نتایج جستجو برای: flagellar wave

تعداد نتایج: 223614  

2011
Heather D. Kamp Darren E. Higgins

Facultative bacterial pathogens must adapt to multiple stimuli to persist in the environment or establish infection within a host. Temperature is often utilized as a signal to control expression of virulence genes necessary for infection or genes required for persistence in the environment. However, very little is known about the molecular mechanisms that allow bacteria to adapt and respond to ...

Journal: :Journal of bacteriology 1998
C D Mohr J K MacKichan L Shapiro

The ordered assembly of the Caulobacter crescentus flagellum is accomplished in part through the organization of the flagellar structural genes in a regulatory hierarchy of four classes. Class II genes are the earliest to be expressed and are activated at a specific time in the cell cycle by the CtrA response regulator. In order to identify gene products required for early events in flagellar a...

2013
Caitlin A Brennan Mark J Mandel Mattias C Gyllborg Krista A Thomasgard Edward G Ruby

Bacterial flagellar motility is a complex cellular behavior required for the colonization of the light-emitting organ of the Hawaiian bobtail squid, Euprymna scolopes, by the beneficial bioluminescent symbiont Vibrio fischeri. We characterized the basis of this behavior by performing (i) a forward genetic screen to identify mutants defective in soft-agar motility, as well as (ii) a transcriptio...

Journal: :The Journal of experimental biology 1969
C A Miles M E Holwill

Although the random nature of the movement of some plant spermatozoa has been described (Wilkie, 1954; Brokaw, 1959) and the influences of concentration and voltage gradients on the movement have been discussed (Pfeffer, 1884; Brokaw, 1957, 1958 a, b, 1959), no account of the flagellar movement of this type of 01 ganism has been given. Two possible mechanisms which could be responsible for the ...

Journal: :Current Biology 2000
Shahid Khan Daniel Pierce Ronald D Vale

The chemotaxis signal protein CheY of enteric bacteria shuttles between transmembrane methyl-accepting chemotaxis protein (MCP) receptor complexes and flagellar basal bodies [1]. The basal body C-rings, composed of the FliM, FliG and FliN proteins, form the rotor of the flagellar motor [2]. Phosphorylated CheY binds to isolated FliM [3] and may also interact with FliG [4], but its binding to ba...

Journal: :The Journal of Cell Biology 1984
R A Segal B Huang Z Ramanis D J Luck

Mutations at three independent loci in Chlamydomonas reinhardtii result in a striking alteration of cell motility. Mutant cells representing the three mbo loci move backwards only, propelled by a symmetrical "flagellar" type of bending pattern. The characteristic asymmetric "ciliary" type of flagellar bend pattern responsible for forward movement that predominates in wild-type cells is seldom s...

2013
Lynne S Cairns Victoria L Marlow Emma Bissett Adam Ostrowski Nicola R Stanley-Wall

In the natural environment bacteria predominantly live adhered to a surface as part of a biofilm. While many of the components needed for biofilm assembly are known, the mechanism by which microbes sense and respond to contact with a surface is poorly understood. Bacillus subtilis is a Gram-positive model for biofilm formation. The DegS-DegU two-component system controls several multicellular b...

Journal: :Journal of theoretical biology 2014
Julie Simons Sarah Olson Ricardo Cortez Lisa Fauci

Hyperactivation in mammalian sperm is characterized by a high-amplitude, asymmetric flagellar waveform. A mechanical advantage of this hyperactivated waveform has been hypothesized to be the promotion of flagellar detachment from oviductal epithelium. In order to investigate the dynamics of a free-swimming sperm׳s binding and escaping from a surface, we present an integrative model that couples...

Journal: :Journal of bacteriology 2005
Rachel E Muir James W Gober

In the Caulobacter crescentus predivisional cell, class III and IV flagellar genes, encoding the extracytoplasmic components of the flagellum, are transcribed in the nascent swarmer compartment. This asymmetric expression pattern is attributable to the compartmentalized activity of the sigma54-dependent transcriptional activator FlbD. Additionally, these temporally transcribed flagellar promote...

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