Götzke H, Kilisch M, Martínez-Carranza M, Sograte-Idrissi S, Rajavel A, Schlichthaerle T, Engels N, Jungmann R, Stenmark P, Opazo F, Frey S. The ALFA-tag is a highly versatile tool for nanobody-based bioscience applications. Nat Commun. 2019;10(1):4403.
• Fridy PC, Li Y, Keegan S, Thompson MK, Nudelman I, Scheid JF, Oeffinger M, Nussenzweig MC, Fenyö D, Chait BT, Rout MP. A robust pipeline for rapid production of versatile nanobody repertoires. Nat Methods. 2014;11(12):1253-60.
• Chen ZS, Huang HC, Wang X, Schön K, Jia Y, Lebens M, Besavilla DF, Murti JR, Ji Y, Sarshad AA, Deng G, Zhu Q, Angeletti D. Influenza A Virus H7 nanobody recognizes a conserved immunodominant epitope on hemagglutinin head and confers heterosubtypic protection. Nat Commun. 2025;16(1):432.