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• W2323191527 abstract "Dynein light chain LC8 is a highly conserved, dimeric protein involved in a variety of essential cellular events. Phosphorylation at Ser88 was found to promote mammalian cell survival and regulate the dimer to monomer transition at physiological pH. Combining molecular dynamics (MD) simulation and free energy calculation methods, we explored the atomistic mechanism of the phosphorylation-induced dimer dissociation. The MD simulation revealed that phosphorylation/phosphomimetic mutation at Ser88 opens an entrance into the dimer interface for water molecules, which disturb the hydrogen bond network around His55 and is expected to raise the pK(a) value and protonation ratio of His55 as well. The free energy calculations showed that the S88E mutation destabilized the dimer by 6.6 kcal/mol, in good agreement with the experimental value of 8.1 kcal/mol. The calculated destabilization upon phosphorylation is 50.8 kcal/mol, showing that phosphorylation definitely prevents dimer formation under physiological conditions. Further analysis of the calculated free energy changes demonstrated that the electrostatic contribution dominates the impact of phosphorylation on dimer dissociation." @default.
• W2323191527 created "2016-06-24" @default.
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• W2323191527 date "2010-11-09" @default.
• W2323191527 modified "2023-09-27" @default.
• W2323191527 title "Mechanism of Ser88 Phosphorylation-Induced Dimer Dissociation in Dynein Light Chain LC8" @default.
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• W2323191527 doi "https://doi.org/10.1021/jp1048869" @default.
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