[gmx-users] Creating a simple water box

2020-03-14 Thread dodia
Dear gromacs users, I was trying a simple gmx solvate test on a water box of size 25*20*20 angstrom, creating a water box of density 1 g/cm^3. By my calculations the no. of water molecules in the box should by 332 (each water molecule has a volume of (3.11 angstrom)^3). When I use the solvate

[gmx-users] (no subject)

2020-03-14 Thread FAISAL NABI
Hi, I have been a new user and i was following the protein-ligand complex tutorial for MD. I have used GROMOS96 54a7 FF and to build ligand topology i have used ATB webserver. I did download the .itp and .pdb file from there and converted that to .gro file. The problem i am facing is it shows an

[gmx-users] Can you help regarding this

2020-03-14 Thread Prasanth G, Research Scholar
Dear Kushal, Regarding the first error, I feel that you have done a few mistakes while updating your topology section as your system has more atoms than what is in the topology. Kindly go through the tutorials on this site - http://www.mdtutorials.com/gmx/index.html, to get a picture on how to do

Re: [gmx-users] Gromacs Install problem

2020-03-14 Thread Paul bauer
Hello, if you have found a bug in the multi-dimensional array please report it on redmine.gromacs.org so we can fix it, together with the build configuration that causes it. Cheers Paul On 14/03/2020 00:51, Alexander Tzanov wrote: The new version from March 2020.1 is buggy. Try version

[gmx-users] Request for Plumed sample scripts

2020-03-14 Thread Peter Mawanga
Hello everyone I am looking for a sample Gromacs script and a Plumed file with Distance Colvar. Please send me one if feasible. -- Cheers Peter -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't

[gmx-users] potential energy doesn't have negative value

2020-03-14 Thread Afsane Farhadi
I generate a box of 100 molecules of methyldiethanolamine with insert-molecules command .I downloaded its itp file from ATB server. I think that forcefield is gromos . after an energy minimization the potential energy is positive.  the mdp file is attached. Sent from Yahoo Mail on Android--

Re: [gmx-users] Linking MYR residue to N-terminus using pdb2gmx

2020-03-14 Thread Neena Susan Eappen
Hi Billy, 1. Firstly, why is that gromacs reads MYR as residue 2 and not 1? What does it say in your PDB file? 2. There is no atom labelled C in your MYR atom list. Looks like you have listed atom C in the dihedral type (ffnonbonded.itp), change that. 3. If you think it is not

Re: [gmx-users] potential energy doesn't have negative value

2020-03-14 Thread Justin Lemkul
On 3/14/20 7:15 PM, Afsane Farhadi wrote: I generate a box of 100 molecules of methyldiethanolamine with insert-molecules command .I downloaded its itp file from ATB server. I think that forcefield is gromos . after an energy minimization the potential energy is positive.  the mdp file is

Re: [gmx-users] potential energy doesn't have negative value

2020-03-14 Thread Justin Lemkul
On 3/14/20 8:05 PM, Afsane Farhadi wrote: what do I have to do for solving this mater? I want to use a opls as forcefield.  how can I find that forcefield for methyldiethanolamine? http://zarbi.chem.yale.edu/ligpargen/ -Justin Sent from Yahoo Mail on Android On Sun, Mar 15, 2020 at

Re: [gmx-users] Linking MYR residue to N-terminus using pdb2gmx

2020-03-14 Thread Justin Lemkul
On 3/14/20 1:59 AM, Billy Williams-Noonan wrote: Hi Experts, This is a long-ish e-mail so thank you very much for your time I am using the GROMACS compatible charmm36 forcefield for betapeptides described here: https://gitlab.com/awacha/charmm-beta.ff In merged.rtp I have redefined the MYR

Re: [gmx-users] potential energy doesn't have negative value

2020-03-14 Thread Afsane Farhadi
what do I have to do for solving this mater? I want to use a opls as forcefield.  how can I find that forcefield for methyldiethanolamine? Sent from Yahoo Mail on Android On Sun, Mar 15, 2020 at 3:29, Justin Lemkul wrote: On 3/14/20 7:15 PM, Afsane Farhadi wrote: > I generate a box of

Re: [gmx-users] potential energy doesn't have negative value

2020-03-14 Thread Afsane Farhadi
thank you so much Mr.justin  Sent from Yahoo Mail on Android On Sun, Mar 15, 2020 at 3:38, Justin Lemkul wrote: On 3/14/20 8:05 PM, Afsane Farhadi wrote: > what do I have to do for solving this mater? I want to use a opls as > forcefield.  how can I find that forcefield for

[gmx-users] Linking MYR residue to N-terminus using pdb2gmx

2020-03-14 Thread Billy Williams-Noonan
Hi Experts, This is a long-ish e-mail so thank you very much for your time I am using the GROMACS compatible charmm36 forcefield for betapeptides described here: https://gitlab.com/awacha/charmm-beta.ff In merged.rtp I have redefined the MYR residue hoping I could link it to the N-terminus of

[gmx-users] Can you help regarding this

2020-03-14 Thread Kushal Roy
GROMACS is written by: Emile Apol Rossen Apostolov Paul Bauer Herman J.C. Berendsen Par BjelkmarAldert van Buuren Rudi van Drunen Anton Feenstra Gerrit GroenhofAleksei Iupinov Christoph Junghans Anca Hamuraru Vincent