Related Experiment Video
Updated: Aug 8, 2026
11:45
Fluorescence Live-cell Imaging of the Complete Vegetative Cell Cycle of the Slow-growing Social Bacterium Myxococcus xanthus
Published on: June 20, 2018
Cell wall assembly in Bacillus subtilis: how spirals and spaces challenge paradigms
1Antimicrobial Research Centre and Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, Canada.
Molecular Microbiology
|May 13, 2006
Summary
New research on Bacillus subtilis reveals novel models for bacterial cell wall assembly, challenging existing paradigms of peptidoglycan and teichoic acid synthesis and organization.
Area of Science:
- Microbiology
- Cell Biology
- Biochemistry
Background:
- The bacterial cell wall, particularly in Bacillus subtilis, is crucial for cell viability and structure.
- Decades of research have established models for cell wall synthesis, but recent findings suggest complexities.
- Peptidoglycan and teichoic acid are key components with intricate biosynthetic pathways.
Purpose of the Study:
- To compare and contrast the transcompartmental biosynthesis of peptidoglycan and teichoic acid in Bacillus subtilis.
- To distinguish between current and emerging models of bacterial cell wall assembly and structure.
- To highlight challenges to existing paradigms of murein insertion and organization.
Main Methods:
- Comparative analysis of established and novel models of cell wall synthesis.
- Review of experimental evidence supporting cytoskeleton-dependent peptidoglycan insertion.
- Discussion of findings related to periplasmic compartments in Bacillus subtilis.
Main Results:
- Evidence supports directed, cytoskeleton-dependent insertion of nascent peptidoglycan.
- Emerging models propose a periplasmic compartment influencing cell wall assembly.
- These findings challenge the traditional understanding of murein insertion and organization.
Conclusions:
- Recent studies present novel and controversial models for Bacillus subtilis cell wall assembly.
- Directed peptidoglycan insertion and periplasmic compartments necessitate a re-evaluation of existing paradigms.
- Further research is needed to fully elucidate the mechanisms of bacterial cell wall construction.
Related Concept Videos
01:29Cytoskeletal Proteins in Bacteria
Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...
01:22Bacterial Cell Wall
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...
01:29Microbial Morphologies
Bacterial and archaeal cells exhibit remarkable diversity in shape and structure, critical in their adaptability and functionality. Among bacteria, the most commonly observed shapes include cocci and bacilli. Cocci are spherical and may exist singly or in groupings such as pairs (diplococci), chains (streptococci), clusters (staphylococci), or tetrads. Bacilli, in contrast, are rod-shaped and can also occur as single cells, in pairs, or chains, depending on their environmental and genetic...
01:18Outer Layers of the Cell Envelope
The outermost layers of prokaryotic cells play a critical role in their survival, virulence, and interaction with the environment. These layers, often composed of polysaccharides, polypeptides, or proteins, form protective and adhesive structures that vary in organization and function.Capsules and Slime LayersCapsules are highly organized, tightly bound layers that firmly attach to the bacterial cell wall. Capsules are usually made of polysaccharides, though some are made of polypeptides. These...
01:29Archaeal Cell Wall
Archaeal cell walls are structurally and compositionally distinct from their bacterial counterparts, lacking the characteristic peptidoglycan layer found in most bacteria. Instead, archaeal cell walls exhibit remarkable diversity, utilizing materials such as pseudomurein, polysaccharides, and proteins to construct their protective outer layers. This structural flexibility is closely tied to archaea's ecological adaptability.S-Layers: The Common Archaeal Cell WallThe S-layer is the most...
01:02Role of Microtubules in Cell Wall Deposition
Microtubules are small hollow tubes in eukaryotic cells. The cell wall microtubules are polymerized dimers of two globular proteins, α-tubulin and β-tubulin, two globular proteins. With a diameter of about 25 nm, microtubules are the widest components of the cytoskeleton. They help the cell resist compression and provide a track along which vesicles move through the cell or pull replicated chromosomes to opposite ends of a dividing cell. Microtubules go through quick cycles of disassembly and...