[gmx-users] Unphysical conformations in decoupled free energy simulation

2013-08-05 Thread Joerg Sauter
Dear all, I am trying to compute the free energy of hydration for cellobiose (a beta (1-4) glucose dimer) using BAR in Gromacs 4.6.1. However, I encounter a problem. I find that the vacuum conformations of the molecule in a regular vacuum simulation differ from the conformations in the decou

Re: [gmx-users] Unphysical conformations in decoupled free energy simulation

2013-08-05 Thread Joerg Sauter
On 08/05/2013 01:54 PM, Justin Lemkul wrote: On 8/5/13 7:44 AM, Joerg Sauter wrote: Dear all, I am trying to compute the free energy of hydration for cellobiose (a beta (1-4) glucose dimer) using BAR in Gromacs 4.6.1. However, I encounter a problem. I find that the vacuum conformations

Re: [gmx-users] Unphysical conformations in decoupled free energy simulation

2013-08-05 Thread Joerg Sauter
On 08/05/2013 02:15 PM, Justin Lemkul wrote: On 8/5/13 8:12 AM, Joerg Sauter wrote: On 08/05/2013 01:54 PM, Justin Lemkul wrote: On 8/5/13 7:44 AM, Joerg Sauter wrote: Dear all, I am trying to compute the free energy of hydration for cellobiose (a beta (1-4) glucose dimer) using BAR in

[gmx-users] Partial incompatibility of pdb2gmx with 4 character residue names?

2013-08-15 Thread Joerg Sauter
Hi, I am building a tetramer of beta(1-4) linked glucose with pdb2gmx (Gromacs 4.6.3). I have three residue types BGLB BGLM BGLE defined in the aminoacids.rtp with which I want to built the chain BGLB BGLM BGLM BGLE. Using pdb2gmx works fine, until I link the residues via the specbond.dat fi

Re: [gmx-users] Partial incompatibility of pdb2gmx with 4 character residue names?

2013-08-15 Thread Joerg Sauter
es manually by using pdb2gmx -rtpres. Where would have been a good place for you to have read "Using three-letter .rtp residue names might make life easier. Consider using pdb2gmx -rtpres if you need longer names." Mark On Thu, Aug 15, 2013 at 3:45 PM, Joerg Sauter wrote: Hi, I am b