RE: [gmx-users] Carbohydrate MD Simulation

2009-08-03 Thread Jim Kress
should give you at starting point. Jim > -Original Message- > From: gmx-users-boun...@gromacs.org > [mailto:gmx-users-boun...@gromacs.org] On Behalf Of Nancy > Sent: Friday, July 31, 2009 5:19 PM > To: Discussion list for GROMACS users > Subject: Re: [gmx-users] Carbohyd

Re: [gmx-users] Carbohydrate MD Simulation

2009-08-01 Thread Nancy
I used gzip to uncompress the file first: # gzip -d topolbuild1_2_1.tgz and then I used tar: # tar -xvf topolbuild1_2_1.tar This seems to work. On Sat, Aug 1, 2009 at 6:05 PM, Justin A. Lemkul wrote: > > > Nancy wrote: > >> Hello, >> >> I downloaded "topolbuild1_2_1.tgz" from the URL: >>

Re: [gmx-users] Carbohydrate MD Simulation

2009-08-01 Thread Justin A. Lemkul
Nancy wrote: Hello, I downloaded "topolbuild1_2_1.tgz" from the URL: http://www.gromacs.org/@api/deki/files/40/=topolbuild1_2_1.tgz However, when I tried to decompress the file, I received the following error message: # tar -xvf topolbuild1_2_1.tgz You have to unzip it as well, i.e.:

Re: [gmx-users] Carbohydrate MD Simulation

2009-08-01 Thread Nancy
Hello, I downloaded "topolbuild1_2_1.tgz" from the URL: http://www.gromacs.org/@api/deki/files/40/=topolbuild1_2_1.tgz However, when I tried to decompress the file, I received the following error message: # tar -xvf topolbuild1_2_1.tgz tar: This does not look like a tar archive tar: Skipping to

Re: [gmx-users] Carbohydrate MD Simulation

2009-08-01 Thread Bruce D. Ray
On Fri, Jul 31, 2009 at 5:19:19 PM, Nancy wrote: > If it necessary to manually create force field parameters for each molecule, then how can one run a > simulation involving a number of arbitrary molecules (e.g. a set of mono and disaccharides) for > which there are no existing force fields? > >

Re:[gmx-users] Carbohydrate MD Simulation

2009-07-31 Thread fufengliu
Hi Nancy, I think that the atom C1 in residue TRP 1 does not exist in rtp entry. In other words, atom C1 is not understood by the software. You should change the atom type in order to be understood. I have a question, how do you obtain the URL about trehalose. Because I want to some polyols f

Re: [gmx-users] Carbohydrate MD Simulation

2009-07-31 Thread Justin A. Lemkul
Nancy wrote: High-throughput "in silico" screening (e.g. for ligand-protein binding) has been performed on a number of systems. How are such automated simulations performed (I assume they utilize molecular dynamics)? I doubt that large classes of ligands have been done effectively with MD

Re: [gmx-users] Carbohydrate MD Simulation

2009-07-31 Thread Nancy
High-throughput "in silico" screening (e.g. for ligand-protein binding) has been performed on a number of systems. How are such automated simulations performed (I assume they utilize molecular dynamics)? On Fri, Jul 31, 2009 at 5:47 PM, Justin A. Lemkul wrote: > > > Nancy wrote: > >> If it n

Re: [gmx-users] Carbohydrate MD Simulation

2009-07-31 Thread Justin A. Lemkul
Nancy wrote: If it necessary to manually create force field parameters for each molecule, then how can one run a simulation involving a number of arbitrary molecules (e.g. a set of mono and disaccharides) for which there are no existing force fields? Do you know of any other MD software pac

Re: [gmx-users] Carbohydrate MD Simulation

2009-07-31 Thread Nancy
If it necessary to manually create force field parameters for each molecule, then how can one run a simulation involving a number of arbitrary molecules (e.g. a set of mono and disaccharides) for which there are no existing force fields? Do you know of any other MD software package that is capable

Re: [gmx-users] Carbohydrate MD Simulation

2009-07-31 Thread Justin A. Lemkul
Nancy wrote: Hello, I am trying to run a MD simulation on trehalose (glucose disaccharide) in water. I obtained the PDB file from the URL: http://www.rcsb.org/pdb/files/ligand/TRE_model.pdb . When I run pdb2gmx on the PDB file: pdb2gmx -f TRE_model.pdb -o TRE_model.gro -v I chose force