Re: [gmx-users] Entropy correction in PMF

2008-04-25 Thread Ángel Piñeiro
Thank you David, what you are suggesting is indeed a difference between substrate-protein and methane-methane that seems more clearly related with the entropic correction. If I understood well, what you mean is that the space accessible to a ligand when it is pulled into a protein is restricted by

Re: [gmx-users] Entropy correction in PMF

2008-04-24 Thread David Mobley
Chris, I think you are correct here. For binding calculations there is probably a further trick relating to how to define an unbound state that has a well-defined concentration. This I think depends on how one is pulling -- i.e. doing simple radial PMFs is probably a bad idea, because to even conv

RE: [gmx-users] Entropy correction in PMF

2008-04-24 Thread Ángel Piñeiro
; > From: [EMAIL PROTECTED] > > To: gmx-users@gromacs.org > > Subject: [gmx-users] Entropy correction in PMF > > > > That sentence could definitely use some massaging. Try this: > > > > Whether one needs to correct for this contribution depends on what > the

RE: [gmx-users] Entropy correction in PMF

2008-04-24 Thread Berk Hess
> Date: Wed, 23 Apr 2008 20:34:40 -0400 > From: [EMAIL PROTECTED] > To: gmx-users@gromacs.org > Subject: [gmx-users] Entropy correction in PMF > > That sentence could definitely use some massaging. Try this: > > Whether one needs to correct for this contribution d

[gmx-users] Entropy correction in PMF

2008-04-23 Thread chris . neale
That sentence could definitely use some massaging. Try this: Whether one needs to correct for this contribution depends on what the pmf should represent. When one wants to pull a substrate into a protein, this entropic term indeed contributes to the work to get the substrate into the protein. Thi

Re: [gmx-users] Entropy correction in PMF

2008-04-23 Thread Ángel Piñeiro
I sent the attached message on last March 31 but I didn't get any answer... may be the right people was not available at that time and that is why I am trying again. I would thank a lot to have some more detail about this paragraph in the gromacs manual (version 3.3, chapter 6, page 111): “Whether

[gmx-users] Entropy correction in PMF

2008-03-30 Thread Ángel Piñeiro
Dear all, My question is related to the calculation of absolute binding Gibbs energies more than to the use of Gromacs but it is motivated by a paragraph of the Gromacs manual version 3.3 (and also on several papers by Gilson, Karplus, and others), so I hope someone can help me. We have cal