Related Experiment Video
Updated: Jan 3, 2026
04:44
Visualizing Bacterial Motility Based on a Color Reaction
Published on: February 15, 2022
4.9K
Mechanisms for bacterial gliding motility on soft substrates
Joël Tchoufag1, Pushpita Ghosh2, Connor B Pogue3
1Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720.
Summary
This study reveals the physics of bacterial gliding motility, a mysterious movement without external appendages. A new model explains gliding speed variations based on substrate stiffness, uncovering two distinct propulsion mechanisms.
Area of Science:
- Microbiology
- Biophysics
- Soft Matter Physics
Background:
- Gliding motility in prokaryotes, lacking external appendages, remains poorly understood.
- Myxobacteria serve as a model organism for studying this unique form of bacterial locomotion.
Purpose of the Study:
- To elucidate the physical principles governing bacterial gliding motility.
- To develop a theoretical model predicting gliding speed based on substrate stiffness.
Main Methods:
- Developed an elasto-capillary-hydrodynamic theoretical model.
- Defined gliding as horizontal translation under zero net force.
- Conducted experiments with isolated myxobacteria on agar substrates of varying stiffness.
Main Results:
- Identified a two-regime behavior in gliding speed correlated with substrate stiffness.
- Demonstrated distinct thrust mechanisms for mildly soft (shape deformation) and very soft (capillary effects) substrates.
- Experimental results showed strong agreement with the theoretical model's predictions.
Conclusions:
- The study provides a theoretical framework for understanding bacterial gliding motility.
- Elasto-capillary-hydrodynamic interactions are crucial for bacterial propulsion on soft substrates.
- Findings advance the understanding of friction and substrate-mediated interactions in microbial communities.
Related Concept Videos
01:18Flagella and Motility in Bacteria
1.8K
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...
1.8K
01:28Fimbriae, Pili, and Axial Filaments
1.4K
Fimbriae and pili are specialized bacterial surface structures that play pivotal roles in adhesion, genetic exchange, and motility. Composed primarily of pilin protein, these hairlike appendages are crucial for bacterial survival and pathogenicity in various environments.Fimbriae: Adhesion and PathogenicityFimbriae are fine, filamentous structures measuring 2–10 nanometers in diameter and are densely distributed on the bacterial cell surface. They facilitate bacterial adhesion to abiotic...
1.4K
01:10Intracellular Movement of Viruses and Bacteria
3.4K
Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a...
3.4K
01:31Mechanism of Lamellipodia Formation
3.5K
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
3.5K
01:39Mechanism of Filopodia Formation
3.0K
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
3.0K
01:13Actin Polymerization and Cell Motility
6.3K
Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
6.3K