Recombinant Human FAP His-tag (Mammalian) Protein, CF

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Recombinant Human FAP His-tag (Mammalian) Protein Enzyme Activity
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Product Details

Recombinant Human FAP His-tag (Mammalian) Protein, CF Summary

Product Specifications

>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Level
<0.10 EU per 1 μg of the protein by the LAL method.
Measured by its ability to convert the substrate benzyloxycarbonyl-Gly-Pro-7-amido-4-methylcoumarin (Z-GP-AMC) to Z-Gly-Pro and 7-amino-4-methylcoumarin (AMC). The specific activity is >2500 pmol/min/μg, as measured under the described conditions.
Chinese Hamster Ovary cell line, CHO-derived human Fibroblast Activation Protein alpha/FAP protein
Leu26-Asp760 with an N-terminal 6-His tag
Accession #
N-terminal Sequence
Predicted Molecular Mass
86 kDa
83-92 kDa, under reducing conditions

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Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.


Formulation Supplied as a 0.2 μm filtered solution in Tris, NaCl and Glycerol.
Shipping The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 6 months from date of receipt, -20 to -70 °C as supplied.
  • 3 months, -20 to -70 °C under sterile conditions after opening.

Assay Procedure

  • Assay Buffer: 50 mM Tris, 1 M NaCl, 1 mg/mL BSA, pH 7.5
  • Recombinant Human FAP (rhFAP) (Catalog # 10921-SE)
  • Substrate: Z-Gly-Pro-AMC (Bachem, Catalog # I-1145), 10 mM stock in DMSO
  • F16 Black Maxisorp Plate (Nunc, Catalog # 475515)
  • Fluorescent Plate Reader (Model: SpectraMax M5 by Molecular Devices) or equivalent
  1. Dilute rhFAP to 0.2 µg/mL in Assay Buffer. 
  2. Dilute Substrate to 200 µM in Assay Buffer.
  3. Load in a plate 50 µL of 0.2 µg/mL of rhFAP, and start the reaction by adding 50 µL of 200 µM Substrate. Include a Substrate Blank containing 50 µL of Assay Buffer and 50 µL of Substrate.
  4. Read at excitation and emission wavelengths of 380 nm and 460 nM (top read), respectively, in kinetic mode for 5 minutes.
  5. Calculate specific activity:

     Specific Activity (pmol/min/µg) =

Adjusted Vmax* (RFU/min) x Conversion Factor** (pmol/RFU)
amount of enzyme (µg)

*Adjusted Substrate Blank
**Derived using calibration standard 7-Amino, 4-Methyl Coumarin (Sigma, Catalog # A-9891).

Per Well:

  • rhFAP: 0.01 µg
  • Substrate: 100 µM

Data Images

Enzyme Activity Recombinant Human FAP His-tag (Mammalian) Protein Enzyme Activity View Larger

Recombinant Human FAP His-tag (Mammalian) (Catalog # 10921-SE) is measured by its ability to convert the substrate benzyloxycarbonyl-Gly-Pro-7-amido-4-methylcoumarin (Z-GP-AMC) to Z-Gly-Pro and 7-amino-4-methylcoumarin (AMC).

SDS-PAGE Recombinant Human FAP His-tag Protein SDS-PAGE. View Larger

2 μg/lane of Recombinant Human FAP His-tag Protein (Catalog # 10921-SE) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 83-92 kDa.

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Background: Fibroblast Activation Protein alpha/FAP

FAP (also known as seprase) is a 95 kDa Type II transmembrane serine protease that forms a homodimer and is structurally related to the dipeptidyl peptidase IV (DPPIV/CD26) family with a short cytoplasmic tail, a single transmembrane domain, and an extracellular domain that contains the active site (1-3). It exhibits dipeptidyl peptidase activity with substrate specificity similar to DPPIV, which is specific for N-terminal Xaa-Pro sequences (4,5). FAP is also an endopeptidase that can degrade Gelatin, Collagens I and IV, Fibronectin, and Laminin (1,4,5) as well as several peptide hormones (e.g. Neuropeptide Y, Brain Natriuretic Peptide, Substance P, Peptide YY, and Incretins) (6). FAP is also known to interact with several surface molecules to play roles in cell signaling, cell invasion and migration (3). Although not detectible in normal tissues, FAP is elevated in activated stromal fibroblasts, tumor-associated macrophages, activated hepatic stellate cells and myofibroblasts during pathological conditions that include tissue remodeling such as most types of cancer, wound healing, arthritis, atherosclerosis, and fibrosis (1,3,4,7-9). Targeting FAP with vaccines, antibodies, or pharmacologics impairs tumor progression in several cancer models making it a promising immunotherapy target (9-12).

  1. Zi, F. et al. (2015) Mol. Med. Rep. 11:3203.
  2. Pineiro-Sanchez, M.L. et al. (1997) J. Biol. Chem. 272:7595.
  3. Lay, A.J. et al. (2019) Front Biosci. 24:1.
  4. Park, J.E. et al. (1999) J. Biol. Chem. 274:36505.
  5. Aertgeerts, K. et al. (2005) J. Biol. Chem. 280:19441.
  6. Keane, F.M. et al. (2011) FEBS J. 278:1316.
  7. Rettig, W.J. et al. (1988) Proc. Natl. Acad. Sci. USA 85:3110.
  8. Bauer, S. et al. (2006) Arthritis Res. 8:R171.
  9. Jiang, G.M. et al. (2016) Oncotarget 7:33472.
  10. Cheng, J.D. et al. (2002) Cancer Res. 62:4767.
  11. Kraman, M. et al. (2010) Science 330:827.
  12. Busek, P. et al. (2018) Front. Biosci. 23:1933.
Entrez Gene IDs
2191 (Human); 14089 (Mouse); 102134935 (Cynomolgus Monkey)
Alternate Names
170 kDa melanoma membrane-bound gelatinase; DKFZp686G13158; DPPIV; EC 3.4.21.-; FAP; FAPA; Fibroblast Activation Protein alpha; fibroblast activation protein, alpha; Integral membrane serine protease; Seprase; vibronectin


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