Re: [gmx-users] Re: forward and reverse free energy not consistant (Li Qiang)

2008-06-18 Thread David Mobley
nks >> >> Diana Lousa >> Instituto de Tecnologia Química e Biológica >> Universidade Nova de Lisboa >> Av. da República – EAN, >> 2780-157 Oeiras >> PORTUGAL >> >> >> -- Forwarded message -- >> From: Justin A. Lemkul <

Re: [gmx-users] Re: forward and reverse free energy not consistant (Li Qiang) (Diana Lousa)

2008-06-16 Thread Li Qiang
Thanks for advice. I will test it. Qiang ggroenh wrote: To rule out a sampling problem you can perform the simulations with everything else frozen or position restraints. Both backwards and forwards, and you can do it very fast, as there is nothing to equilibrate. If there is still a discrepa

Re: [gmx-users] Re: forward and reverse free energy not consistant (Li Qiang)

2008-06-16 Thread Justin A. Lemkul
PROTECTED] <mailto:[EMAIL PROTECTED]>> Date: 2008/6/16 Subject: Re: [gmx-users] Re: forward and reverse free energy not consistant (Li Qiang) To: Discussion list for GROMACS users <mailto:gmx-users@gromacs.org>> Which GMX version are you using? There's a known bug in version

[gmx-users] Re: forward and reverse free energy not consistant (Li Qiang) (Diana Lousa)

2008-06-16 Thread ggroenh
To rule out a sampling problem you can perform the simulations with everything else frozen or position restraints. Both backwards and forwards, and you can do it very fast, as there is nothing to equilibrate. If there is still a discrepancy between the two paths, you should suspect a proble

[gmx-users] Re: forward and reverse free energy not consistant (Li Qiang)

2008-06-16 Thread Diana Lousa
rwarded message -- From: Justin A. Lemkul <[EMAIL PROTECTED]> Date: 2008/6/16 Subject: Re: [gmx-users] Re: forward and reverse free energy not consistant (Li Qiang) To: Discussion list for GROMACS users Which GMX version are you using? There's a known bug in version 3.3.1 that has bee

Re: [gmx-users] Re: forward and reverse free energy not consistant (Li Qiang)

2008-06-16 Thread liqiang
Hi, It is 3.3.3. are the topology right? Can anybody kindly send me a topology with similar mutation so that I can compare? thanks a lot. Qiang Justin A. Lemkul wrote: Which GMX version are you using? There's a known bug in version 3.3.1 that has been fixed in 3.3.3. -Justin friendli w

Re: [gmx-users] Re: forward and reverse free energy not consistant (Li Qiang)

2008-06-16 Thread Justin A. Lemkul
Which GMX version are you using? There's a known bug in version 3.3.1 that has been fixed in 3.3.3. -Justin friendli wrote: Hi, I use thermodynamics integration. The protocol is 1000step energy minimization, 20 ps bond-constraint MD, and then 200ps MD for collecting dgdl. thanks Qiang

Re: [gmx-users] Re: forward and reverse free energy not consistant (Li Qiang)

2008-06-16 Thread friendli
Hi, I use thermodynamics integration. The protocol is 1000step energy minimization, 20 ps bond-constraint MD, and then 200ps MD for collecting dgdl. thanks Qiang Gerrit Groenhof wrote: Looks like hysteresis. Do you do slow growth, or discrete FEP? Gerrit Dear all Gmxers, I am calcula

[gmx-users] Re: forward and reverse free energy not consistant (Li Qiang)

2008-06-16 Thread Gerrit Groenhof
Looks like hysteresis. Do you do slow growth, or discrete FEP? Gerrit Dear all Gmxers, I am calculating a mutation free energy from L<->A for a five AA peptides using G96 53a6 force field. however, my dG_for and dG_rev is quite different. dG_for(lambda=0.00) = - 9.9 kJ/mol dG_rev(lambda=1.