[gmx-users] Angle restraint of a peptide

2016-06-07 Thread Khuong Truong Gia
Dear all, I setup a simulation system that contains a peptide and membrane. The peptide is in water and I want to restraint the peptide to make it parallel with the surface of the membrane. How can I achieve this goal? If the first problem has solutions, then I have the second question is that if

Re: [gmx-users] Checking PMF convergenece using WHAM

2016-05-17 Thread Khuong Truong Gia
http://pubs.acs.org/doi/abs/10.1021/jp9110794 > > Regards, > > > > On 17 May 2016 at 01:59, Khuong Truong Gia <khuon...@gmail.com> wrote: > > > Dear all, > > > > I need your help about how to check the PMF convergence. Can you guys > show > >

Re: [gmx-users] Binding of a drug to a lipid bilayer using umbrella sampling method

2016-03-29 Thread Khuong Truong Gia
Dear Justin, I got it. Thank you very much for your kindly reply. Best regards, Khuong On Tue, Mar 29, 2016 at 6:56 PM, Justin Lemkul <jalem...@vt.edu> wrote: > > > On 3/28/16 9:02 PM, Khuong Truong Gia wrote: > >> Dear all, >> >> I am running umbrel

[gmx-users] Binding of a drug to a lipid bilayer using umbrella sampling method

2016-03-28 Thread Khuong Truong Gia
Dear all, I am running umbrella sampling simulation about binding of a drug (polymer) to a lipid bilayer. Could you please suggest me how can I do position-restraints the reference group (bilayer)? Do I need to restraint all lipid molecules? As I read in the gromacs manual there is cylinder

[gmx-users] Umbrella sampling error with drug molecule

2016-03-01 Thread Khuong Truong Gia
Hi all, I am using gromacs to run umbrella sampling simulation with a drug molecule (polymer). I got force field from PRODRG. When run pulling the drug I got this error: step 86530014: Water molecule starting at atom 8336 can not be settled. Check for bad contacts and/or reduce the timestep if

[gmx-users] Position restraint some molecules of a moleculetype in a system

2015-08-10 Thread Khuong Truong Gia
Hi all, I am using gromacs to run md simulation and I in my system I have 10 molecules of moleculetype A. I want to set position restraint for 3 molecules of moleculetype A and let 7 remained molecules relax. Can anyone help me to archive this goal? Thank you very much, Khuong -- Gromacs Users

[gmx-users] Martini v2.2 and water freezing

2015-08-05 Thread Khuong Truong Gia
Hi all, I have 2 questions and I need your help: First, I setup 2 coarse grained simulations using insane.py and martini_v2.2. In my systems I put protein on the surface of membrane, the first system using 1 protein and the second I use 8 protein. The first system run normally but in the second