C Johnson wrote:
If you're proceeding blindly, then you're likely going to frustrate yourself to no end. There is literature relevant to what you're doing - pulling on peptides/proteins to unfold them is something that's been done. So you should have some methodological precedent.

"Non-Protein" is a default group that should have been written to the .ndx file by make_ndx. The only reason I can see for this error to come up is if you've removed it from the pull.ndx file. If you're using my .mdp file, then Non-Protein is a temperature coupling group.

-Justin

I know there is literature relevant but is there any that explains how to do it in Gromacs?

I don't know. All I implied was that some of the mystery can be taken out of the process. A good Methods section can be translated to the parameters needed by Gromacs as input. Usually "how-to" material is reserved for tutorials, not the literature.

-Justin

--
========================================

Justin A. Lemkul
Ph.D. Candidate
ICTAS Doctoral Scholar
MILES-IGERT Trainee
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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