Hello,

I have done calculations using standard GROMOS 
43a1 and 53a6 parameters (GROMACS 3.3.3) for a 4-hydroxy-L-proline derivative 
(HYP), where the 
gamma-OH and the alpha-CO groups are trans to each other in the starting 
structure. However, over the course of MD the trans-configuration of these two 
substituents changes into a 
cis-configuration, which was not supposed to happen. Is there any way to avoid 
such isomerisation?

Abil 



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