Related Experiment Video

Updated: Feb 15, 2026

Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria
12:57

Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria

Published on: September 16, 2013

32.9K

Activity of siderophores against drug-resistant Gram-positive and Gram-negative bacteria

Karuna Gokarn1,2, Ramprasad B Pal1

  • 1Department of Microbiology, Sir Hurkisondas Nurrotumdas Medical Research Society.

Infection and Drug Resistance
|February 2, 2018
PubMed

Insights

Iron-chelating siderophores, exochelin-MS and deferoxamine-B, show promise in combating drug-resistant bacteria like MRSA and MDR Gram-negatives. Their combination with antibiotics effectively inhibits bacterial growth, offering a new strategy against antimicrobial resistance.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Pharmacology

Background:

  • Drug-resistant bacterial infections pose a significant global health threat.
  • Iron is essential for bacterial growth, making iron-chelating agents (siderophores) potential antimicrobial agents.
  • Specific drug-resistant pathogens include methicillin-resistant Staphylococcus aureus (MRSA) and metallo-β-lactamase (MBL) producing Pseudomonas aeruginosa and Acinetobacter baumannii.

Purpose of the Study:

  • To evaluate the inhibitory activity of exogenous siderophores, exochelin-MS and deferoxamine-B, against key drug-resistant bacteria.
  • To assess the synergistic effects of these siderophores when combined with antibiotics.
  • To explore iron-chelation therapy as a complementary strategy against bacterial drug resistance.

Main Methods:

  • Disc diffusion assays
  • Micro-broth dilution assays
  • Turbidimetric growth assays
  • Testing against MRSA, P. aeruginosa, and A. baumannii isolates

Main Results:

  • Siderophores exochelin-MS and deferoxamine-B demonstrated inhibitory activity against the tested drug-resistant bacteria.
  • Synergistic effects were observed when siderophores were combined with antibiotics, enhancing bacterial inhibition.
  • Minimum inhibitory concentrations (MICs) for exochelin-MS + ampicillin ranged from 0.05 to 0.5 mg/mL.
  • MICs for deferoxamine-B + ampicillin were 1.0 mg/mL or higher.

Conclusions:

  • Exogenous siderophores exhibit antimicrobial activity against important drug-resistant pathogens.
  • Combining siderophores with antibiotics offers a synergistic approach to overcome bacterial drug resistance.
  • Iron-chelation therapy represents a promising complementary strategy to combat life-threatening infections caused by multidrug-resistant bacteria.
Keywords:
deferoxamine Bexochelin MSiron-chelationxenosiderophores

More Related Videos

Generating Transposon Insertion Libraries in Gram-Negative Bacteria for High-Throughput Sequencing08:19

Generating Transposon Insertion Libraries in Gram-Negative Bacteria for High-Throughput Sequencing

Published on: July 7, 2020

11.4K
Purification and Visualization of Lipopolysaccharide from Gram-negative Bacteria by Hot Aqueous-phenol Extraction05:31

Purification and Visualization of Lipopolysaccharide from Gram-negative Bacteria by Hot Aqueous-phenol Extraction

Published on: May 28, 2012

36.8K

Related Concept Videos

Gram-negative Bacterial Protein Secretion Systems01:17

Gram-negative Bacterial Protein Secretion Systems

Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
1.1K
Positive, Negative, and Zero Work00:58

Positive, Negative, and Zero Work

Work is done on an object when energy is transferred to the object. In other words, work is done when a force acts on a body that undergoes a displacement from one position to another. By definition, the work done by a force is the integral of the force with respect to the displacement along its path. Forces can vary as a function of position, and displacements can occur along various paths between two points. The magnitude of a force multiplied by the cosine of the angle that the force makes...
22.3K
Positive and Negative Feedback Loops01:18

Positive and Negative Feedback Loops

Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires  maintaining an internal dynamic equilibrium:
25.5K
Sputum Studies I: Gram Stain, cytology, and Acid-fast smear and culture01:26

Sputum Studies I: Gram Stain, cytology, and Acid-fast smear and culture

Sputum studies are a critical part of diagnosing and treating numerous respiratory conditions. These studies involve obtaining sputum samples for analysis to identify pathogenic organisms and assess the presence of abnormal cells indicative of malignant conditions. This lesson will delve into three fundamental sputum studies: Gram Stain, Cytology, and Acid-fast Smear and Culture.
Gram Stain
The Gram Stain is an integral part of sputum studies. It involves the staining of sputum, which permits...
709
Negative Regulator Molecules01:23

Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
38.6K
Position-effect Variegation02:32

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
7.1K