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Related Concept Videos

Cholinesterases: Distribution and Function01:22

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...
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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.
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...
Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:22

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

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.
The direct-acting...
Indirect-Acting Cholinergic Agonists: Mechanism of Action01:18

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...
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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.     
Irreversible agents form a strong bond with the cholinesterase enzyme, making it inactive. The breakdown of the phosphorylated enzyme is slower than the...
Cholinergic Neurons: Neurotransmission01:23

Cholinergic Neurons: Neurotransmission

Cholinergic neurotransmission involves the synthesis and the release of acetylcholine (ACh) in order to transmit nerve impulses across the synapse. The process begins with the synthesis of acetyl CoA, a precursor for ACh, from ATP, acetate, and coenzyme A in the mitochondria. Choline, another vital precursor, is transported inside the neuron through choline transporters, including high-affinity choline transporter CHT1, low-affinity choline transporter CTL1, and lower-affinity choline...

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Acetylcholinesterases--the structural similarities and differences.

Jirí Wiesner1, Zdenek Kriz, Kamil Kuca

  • 1National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kamenice 5/A4, 625 00 Brno, Czech Republic.

Journal of Enzyme Inhibition and Medicinal Chemistry
|September 13, 2007
PubMed
Summary
This summary is machine-generated.

Acetylcholinesterase (AChE) is crucial for nerve signals. While AChE inhibition is lethal, species-specific differences are minimal, complicating targeted pest control strategies.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Neuroscience

Background:

  • Acetylcholinesterase (AChE) is a vital enzyme in nerve signal transmission across many species.
  • AChE inhibition is a potent mechanism for organismal death, with implications for pest control and toxicology.
  • Understanding species-specific variations in AChE is critical for developing targeted interventions.

Purpose of the Study:

  • To investigate the theoretical structural basis for differences in acetylcholinesterase (AChE) between species.
  • To assess the evolutionary conservation of AChE enzymes.
  • To identify potential challenges in developing species-specific AChE inhibitors.

Main Methods:

  • Theoretical analysis utilizing primary and tertiary sequence alignments of acetylcholinesterase (AChE).

Main Results:

  • Acetylcholinesterase (AChE) enzymes exhibit significant evolutionary conservation across species.
  • Structural alignments indicate limited divergence in AChE primary and tertiary structures.
  • This high degree of conservation poses challenges for designing species-specific inhibitors.

Conclusions:

  • The high evolutionary conservation of acetylcholinesterase (AChE) across species is a key structural characteristic.
  • Developing targeted inhibitors for specific species, such as mosquitoes, is challenging due to conserved AChE structures.
  • Further research into subtle structural variations may be necessary for effective, species-specific pest control strategies.