Anti-DYKDDDDK Magnetic Beads – Catalog #B2026668

Anti-DYKDDDDK magnetic beads (Catalog #B2026668) are superparamagnetic particles (~10–100 nm iron oxide core) coated with monoclonal antibodies against the DYKDDDDK (FLAG) epitope. Supplied as 2 mL of suspension, they enable single-step affinity capture and purification of FLAG-tagged proteins from complex mixtures such as cell lysates, culture supernatants, or crude protein preparations. The magnetic properties allow rapid bead recovery using a simple magnet, eliminating the need for centrifugation and reducing sample loss.

Scientific Overview

The DYKDDDDK epitope (also called the FLAG tag) is a short octapeptide sequence widely used as a protein-affinity handle in molecular and cell biology. It is recognized with high affinity by specific monoclonal antibodies (such as M1 and M2 variants) and enables rapid one-step affinity purification of recombinant proteins. Immobilization of anti-FLAG antibodies onto magnetic particles combines the selectivity of antibody recognition with the convenience of magnetic separation, eliminating tedious centrifugation steps and improving recovery of labile proteins.

Superparamagnetic beads containing iron oxide cores become magnetized only in the presence of an external magnetic field, making them ideal for rapid and reversible capture and release of protein–bead complexes. This property enables fast washing steps (seconds to minutes) and reduces non-specific interactions caused by prolonged incubation on a solid support.

Key applications include:

• One-step isolation of FLAG-tagged proteins from cell lysates
• Co-immunoprecipitation of protein complexes
• Rapid purification of recombinant proteins in expression systems
• Sample enrichment before mass spectrometry or other downstream analysis
• High-throughput screening and bioassay workflows

Usage & Handling Guidance

Store at −20°C. Thaw at room temperature and mix gently before use. For optimal binding, use appropriate lysis or binding buffers (typically PBS, Tris-HCl, or HEPES, pH 7.0–8.0). Incubate beads with sample at 4°C for 30 minutes to 2 hours (or at room temperature for 15–30 minutes) with gentle mixing. Use an external magnet to immobilize beads and carefully remove the supernatant, then wash beads thoroughly in binding buffer (typically 2–3 washes). Elute bound proteins with glycine–HCl (pH 2.8) or acidic buffer, followed by immediate neutralization.

• Bead concentration: Use 10–50 µL of bead suspension per mL of sample, depending on target protein abundance and desired purification stringency.
• Incubation time: Longer incubation (1–2 hours) improves capture efficiency; shorter incubation (15 min) reduces non-specific binding.
• Wash stringency: Add detergent (0.1% Triton X-100 or Tween-20) to wash buffers if non-specific co-precipitation is observed.
• Elution: Acidic elution (glycine–HCl, pH 2.8) recovers proteins while maintaining antibody–bead binding; proteins must be neutralized immediately after elution to avoid denaturation.

What You Get

• 2 mL of anti-DYKDDDDK magnetic bead suspension
• Ready-to-use immunoprecipitation reagent for FLAG-tagged protein capture
• Convenient magnetic separation for rapid bead isolation
• For research use only (RUO)

Why Researchers Choose It

• Highly specific monoclonal antibody against the DYKDDDDK epitope
• Magnetic separation eliminates centrifugation and reduces sample loss
• Fast workflow (30 min to 2 hours total time)
• Compatible with downstream proteomics, structural biology, and cell biology applications
• Well-established protocols and wide use in research and diagnostic labs

Frequently Asked Questions (FAQ)

• What is the DYKDDDDK epitope?
  DYKDDDDK is an 8-amino-acid peptide sequence (also called the FLAG tag) recognized with high affinity by specific monoclonal antibodies. It is widely used in molecular biology to tag and purify recombinant proteins.
• How much sample can these beads handle?
  Binding capacity is approximately 50 kDa per mL of settled beads. For larger quantities, use proportionally more beads or contact us for bulk options.
• Can I use these beads for Western blotting?
  Yes. After immunoprecipitation, wash the beads and either boil them directly in SDS-PAGE sample buffer or elute the protein first, then proceed with standard Western blot protocols.
• What buffer should I use?
  Any pH 7.0–8.0 buffer suitable for your application works well (PBS, Tris-HCl, HEPES). Avoid buffers containing azide, which can reduce bead performance.
• Can I reuse these beads?
  Not recommended. While beads can be regenerated with acidic elution followed by washing, we recommend fresh beads for each purification to ensure consistent results and avoid cross-contamination between samples.

References

• Beugelink JW, Sweep E, Janssen BJC, Snijder J, Pronker MF. Structural Basis for Recognition of the FLAG-tag by Anti-FLAG M2. J Mol Biol. 2024;436(16):168649.
• Vélez-Bermúdez IC, Salazar-Henao JE, Riera M, Caparros-Ruiz D, Schmidt W. Protein and antibody purification followed by immunoprecipitation of MYB and GATA zinc finger-type maize proteins with magnetic beads. STAR Protoc. 2022;3(2):101449.
• Schotte L, Rombaut B, Thys B. A liquid phase affinity capture assay using magnetic beads to study protein-protein interaction: the poliovirus-nanobody example. J Vis Exp. 2012;(63).