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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,...

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

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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.
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...

Feedback Inhibition

Feedback Inhibition

Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!

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Related Experiment Video

Updated: Jan 11, 2026

Measuring Spinal Presynaptic Inhibition in Mice By Dorsal Root Potential Recording In Vivo

Measuring Spinal Presynaptic Inhibition in Mice By Dorsal Root Potential Recording In Vivo

Published on: March 29, 2014

Structural basis for Porcupine inhibition.

Katrina A Black^1,2,3, Jesse I Mobbs^4,5, Hariprasad Venugopal⁶

¹The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia.

Communications Chemistry

|November 12, 2025

Summary

This summary is machine-generated.

Structural insights into Porcupine (PORCN) reveal how inhibitors bind to target Wnt-driven cancers. This research provides a foundation for developing improved PORCN inhibitors for cancer therapy.

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Last Updated: Jan 11, 2026

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Published on: January 18, 2013

Area of Science:

Biochemistry
Structural Biology
Cancer Biology

Background:

Wnt signalling is crucial for development and homeostasis.
Dysregulated Wnt signalling is linked to various cancers.
Porcupine (PORCN) enzyme is essential for Wnt protein secretion and activity.

Purpose of the Study:

To elucidate the structural basis of Porcupine (PORCN) function.
To understand the binding mechanism of PORCN inhibitors.
To provide a foundation for designing novel cancer therapeutics targeting Wnt signalling.

Main Methods:

High-resolution cryo-electron microscopy (cryo-EM) of human PORCN.
Structural analysis of PORCN in complex with inhibitors C59 and ETC159.
Molecular docking simulations of various PORCN inhibitors.

Main Results:

Determined cryo-EM structures of human PORCN in ligand-free and inhibitor-bound states.
Identified critical ordered water molecules forming a hydrogen-bonding network in the active site.
Demonstrated conserved binding conformations of diverse inhibitors within the acyl-CoA binding site, mediated by a water molecule.

Conclusions:

The study provides high-resolution structural data of PORCN, revealing key interactions for inhibitor binding.
Ordered water molecules play a crucial role in mediating inhibitor efficacy.
These findings support the rational design of next-generation PORCN inhibitors for enhanced cancer therapy.