Multiple forms of acetylcholinesterase from pig brain.

Area of Science:

• Biochemistry
• Neuroscience
• Enzymology

Background:

• Acetylcholinesterase (AChE) is a crucial enzyme in cholinergic neurotransmission.
• Understanding the molecular forms of AChE is essential for elucidating its function.
• Previous studies have explored various methods for AChE solubilization and characterization.

Purpose of the Study:

• To investigate and compare different methods for solubilizing pig brain acetylcholinesterase.
• To analyze the multiple enzymic forms of AChE using polyacrylamide-gel electrophoresis.
• To determine the molecular weights and characteristics of different AChE forms.

Main Methods:

• Solubilization of pig brain acetylcholinesterase using various agents including butanol, Nagarse, ultrasonication, and detergents (Triton X-100, lysolecithin).
• Separation and analysis of solubilized AChE forms using multiple polyacrylamide-gel electrophoresis systems, including gradient gels.
• Examination of enzyme dissociation using urea treatment.

Main Results:

• Detergent treatments (Triton X-100, Triton X-100-KCl, lysolecithin) yielded effective solubilization of AChE.
• Polyacrylamide-gel electrophoresis revealed multiple forms of AChE, with the number of components varying from two to six depending on the extraction method.
• Gradient gel electrophoresis identified five frequently occurring AChE forms with average molecular weights ranging from 60,000 to 350,000.
• Urea treatment induced changes in AChE patterns, suggesting enzyme dissociation.

Conclusions:

• Detergent-based methods are optimal for solubilizing pig brain acetylcholinesterase while preserving its multiple forms.
• Polyacrylamide-gel electrophoresis is a powerful technique for resolving and characterizing the diverse molecular forms of AChE.
• The observed heterogeneity in AChE forms has implications for understanding its molecular structure and function.