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- W2017371394 abstract "Mistic is an unusual membrane protein from Bacillus subtilis. It appears to fold and insert autonomously into a lipid bilayer and has been suggested as a tool that aids the targeting of eukaryotic membrane proteins to bacterial membranes. The NMR structure of Mistic in detergent (LDAO) micelles has revealed it to be a four α-helix bundle. From a structural perspective, Mistic does not resemble other membrane proteins. Its external surface is not very hydrophobic, and standard methods do not predict any of its helices to be in the transmembrane orientation. Molecular dynamics simulations (simulation times ∼30 ns) in water and in detergent micelles have been used to explore the conformational stability of Mistic as a function of its environment. In water, the protein is stable, exhibiting no significant change in fold on a 30 ns time scale. In contrast, in three simulations in detergent micelles, the partial unfolding of Mistic occurred, whereby the H4 helix drifted away from the H1−H3 core. This was due to the penetration of detergent molecules between H4 and the remainder of the protein. This is unlike the behavior of several other membrane proteins, both α-helix bundles and β-barrels, in comparable detergent micelle simulations. The unfolding of H4 from the H1−H3 core of Mistic could be partially reversed by a simulation in which the detergent molecules were removed, and the unfolded protein was simulated in water. These results suggest that Mistic may not be a stable integrated membrane protein but rather that it may undergo a conformational change upon interaction with a membrane or membrane-like environment." @default.
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- W2017371394 date "2006-07-07" @default.
- W2017371394 modified "2023-10-06" @default.
- W2017371394 title "MD Simulations of Mistic: Conformational Stability in Detergent Micelles and Water" @default.
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- W2017371394 doi "https://doi.org/10.1021/bi0608818" @default.
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