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Cholinesterases: Distribution and Function01:22

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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...
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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.
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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.
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Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:22

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Cholinergic agonists or cholinomimetics mimic the action of acetylcholine to stimulate the parasympathetic nervous system. They are categorized into direct-acting and indirect-acting agents. The direct-acting cholinergic drugs induce the parasympathetic response by directly binding to the muscarinic or nicotine receptors. In comparison, the indirect-acting cholinergic drugs prevent acetylcholine hydrolysis, indirectly contributing to the extended parasympathetic response.
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Inhibitors are molecules that reduce enzyme activity by binding to the enzyme. In a normally functioning cell, enzymes are regulated by a variety of inhibitors. Drugs and other toxins can also inhibit enzymes. Some inhibitors bind to the enzyme’s active site, while others inhibit enzymatic activity by binding to other sites on the protein structure.
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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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Recent developments in structural studies on acetylcholinesterase.

Israel Silman1, Joel L Sussman2

  • 1Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel.

Journal of Neurochemistry
|May 16, 2017
PubMed
Summary
This summary is machine-generated.

Recent advances in vertebrate acetylcholinesterase research reveal new insights into enzyme structure and function. Studies explore high-resolution structures, protein redesign, and drug design implications for acetylcholinesterase.

Keywords:
PROSSacetylcholinesteraseback doorclick chemistrydonepezilmethylene blue

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Acetylcholinesterase (AChE) is a crucial enzyme in cholinergic neurotransmission.
  • Understanding AChE structure-function relationships is vital for drug development and toxicology.
  • Recent advancements have provided novel tools and insights into AChE.

Purpose of the Study:

  • To review recent developments in vertebrate acetylcholinesterase structure-function relationships.
  • To highlight novel structural and functional insights obtained through advanced techniques.
  • To discuss implications for protein engineering and structure-based drug design.

Main Methods:

  • High-resolution structural studies (X-ray crystallography) of human and snake venom AChE.
  • Development and application of protein redesign algorithms for prokaryotic expression.
  • 'Click chemistry' for in situ studies of active-site gorge dynamics.
  • Analysis of ligand-protein complex structures under varying crystallization conditions.

Main Results:

  • Visualization of open and closed states of the snake venom AChE 'back door'.
  • Successful redesign of human AChE for enhanced prokaryotic expression.
  • In situ click chemistry revealed steric and dynamic changes within the AChE active site.
  • Crystallization conditions significantly impact ligand alignment in AChE complexes.

Conclusions:

  • New structural data elucidate AChE conformational flexibility and dynamics.
  • Protein engineering strategies can overcome challenges in expressing complex enzymes like AChE.
  • Understanding ligand interactions and enzyme dynamics is crucial for rational drug design targeting AChE.
  • These findings advance our knowledge of acetylcholinesterase and its potential therapeutic modulation.