Cellular and Molecular Neurobiology

, Volume 21, Issue 3, pp 285–296 | Cite as

Butyrylcholinesterase-Mediated Enhancement of the Enzymatic Activity of Trypsin

  • Sultan Darvesh
  • Rohit Kumar
  • Sheila Roberts
  • Ryan Walsh
  • Earl Martin


1. Acetylcholinesterase (AChE, EC and butyrylcholinesterase (BuChE, EC are enzymes that catalyze the hydrolysis of esters of choline.

2. Both AChE and BuChE have been shown to copurify with peptidases.

3. BuChE has also been shown to copurify with other proteins such as transferrin, with which it forms a stable complex. In addition, BuChE is found in association with β-amyloid protein in Alzheimer brain tissues.

4. Since BuChE copurifies with peptidases, we hypothesized that BuChE interacts with these enzymes and that this association had an influence on their catalytic activities. One of the peptidases that copurifies with cholinesterases has specificity similar to trypsin, hence, this enzyme was used as a model to test this hypothesis.

5. Purified BuChE causes a concentration-dependent enhancement of the catalytic activity of trypsin while trypsin does not influence the catalytic activity of BuChE.

6. We suggest that, in addition to its esterase activity, BuChE may assume a regulatory role by interacting with other proteins.

butyrylcholinesterase acetylcholinesterase trypsin Alzheimer 


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Copyright information

© Plenum Publishing Corporation 2001

Authors and Affiliations

  • Sultan Darvesh
    • 1
    • 2
    • 3
  • Rohit Kumar
    • 2
  • Sheila Roberts
    • 3
  • Ryan Walsh
    • 3
  • Earl Martin
    • 3
  1. 1.Department of Medicine (Neurology and Geriatric Medicine)HalifaxCanada
  2. 2.Department of Anatomy and NeurobiologyDalhousie UniversityHalifaxCanada
  3. 3.Department of ChemistryMount Saint Vincent UniversityHalifaxCanada

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