Anti-Transferrin Affibody® Molecule (ab31910)
Overview
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Product name
Anti-Transferrin Affibody® Molecule -
Specificity
ab31910 recongises transferrin. -
Tested applications
Suitable for: ELISAmore details -
Species reactivity
Reacts with: Human -
Immunogen
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General notes
ab31910 is a recombinant protein produced in E. coli.
What are Affibody Molecules?
Affibody® affinity ligands 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. The current Affibody® libraries contains billions of variants. In function, Affibody® molecules mimic antibodies, nature’s own binders to an infinite number of antigens. Compared to antibodies, the most striking dissimilarity of Affibody® molecules is the small size. Affibody® molecules have a molecular weight of 14 kDa, compared to the molecular weight of antibodies, which is 150 kDa. In spite of its small size, the binding site of Affibody® molecules is similar to that of an antibody. The advantages of Affibody® molecules over antibodies are · their small size · the simple structure of the molecules · its robust physical properties · its ability to fold correctly intracellularly · the fast and cost-efficient production in bacteria · the possibility to produce Affibody® molecules through chemical synthesis · the possibility to couple Affibody® molecules in multimeric constructs.This product works very well for purification and depletion of transferin from plasma. This Anti-Tranferin Affibody® Molecule is modified with a unique C-terminal cysteine for directed single-point chemical modification, facilitating coupling to matrices. However, tail-to-tail dimers are spontaneously generated via a disulphide bridge between the C-terminal cysteines. Prior to coupling via the C-terminal the Affibody® Molecule needs to be reduced to expose the reactive cysteine residue. Recommended reducing condition is 20mM DTT at a pH above 7.5 and incubation at room temperature for 2 hours. Remove excess DTT by passage through a desalting column, not by dialysis.
THIS AFFIBODY® MOLECULE REQUIRES CONJUGATION TO A SUITABLE LABEL BEFORE USE. PLEASE REFER TO THE "PROTOCOLS" LINK BELOW.
Properties
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Form
Liquid -
Storage instructions
Shipped at 4°C. Store at +4°C short term (1-2 weeks). Upon delivery aliquot. Store at -20°C long term. -
Storage buffer
pH: 7.40
Constituents: 0.079% Ammonium bicarbonate, PBS -
Concentration information loading... -
Purification notes
ab31910 is >98% as determined by SDS-PAGE and RP-HPLC analysis. -
Affibody® molecule notes
What are Affibody Molecules?
Affibody® affinity ligands 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. The current Affibody® libraries contains billions of variants. In function, Affibody® molecules mimic antibodies, nature’s own binders to an infinite number of antigens. Compared to antibodies, the most striking dissimilarity of Affibody® molecules is the small size. Affibody® molecules have a molecular weight of 14 kDa, compared to the molecular weight of antibodies, which is 150 kDa. In spite of its small size, the binding site of Affibody® molecules is similar to that of an antibody. The advantages of Affibody® molecules over antibodies are · their small size · the simple structure of the molecules · its robust physical properties · its ability to fold correctly intracellularly · the fast and cost-efficient production in bacteria · the possibility to produce Affibody® molecules through chemical synthesis · the possibility to couple Affibody® molecules in multimeric constructs -
Research areas
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Function
Transferrins are iron binding transport proteins which can bind two Fe(3+) ions in association with the binding of an anion, usually bicarbonate. It is responsible for the transport of iron from sites of absorption and heme degradation to those of storage and utilization. Serum transferrin may also have a further role in stimulating cell proliferation. -
Tissue specificity
Expressed by the liver and secreted in plasma. -
Involvement in disease
Defects in TF are the cause of atransferrinemia (ATRAF) [MIM:209300]. Atransferrinemia is rare autosomal recessive disorder characterized by iron overload and hypochromic anemia. -
Sequence similarities
Belongs to the transferrin family.
Contains 2 transferrin-like domains. -
Cellular localization
Secreted. - Information by UniProt
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Alternative names
- Apotransferrin
- Beta 1 metal binding globulin
- Beta-1 metal-binding globulin
see all -
Database links
- Entrez Gene: 7018 Human
- Omim: 190000 Human
- SwissProt: P02787 Human
- Unigene: 518267 Human
Images
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ELISA - Anti-Transferrin Affibody® Molecule (ab31910)
Standard transferrin was titrated on Anti-Transferrin Affibody® molecule coated plates with a sensitivity of 30 ng/ml.
QUANTITATIVE ELISA
The Anti-Transferrin Affibody® molecule can be used as capture reagent in a sandwich ELISA in combination with a rabbit anti-transferrin antibody as the detection reagent. Titration of transferrin gives a sigmoid curve with a sensitivity of 30 ng transferrin/ml (defined as two times background value) and a measurement interval between 100 and 1000 ng/ml.
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Anti-Transferrin Affibody® Molecule (ab31910)ANALYSIS OF TRANSFERRIN CONCENTRATION IN DEPLETED PLASMA
The concentration of transferrin in plasma samples previously depleted from transferrin by passage through an Anti-Transferrin Affibody® molecule SulfoLink® Coupling Gel column, was analyzed using the Anti-Transferrin Affibody® ELISA. Flow through samples from 60, 600, 800 and 1200 ul depleted plasma were analyzed, the concentration of transferrin in the samples and the percentage of achived depletion are presented in table 1.
ANALYSIS OF TRANSFERRIN CONCENTRATION IN DEPLETED PLASMA
The concentration of transferrin in plasma samples previously depleted from transferrin by passage through an Anti-Transferrin Affibody® molecule SulfoLink® Coupling Gel column, was analyzed using the Anti-Transferrin Affibody® ELISA. Flow through samples from 60, 600, 800 and 1200 ul depleted plasma were analyzed, the concentration of transferrin in the samples and the percentage of achived depletion are presented in table 1.
