[gmx-users] Force Field for amino acid and peptide
alexanderwien2k at gmail.com
Fri May 27 12:55:02 CEST 2016
Thanks for your response.
What does "being compatible" mean here, please?
Actually, the FF of the surface (meanly \sigma and \epsilon in L-J) was
harvested via a series of parametrization of some parameters with the
quantum calculation of the same parameters. So, how can I find the most
compatible FF of the peptide with this surface then?
I just chose "OPLS-AA" force field for peptides because the [ defaults ]
sections (in topol.top) for "OPLS-AA" FF (among the FF provided in Gromacs)
was quite close to the [ defaults ] section of my simulations for the
surface. But, I really do not know how reliable this is!?
I could not see the CVFF force field in the suggested list of FF in "gmx
pdb2gro peptide.pdb ...", so, I was wondering how can use CVFF force field
for peptides in this simulation?
On Thu, May 26, 2016 at 3:03 AM, Justin Lemkul <jalemkul at vt.edu> wrote:
> On 5/25/16 11:05 AM, Alexander Alexander wrote:
>> Dear Gromacs user,
>> I am going to simulate the binding free energy of some amino acid to a
>> metal surface in aqueous solution and also peptide adsorption behavior
>> this surface.
>> I know the force field of the surface as well as the better type of water
>> for such a work, but I do not know which type of Force Filed could be the
>> better choice for the peptide (amino acids) for this simulation, so I
>> be so appreciated if anybody could address me to a better choice of
>> (amino acid) Force Filed for such a goal?
> One that is compatible with the force field of the surface. A force field
> is a self-consistent entity. In general, you can't mix and match different
> parameter sets from different sources, unless those parameter sets have a
> common origin or shared method of parametrization. So your choice here for
> treatment of the protein really isn't a free one, it's not about being the
> "better choice" for the system; there can be only one answer, if it
> exists. Maybe there is no protein force field compatible with whatever the
> surface is.
> Justin A. Lemkul, Ph.D.
> Ruth L. Kirschstein NRSA Postdoctoral Fellow
> Department of Pharmaceutical Sciences
> School of Pharmacy
> Health Sciences Facility II, Room 629
> University of Maryland, Baltimore
> 20 Penn St.
> Baltimore, MD 21201
> jalemkul at outerbanks.umaryland.edu | (410) 706-7441
> Gromacs Users mailing list
> * Please search the archive at
> http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before
> * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists
> * For (un)subscribe requests visit
> https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or
> send a mail to gmx-users-request at gromacs.org.
More information about the gromacs.org_gmx-users