Description
Demeclocycline hydrochloride is used to inhibit susceptible Gram-positive and Gram-negative bacteria and to study protein synthesis inhibition and tetracycline resistance mechanisms.
It is commonly incorporated into culture media or susceptibility assays to suppress sensitive organisms and to evaluate ribosomal targeting antibiotics in comparative studies.
Demeclocycline is a member of the tetracycline class that binds reversibly to the 30S ribosomal subunit, blocking the attachment of aminoacyl tRNA to the A-site of the ribosome. This action prevents elongation of the growing polypeptide chain and inhibits bacterial protein synthesis in susceptible strains. Its well characterized ribosomal mechanism makes it useful for examining translational control, resistance determinants such as efflux pumps and ribosomal protection proteins, and selective growth conditions in microbiological systems.
Key Features and Advantages
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30S Ribosomal Binding: Inhibits bacterial protein synthesis by preventing aminoacyl tRNA incorporation at the ribosomal A site.
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Broad Spectrum Activity: Active against many Gram-positive and Gram-negative bacteria, supporting versatile selective applications.
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Reversible Mode of Action: Bacteriostatic inhibition allows controlled studies of growth suppression without immediate lysis.
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Tool for Resistance Studies: Commonly used to investigate tetracycline resistance genes, including efflux and ribosomal protection mechanisms.
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Water Soluble Hydrochloride Form: Facilitates preparation of aqueous stock solutions for media supplementation.
Common Applications and Usage Notes
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Selective Media Preparation: Added to agar or broth to inhibit susceptible organisms during strain selection or contamination control.
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Antimicrobial Susceptibility Testing: Used in broth microdilution or agar based assays to determine minimum inhibitory concentrations.
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Tetracycline Resistance Research: Applied in studies evaluating resistance gene expression, horizontal gene transfer, and adaptive responses.
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Protein Synthesis Studies: Utilized to examine translational inhibition and ribosome function in bacterial systems.
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Comparative Antibiotic Analysis: Supports side by side evaluation of different ribosome targeting agents.
Practical Tips
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Light Sensitivity: Protect powder and prepared solutions from light exposure, as tetracyclines can degrade when exposed to light.
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Monitor Resistance Development: Include proper controls when maintaining cultures under tetracycline pressure to detect emerging resistance.
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Storage/Handling: Upon receipt, store at -20°C.
