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In vivo measurement by FRET of pathway activity in bacterial chemotaxis.
Sourjik V, Vaknin A, Shimizu TS, Berg HC. Sourjik V, et al. Methods Enzymol. 2007;423:365-91. doi: 10.1016/S0076-6879(07)23017-4. Methods Enzymol. 2007. PMID: 17609141
The two-component pathway in Escherichia coli chemotaxis has become a paradigm for bacterial signal processing. Genetics and biochemistry of the pathway as well as physiological responses have been studied in detail. ...Here, we describe quantitative applications of these …
The two-component pathway in Escherichia coli chemotaxis has become a paradigm for bacterial signal processing. Genetics and biochemi …
Multiple sources of slow activity fluctuations in a bacterial chemosensory network.
Colin R, Rosazza C, Vaknin A, Sourjik V. Colin R, et al. Among authors: vaknin a. Elife. 2017 Dec 12;6:e26796. doi: 10.7554/eLife.26796. Elife. 2017. PMID: 29231168 Free PMC article.
Networked Chemoreceptors Benefit Bacterial Chemotaxis Performance.
Frank V, Piñas GE, Cohen H, Parkinson JS, Vaknin A. Frank V, et al. Among authors: vaknin a. mBio. 2016 Dec 20;7(6):e01824-16. doi: 10.1128/mBio.01824-16. mBio. 2016. PMID: 27999161 Free PMC article.
The source of high signal cooperativity in bacterial chemosensory arrays.
Piñas GE, Frank V, Vaknin A, Parkinson JS. Piñas GE, et al. Among authors: vaknin a. Proc Natl Acad Sci U S A. 2016 Mar 22;113(12):3335-40. doi: 10.1073/pnas.1600216113. Epub 2016 Mar 7. Proc Natl Acad Sci U S A. 2016. PMID: 26951681 Free PMC article.
The sensory histidine kinases TorS and EvgS tend to form clusters in Escherichia coli cells.
Sommer E, Koler M, Frank V, Sourjik V, Vaknin A. Sommer E, et al. PLoS One. 2013 Oct 11;8(10):e77708. doi: 10.1371/journal.pone.0077708. eCollection 2013. PLoS One. 2013. PMID: 24147062 Free PMC article.
These sensors clustered even when expressed at a level of a few hundred copies per cell. Moreover, the mYFP-tagged response regulator TorR showed clear TorS-dependent clustering, indicating that untagged TorS sensors also tend to form clusters. ...Overall, these fin …
These sensors clustered even when expressed at a level of a few hundred copies per cell. Moreover, the mYFP-tagged response re …
Physical responses of bacterial chemoreceptors.
Vaknin A, Berg HC. Vaknin A, et al. J Mol Biol. 2007 Mar 9;366(5):1416-23. doi: 10.1016/j.jmb.2006.12.024. Epub 2006 Dec 15. J Mol Biol. 2007. PMID: 17217957 Free PMC article.
Chemoreceptors of the bacterium Escherichia coli are thought to form trimers of homodimers that undergo conformational changes upon ligand binding and thereby signal a cytoplasmic kinase. ...These changes were traced to changes in energy transfer between fluorophores on di …
Chemoreceptors of the bacterium Escherichia coli are thought to form trimers of homodimers that undergo conformational changes upon ligand b …
Single-cell FRET imaging of phosphatase activity in the Escherichia coli chemotaxis system.
Vaknin A, Berg HC. Vaknin A, et al. Proc Natl Acad Sci U S A. 2004 Dec 7;101(49):17072-7. doi: 10.1073/pnas.0407812101. Epub 2004 Nov 29. Proc Natl Acad Sci U S A. 2004. PMID: 15569922 Free PMC article.
Two-component signaling systems, in which a receptor-coupled kinase is used to control the phosphorylation level of a response regulator, are commonly used in bacteria to sense their environment. ...Evidently, this design enables a more rapid and spatially un …
Two-component signaling systems, in which a receptor-coupled kinase is used to control the phosphorylation level of a response …
Osmotic stress mechanically perturbs chemoreceptors in Escherichia coli.
Vaknin A, Berg HC. Vaknin A, et al. Proc Natl Acad Sci U S A. 2006 Jan 17;103(3):592-6. doi: 10.1073/pnas.0510047103. Epub 2006 Jan 6. Proc Natl Acad Sci U S A. 2006. PMID: 16407109 Free PMC article.
Two-component signaling systems play a major role in the long-term adaptation of microorganisms to changes in osmolarity, but how osmoreceptors work is not well understood. ...
Two-component signaling systems play a major role in the long-term adaptation of microorganisms to changes in osmolarity, but how osm …
The physical and functional thermal sensitivity of bacterial chemoreceptors.
Frank V, Koler M, Furst S, Vaknin A. Frank V, et al. J Mol Biol. 2011 Aug 19;411(3):554-66. doi: 10.1016/j.jmb.2011.06.006. Epub 2011 Jun 21. J Mol Biol. 2011. PMID: 21718703
We reveal a sharp modulation in the conformation of unclustered and clustered receptor trimers and, consequently, in kinase activity output. These modulations occurred at a characteristic temperature that depended on clustering and were lower for receptors at lower …
We reveal a sharp modulation in the conformation of unclustered and clustered receptor trimers and, consequently, in kinase activity …
Prolonged stimuli alter the bacterial chemosensory clusters.
Frank V, Vaknin A. Frank V, et al. Mol Microbiol. 2013 May;88(3):634-44. doi: 10.1111/mmi.12215. Epub 2013 Apr 14. Mol Microbiol. 2013. PMID: 23551504
We find that when a stimulus is applied, the packing of the receptors slowly decreases and that the process reverses when the stimulus is removed. Consistent with these physical changes we find that the effective cooperativity of the kinase response slowly evolves in the p …
We find that when a stimulus is applied, the packing of the receptors slowly decreases and that the process reverses when the stimulu …
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