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Related Experiment Video

Updated: May 5, 2026

A Chromatin Assay for Human Brain Tissue

A Chromatin Assay for Human Brain Tissue

Published on: March 21, 2008

Studies on choline acetyltransferase isolated from human brain.

V K Singh¹, P L McGeer

¹Division of Neurological Sciences Department of Psychiatry, University of British Columbia, V6T 1W5, Vancouver, British Columbia, Canada.

Neurochemical Research

|November 26, 2013

Summary

Researchers purified human striatal choline acetyltransferase, determining its kinetic properties and molecular weight. Enzyme activity was modulated by salts, chelators, and inhibited by cupric sulfate.

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Area of Science:

Biochemistry
Neuroscience

Background:

Choline acetyltransferase (ChAT) is crucial for acetylcholine synthesis in the central nervous system.
Understanding ChAT's biochemical properties is vital for neurological research.

Purpose of the Study:

To characterize the purified human striatal choline acetyltransferase.
To determine its kinetic parameters, molecular weight, and response to various effectors.

Main Methods:

Purification of ChAT from human striatal tissue.
Enzyme kinetics assays using acetyl-coenzyme A and choline.
Molecular weight determination via Sephadex G-100 gel filtration.
Sedimentation analysis using sucrose-density gradients.
Assessing the effects of salts, chelating agents, and metal ions on enzyme activity.

Main Results:

The enzyme exhibited a Km of 8 μM for acetyl-coenzyme A and 250 μM for choline.
The predominant component had a molecular weight of approximately 67,000 daltons.
Activity was enhanced by salts (KCl, NaCl, (NH4)2SO4) and chelators (EDTA, EGTA).
Cupric sulfate (0.1 mM) caused near-complete inhibition, which was reversible by increasing enzyme, dithiothreitol, or EDTA concentrations.

Conclusions:

The study provides key biochemical and kinetic data for human striatal ChAT.
These findings contribute to understanding ChAT function and regulation in the brain.
The characterization offers insights into potential therapeutic targets for neurological disorders involving acetylcholine.