Related Experiment Videos
Lipid-amphotericin B complex structure in solution: a possible first step in the aggregation process in cell
A R Balakrishnan1, K R Easwaran
1Molecular Biophysics Unit, Indian Institute of Science, Bangalore.
Biochemistry
|April 20, 1993
Summary
Amphotericin B aggregates in lipid membranes, with aggregation speed influenced by sterols. It forms a 1:1 complex with phospholipids, involving interactions between the drug
Area of Science:
- Biochemistry
- Biophysics
- Pharmacology
Background:
- Amphotericin B is a vital polyene antifungal agent.
- Understanding its interaction with cell membranes is crucial for drug efficacy and toxicity.
Purpose of the Study:
- To elucidate the molecular interactions between amphotericin B and dipalmitoylphosphatidylcholine.
- To investigate the influence of sterols on amphotericin B aggregation in lipid environments.
Main Methods:
- Circular dichroism spectroscopy in vesicles and chloroform solutions.
- Nuclear magnetic resonance (1H, 13C, 31P) in chloroform solutions.
Main Results:
- Amphotericin B readily aggregates in lipid vesicles, dependent on lipid:drug ratio.
- Sterols accelerate amphotericin B aggregation in membranes.
- A stoichiometric 1:1 complex forms in chloroform, with specific drug-lipid interactions.
Conclusions:
- Amphotericin B forms a 1:1 complex with phospholipids via interactions with acyl chains and head groups.
- Membrane composition, including sterols, significantly modulates amphotericin B aggregation and potentially its function.