Recombinant C. perfringens a-N-acetylgalactosaminidase, CF

Catalog # Availability Size / Price Qty
5705-GH-100
R&D Systems Recombinant Proteins and Enzymes
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Recombinant C. perfringens a-N-acetylgalactosaminidase, CF Summary

Product Specifications

Purity
>90%, 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.
Activity
Measured by its ability to cleave alpha -N-acetylgalactosaminyl from 4-Nitrophenyl N-acetyl-alpha -D-galactosaminide. The specific activity is >5,000 pmol/min/ug, as measured under the described conditions.
Source
E. coli-derived c. perfringens alpha-N-acetylgalactosaminidase/NAGA protein
Lys2-Lys619 with an N-terminal Met and 6-His tag
Accession # AAM55479
Accession #
N-terminal Sequence
Analysis
Met
Predicted Molecular Mass
75 kDa
SDS-PAGE
65 kDa, reducing conditions

Product Datasheets

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5705-GH

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.

5705-GH

Formulation Supplied as a 0.2 μm filtered solution in Tris and NaCl.
Shipping The product is shipped with dry ice or equivalent. 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, -70 °C as supplied.
  • 3 months, -70 °C under sterile conditions after opening.

Assay Procedure

Materials
  • Assay Buffer: 100 mM MES, pH 6.5
  • Recombinant C. perfringens alpha -N-acetylgalactosaminidase (rC. perfringens alpha -N-galactosaminidase) (Catalog # 5705-GH)
  • Substrate: 4-Nitrophenyl N-acetyl-alpha-D-galactosaminide (Sigma-Aldrich, Catalog # N4264)
  • 0.2 M NaOH, prepare in deionized water
  • 96-well Clear Plate (Costar, Catalog # 92592)
  • Plate Reader (Model: SpectraMax Plus by Molecular Devices) or equivalent
  1. Dilute rC. perfringens alpha -N-galactosaminidase to 1 ng/µL in Assay Buffer.
  2. Dilute Substrate to 2 mM in Assay Buffer.
  3. Combine 50 µL of alpha -N-galactosaminidase and 50 µL of Substrate in wells of a 96-well plate. Substitute alpha -N-galactosaminidase with Assay Buffer for Substrate Blank.
  4. Incubate at room temperature for 5 minutes.
  5. Stop the reaction by adding 100 µL of 0.2 M NaOH, which also develops the color.
  6. Read at 402 nm in endpoint mode.
  7. Calculate specific activity:

     Specific Activity (pmoles/min/µg) =

Adjusted Abs* (OD) x well volume (L) x 1012 pmol/M
Inc. time (min) x epsilon ** (M-1cm-1) x path corr.***(cm) x amount of enzyme (µg)

     *Adjusted for Substrate Blank

     **Using the extinction coefficient 17700  M-1cm-1

     ***Using the path correction 0.600 cm

Per Well:
  • rC. perfringens alpha -N-galactosaminidase: 0.05 µg
  • Substrate: 0.5 mM
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.

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Background: alpha-N-acetylgalactosaminidase/NAGA

The ABO blood group system is the most important blood type system and alpha -N-acetylgalactoside is key to the ABO blood group antigen (1). alpha -N-acetylgalactosidase from Clostridium perfringens is a useful tool for removing alpha linked N-acetylgalactosamine from blood type A antigen to produce H antigen and blood type O (2, 3). Blood type O is universally compatible in the ABO system and is widely used in blood transfusion (2). The enzyme was highly selective for terminal N‑acetylgalactosamine residues (3). No other exoglycosidase activities, particularly neuraminidase, was detected. Recombinant alpha -N-acetylgalactosidase from Clostridium perfringens can potentially be used in enzymatic conversion of human blood type A red blood cells to universally transfusable type O red blood cells.

References
  1. Watkins, W.M. (1980) Adv. Hum. Genet. 10:1.
  2. Liu, Q.P. et al. (2007) Nature Biotechnol. 25:454.
  3. Calcutt, M. J. et al. (2002) FEMS Microbiol. Lett. 214:77.
  4. Hsieh, H.Y. et al. (2003) Protein Expr. Purif. 32:309.
Entrez Gene IDs
4668 (Human); 17939 (Mouse); 315165 (Rat)
Alternate Names
alpha-N- (alpha-galactosidase B); alphaNacetylgalactosaminidase; alpha-N-acetylgalactosaminidase; EC 3.2.1; EC 3.2.1.49; GALB; N-acetylgalactosaminidase, alpha-; NAGA

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