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Related Concept Videos

Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

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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.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of...
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Structure-Activity Relationships and Drug Design01:28

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Drug design is a dynamic field that involves discovering and developing new medications based on specific biological targets. This process heavily relies on structure-activity relationships (SAR) and quantitative structure-activity relationships (QSAR) to guide the design and optimization of efficient drugs.
SAR studies the intricate relationship between a drug's chemical structure and biological activity. It focuses on understanding how modifications to a drug's structure can influence...
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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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Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:29

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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.
The direct-acting...
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Local Anesthetics: Chemistry and Structure-Activity Relationship01:30

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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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Related Experiment Video

Updated: Mar 17, 2026

Synthesis and Structure Determination of µ-Conotoxin PIIIA Isomers with Different Disulfide Connectivities
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Biosynthesis-driven structure-activity relationship study of premonensin-derivatives.

A Ismail-Ali1, E K Fansa2, N Pryk1

  • 1Fakultät für Chemie und Biochemie, Organische Chemie 1, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum, Germany. frank.schulz@rub.de.

Organic & Biomolecular Chemistry
|July 26, 2016
PubMed
Summary
This summary is machine-generated.

Modified biosynthesis rapidly generates novel polyketide compounds for drug discovery. These compounds target the oncogenic KRas pathway by interacting with PDE6δ, showing high affinity for potential cancer therapeutics.

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Area of Science:

  • Natural product chemistry
  • Drug discovery
  • Biotechnology

Background:

  • Controlled derivatization of natural products is crucial for drug discovery.
  • Rapid generation of compound libraries is needed for structure-activity relationship (SAR) studies.
  • Interference with the oncogenic KRas pathway is a key cancer research area.

Purpose of the Study:

  • To generate a library of reduced polyketides using modified biosynthesis.
  • To investigate the interaction of these polyketides with the KRas-interacting protein PDE6δ.
  • To identify novel compounds for targeting the oncogenic KRas pathway.

Main Methods:

  • Modified biosynthesis for polyketide library generation.
  • Polyketide derivatization via side chain alteration.
  • Manipulation of polyketide synthase for redox pattern and backbone length variation.
  • Structural and biophysical analyses of polyketide-PDE6δ interactions.

Main Results:

  • A library of reduced polyketides was successfully generated.
  • The structural and biophysical basis for polyketide interaction with PDE6δ was elucidated.
  • Non-natural polyketides with low nanomolar affinity to PDE6δ were identified.

Conclusions:

  • Modified biosynthesis is an effective strategy for generating diverse polyketide libraries.
  • Identified polyketides demonstrate high affinity for PDE6δ, suggesting therapeutic potential.
  • These findings contribute to the development of novel KRas pathway inhibitors for cancer treatment.