Related Experiment Video
Updated: Nov 18, 2025
07:26
Size Exclusion Chromatography to Analyze Bacterial Outer Membrane Vesicle Heterogeneity
Published on: March 31, 2021
4.9K
Characterization and function of membrane vesicles in Gram-positive bacteria
Yina Cao1,2, Huancai Lin3,4
1Department of Preventive Dentistry, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China.
Applied Microbiology and Biotechnology
|February 6, 2021
Summary
Extracellular vesicles from Gram-positive bacteria, though studied later, are key communication tools. These membrane vesicles contain diverse molecules and play roles in stress, biofilms, and immunity.
Area of Science:
- Microbiology
- Cell Biology
Background:
- Extracellular vesicles (EVs) are increasingly recognized for their roles in biological communication.
- Research into Gram-positive bacterial membrane vesicles (GPMVs) lagged due to cell wall complexity and low vesicle yield.
- Recent advancements have significantly improved understanding of GPMV composition and function.
Purpose of the Study:
- To review the current knowledge on the composition and functions of membrane vesicles in Gram-positive bacteria.
- To highlight the biological significance and potential roles of GPMVs in host-pathogen interactions.
Main Methods:
- This review synthesizes findings from recent research on Gram-positive bacterial membrane vesicles.
- Analysis of existing literature on GPMV components and their reported biological activities.
Main Results:
- Gram-positive bacterial membrane vesicles are spherical, bilayer structures (20-400 nm in diameter).
- GPMVs contain diverse biomolecules, including proteins, nucleic acids, lipids, and metabolites.
- GPMVs are implicated in bacterial stress responses, biofilm formation, and immune modulation.
Conclusions:
- Membrane vesicles from Gram-positive bacteria are biologically significant due to their rich molecular cargo.
- GPMVs serve as crucial mediators in the communication between bacteria and their hosts.
- Further research into GPMVs holds promise for understanding and potentially manipulating bacterial pathogenesis.
More Related Videos
Related Concept Videos
01:33Overview of Secretory Vesicles
9.0K
Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
9.0K
01:22Bacterial Cell Wall
1.5K
The bacterial cell wall is an essential structural component that encases the plasma membrane, preserving cellular integrity, determining shape, and protecting against osmotic stress. This rigid yet flexible structure primarily comprises peptidoglycan, a polymer that forms a mesh-like matrix conferring mechanical strength and flexibility.Peptidoglycan Composition and StructurePeptidoglycan, the core of the bacterial cell wall, comprises alternating units of N-acetylglucosamine (NAG) and...
1.5K
00:59COP Coated Vesicles
15.1K
Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of...
15.1K
01:18Flagella and Motility in Bacteria
1.4K
Flagella are specialized, thread-like structures that extend from a bacteria's cell envelope. They play a crucial role in motility and chemotaxis. Their structural organization and functioning exemplify sophisticated biological engineering, enabling bacterial survival and adaptability in diverse environments.Structure of the FlagellumA bacterial flagellum consists of three key components: the filament, the hook, and basal body. The filament, a long, helical structure composed of repeating...
1.4K
01:17Gram-negative Bacterial Protein Secretion Systems
388
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):...
388
01:12Clathrin Coated Vesicles
8.4K
Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
8.4K