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Inhibitors of Bacterial Protein Synthesis01:25

Inhibitors of Bacterial Protein Synthesis

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...
Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...

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Related Experiment Video

Updated: Jul 7, 2026

System for Efficacy and Cytotoxicity Screening of Inhibitors Targeting Intracellular Mycobacterium tuberculosis
09:57

System for Efficacy and Cytotoxicity Screening of Inhibitors Targeting Intracellular Mycobacterium tuberculosis

Published on: April 5, 2017

Spin-labeled rifamycin: biological activity.

Z Z Raykov1, K Vassilev, G Grigorova

  • 1German Cancer Research Center, Heidelberg, Germany.

Die Pharmazie
|February 15, 2008
PubMed
Summary

New spin-labeled rifamycin derivatives (1 and 4) exhibit significant antitumor and antibacterial activity. Compound 1 showed differential toxicity in cancer cell lines, with potential applications in cancer therapy and infectious diseases.

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Quantitative Structure-Activity Relationship, Activity Prediction, and Molecular Dynamics of Non-nucleotide Reverse Transcriptase Inhibitors
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Quantitative Structure-Activity Relationship, Activity Prediction, and Molecular Dynamics of Non-nucleotide Reverse Transcriptase Inhibitors

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Last Updated: Jul 7, 2026

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Quantitative Structure-Activity Relationship, Activity Prediction, and Molecular Dynamics of Non-nucleotide Reverse Transcriptase Inhibitors

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Area of Science:

  • Medicinal Chemistry
  • Pharmacology
  • Biochemistry

Background:

  • Rifamycin derivatives are explored for their therapeutic potential.
  • Spin-labeling and structural modification can alter drug properties.
  • Understanding cytotoxicity and antitumor activity is crucial for drug development.

Purpose of the Study:

  • To synthesize and characterize novel spin-labeled rifamycin derivatives.
  • To evaluate the in vitro cytotoxicity and antitumor activity of these derivatives.
  • To compare their efficacy against initial rifamycin and against each other in various cell lines.

Main Methods:

  • Synthesis of 3-[(2,2,6,6-Tetramethylpiperidine-4-ylimino)methyl]rifamycin (4) and spin-labeled rifamycin-3-[(2,2,6,6-tetramethyl-1-oxyl-piperidine-4-ylimino)methyl]rifamycin (1).
  • Structural elucidation using IR, UV, MS, and 1H NMR.
  • Electron spin resonance (ESR) spectroscopy for spin-labeled compound.
  • In vitro cytotoxicity and antitumor assays on rat hepatoma and human fibroblast/fibrosarcoma cell lines, with and without oxidative stress.

Main Results:

  • Compounds 1 and 4 demonstrated a cytostatic effect of up to 85%.
  • Compound 1 exhibited lower toxicity in the hepatoma cell line compared to compound 4.
  • In human melanoma cell lines, compound 1 showed higher toxicity than compound 4.
  • Both derivatives displayed in vitro antibacterial activity comparable to rifampicin.

Conclusions:

  • The novel spin-labeled rifamycin derivatives possess significant in vitro antitumor and antibacterial properties.
  • Compound 1 demonstrates potential for targeted cancer therapy due to differential toxicity.
  • These findings support further investigation of these rifamycin derivatives as therapeutic agents.