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The novel Fab-TACS® technology for Cell Selection

Fab-TACS® technology perfectly combines the benefits of positive and negative cell selection and therefore allows the purification of:

  • Highly viable cells
  • Highly pure cells directly from whole blood
  • Label-free cells due to low affinity Fabs

Automated and Manual Cell Selection based on the Fab-TACS® technology

Manual Cell Selection Automated Cell Selection

The Fab-TACS® Gravity column is a chromatography column filled with a Strep-Tactin® coated matrix made of cell-grade agarose. It allows an easy and specific selection of target cells in high yields and purity directly from whole blood, buffy coat, mouse spleen or other single-cell tissue suspensions. 

The FABian® cell selection device is a fully automatic bench top instrument which automates the entire selection procedure based on IBA's novel Fab-TACS® technology. The cells of interest can be isolated in high yields, high viability and purity from diverse sources such as whole blood, buffy coat, mouse spleen cells or other single-cell suspensions.

Fab-TACS® technology for Fab-based Traceless Affinity Cell Selection

A standard problem in cell preparations is limited purity and recovery, which causes variability in quality and potency of cell products. Highly pure populations can be obtained best using positive selection techniques. However, the latter are often based on high affinity antibodies whose usage causes unfavorable effects like strong and almost irreversible binding to cells, cell stimulation as well as receptor blockade. IBA’s Strep-tag®/Strep-Tactin® system is the platform for the novel traceless affinity cell selection (Fab-TACS®) of cells. Thereby, Fab-TACS positive selection completely resigns the use of high affinity antibodies and ferromagnetic beads. In contrast, Fab-TACS® uses an immune-affinity chromatography based on Strep-tagged Fab-fragments (Fab-Streps) for reversible capture and release of target cells.

In more detail, a Strep-Tactin® coated matrix made of cell-grade agarose specifically binds low affinity Fab fragments. However, when multimerized on IBA’s unique agarose the Fab-Streps bind target cells with high avidity. Hence, if a single-cell suspension passes through the agarose matrix target cells adhere to the matrix based on the exclusive binding of the Fab-Strep to the target cell. Non-target cells are efficiently washed away. In a final step, the addition of biotin causes the elution of the target cells and the Fab-Streps spontaneously self-dissociate from the cell surfaces due to their reduced affinity.
Thus, the innovative Fab-TACS® procedure delivers label-free, non-activated target cells in a standardized manner of highly reproducible quality from a variety of single cell suspensions, e.g. whole blood or buffy coat allowing a multitude of downstream applications.

 

Watch this YouTube video tutorial to get further insights into the Fab-TACS® technology:

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General procedure of Fab-TACS® - Workflow

Columns for either Fab-TACS® Gravity or FABian® are filled with a Strep-Tactin® coated matrix made of cell-grade agarose. Strep-tagged Fab fragments (Fab-Streps) specifically bind to the matrix. Subsequently, whole blood or samples from other sources, e.g. mouse spleen cells pass through the column. Target cells adhere to the matrix based on the exclusive binding of the Fab-Strep to the target cell. Non-target cells are efficiently washed away. In a final step, the addition of biotin causes the elution of the target cells and the Fab-Streps. After elution, the Fab-Streps self-dissociate from the cell surfaces. The label-free authentic target cells are now ready for further downstream applications.

Further details can be found here:

Fab-TACS® Gravity

FABian®