Bacterial responses to osmotic challenges
TL;DR: In this paper, the authors describe how microbes respond to osmotic challenges in diverse, variable, and extreme natural environments, and how exposure to diverse environments is a hallmark of microbial life.
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Abstract: ### Microbes respond to osmotic challenges in diverse, variable, and extreme natural environments
Exposure to diverse environments is a hallmark of microbial life. Microbes are everywhere; collectively, microbes experience everything. They live inside and outside eukaryotic hosts, in soil, water,
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References
Analysis of Strains Lacking Known Osmolyte Accumulation Mechanisms Reveals Contributions of Osmolytes and Transporters to Protection against Abiotic Stress
Lindsay Murdock,Tangi Burke,Chelsea Coumoundouros,Doreen E. Culham,Charles E. Deutch,Charles E. Deutch,James J. Ellinger,Craig H. Kerr,Samantha M. Plater,Eric S.K. To,Geordie Wright,Janet M. Wood +11 more
TL;DR: The effectiveness of glycine betaine, TMAO, and proline as osmoprotectants correlated with their preferential exclusion from protein surfaces, not with their propensity to prevent protein denaturation, and their effectiveness as stress protectants correlation with their ability to rehydrate the cytoplasm.
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Analysis of putative protomer crosstalk in the trimeric transporter BetP: The heterotrimer approach.
TL;DR: Experimental evidence is provided for the absence of functionally significant conformational crosstalk between the protomers on the level of both transport and regulation for oligomeric transport proteins in general and BetP in particular.
12
Ion Specificity and Ionic Strength Dependence of the Osmoregulatory ABC Transporter OpuA
N. A. B. Nik Mahmood,Esther Biemans-Oldehinkel,Jason S. Patzlaff,Geesina Schuurman-Wolters,Berend Poolman +4 more
TL;DR: The data lend new support for the contention that the CBS module in OpuA constitutes the ionic strength sensor whose activity is modulated by the C-terminal anionic tail.
Biophysical compensation mechanisms buffering E. coli protein–nucleic acid interactions against changing environments
TL;DR: Biophysical effects resulting from changes in the amount of cytoplasmic water and in the concentrations of other cytopalasmic solutes appear to compensate for the effects of changes in cytopLasmic K+ concentration and thereby maintain protein-nucleic acid equilibria and kinetics in the range required for in vivo function.
Large changes in cytoplasmic biopolymer concentration with osmolality indicate that macromolecular crowding may regulate protein-DNA interactions and growth rate in osmotically stressed Escherichia coli K-12.
Scott Cayley,M. Thomas Record +1 more
TL;DR: It is proposed that crowding increases with increasing growth osmolality, which in turn buffers the binding of proteins to nucleic acids against changes in cytoplasmic K+ concentration and is a determinant of growth rate of osmotically stressed cells.