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Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:29

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.
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Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

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Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
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Separation of...
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Indirect-Acting Cholinergic Agonists: Mechanism of Action01:18

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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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Cholinergic Antagonists: Chemistry and Structure-Activity Relationship01:29

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Cholinergic antagonists bind to cholinergic receptors and limit the effects of acetylcholine and other cholinergic agonists. Based on the specific cholinergic receptor affinity, these antagonists are classified as muscarinic or nicotinic. Anticholinergics interrupt parasympathetic innervations while sympathetic innervations remain uninterrupted. Muscarinic antagonists are also called 'muscarinic antagonists', 'antimuscarinics', or 'parasympatholytics'. Nicotinic...
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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.
The direct-acting...
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Local Anesthetics: Chemistry and Structure-Activity Relationship01:27

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Local anesthetics (LAs) are drugs that induce a temporary loss of sensation in a limited body area, preventing pain. Cocaine was the first local anesthetic discovered in the late 19th century. Cocaine is a benzoic acid ester obtained from the leaves of coca shrubs and was often used for its psychotropic effects. Cocaine was first isolated in 1860 by Albert Niemann. Sigmund Freud studied the physiological actions of cocaine. Carl Koller later introduced it into clinical practice in 1884 as a...
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Structures Controlled by Entropy: The Flexibility of Strychnine as Example.

Ulrich Sternberg1,2, Raiker Witter3,4,5

  • 1Research Partner of the Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), POB 3640, 76021 Karlsruhe, Germany.

Molecules (Basel, Switzerland)
|November 26, 2022
PubMed
Summary
This summary is machine-generated.

Molecular dynamics simulations with orientational constraints reveal new ring conformers of strychnine. These findings align with nuclear magnetic resonance data, expanding our understanding of molecular flexibility.

Keywords:
3J couplingsNOE distancesRDCconformersmolecular dynamics MDOC

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Area of Science:

  • Computational chemistry
  • Molecular biophysics
  • Structural biology

Background:

  • Strychnine's flexibility is not fully understood.
  • Traditional simulations may not capture the full conformational landscape.

Purpose of the Study:

  • To investigate the conformational flexibility of strychnine using a novel simulation method.
  • To explore how orientational constraints influence populated molecular structures.

Main Methods:

  • Molecular dynamics simulations with orientational tensorial constraints (MDOC).
  • Utilized nuclear magnetic resonance (NMR) derived data, including residual dipolar couplings (RDCs) and nuclear Overhauser effect (NOE) constraints.
  • Incorporated 3JHH couplings for validation.

Main Results:

  • MDOC simulations revealed previously uncharacterized ring conformers of strychnine.
  • These conformers are consistent with both RDCs and NOE-derived distance constraints.
  • The simulations demonstrated that MDOC populates structures influenced by both energy and entropy (TΔS).

Conclusions:

  • MDOC is effective in exploring the complete Gibbs free energy landscape of molecules.
  • New insights into strychnine's conformational flexibility have been gained.
  • The study validates the use of NMR-derived constraints in molecular dynamics for comprehensive structural analysis.