Re: [gmx-users] Re: DNA simulations

2012-07-09 Thread Justin A. Lemkul
On 7/9/12 4:07 PM, SatyaK wrote: Hello, I followed below steps using VMD and GROMACS but something went wrong in using GROMACS which I am not able to figure out. Appreciate your help. 1. editconf -f initialfile.pdb -o initialfile.gro -d 0.2 2. VMD: within 5 of nucleic

Re: [gmx-users] Re: DNA simulations

2012-07-05 Thread Mark Abraham
On 07/05/2012 01:04 PM, SatyaK wrote: Thanks once again Mark. I am trying to figure out things. Basically, I am using ReaxFF for my simulations. Has that been ported to GROMACS? If not, you have that issue to consider first. The basic problem I want to address is, to place OH radicals

Re: [gmx-users] Re: DNA simulations

2012-07-05 Thread Tsjerk Wassenaar
Hi Satya, You can use trjorder to rearrange solvent molecules in your structure file, according to distance. Then you can replace the first x solvent molecules by hydroxyl. Actually you only need to remove a hydrogen atom per water... Hope it helps, Tsjerk On Thu, Jul 5, 2012 at 5:04 AM,

Re: [gmx-users] Re: DNA simulations

2012-07-05 Thread Tsjerk Wassenaar
Uhmm, you remove particles, modify molecule types, and wonder whether there is continuity in the trajectories? Ah well, let's say you were to do a simulation and at some point t you suddenly have some hydrogen atoms that have lost all interaction with the system, and on top of that have the

Re: [gmx-users] Re: DNA simulations

2012-07-04 Thread Mark Abraham
On 5/07/2012 12:28 AM, SatyaK wrote: Thanks Mark for your response. These are steps I followed to construct DNA+Water molecules. editconf -f A.pdb -o A.gro -d 0.3 genbox -cp A.gro -cs -nice -20 -o A_water.gro That's not going to achieve your objective. I gave you a