[gmx-users] CUDA kit for Fedora 21

2015-04-27 Thread Raj D
Dear User, I have very basic knowledge of linux and relatively new to gromacs too, I have Dell workstation (OS Fedora 21 ) with NVIDIA graphics card available , Just two weeks before I have compiled gromacs without knowing its capability of GPU , ( I used option of quick installation guide to

[gmx-users] Simulations with Verlet scheme, virtual sites and heterogeneous systems

2015-04-27 Thread Ivan Gladich
Dear Gromacs users, I am experiencing a strange behavior using Verlet-cutoff scheme in combination with a water model with virtual sites. I am simulating an ice slab with NE6 water model. NE6 water model is used for simulation of ice and it consists of 3 atom sites and 3 virtual sites.

Re: [gmx-users] assign disulfide bond

2015-04-27 Thread Mark Abraham
On Fri, Apr 24, 2015 at 1:38 PM, Mark Abraham mark.j.abra...@gmail.com wrote: On Fri, Apr 24, 2015 at 10:55 AM, HongTham hongtham0...@gmail.com wrote: Hi all gmx user, I want to ask if there is the way to specialized the residue index to assign a disulfide bond between 2 apart Cysteins.

Re: [gmx-users] the relationship between mdp file and the force field

2015-04-27 Thread Justin Lemkul
On 4/27/15 9:01 AM, Brett wrote: Dear Justin, I have read some of the force fields original paper, but my purpose is to use MD to settle some biological issues, thus I am afraid I do not have such deep understanding what explained in the original force field papers. For Force field 6, here

Re: [gmx-users] difference of calculation time between the numbers of fep-lambdas values

2015-04-27 Thread Justin Lemkul
On 4/27/15 1:29 AM, nao.morish...@takeda.com wrote: Dear Gromacs Users, I would appreciate you to give me any comments or hints about the question below. What makes the calculation time much longer when I calculate a solvation free energy using the mdp input1 compared to the mdp input2?

Re: [gmx-users] difference of calculation time between the numbers of fep-lambdas values

2015-04-27 Thread Hannes Loeffler
On Mon, 27 Apr 2015 07:43:51 -0400 Justin Lemkul jalem...@vt.edu wrote: Note that without couple-moltype, you're going to be decoupling the whole system, which is (1) not what you want for calculating solvation free energy and (2) extremely slow. There is an inherent slowdown when running

Re: [gmx-users] the relationship between mdp file and the force field

2015-04-27 Thread Brett
Dear Justin, I have read some of the force fields original paper, but my purpose is to use MD to settle some biological issues, thus I am afraid I do not have such deep understanding what explained in the original force field papers. For Force field 6, here I mean AMBER99SB_ILDNprotein. For

Re: [gmx-users] Simulations with Verlet scheme, virtual sites and heterogeneous systems

2015-04-27 Thread Mark Abraham
On Mon, Apr 27, 2015 at 12:26 PM, Ivan Gladich iglad...@sissa.it wrote: Dear Gromacs users, I am experiencing a strange behavior using Verlet-cutoff scheme in combination with a water model with virtual sites. I am simulating an ice slab with NE6 water model. NE6 water model is used

Re: [gmx-users] difference of calculation time between the numbers of fep-lambdas values

2015-04-27 Thread Justin Lemkul
On 4/27/15 9:02 AM, Hannes Loeffler wrote: On Mon, 27 Apr 2015 07:43:51 -0400 Justin Lemkul jalem...@vt.edu wrote: Note that without couple-moltype, you're going to be decoupling the whole system, which is (1) not what you want for calculating solvation free energy and (2) extremely slow.

Re: [gmx-users] the relationship between mdp file and the force field

2015-04-27 Thread Justin Lemkul
On 4/26/15 10:17 PM, Brett wrote: Dear All, In the on-line Justin tutorial on lysozyme, the several mdp files are for the specific force field OPLS-AA force field. It specifically mentioned Settings, particularly nonbonded interaction settings, will be different for other force fields.

Re: [gmx-users] difference of calculation time between the numbers of fep-lambdas values

2015-04-27 Thread nao.morishita
Hi Justin and Hannes, Thank you for the replay. I apologize for the insufficient information. Actually, I calculated them with couple-moltype = solute and init-lambda-state = 1. The other parameters except for fep-lambdas, the number of core(8) and hardware were same. When I look at REAL

Re: [gmx-users] difference of calculation time between the numbers of fep-lambdas values

2015-04-27 Thread Justin Lemkul
On 4/27/15 8:34 PM, nao.morish...@takeda.com wrote: Hi Justin and Hannes, Thank you for the replay. I apologize for the insufficient information. Actually, I calculated them with couple-moltype = solute and init-lambda-state = 1. The other parameters except for fep-lambdas, the number

[gmx-users] on rlist

2015-04-27 Thread Brett
Dear All, In the MD mdp file for the old version of on-line tutorials for lysozyme, in the neighbor search, there is an item rlist, but in the MD mdp file for the new version of on-line tutorials for lysozyme, in the neighbor search, there is no item rlist. Will you please tell me why? In

[gmx-users] Protein fragments during production simulation

2015-04-27 Thread SAPNA BORAH
Dear all, I am trying to simulate a globular protein predicted by Ab-initio method using web servers, Robetta and Itasser. I am currently using Gromacs 4.6.5. A problem has occured during the production md run, when my protein starts to break into fragments while it remains inside the water box.

Re: [gmx-users] difference of calculation time between the numbers of fep-lambdas values

2015-04-27 Thread Hannes Loeffler
On Mon, 27 Apr 2015 09:05:05 -0400 Justin Lemkul jalem...@vt.edu wrote: On 4/27/15 9:02 AM, Hannes Loeffler wrote: On Mon, 27 Apr 2015 07:43:51 -0400 Justin Lemkul jalem...@vt.edu wrote: Note that without couple-moltype, you're going to be decoupling the whole system, which is (1)

[gmx-users] MD simulation of metalloprotein

2015-04-27 Thread Biplab Ghosh
Dear All, I am a beginner in MD and started with Gromacs. I would like to simulate the dynamics of a homo-dimeric protein containing 2 Mn atoms at the active site. I would appreciate any sorts of help in this regards, e.g., please share your experience and/or relevant source in the web/published