Re: [gmx-users] parameters problem

2014-03-11 Thread Nidhi Katyal
Thanks Mark. Yes, my ligand.itp indeed has both [atomtypes] entry as well as [molecule] entry. I have followed the following procedure to #include while creating my first molecule: Run pdb2gmx command. Added #include ligand.itp after #include charmm27.ff/forcefield.itp but before [ moleculetype ]

Re: [gmx-users] parameters problem

2014-03-10 Thread Justin Lemkul
On 3/10/14, 2:45 AM, Nidhi Katyal wrote: Thank you Mark and Justin. Now, I have carried out simulations using PME electrostatics and using all other parameters (except gromos 96 43a1 ff used) as suggested in http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin/gmx-tutorials/lysozyme/ The

Re: [gmx-users] parameters problem

2014-03-10 Thread Nidhi Katyal
To test swiss param parameters, I have generated *.pdb and *.itp files from it. In the genbox command, I have used -ci *.pdb -nmol 2. I have included *.itp in the topology as: ; Include Position restraint file ;#ifdef POSRES ;#include posre.itp ;#endif ;Include ligand topology #include

Re: [gmx-users] parameters problem

2014-03-10 Thread Mark Abraham
Probably you will see that your ligand.itp has an [atomtypes] entry as well as a [molecule] entry, and the former cannot follow any instance of the latter. Such an .itp file must be #included to create the first molecule. You have your protein [molecule] above the #include ligand.itp at the

[gmx-users] parameters problem

2014-02-17 Thread Nidhi Katyal
Dear all I am trying to simulate a protein in 3 steps: energy minimization (using em.mdp), position restraints (using pr.mdp) and final production run by NPT ensemble (using full.mdp) at 300K At this temperature, it is known by previous literature survey that protein keeps its secondary

Re: [gmx-users] parameters problem

2014-02-17 Thread Mark Abraham
Seems like you're using cut-off electrostatics, which would be a good way of picking lottery numbers, and that's about all. Mark On Mon, Feb 17, 2014 at 10:16 AM, Nidhi Katyal nidhikatyal1...@gmail.comwrote: Dear all I am trying to simulate a protein in 3 steps: energy minimization (using

Re: [gmx-users] parameters problem

2014-02-17 Thread Justin Lemkul
On 2/17/14, 4:16 AM, Nidhi Katyal wrote: Dear all I am trying to simulate a protein in 3 steps: energy minimization (using em.mdp), position restraints (using pr.mdp) and final production run by NPT ensemble (using full.mdp) at 300K At this temperature, it is known by previous literature