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Related Concept Videos

Inhibitors of Bacterial Protein Synthesis01:25

Inhibitors of Bacterial Protein Synthesis

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Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...
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Inhibitors of Gram-positive Cell Wall Synthesis01:23

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Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...
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Inhibitors of Bacterial DNA Synthesis01:28

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Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These...
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Enzyme Inhibition01:30

Enzyme Inhibition

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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: 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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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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Updated: Mar 25, 2026

A Fluorescence-based Protocol for Preliminary Screening of Protein Synthesis Inhibitors from Natural Sources
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A Fluorescence-based Protocol for Preliminary Screening of Protein Synthesis Inhibitors from Natural Sources

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Polyhalogenobenzimidazoles: synthesis and their inhibitory activity against casein kinases.

Mariola Andrzejewska1, Mario A Pagano, Flavio Meggio

  • 1Institute of Chemistry, Agricultural University, 159C Nowoursynowska St., 02-787 Warsaw, Poland.

Bioorganic & Medicinal Chemistry
|August 21, 2003
PubMed
Summary
This summary is machine-generated.

Novel polyhalogenated benzimidazoles were synthesized and tested as inhibitors of casein kinases. Certain derivatives showed potent inhibition against CK1 and CK2, suggesting therapeutic potential.

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Sigma's Non-specific Protease Activity Assay - Casein as a Substrate
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Area of Science:

  • Medicinal Chemistry
  • Biochemistry
  • Organic Synthesis

Background:

  • Casein kinases (CK1, CK2, G-CK) are crucial enzymes involved in various cellular processes.
  • Dysregulation of casein kinases is implicated in diseases like cancer.
  • Developing specific kinase inhibitors is a key therapeutic strategy.

Purpose of the Study:

  • To synthesize novel polyhalogenated benzimidazoles.
  • To evaluate the inhibitory potential of these compounds against casein kinases CK1, CK2, and G-CK.
  • To explore structure-activity relationships for kinase inhibition.

Main Methods:

  • Exhaustive bromination of 2-substituted benzimidazoles to yield polyhalogenated derivatives.
  • In vitro enzymatic assays to determine the inhibitory efficacy (IC50 values) against CK1, CK2, and G-CK.
  • Systematic variation of substituents at N-1 and position 2 of the benzimidazole core.

Main Results:

  • 4,5,6,7-Tetrabromobenzimidazole derivatives showed significant inhibition against CK2 (IC50: 0.49-0.93 µM).
  • These derivatives were largely ineffective against CK1 and G-CK.
  • Compounds with chlorine, bromine, or sulfur at position 2 demonstrated potent inhibition against CK1 (IC50: 18.4-2.2 µM) while retaining CK2 inhibitory activity.
  • N-1 alkyl and 2-polyfluoroalkyl substituents did not significantly impact CK2 inhibition.

Conclusions:

  • Polyhalogenated benzimidazoles are effective inhibitors of CK2.
  • Specific substitution patterns, particularly at position 2, can confer potent inhibitory activity against CK1.
  • These compounds represent promising leads for developing targeted therapies for diseases involving CK1 and CK2.
  • Further structural modifications could optimize selectivity and potency.