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Magnetic Cell Isolation with Streptamer®

Streptamer®: fully reversible reagents for the selection of uncompromised, authentic cells

In order to study cell-cell interactions, it is essential to gain unmanipulated cells from cell isolation. The Streptamer® technology covers different stages in cell research from cell isolation to cell expansion and cell staining. With this method the cells preserve authentic properties, full effector function as well as viability and serial positive selections of even rare cell subsets is possible. By adding low concentrations of biotin, the isolation reagents dissociate rapidly from the cell surface, leaving authentic cells ready for further experiments.

Choose your field of interest

Streptamer® - Key features

  • No stimulation of cells after cell separation
  • Optimal preservation of cell effector function
  • Improved viability of cells
  • High reproducibility

Streptamer® - Principle

Example of T cell isolation with magnetic Fab Streptamers®:

Magnetic Fab Streptamers® Magnetic MHC I Streptamers®
for (serial) positive selection(s) of T cells from PBMCs with magnetic microbeads and a hand-held magnet (StrepMan Magnet)
for selection of antigen-specific CD8+ T cells from PBMCs with magnetic microbeads and a hand-held magnet (StrepMan Magnet)

Full reversibility in detail

Low affinity Strep-tagged Fab fragments or MHC molecules are employed to convey the specificity to the target cell population. In order to achieve a high binding affinity for proper cell isolation, the Strep-tag® fragments bind to a multimerized Strep-Tactin®, a streptavidin derivative. Due to this a high binding avidity of the fragment is achieved. Upon addition of low concentrations of biotin, isolation reagents dissociate rapidly from the cell surface. This reversibility enables sequential positive cell selections with magnetic beads.

A modular system for cell selection AND staining

Fab-Streps or MHC-Streps can be combined with bead-labeled Strep-Tactin® for magnetic isolation. Biotin is offered as stock solution with the Streptamer® Solution Set which is used for removing the cell isolation reagents. This modular system enables the combination of multiple receptor- or antigen-specific staining and isolation products, making your experiments more convenient and economic. All reagents can be purchased as single products or assembled in ready-to-use staining or isolation kits.