For the best experience on the Abcam website please upgrade to a modern browser such as Google Chrome
What are Affibody Molecules?
Affibody® affinity ligands are unique research reagents, produced using innovative protein-engineering technologies. They are small, simple proteins composed of a three-helix bundle based on the scaffold of one of the IgG-binding domains of Protein A. Protein A is a surface protein from the bacterium Staphylococcus aureus. This scaffold has excellent features as an affinity ligand and can be designed to bind with high affinity to any given target protein. The domain consists of 58 amino acids, 13 of which are randomized to generate Affibody® libraries with a large number of ligand variants. Thus, the libraries consist of a multitude of protein ligands with an identical backbone and variable surface-binding properties. In function, Affibody® Molecules mimic monoclonal antibodies. Compared to antibodies, the most striking dissimilarity of Affibody® Molecules is the small size. Affibody® Molecules have a molecular weight of 14kDa, compared to the molecular weight of antibodies, which is 150kDa. In spite of its small size, the binding site of Affibody® Molecules is similar to that of an antibody. The advantages of Affibody® Molcules over antibodies are: -their small size -the simple structure of the molecules -its robust physical properties; able to withstand a broad range of analytical conditions, including extreme pH and elevated temperature -its ability to fold correctly intracellularly -the fast and cost effective production in bacteria -the potential to couple Affibody® Molecules in multimeric constructs Affibody® Molecules have highly competitive properties for applications within affinity purification, sample preparation, protein detection and in vitro diagnostics.
Our Abpromise guarantee covers the use of ab31896 in the following tested applications.
|IHC-Fr||Use at an assay dependent dilution.
Staining of paraffin embedded tissues is not recommended.
AFFIBODY® MOLECULES ARE PROTOCOL SPECIFIC. PLEASE REFER TO THE "PROTOCOLS" SECTION.
Frozen tissue sections of a SK-OV-3 xenograft tumor was stained with HRP-conjugated Anti-ErbB2 Affibody® molecule. Strong membrane staining was observed in tumor cells but not in mouse conncective tissues.
IMMUNOHISTOCHEMICAL STAINING OF FROZEN TISSUE SECTIONS
Xenograft tumors of the human ovarian adenocarcinoma, SK-OV-3 was soaked in formaldehyde and then snap-frozen in liquid nitrogen and used for immunohistochemical staining with the HRP-conjugated Anti- ErbB2 Affibody® molecule. Frozen tissue sections were stained with HRP-conjugated Anti-ErbB2 Affibody® molecule for 45 minutes at room temperature. The staining was developed with DAB substrate and the tissue sections were counter stained with Mayers Haematoxylin. The resulting microscope image shows strong brown membrane staining of tumor cells in the xenograft whereas the mouse connective tissue that surrounds and traverses the tumor remains negative. Thus, the HRP-conjugated Anti-ErbB2 Affibody® molecule is a rapid reagent for ErbB2 specific immunohistochemical staining of frozen tissue sections.
Since staining with HRP-conjugated Anti-ErbB2 Affibody® molecule is a single step, the process is completed in less than 1 hour.
ab31896 has not yet been referenced specifically in any publications.