Recombinant Human Vanin-1/VNN1 Protein, CF Summary
Gln22-Ser490, with a C-terminal 6-His tag
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.
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 HEPES, NaCl, DTT and Glycerol.|
|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.
- Assay Buffer: 50 mM HEPES, 2 mM DTT, 1% Brij-35 (w/v), pH 7.0
- Recombinant Human Vanin-1/VNN1 (rhVNN1) (Catalog # 7999-AH)
- Substrate: Pantethine (Sigma, Catalog # P2125) 50 mM stock in deionized water
- o-pthalaldehyde (Sigma, Catalog # P0657) 50 mg/mL (373 mM) stock in DMSO
- 0.5 M Sodium Borate, pH 9.0
- F16 Black Maxisorp Plate (Nunc, Catalog # 475515)
- Fluorescent Plate Reader (Model: Gemini EM by Molecular Devices) or equivalent
- Dilute rhVNN1 to 1 µg/mL in Assay Buffer.
- Dilute Substrate to 500 µM in Assay Buffer.
- Load 50 µL of dilute rhVNN1 to empty wells of a black well plate.
- Start reaction by adding 50 µL of dilute substrate to wells containing enzyme. Create Enzyme Controls by not adding substrate to the wells.
- Seal plate with a plate sealer and incubate at 37 °C for 30 minutes.
- Prepare Detection mixture containing 15 mM oPA in 0.5 M sodium borate, pH 9.0.
- Add 100 µL Detection mixture to all wells used. For Enzyme Controls, add dilute substrate after Detection Mixture is added.
- Mix well and incubate sealed plate at room temperature for 5 minutes.
- Read at excitation and emission wavelengths of 330 nm and 450 nm (top read), respectively, in endpoint mode.
- Calculate specific activity:
Specific Activity (pmol/min/µg) =
|Adjusted Fluorescence* (RFU) x Conversion Factor** (pmol/RFU)|
|Incubation time (min) x amount of enzyme (µg)|
*Adjusted for Enzyme Control
**Derived using calibration standard Cysteamine Hydrochloride (Sigma, Catalog # M6500).
- rhVNN1: 0.050 μg
- Substrate: 125 µM
Vanin‑1 (VNN1) is a member of the biotinidase family and is expressed at the cell surface in epithelial cells (1). VNN1 is also known as vascular non‑inflammatory molecule 1. It does not possess biotinidase activity, but is a pantetheinase that catalyzes the hydrolysis of pantetheine to pantothenic acid (vitamin‑B5) and cysteamine (2, 3). VNN1 is considered to be a potential biomarker for the acute kidney injury (4) and a target for therapeutic intervention in inflammatory bowel disease (5). Recombinant human VNN1 was engineered to have a C‑terminal truncation that prevents the normal GPI-anchor modification, resulting in its secretion.
- Pitari, G. et al. (2000) FEBS Lett. 483:149.
- Maras, B. et al. (1999) FEBS Lett. 461:149.
- Martin, F. et al. (2001) Immunogenetics 53:296.
- Hosohata, K. et al. (2012) J. Phamacol. Exp. Ther. 341:656.
- Berruyer, C. et al. (2006) J. Exp. Med. 203:2817.
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