On 8/21/13 4:00 PM, MUSYOKA THOMMAS wrote:
Dear users,
I am new to GROMACS and i have just been practising with several tutorials.
I am trying to do a molecular dynamics simulation of cysteine proteases an
example falcipain-2 (PDBID=2OUL) and got several issues to pose
1) looking at the structure it has water molecules - do i get rid of the
water molecules before starting the whole process
If they are functionally relevant, leave them alone. If not, it doesn't really
matter.
2) when i generate the topology file, i get several .itp files
corresponding to each chain. Which one do i use for subsequent steps?
All of them. The .top written by pdb2gmx handles everything for you.
3) How do i handle the presence of disulphide bonds and salt bridges in my
MD simulation process?
Disulfide bonds either exist or they don't, as defined by pdb2gmx. You can
control which ones exist with the -ss option. I don't know what you want to do
about salt bridges; there is no specific topological definition for them and
they will likely break and form during the simulation according to how favorable
their interactions are.
-Justin
--
==================================================
Justin A. Lemkul, Ph.D.
Postdoctoral Fellow
Department of Pharmaceutical Sciences
School of Pharmacy
Health Sciences Facility II, Room 601
University of Maryland, Baltimore
20 Penn St.
Baltimore, MD 21201
jalem...@outerbanks.umaryland.edu | (410) 706-7441
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