It also depends on what you meen by 'stable'. If it refers to lowest potential energy, then you can just find the minimum from the edr-file. Such a conformation may not make any chemical sense though. Could you be more precise?

/Erik

Erik Marklund skrev:
Hi,

I guess you want to compare the relevant free energies for the ensemble in question. There are plenty of free energy methods around, most of them fairly complicated. If you sample conformational space enough by brute force simulations, you can get the relative free energies for any two states from how often they appear in the trajectory. Now, go and brush up your statistical mechanics and thermodynamics!

/Erik

nur avneet skrev:


    Dear All
I have run different conformations of a polypeptide in spc water for 1ns, keeping the box size, volume and no. of water molecules same.
    Can i compare the enrgies of the different conformations after
    simulation and on its basis say which one of them is stable.
    also, to see the conformation in its most stable form can i take
    that time point when the energy was minimum?
         regards
    nur


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Erik Marklund, PhD student
Laboratory of Molecular Biophysics,
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