Re: [gmx-users] Rerun error

2014-01-26 Thread Mark Abraham
Hi, Thanks for the full description. It seems like your file system cannot handle files over 2gb even for splitting, which is not surprising, because the limitation is based on the use of a 32-bit integer. You should get access to a better file system, where maybe your file can be read. You may

[gmx-users] can we differentiate it?

2014-01-26 Thread Albert
Hello: I've got a question on the membrane protein simulation in Gromacs. I noticed that both water and ions can wrap between up leaflet and low leaflet. I am just wondering can we restrain both water and ions in the same leaftlet? eg: the one in the up leaftlet always in the up leaftlet during

Re: [gmx-users] can we differentiate it?

2014-01-26 Thread Tsjerk Wassenaar
Hi Albert, Turn off PBC in the z-direction, or introduce a vacuum layer and set the compressibility in the z-direction to zero. Cheers, Tsjerk On Sun, Jan 26, 2014 at 9:29 AM, Albert mailmd2...@gmail.com wrote: Hello: I've got a question on the membrane protein simulation in Gromacs. I

[gmx-users] Adding Ions step

2014-01-26 Thread Mahboobeh Eslami
hi GMX users The output of pdb2gmx told me that the protein-ligand complex has a net charge of 0(zero) but  at the last line of my[ atoms ] directive in topol.top;qtot 2.749e-06 .  be  read . 1)What does this mean? 2) if my system has a net charge of 0(zero),must iadd ions to my system for

Re: [gmx-users] Adding Ions step

2014-01-26 Thread Mark Abraham
On Jan 26, 2014 10:57 AM, Mahboobeh Eslami mahboobeh.esl...@yahoo.com wrote: hi GMX users The output of pdb2gmx told me that the protein-ligand complex has a net charge of 0(zero) but at the last line of my[ atoms ] directive in topol.top;qtot 2.749e-06 . be read . 1)What does this mean?

Re: [gmx-users] center of dodecahedron

2014-01-26 Thread Justin Lemkul
On 1/26/14, 3:07 AM, Mahboobeh Eslami wrote: hi GMX users i simulate protein ligand complex in dodecahedron box when i use following command editconf -f complex.pdb -o newbox.gro -bt dodecahedron -d 1.0 -c My complex is not located in the center of box, How do I put the complex in the

Re: [gmx-users] center of dodecahedron

2014-01-26 Thread Mark Abraham
On Jan 26, 2014 9:30 AM, Mahboobeh Eslami mahboobeh.esl...@yahoo.com wrote: hi GMX users i simulate protein ligand complex in dodecahedron box when i use following command editconf -f complex.pdb -o newbox.gro -bt dodecahedron -d 1.0 -c My complex is not located in the center of box, How

Re: [gmx-users] center of dodecahedron

2014-01-26 Thread Tsjerk Wassenaar
Oh, what a wonderful PBC confusion :) Actually, it is in the center of the triclinic cell corresponding to a rhombic dodecahedron, but it is not in the center of the rectangular brick representation of that, which is the default output representation. The rhombic dodechahedron does not have an

Re: [gmx-users] Carboxylate OPLS-AA parameters

2014-01-26 Thread rankinb
After looking at the parameters used for Asp and Glu, I have found that those are the ones I identified to use for my simulations of carboxylates. However, there is no terminal methyl group on Asp or Glu, like there is on a linear carboxylate. So, do you think it would be acceptable to use a

Re: [gmx-users] Carboxylate OPLS-AA parameters

2014-01-26 Thread Justin Lemkul
On 1/26/14, 2:50 PM, rankinb wrote: After looking at the parameters used for Asp and Glu, I have found that those are the ones I identified to use for my simulations of carboxylates. However, there is no terminal methyl group on Asp or Glu, like there is on a linear carboxylate. So, do you