Abstract
Inhibition of acetylcholinesterase activity by Al3+ has been examined by initial velocity kinetics and by a first-order kinetic method. Both methods yield an inhibition constant of approx. 1.7 mM at 0.1 M ionic strength. The initial velocity study indicates a noncompetitive mechanism of inhibition by Al3+. Inhibition at 10 mM ionic strength shows a Ki of 0.03 mM. Evaluation of the ionic strength dependence concurs with the results of Nolte et al. (Biochemistry 19 (1980) 3705). An effective charge in the binding site of -9 predicts the ratio of inhibition constants at high and low ionic strength. Extrapolation to zero ionic strength gives a Ki0 = 0.34 μM.
Original language | English (US) |
---|---|
Pages (from-to) | 261-264 |
Number of pages | 4 |
Journal | Biophysical Chemistry |
Volume | 21 |
Issue number | 3-4 |
DOIs | |
State | Published - Mar 1985 |
Keywords
- Acetylcholinesterase
- Aluminum inhibition
- Ionic strength dependence
ASJC Scopus subject areas
- Biophysics
- Biochemistry
- Organic Chemistry