Conformation Dynamics of the Intrinsically Disordered Protein c-Myb with the Force Field.

The intrinsically disordered protein c-Myb plays a critical role in cellular proliferation and differentiation. Loss of c- function results in embryonic lethality due to failure of fetal hepatic hematopoiesis. The conformation dynamics of the intrinsically disordered c-Myb are still unknown. Here, molecular dynamics (MD) simulations with the intrinsically disordered protein force field were used to study the conformation dynamics. In comparison with , can reproduce more diverse disordered conformers of c-Myb. The predicted secondary chemical shift under is more close to that of experiment data than that under . Therefore, can sample native molten globule, native pre-molten globule and native coil conformers for c-Myb. These results are consistent with those of other intrinsically disordered proteins. Kinetic analysis of MD simulations shows that c-Myb folds a two-state process and indicates that c-Myb folds in the order of tertiary folding and helical folding. The folding nucleus of KEL plays an essential role in stabilizing the folding state with dynamic correlation networks. The influences of solvent models for TIP3P, TIP4P-EW and TIP5P were also investigated and it was found that TIP3P and are the best combination to research the conformer sampling of c-Myb. These results reveal the conformation dynamics of c-Myb and confirm that the force field can be used to research the relationship between structure and function of other intrinsically disordered proteins.