Related Experiment Video
Updated: Aug 2, 2026
11:38
Application of Fluorescent Nanoparticles to Study Remodeling of the Endo-lysosomal System by Intracellular Bacteria
Published on: January 2, 2015
[Effect of R plasmid on cell membrane structure in Salmonella derby]
A Z Pepoian1, G G Badalian, Zh A Ktsoian
1Institute of Molecular Biology, National Academy of Sciences of Armenia, 375044 Armenia.
Biofizika
|January 5, 2002
Summary
Salmonella derby cells with R-plasmids exhibit unique membrane structures, revealed by X-ray diffraction. These structures are linked to specific phospholipid arrangements and interactions within the cell membrane.
Area of Science:
- Membrane biophysics
- X-ray diffraction analysis
- Bacterial genetics
Context:
- Investigating the structural differences in Salmonella derby cell membranes.
- Comparing membranes of plasmid-containing cells versus plasmid-free cells.
- Utilizing X-ray diffraction to probe membrane organization.
Purpose:
- To elucidate the structural impact of R-plasmid presence on Salmonella derby cell membranes.
- To identify specific structural features associated with plasmid-carrying bacteria.
- To understand the molecular basis of observed membrane structural changes.
Summary:
- Small- and large-angle X-ray diffraction revealed distinct reflections (8 and 11 Å interplane distances) in plasmid-carrying Salmonella derby cells.
- These reflections suggest well-ordered, equidistant positioning of polar groups of phosphatidylcholine and phosphatidylethanolamine on the membrane surface.
- The formation of these ordered structures is hypothesized to result from unique hydrophilic-hydrophobic interactions of membrane phospholipids.
Impact:
- Provides insights into how extrachromosomal DNA (R-plasmid) influences bacterial membrane structure.
- Suggests a potential mechanism for altered membrane properties in plasmid-bearing bacteria.
- Highlights the role of specific phospholipid interactions in shaping bacterial membrane architecture.
