Recombinant Human Cathepsin A/Lysosom Carboxypeptidase A, CF

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R&D Systems Recombinant Proteins and Enzymes
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Citations (4)
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Recombinant Human Cathepsin A/Lysosom Carboxypeptidase A, CF Summary

Product Specifications

>95%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Endotoxin Level
<1.0 EU per 1 μg of the protein by the LAL method.
Measured by its ability to cleave the fluorogenic peptide substrate, Mca-RPPGFSAFK(Dnp)-OH (Catalog # ES005). The specific activity is >75 pmol/min/µg, as measured under the described conditions.
Mouse myeloma cell line, NS0-derived human Cathepsin A/Lysosomal Carboxypeptidase A protein
Ala29-Tyr480, with a C-terminal 10-His tag
Accession #
N-terminal Sequence
Structure / Form
Pro form
Predicted Molecular Mass
53 kDa
51-62 kDa, reducing conditions

Product Datasheets

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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 and NaCl.
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

  • Activation Buffer: 25 mM MES, 5 mM DTT, pH 6.0
  • Assay Buffer: 25 mM MES, 5 mM DTT, pH 5.5
  • Recombinant Human Cathepsin A/Lysosomal Carboxypeptidase A (rhCathepsin A) (Catalog # 1049-SE)
  • Recombinant Human Cathepsin L (rhCathepsin L) (Catalog # 952-CY)
  •  E 64 (Tocris Catalog # 5208) , 50 mM stock in DMSO
  • Substrate: MCA-Arg-Pro-Pro-Gly-Phe-Ser-Ala-Phe-Lys(DNP)-OH (Catalog # ES005)
  • F16 Black Maxisorp Plate (Nunc, Catalog # 475515)
  • Fluorescent Plate Reader (Model: SpectraMax Gemini EM by Molecular Devices) or equivalent
  1. Dilute rhCathepsin A to 100 µg/mL in Activation Buffer.
  2. Dilute rhCathepsin L to 10 µg/mL in Activation Buffer.
  3. Combine equal volumes of rhCathepsin A and rhCathepsin L for final concentrations of 50 µg/mL and 5 µg/mL, respectively.
  4. Incubate reaction at 37 °C for 30 minutes.
  5. Stop reaction by adding E-64 to a final concentration of 10 µM.
  6. Dilute activated rhCathepsin A to 2.0 ng/µL in Assay Buffer.
  7. Dilute Substrate to 20 µM in Assay Buffer.
  8. Load 50 µL of 2.0 ng/µL rhCathepsin A into a plate, and start the reaction by adding 50 µL of 20 µM Substrate. Include a Substrate Blank containing 50 µL Assay Buffer and 50 µL of 20 µM Substrate.
  9. Read at excitation and emission wavelengths of 320 nm and 405 nm (top read), respectively, in kinetic mode for 5 minutes.
  10. Calculate specific activity:

     Specific Activity (pmol/min/µg) =

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

     *Adjusted for Substrate Blank
     **Derived using calibration standard MCA-Pro-Leu-OH (Bachem, Catalog # M-1975)

Per Well:
  • rhCathepsin A: 0.1 µg
  • Substrate: 10 µM
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Background: Cathepsin A/Lysosomal Carboxypeptidase A

Cathepsin A/lyososomal carboxypeptidase A is a member of the serine carboxypeptidase family (1). Cathepsin A is a multifunctional enzyme that expresses deaminidase and esterase activities at neutral pH and carboxypeptidase activity at acidic pH. Also known as protective protein, its association with beta -galactosidase ( beta -gal) and neuraminidase is essential for beta -gal stability and neuraminidase activation in the lysosomes. Inherited deficiency of Cathepsin A causes the lysosomal storage disorder galactosialidosis, characterized by a combined secondary deficiency of beta -gal and neuraminidase. Cathepsin A is capable of hydrolyzing a variety of bioactive peptide hormones including tachykinins, indicating that extralysosomal Cathepsin A plays a role in regulation of functions of these molecules (2). Cathepsin A is synthesized as a single-chain precursor and processed into heavy (32 kDa) and light (20 kDa) chains, which are linked by disulfide bonds.

  1. Pshezhetsky, A.V. (2004) in Handbook of Proteolytic Enzymes (ed. Barrett, A.J. et al.) p. 1923, Academic Press, San Diego.
  2. Hiraiwa, M. (1999) Cell. Mol. Life. Sci. 56:894.
Entrez Gene IDs
5476 (Human); 19025 (Mouse)
Alternate Names
beta-galactosidase 2; beta-galactosidase protective protein; Carboxypeptidase C; Carboxypeptidase L; Cathepsin A; cathepsin ANGBE; CTSA; EC 3.4.16; EC; GLB2; GSL; Lysosomal Carboxypeptidase A; lysosomal protective protein; PPCA; PPGBprotective protein for beta-galactosidase (galactosialidosis); Protective protein cathepsin A; Protective protein for beta-galactosidase

Citations for Recombinant Human Cathepsin A/Lysosom Carboxypeptidase A, CF

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

4 Citations: Showing 1 - 4
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  1. Activation of Tenofovir Alafenamide and Sofosbuvir in the Human Lung and Its Implications in the Development of Nucleoside/Nucleotide Prodrugs for Treating SARS-CoV-2 Pulmonary Infection
    Authors: J Li, S Liu, J Shi, HJ Zhu
    Pharmaceutics, 2021;13(10):.
    Species: Human
    Sample Types: Whole Tissue
    Applications: enzyme activity
  2. Lysosome-targeted beta-galactosidase negatively regulates neuraminidase 1 (NEU1) and promotes NEU1 deficiency in GM1 gangliosidosis
    Authors: AR Luu, H Wong, V Agrawal, N Wise, B Handyside, MJ Lo, G Pacheco, JB Felix, A Giaramita, A d'Azzo, J Vincelette, S Bullens, S Bunting, TM Christians, C Hague, JH Lebowitz, G Yogalingam
    J. Biol. Chem., 2020;0(0):.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay
  3. Cathepsin A is expressed in primary human antigen-presenting cells.
    Authors: Reich M, Spindler KD, Burret M, Kalbacher H, Boehm BO, Burster T
    Immunol. Lett., 2010;128(2):143-7.
    Species: N/A
    Sample Types: N/A
    Applications: Western Blot
  4. Mechanism of activation of PSI-7851 and its diastereoisomer PSI-7977.
    Authors: Murakami E, Tolstykh T, Bao H, Niu C, Steuer HM, Bao D, Chang W, Espiritu C, Bansal S, Lam AM, Otto MJ, Sofia MJ, Furman PA
    J. Biol. Chem., 2010;285(45):34337-47.
    Species: Synthetic
    Sample Types: Small Molecule
    Applications: Enzyme Assay


  1. Where does Cathepsin A cleave Mca-RPPGFSAFK(Dnp)-OH Fluorogenic Peptide Substrate, Catalog # ES005?

    • Although the QC assay conditions provided on our recombinant Cathepsin A datasheets should favor carboxypeptidase activity, it is possible that there is more than one site in the ES005 peptide recognized and cleaved by Cathepsin A.  We have not performed verification experiments to confirm the cleavage site preferred in our reaction conditions.

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