[gmx-users] grompp

Mark Abraham Mark.Abraham at anu.edu.au
Tue Oct 24 17:29:53 CEST 2006

Michal Walczak wrote:

> I only used the same *.mdp file but *.top files where different for
> protein and for 3 aa  peptide, so it seems that I should use different
> *.mdp file. Am I wrong? How could I obtain that *.mdp input for 3 aa
> peptide?

Here's an exercise. Write down what you think the general description of 
the information in a .top file is, and the general description of the 
information in an .mdp file is. Look at the contents of working .mdp and 
.top files if you need a clue - if you don't have working examples, do 
some tutorial exercises on the gromacs webpage. Read the manual for details.

By now, you'll have started to work out the answer to your above questions.

Rough answers below (scroll down)

.mdp file : values for parameters that are required to select and 
properly use different algorithms in an MD simulation, and control of 
output from an MD simulation
.top file : topology (i.e. bond connectivity) for a particular chemical 

Hence it is clear than an .mdp file has more chance of being 
transferable across systems than a .top file.


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