Recombinant Human Hexosaminidase A/HEXA Protein, CF

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R&D Systems Recombinant Proteins and Enzymes
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Citations (4)

Recombinant Human Hexosaminidase A/HEXA Protein, CF Summary

Learn more about Fluorescent Glycan Labeling and Detection

Product Specifications

>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Level
<1.0 EU per 1 μg of the protein by the LAL method.
Measured by its ability to hydrolyze 4-methylumbelliferyl-N-acetyl-beta -D-glucosaminide (4-MU-GlcNAc) The specific activity is >1,250 pmol/min/μg, as measured under the described conditions.
Spodoptera frugiperda, Sf 21 (baculovirus)-derived human Hexosaminidase A/HEXA protein
Met1-Thr529, with a C-terminal 6-His tag
Accession #
N-terminal Sequence
Predicted Molecular Mass
59 kDa
57-61 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

  • Assay Buffer: 100 mM Sodium Citrate, 250 mM NaCl, pH 4.5
  • Recombinant Human Hexosaminidase A/HEXA (rhHEXA) (Catalog # 6237-GH)
  • Substrate: 4-Methylumbelliferyl-N-Acetyl-beta -D-glucosaminide (4-MU-GlcNAc) (Sigma, Catalog # M2133), 50 mM stock in DMSO
  • F16 Black Maxisorp Plate (Nunc, Catalog # 475515)
  • Fluorescent Plate Reader (Model: SpectraMax Gemini EM by Molecular Devices) or equivalent
  1. Dilute rhHEXA to 5 ng/μL in Assay Buffer.
  2. Dilute Substrate to 800 μM in Assay Buffer.
  3. Load into a plate 50 μL of 5 ng/μL rhHEXA, and start the reaction by adding 50 μL of 800 μM Substrate. For Substrate Blanks, load 50 μL of Assay Buffer and 50 μL of 800 μM Substrate.
  4. Read plate at excitation and emission wavelengths of 365 nm and 445 nm, 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 for Substrate Blank
     **Derived using calibration standard 4-Methylumbelliferone (4-MU) (Sigma, Catalog # M1381).

Per Well:
  • rhHEXA: 0.250 μg
  • Substrate: 400 μM
Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Background: Hexosaminidase A/HEXA

beta -hexosaminidases are enzymes involved in the hydrolysis of terminal N-acetyl-D-hexosamine residues in GM2 gangliosides and globo-sphingolipids in lysosomes
(1‑4). The enzymes are composed of two alpha and/or beta  subunits, which are coded by HEXA and HEXB genes, respectively. Different association of the alpha and beta subunits gives rise to beta ‑hexosaminidase isoforms A, B and S (Hex A, B and S) (5), which have the composition of alpha beta, beta beta and alpha alpha, respectively. Our recombinant HEXA is presumably isoform Hex S, because only alpha subunit was expressed. Hex S is suggested to releases non‑reducing end N-acetylgalactosamine residues from dermatan sulfate, chondroitin sulfate and sulfated glycolipid SM2 (6). Recombinant HEXA is also highly active on 4-methylumbelliferyl-N-acetyl-beta -D-glucosaminide (6). Mutations in HEXA and HEXB genes cause lysosomal lipid storage disorders. Specifically, mutations of HEXA cause Tay-Sachs disease, manifested by the harmful accumulation of ganglioside GM2 in tissues and nerve cells in the brain (7‑10). Children with this disease usually die by age 4.

  1. Gilbert, F. et al. (1975) Proc. Natl. Acad. Sci. USA 72:263.
  2. Myerowitz, R. et al. (1985) Proc. Natl. Acad. Sci. USA 82:7830.
  3. Korneluk, R.G. et al. (1986) J. Biol. Chem. 261:8407.
  4. Mark, B.L. et al. (2003) J. Mol. Biol. 327:1093.
  5. Mahuran, D.J. et al. (1988) J. Biol. Chem. 263:4612.
  6. Hepbildikler, S.T. et al. (2002) J. Biol. Chem. 277:2562.
  7. Mahuran, D.J. (1991) Biochim. Biophys. Acta 1096:87.
  8. Mencarelli, S. et al. (2005) FEBS Lett. 579:5501.
  9. Neufeld, E.F. (1989) J. Biol. Chem. 264:10927.
  10. Ohno, K. et al. (2008) Mol. Genet. Metab. 94:462.
Entrez Gene IDs
3073 (Human)
Alternate Names
beta-hexosaminidase subunit alpha; Beta-N-acetylhexosaminidase subunit alpha; EC 3.2.1; EC; HEXA; hexosaminidase A (alpha polypeptide); Hexosaminidase A; Hexosaminidase subunit A; MGC99608; N-acetyl-beta-glucosaminidase subunit alpha; TSD

Citations for Recombinant Human Hexosaminidase A/HEXA Protein, 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. Synthesis, conformational analysis and glycosidase inhibition of bicyclic nojirimycin C-glycosides based on an octahydrofuro[3,2-b]pyridine motif
    Authors: J Désiré, Q Foucart, A Poveda, G Gourlaouen, Y Shimadate, M Kise, C Proceviat, R Ashmus, DJ Vocadlo, J Jiménez-Ba, A Kato, Y Blériot
    Carbohydrate research, 2021;511(0):108491.
    Species: Human
    Sample Types: Protein
    Applications: Bioassay
  2. Bi-functional IgG-lysosomal enzyme fusion proteins for brain drug delivery
    Authors: RJ Boado, JZ Lu, EK Hui, H Lin, WM Pardridge
    Sci Rep, 2019;9(1):18632.
    Species: Human
    Sample Types: Protein
    Applications: Bioassay
  3. Identification and characterization of the Onchocerca volvulus Excretory Secretory Product Ov28CRP, a putative GM2 activator protein
    Authors: FN Njume, SM Ghogomu, RA Shey, LOT Gainkam, P Poelvoorde, P Humblet, J Kamgno, A Robert, L Mutesa, C Lelubre, E Edelweiss, A Poterszman, S Anheuser, L Vanhamme, J Souopgui
    PLoS Negl Trop Dis, 2019;13(7):e0007591.
    Species: Nematode - Onchocerca volvulus
    Sample Types: Recombinant Protein
    Applications: Bioassay
  4. Human neutrophils secrete bioactive paucimannosidic proteins from azurophilic granules into pathogen-infected sputum.
    Authors: Thaysen-Andersen M, Venkatakrishnan V, Loke I, Laurini C, Diestel S, Parker B, Packer N
    J Biol Chem, 2015;290(14):8789-802.
    Species: N/A
    Sample Types: Protein
    Applications: Bioassay


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