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Indirect-Acting Cholinergic Agonists: Mechanism of Action

Indirect-Acting Cholinergic Agonists: Mechanism of Action

Indirect-acting cholinergic agonists work by interacting with an enzyme called acetylcholinesterase (AChE) in the synaptic cleft. They can be reversible or irreversible inhibitors and have different effects on the enzyme.
Reversible inhibitors like edrophonium bind to a specific part of the enzyme called the anionic catalytic site. They form noncovalent bonds, which means they are not strongly attached to the enzyme. This creates a temporary and less stable enzyme–inhibitor complex, leading to...

Cholinesterases: Distribution and Function

Cholinesterases: Distribution and Function

Cholinesterases are a group of serine hydrolase enzymes that play a crucial role in the breakdown of choline esters. The two primary types of cholinesterases are acetylcholinesterases (AChEs) and butyrylcholinesterase (BuChEs), which differ in their distribution, function, and substrate specificity. AChEs, also known as true cholinesterases, specifically hydrolyze acetylcholine, while BuChEs, often referred to as pseudocholinesterases, can hydrolyze various choline esters, including...

Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
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Cholinergic Neurons: Neurotransmission

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Anticholinesterase Agents: Poisoning and Treatment

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Anticholinesterases, also known as cholinesterase inhibitors, work by blocking the breakdown of acetylcholine, leading to its accumulation in the synaptic cleft. This accumulation indirectly enhances both muscarinic and nicotinic actions. These agents are classified as reversible or irreversible based on their mechanism of action.
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Indirect-Acting Cholinergic Agonists: Pharmacokinetics

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Indirect-acting cholinergic agonists, or anticholinesterases, enhance the body's cholinergic activity by inhibiting acetylcholine's breakdown. They are categorized as reversible or irreversible agents based on their mechanism of action. They are further classified into short-acting, intermediate-acting, and long-acting agents based on their duration of action.
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Related Experiment Video

Updated: Jun 12, 2026

Direct Detection of the Acetate-forming Activity of the Enzyme Acetate Kinase

Direct Detection of the Acetate-forming Activity of the Enzyme Acetate Kinase

Published on: December 19, 2011

Acetylcholinesterase - the acyl-enzyme intermediate.

H C Froede¹, I B Wilson

¹Univ. of Colorado, Dept. of Chemistry Boulder, Colorado 80309 U.S.A.

Neurochemistry International

|May 22, 2010

Summary

The acetyl-enzyme theory explains acetylcholinesterase activity. Organophosphates inhibit this enzyme, and studies show 60-70% of the enzyme forms an acetyl-enzyme intermediate.

Area of Science:

Biochemistry
Enzymology
Neuroscience

Background:

Acetylcholinesterase (AChE) is crucial for neurotransmission.
The acetyl-enzyme theory describes AChE's hydrolytic mechanism.
Organophosphates are potent AChE inhibitors, impacting nerve function.

Purpose of the Study:

To investigate the origin and significance of the acetyl-enzyme intermediate in AChE reactions.
To explore the relationship between the acetyl-enzyme theory and organophosphate inhibition of AChE.
To quantify the steady-state concentration of the acetyl-enzyme.

Main Methods:

Outlining the historical development of the acetyl-enzyme theory.
Emphasizing the link between the theory and organophosphate inhibition.

More Related Videos

Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase

Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase

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Expression, Purification, Crystallization, and Enzyme Assays of Fumarylacetoacetate Hydrolase Domain-Containing Proteins

Expression, Purification, Crystallization, and Enzyme Assays of Fumarylacetoacetate Hydrolase Domain-Containing Proteins

Published on: June 20, 2019

Related Experiment Videos

Last Updated: Jun 12, 2026

Direct Detection of the Acetate-forming Activity of the Enzyme Acetate Kinase

Direct Detection of the Acetate-forming Activity of the Enzyme Acetate Kinase

Published on: December 19, 2011

Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase

Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase

Published on: November 23, 2016

Expression, Purification, Crystallization, and Enzyme Assays of Fumarylacetoacetate Hydrolase Domain-Containing Proteins

Expression, Purification, Crystallization, and Enzyme Assays of Fumarylacetoacetate Hydrolase Domain-Containing Proteins

Published on: June 20, 2019

Measuring the steady-state concentration of the acetyl-enzyme using radiolabeled acetylcholine.

Main Results:

The study quantifies the acetyl-enzyme intermediate concentration.
Between pH 6.0 and 9.0, 60-70% of the 18S enzyme is acetylated.
Measurements were conducted at 22°C and high ionic strength.

Conclusions:

The findings support the acetyl-enzyme theory's relevance to AChE function.
The study provides quantitative data on the acetyl-enzyme intermediate.
Understanding this intermediate is key to comprehending AChE inhibition by organophosphates.