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Recombinant Human Butyrylcholinesterase/BCHE Protein, CF

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Summary
Reactivity HuSpecies Glossary
Applications Enzyme Activity
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Recombinant Human Butyrylcholinesterase/BCHE Protein, CF Summary

Details of Functionality
Measured by its ability to cleave Butyrylthiocholine. The specific activity is >50,000 pmol/min/μg, as measured under the described conditions.
Source
Chinese Hamster Ovary cell line, CHO-derived human Butyrylcholinesterase/BCHE protein
Met1-Leu602, with a C-terminal 6-His tag
Accession #
N-terminal Sequence
Glu29
Structure / Form
Monomer and disulfide-linked homodimers
Protein/Peptide Type
Recombinant Enzymes
Gene
BCHE
Endotoxin Note
<1.0 EU per 1 μg of the protein by the LAL method.

Applications/Dilutions

Dilutions
  • Enzyme Activity
Theoretical MW
66 kDa.
Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.
SDS-PAGE
90-100 kDa, reducing conditions

Packaging, Storage & Formulations

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.
Buffer
Supplied as a 0.2 μm filtered solution in Tris and NaCl.
Assay Procedure
  • Assay Buffer: 100 mM Sodium Phosphate, pH 7.5
  • Recombinant Human Butyrylcholinesterase/BCHE (rhBCHE) (Catalog # 6137-CE)
  • Substrate: Butyrylthiocholine chloride (BTC) (Sigma Catalog # B3128), 20 mM stock in DMSO
  • 5,5’-dithio-bis (2-nitrobenzoic acid) (DTNB) (Sigma Catalog # D8130), 10 mM stock in DMSO
  • 96 well Clear Plate (Costar, Catalog # 92592)
  • Plate Reader (Model: SpectraMax Plus by Molecular Devices) or equivalent
  1. Dilute rhBCHE to 0.02 µg/mL in Assay Buffer.
  2. Dilute BTC and DTNB to 200 µM final concentrations in deionized water.
  3. Load into plate 50 µL of 0.02 µg/mL rhBCHE and start the reaction by adding 50 µL of the BTC/DTNB mixture to the wells. As a Substrate Blank, load 50 µL of Assay Buffer and 50 µL of the BTC/DTNB mixture.
  4. Read in kinetic mode for 5 minutes at an absorbance of 405 nm.
  5. Calculate specific activity:

     Specific Activity (pmol/min/µg) =

 Adjusted Vmax* (OD/min) x well volume (L) x 1012 pmol/mol
ext. coeff** (M-1cm-1) x path corr.*** (cm) x amount of enzyme (µg)

     *Adjusted for Substrate Blank 
     **Using the extinction coefficient 13260 M-1cm-1 
     ***Using the path correction 0.32 cm
     Note: the output of many spectrophotometers is in mOD Per Well:
  • rhBCHE: 0.001 µg
  • DTNB and BTC: 100 µM

Notes

This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for Recombinant Human Butyrylcholinesterase/BCHE Protein, CF

  • Acylcholine acylhydrolase
  • BCHE
  • Butyrylcholine esterase
  • Butyrylcholinesterase
  • CHE1
  • CHE1cholinesterase
  • Choline esterase II
  • cholinesterase 1
  • E1
  • EC 3.1.1.8
  • Pseudocholinesterase

Background

Butyrylcholinesterase (BCHE) is a major acetylcholine hydrolyzing enzyme in the circulation (1). Although it is present in significant amounts in human plasma, no endogenous physiological substrate has been described for this enzyme. It can degrade a large number of ester-containing compounds besides acylcholines, including neurotoxic organophosphate esters. Thus, it plays significant pharmacological and toxicological roles. It is thought to be involved in the pathological progression of Alzheimer’s disease (AD) by depleting acetylcholine. In contrast to ACHE, it attenuates amyloid fibril formation in vitro (2). BCHE inhibitors have been used to delay symptoms of AD patients by virtue of their ability to enhance ACH availability (3). Its involvement in the cholinergic anti-inflammatory pathway connects BCHE and ACHE as possible markers of low-grade systemic inflammation observed in Type-2 diabetes, obesity, hypertension, coronary heart disease, and AD (4). BCHE can exist as monomers, dimers, or tetramers (1).
  1. Darvesh, S. et al. (2003) Nat. Rev. Neurosci. 4:131.
  2. Diamant, S. et al. (2006) Proc. Nat. Acad. Sci. 103:8628.
  3. Campbell, V. A. and  Gowran, A. (2007) Br. J. Pharm. 152:655.
  4. Das, U. N. (2007) Med Sci Monit. 13:RA214.

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Bioinformatics

Gene Symbol BCHE
Uniprot