Recombinant Human MAN2B1 Protein, CF

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R&D Systems Recombinant Proteins and Enzymes
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Product Details

Recombinant Human MAN2B1 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 hydrolyze 4-methylumbelliferyl-alpha -D-mannopyranoside. The specific activity is >1,500 pmol/min/μg, as measured under the described conditions.
Human embryonic kidney cell, HEK293-derived human MAN2B1 protein
Gly50-Gly1011, with a C-terminal 6-His tag
Accession #
N-terminal Sequence
Predicted Molecular Mass
110 kDa
109-127 kDa, reducing conditions

Product Datasheets

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: 50 mM Sodium Acetate, pH 4.5
  • Recombinant Human MAN2B1 (rhMAN2B1) (Catalog # 9826-GH)
  • Substrate: 4-Methylumbelliferyl-alpha -D-mannopyranoside (Sigma, Catalog # M3657), 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 rhMAN2B1 to 2 ng/μL in Assay Buffer.
  2. Dilute Substrate to 400 µM in Assay Buffer.
  3. Load 50 μL of 2 ng/μL rhMAN2B1 into the plate, and start the reaction by adding 50 μL of 400 µM Substrate. Include a Substrate Blank containing 50 μL of Assay Buffer and 50 μL of 400 µM Substrate.
  4. Read at excitation and emission wavelengths of 365 nm and 445 nm, respectively, (top read) 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 (Sigma, Catalog # M1381).

Per Well:
  • rhMAN2B1: 0.1 µg
  • Substrate: 200 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: MAN2B1

The lysosomal catabolism of N-glycans on mammalian glycoproteins occurs through the sequential exoglycosidase digestion of oligosaccharides from the non‑reducing terminus down to the carbohydrate-peptide core region (1). Included among the hydrolytic activities responsible for this oligosaccharide degradation is a broad specificity exo-alpha -mannosidase MAN2B1 that catalyzes the hydrolysis of alpha 1,2-, alpha 1,3-, and alpha 1,6-mannoside linkages present in complex, hybrid, and high mannose Asn-linked glycans (2, 3, 4). Defects in MAN2B1 result in lysosomal alpha -mannosidosis that shows symptom of mental retardation, recurrent infections, impaired hearing and Hurler-like skeletal changes (5, 6).

Long Name
Mannosidase alpha, Class 2B, Member 1
Entrez Gene IDs
4125 (Human); 17159 (Mouse); 361378 (Rat)
Alternate Names
alpha B, lysosomal; EC 3.2.1; EC; LAMAN; Lysosomal acid alpha-mannosidase; MAN2B1; MANB; Mannosidase alpha class 2B member 1; Mannosidase Alpha-B; mannosidase, alpha, class 2B, member 1

Manufacturing Specifications

  1. Aronson, N.N. Jr. and Kuranda, M.J. (1989) FASEB J. 3:2615.
  2. Liao, Y.F. et al. (1996) J. Biol. Chem. 271:28348.
  3. Gotoda, Y. et al. (1989) Am. J. Hum. Genet. 63:1015.
  4. Nebes, V.L. and Schmidt, M.C. (1994) Biochem. Biophys. Res. Commun. 200:239.
  5. Nilssen, O, et al. (1997) Hum. Mol. Genet. 6:717.
  6. Yu, P. et al. (2015) Genet. Med. 17:971.


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