I want to do an all-atom MD simulation without adding bias to a protein kinase. My starting conformation is DFG-in. How many nanoseconds of simulation is required, for the activation loop to change from DFG-in to DFG-out?
If I'm not wrong, it may take at least 1 millisecond. You can try with accelerated MD simulations or umbrella sampling if you are aware of the activation pathway.
I'm agree with Ramin. You should do enhance sampling like metadynamics/SMD/umbrella sampling etc. It's difficult to predict the time scale in classical simulation before doing it. You may get your desire results within nano seconds or microseconds.