rFel d 1 (Felis domesticus 1.0101)

• Catalog Number: orb1088525
• Category: Proteins
• Description: Recombinant protein rFel d 1 is expressed in Escherichia coli. DNA sequence encoding 175 AAs was fused with Strep-tag at the N-terminus. A calculated molecular mass of recombinant protein is 19,4 kDa.
• Tested applications: ELISA, FC, WB
• Purity: Purified by sequential steps of ion exchange and affinity chromatography. Lyophilized from a 0.2 μm filtered solution in Storage buffer (100 mM Tris, 150 mM NaCl, 0.01% Tween 20, pH 8.0).
• UniProt ID: P30438, P30440
• Storage: Store at -20°C to -80°C. Reconstitute in sterile deionized water. Use reconstituted product immediately or aliquot for further storage at -20°C to -80°C.
• Note: For research use only
• Expiration Date: 12 months from date of receipt.

Recombinant allergen rFel d 1 purity verification. 5 µg of rFel d 1 with > 95 % purity checked by Coomassie Brilliant Blue stained SDS-PAGE.

ELISA (enzyme-linked immunosorbent assay) test was designed to prove the bond between the coated target recombinant allergen rFel d 1 and allergen-specific human plasma IgG4 antibodies of Felis domesticus positive donor. A measurable signal was subsequently generated by the addition of biotin labeled anti-human IgG4 (detection) antibody, Streptavidin-HRP and substrate solution (TMB). The intensity of the signal is proportional to the amount of coated rFel d 1.

Flow cytometry dot-plot staining pattern of rFel d 1 recombinant allergen stimulated human peripheral whole blood lymphocytes and basophils of a proven allergic donor stained using anti-human CD63 (MEM-259) FITC and anti-human CD203c (NP4D6) PE antibodies of BasoFlowEx kit.

Reactivity of rFel d 1 with sIgE antibodies in plasma of a patient with confirmed presence (routine clinical test) of specific IgE antibodies to cat epithelium allergen extract. Western blotting analysis was performed on recombinant allergen rFel d 1 mixed and heated (100°C, 5 min) with reducing SDS loading buffer. Sample was resolved using 15% Tris-glycine gel electrophoresis. Nitrocellulose membrane blot was incubated with plasma of an allergic patient (1:10). Captured rFel d 1 sIgE antibodies were detected by biotinylated anti-human IgE secondary antibody (2 μg/ml) followed by IRDye 800CW Streptavidin (1:5000).