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• W2018694248 abstract "The cytosol is the major environment in all bacterial cells. The true physical and dynamical nature of the cytosol solution is not fully understood and here a modeling approach is applied. Using recent and detailed data on metabolite concentrations, we have created a molecular mechanical model of the prokaryotic cytosol environment of Escherichia coli, containing proteins, metabolites and monatomic ions. We use 200 ns molecular dynamics simulations to compute diffusion rates, the extent of contact between molecules and dielectric constants. Large metabolites spend ∼80% of their time in contact with other molecules while small metabolites vary with some only spending 20% of time in contact. Large non-covalently interacting metabolite structures mediated by hydrogen-bonds, ionic and π stacking interactions are common and often associate with proteins. Mg(2+) ions were prominent in NIMS and almost absent free in solution. Κ(+) is generally not involved in NIMSs and populates the solvent fairly uniformly, hence its important role as an osmolyte. In simulations containing ubiquitin, to represent a protein component, metabolite diffusion was reduced owing to long lasting protein-metabolite interactions. Hence, it is likely that with larger proteins metabolites would diffuse even more slowly. The dielectric constant of these simulations was found to differ from that of pure water only through a large contribution from ubiquitin as metabolite and monatomic ion effects cancel. These findings suggest regions of influence specific to particular proteins affecting metabolite diffusion and electrostatics. Also some proteins may have a higher propensity for associations with metabolites owing to their larger electrostatic fields. We hope that future studies may be able to accurately predict how binding interactions differ in the cytosol relative to dilute aqueous solution." @default.
• W2018694248 created "2016-06-24" @default.
• W2018694248 creator A5001224002 @default.
• W2018694248 creator A5060162562 @default.
• W2018694248 creator A5060698638 @default.
• W2018694248 date "2011-06-09" @default.
• W2018694248 modified "2023-10-18" @default.
• W2018694248 title "A New View of the Bacterial Cytosol Environment" @default.
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• W2018694248 doi "https://doi.org/10.1371/journal.pcbi.1002066" @default.
• W2018694248 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3111478" @default.
• W2018694248 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21695225" @default.
• W2018694248 hasPublicationYear "2011" @default.
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