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- W2037553110 abstract "Stochastic expression of genes produces heterogeneity in clonal populations of bacteria grown under identical conditions. We analyze the stochastic reaction-diffusion dynamics of selected biochemical pathways in Escherichia coli to show how individual cells vary expression of a set of genes in response to an environmental signal. The whole cells simulated under in vivo conditions include ribosomes, DNA, and large protein complexes, which take up 30-50% of the cell volume and are placed according to data from cryoelectron tomography and proteomics. using GPU processors, we simulate the dynamics for an entire cell cycle and compare the mRNA/protein distributions to those observed in single molecule experiments. We show how such distributions can be used to derive additional kinetic parameters and integrate effects of cell-to-cell variations into flux balance analysis of genome scale models of metabolic networks. The distribution of growth rates calculated for a colony of bacteria are analyzed and correlated to changes in fluxes through the metabolic network. With the availability of high-performance computing, simulations are poised to allow integration of data from structural, single-molecule, and biochemical studies into coherent computational models of cells and cellular processes. Here the calculations are performed with our Lattice Microbes software. Animation of reaction trajectories involving millions of particles is facilitated using a plugin to the VMD visualization and analysis program. “Noise contributions in an inducible genetic switch: A whole cell simulation study”, E. Roberts, A. Magis, J. Ortiz, W. Baumeister, and Z. Luthey-Schulten, Plos Comput. Biol. 7(3), e1002010 March (2011). “Determining the stability of genetic switches: Explicitly accounting for mRNA noise” M. Assaf, E. Roberts, and Z. Luthey- Schulten, Phys.Rev.Lett. 24, 248102, (2011). “Lattice Microbes: high-performance stochastic simulation method for the reaction-diffusion master equation”, E. Roberts, J. Stone, Z. Luthey-Schulten, J. Comp. Chem, (2012, in press)." @default.
- W2037553110 created "2016-06-24" @default.
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- W2037553110 date "2013-01-01" @default.
- W2037553110 modified "2023-09-27" @default.
- W2037553110 title "Stochastic Simulations of Cellular Processes in Bacteria" @default.
- W2037553110 doi "https://doi.org/10.1016/j.bpj.2012.11.2149" @default.
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