I would recommend reading lots of tutorial material and the Gromacs manual, especially Chapter 5. There are also numerous posts from Chris Stiles that contain a link to a tutorial he set up a while back for doing CNT simulations.

The main point is that you need to generate a topology that calls parameters from an existing force field, not modify a force field or structure.

-Justin

[EMAIL PROTECTED] wrote:
I'm new to gromacs and the past week or so I've been digging through the
archives so that I can simulate a carbon nanotube. I've been able find
coordinates for the carbon nanotube as well as the parameters for the
force field. My question is:

Do I define the parameters in the force field file or can I do it in pdb
file?

I'm asking because I'm unable to change the force field file, so if I
could just define the carbon nano tube residue in the pdb file that would
help me out a lot.

Thanks,

-John
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--
========================================

Justin A. Lemkul
Graduate Research Assistant
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

========================================

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