On 8/20/14, 12:56 PM, pragna lakshmi wrote:
Thank you Mark for ur reply.
In the generated POPC.top from POPC.pdb and POPC.psf using VMD, the charges
have become to zero. Here are few lines of my POPC.top
[ atomtypes ]
; name bond_type mass charge ptype sigma epsilon
C1 C 1.0 0.0 A 0.0 0.0
C11 C 1.0 0.0 A 0.0 0.0
C12 C 1.0 0.0 A 0.0 0.0
C13 C 1.0 0.0 A 0.0 0.0
[ atoms ]
; nr type resnr residue atom cgnr charge mass
1 N 1 POPC N 1 0.0000 14.0070
2 C11 1 POPC C11 2 0.0000 12.0110
3 C12 1 POPC C12 2 0.0000 12.0110
4 C13 1 POPC C13 3 0.0000 12.0110
My question is whether this could be the reason for not having the charges
over the atoms.
If it is so, could you please suggest me the proper way of getting
parameters for POPC (charmm36 ff).
The proper parameters are published and are included in the .rtp file for
CHARMM36 that our lab produced. There is no reason to run anything through VMD;
it looks like it produces a shell of a topology that is totally nonfunctional.
-Justin
--
==================================================
Justin A. Lemkul, Ph.D.
Ruth L. Kirschstein NRSA 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
http://mackerell.umaryland.edu/~jalemkul
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