Bacterial Strategies For Chemotaxis Response

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BIOPHYSICS Copyright © 2020 Chemotaxis strategies of bacteria

Chemotaxis strategies of bacteria with multiple run modes Zahra Alirezaeizanjani, Robert Großmann, Veronika Pfeifer, Marius Hintsche, Carsten Beta* Bacterial chemotaxis a fundamental example of directional navigation in the living world is key to many bio-logical processes, including the spreading of bacterial infections.

Guidance mechanisms in bacteria and sperm Prof. Michael Eisenbach

strategies using chemotaxis of the bacteria Escherichia coli and Salmonella typhimurium as a model. Bacterial chemotaxis is a sophisticated system that integrates many different signals into a common output a change in the direction of flagellar rotation. The signal transduction in E. coli chemotaxis is between two supramolecular

Bacterial Chemotaxis in an Optical Trap

biphasic response may be evolutionarily conserved. This study also demonstrated that optical tweezers can be a useful tool for chemotaxis studies and should be applicable to other polarly flagellated bacteria. Citation: Altindal T, Chattopadhyay S, Wu X-L (2011) Bacterial Chemotaxis in an Optical Trap.


signal transduction strategies. One kind of chemotaxis is inde-pendent of the metabolism of the chemoeffector molecule, whereas metabolism of the signaling molecule is a prerequisite for the other kind of chemotaxis (2). The two signal transduc-tion strategies of chemotaxis that are relevant to this minire-

Bacterial toxins ( By HOZA, A.S )

response to leukocytosis-inducing factors from injured cells 2. Margination: neutrophils cling to walls of capillaries in inflamed area in response to called cell adhesion molecules (CAMs). 3. Diapedesis of neutrophils 4. Chemotaxis: inflammatory chemicals (chemotactic agent) promote positive chemotaxis of neutrophils.

Optimization based on bacterial chemotaxis - Evolutionary

Index Terms Bacterial chemotaxis, evolution strategies, sto-chastic optimization methods. I. The term taxis refers to the locomotory response of a cell to its environment. In a taxis, a

The Energetics and Scaling of Search Strategies in Bacteria

mately, bacterial response to any cue is a direct or indirect form of chemotaxis, since all bacteria must take up and use organic or inorganic monomers to live. While the molecular machinery of chemotaxis has been intensively investigated and has played a key role in understanding how external cues translate to internal biochemical pro-

The role of microbial motility and chemotaxis in symbiosis

behaviour is chemotaxis, that is, the ability to direct active movement towards or away from specific chemi-cal sources. Chemotaxis enables motile microorganisms to locate and colonize a symbiotic partner by homing in on specific signal molecules produced by the host. Whereas the pivotal role of chemotaxis in the onset and

Pseudomonas aeruginosa Biofilms: Host Response and Clinical

their chemotaxis (33). Interestingly, P. aeruginosa has the capability to respond to the presence of nearby neutrophils by upregulating rhamnolipid expression to form a shield that protects the biofilm bacterial community (35). Alternative bacterial strategies at evading neutrophil detection and killing have also been elucidated. Loss of

Swimming motility of a gut bacterial symbiont promotes

highlights that bacterial motility and the factors controlling the spatial organization of resident microbiota are potential targets for therapeutic manipulation of the gut microbiome. Results Loss of swimming motility or chemotaxis attenuates intestinal colonization and interbacterial competition

Chemotactic Factors in Cerebrospinal Fluid during Bacterial

apeutic strategies. Chemotaxis, directed migration of leukocyte subsets toward the CNS, is a complex process of which we have limited knowl-edge. First, leukocytes must adhere to endothelial cells, a pro-cess in which specific adhesion molecules (selectins) are in-volved, producing a rolling motion of leukocytes along the endothelium (81).

Journal of Microbiological Methods

chemotactic response toward skin m ucus compared to less virulent, genomovarIstrains.Thus,anincreasedunderstandingof thechemotactic response of F. columnare and the channel catfish mucus components involved may provide new insights into host pathogen relationships and novel control strategies.

The Effect of Reversals for a Stochastic Source-Seeking

Inspired by Bacterial Chemotaxis Noele Norris , Filippo Menolascina y, Emilio Frazzoli , and Roman Stocker Abstract Many species of bacteria are motile, but they use different random strategies to determine where to swim in response to chemical gradients. We extend past work describing a chemotactic E. coli cell as an ergodic, stochastic

How the Motility Pattern of Bacteria Affects Their Dispersal

response of the cells using macroscopic observations of bacteria moving in constant gradients or towards the point source of a chemical. The run-and-tumble motion of E. coli bacteria is probably the best-known example of bacterial swimming. E. coli has multiple flagella, which can rotate and propel the cell forward. Flagella

Chemotaxis microsimulation: On the gain in nutrient uptake

propel bacterial chemotaxis,12 and consequences for the chemotactic response.10,28,29 0 is the size of the initial bacterial population. Biasing strategies

Rapid Method for Analyzing Bacterial Behavioral Responses to

is similar to the classical Escherichia coli-type response to attractants (10). The response curve expressed in terms of 200 a)-QE:3 0-45-0 150 F 100-50 F 1o-5 10-4 1-3 10-2 Serine (M) FIG. 4. Concentration-response curve for serine. Videotaped imagesweresampled at 60s after the start ofobservation. Vertical bars represent the standard


Bacterial Motility Chemotaxis is the process by which bacteria sense particular molecules in their environment and alter their swimming patterns in response. In the simplest sense, chemotaxis causes bacteria to, in the aggregate, swim towards safer, more nutritive areas, and away from dangerous ones (Adler 1966). Bacterial movement, or motility, is

Bacterial Chemotaxis

Bacteral Chemotaxis The bacterial flagella are arranged into bundles which diverge into separate bundles when they drive clock wise (CW) and converge to a single bundle when they are rotating counter clockwise (CCW). The Bacteria thus has two states of motion (A) swimming in a straight line (v=14-30 m/sec, in average for 0.8s) and

Antonio Celani and Massimo Vergassola1

Bacterial strategies for chemotaxis response Antonio Celani and Massimo Vergassola1 Institut Pasteur, Genomes and Genetics Department, Unit Physics of Biological Systems, Centre National de la Recherche Scientifique Unité de Recherche Associée 2171, F-75015 Paris, France

EVOLUTION The Promise of Evolutionary Systems Biology

tem: the chemotaxis network. This network is well characterized in several model or-ganisms including Escherichia coli(2, 3), but we still cannot claim to have achieved a full understanding of bacterial chemotaxis, because response dynamics and network structure show clear differences between these model organisms and others (4, 5).

Physiological Genetic Responses Bacteria to Osmotic Stress

applies to bacterial and plant cells, which have rigid walls surrounding the cytoplasmic membrane. Thus, as water diffuses into these cells, the membranescan expand only as far as the interior side ofthe cell walls, and additional influx ofwaterresults in abuildupofpressurethat is exertedbythe cytoplasmic membrane on the walls. This pressure is the


for the study of bacterial motility and chemotaxis. Motility refers to the process by which an organism moves by itself, and Chemotaxis is the process by which micro-organisms look for nu-

Chemotaxis Inhibitory Protein of Staphylococcus aureus a

of staphylococcal virulence strategies and new means to combat S. aureus infections (3). An immediate host response toward bacterial infection is the migration of leukocytes from the circulation into the sites of infection. Numerous exogenously and endoge-nously produced leukocyte chemoattractants that initiate

Logarithmic Sensing in Escherichia coli Bacterial Chemotaxis

problem of bacterial logarithmic sensing, major develop-ments have occurred recently in both our ability to establish well-controlled spatial and temporal ligand profiles at the micrometer length scale for the studies of bacterial chemo-taxis at cellular level (6,7) and our understanding of the bacterial chemotaxis signaling pathway at the

s41467-019-09521-2 OPEN Bacterial chemotaxis in a microfluidic

uniform response to chemoattractants of cells within a population. Having a distribution of phenotypes can be beneficial for bacterial populations, for example, in bet-hedging and division-of-labor strategies, or community self-regulation24,25. Within the chemotaxis pathway of E. coli, one of the most

Michael Eisenbach Chemotaxis: Communication strategies from

Chemotaxis: Communication strategies from bacteria to humans Department of Biological Chemistry Michael Eisenbach 3923 4112 [email protected] Signal transduction in bacterial chemotaxis We explore signal transduction strategies using chemotaxis of the bacteria Escherichia coli and Salmonella typhimurium as a model.

Bacterial strategies for chemotaxis response

Bacterial strategies for chemotaxis response Antonio Celani and Massimo Vergassola1 Institut Pasteur, Genomes and Genetics Department, Unit Physics of Biological Systems, Centre National de la Recherche Scientifique Unité de Recherche Associée 2171, F-75015 Paris, France

Emergent properties of bacterial chemotaxis pathway

of bacterial chemotaxis pathway Colin and Sourjik 27 Box 1 Modeling the chemotaxis pathway Models d of the chemotaxispathway of E. coli aim at explaining the intracellular dynamics of the pathway response to chemical and other stimuli as well as cell behavior in gradientsof these stimuli r [16]. At the and the the pathway Chemotaxis pathway

A Circuit for Gradient Climbing in C. elegans Chemotaxis

response d AWA desensitization strategies to navigate to favorable conditions in natural environ- reminiscent of bacterial chemotaxis (Berg and Brown, 1972).

Response rescaling in bacterial chemotaxis

response of Escherichia coli to time-varying stimuli. PNAS 105:14855-14860. [8] Mesibov R, Ordal GW, Adler J (1973) The range of attractant concentrations for bacterial chemotaxis and the threshold and size of response over this range. Weber law and related phenomena. J Gen Physiol 62:203-22. Response rescaling in bacterial chemotaxis

Thermal Robustness: Lessons from Bacterial Chemotaxis

Escherichia coli chemotaxis pathway as model system [3], the authors present acomprehensive picture ofthe various strategies evolved by this system to compensate for the effect of temperature change on two key functional parameters: the steady state of the system output and the rate of adaptation to a constant stimulus. Like many flagellated

Insignificant Impact of Chemotactic Responses of Pseudomonas

metabolic activity, whereas the chemotaxis response has a negligible impact. This study would help to establish a suitable strategy to manage bacterial attachment.

Bacterial enhancement of contaminant bioavailability: effects

Figure 2.2: Schematic representing a possible evolution in the bacterial chemotactic response to environmental pollutants as a result bacterial pursuit for carbon and energy resources. Improved understanding of thisredacqui behavioral response of degradative bacteria can


tion via chemotaxis signaling. We demonstrate how communication enables the colony to develop complex patterns in response to adverse growth conditions. This self-organization of the colony, which can be achieved only via cooperative behavior of the bacteria, may be

Identification of Positive Chemotaxis in the Protozoan

environments (1 3). Many bacterial pathogens, in particular, rely on chemotaxis to move toward their desired site of infection (4 7). For protozoan pathogens, which typically must navigate through multiple hosts and a variety of different tissues in each host, chemotaxis has also been hypothesized to be necessary for pathogenesis and

Bacterial chemotaxis towards aromatic hydrocarbons Pseudomonas

tactic response towards toluene is independent of the metabolism of the chemoattractant. We used 36 different hydrocarbons, at a concentration of 1% (v/v), to assess the spectrum of attractants that give rise to the chemot­ axis phenotype. P. pulida DOT-T1E exhibited strong chemotaxis in response to 70% of the tested compounds

crossm - Home mBio

physiological relevance. The discovery of histamine chemotaxis in the human pathogen Pseudomonas aeruginosa provides insight into tactic movements that occur within the host. Since histamine is released in response to bacterial patho-gens, histamine chemotaxis may permit bacterial migration and accumulation at

Bacterial strategies for chemotaxis

Bacterial strategies for chemotaxis Antonio Celani Physics of biological systems Institut Pasteur response is designed to obtain a positive uptake rate in all

Response rescaling in bacterial chemotaxis

Response rescaling in bacterial chemotaxis Milena D. Lazovaa, Tanvir Ahmedb, Domenico Bellomoc,d,1, Roman Stockerb, and Thomas S. Shimizua,2 aFoundation for Fundamental Research on Matter Institute for Atomic and Molecular Physics (FOM Institute AMOLF), 1098 XG Amsterdam, The Netherlands;

Low‐temperature chemotaxis, halotaxis and chemohalotaxis by

Low-temperature chemotaxis, halotaxis and chemohalotaxis by the psychrophilic marine bacterium Colwellia psychrerythraea 34H G. M. Showalter* and J. W. Deming School of Oceanography, University of Washington, Seattle, WA, USA. Summary A variety of ecologically important processes are driven by bacterial motility and taxis, yet these basic