Re: [gmx-users] typeB in FEP calculations

2016-09-30 Thread Rui Neves
Thank you very much for your help. I think that I finally got this straight. Cheers, Rui On 27 September 2016 at 11:26, Hannes Loeffler wrote: > On Tue, 27 Sep 2016 11:08:45 +0100 > Rui Neves wrote: > > > However, what I would like to know is: > > At the beggining of the topology I call for

Re: [gmx-users] typeB in FEP calculations

2016-09-27 Thread Hannes Loeffler
On Tue, 27 Sep 2016 11:08:45 +0100 Rui Neves wrote: > However, what I would like to know is: > At the beggining of the topology I call for all the bonded terms > ('#include ffbonded.itp), and then in the [ atoms ] section, I > specify the massB, typeB and chargeB for the B-state. Do I have to >

Re: [gmx-users] typeB in FEP calculations

2016-09-27 Thread Rui Neves
Hi Billy, Thank you so much for the papers you suggested. I hadn't come across them. However, what I would like to know is: At the beggining of the topology I call for all the bonded terms ('#include ffbonded.itp), and then in the [ atoms ] section, I specify the massB, typeB and chargeB for the

Re: [gmx-users] typeB in FEP calculations

2016-09-26 Thread Billy Williams-Noonan
Hi there, Because the bond and angle parameters are harmonic terms in many forcefields, my understanding is that they should cancel out during a closed thermodynamic cycle. So you will not need state B parameters for those terms. However, you will need to state state B terms for proper and impro

[gmx-users] typeB in FEP calculations

2016-09-26 Thread Rui Neves
Hi Gromacs users, I am trying to determine a relative binding free-energy of two hypothetical ligands (A -> B). To do this, I must indicate a typeB for the atomtypes in B. Once this is done, do I have to explicitly include the bonded parameters for the B state, if I started by loading all the par