[gmx-users] WHAM with Pull coordinate angle-axis

2016-08-28 Thread Lukas Zimmermann
Dear GROMACS users, I used the new Pull Geometry angle-axis to define the angle between a peptide (with two c-alpha atoms) and the z-axis as pull coordinate. I have generated a pull trajectory where this angle changes over time from about 80 degree to 0 degree approximately, over the total time

[gmx-users] Flat-bottomed potential for Sampling in particular volume

2016-07-05 Thread Lukas Zimmermann
Dear GROMACS user, I use the pull code to pull one peptide away from a larger globular protein. For subsequent Umbrella Sampling analyses, I want to keep the peptide within a certain (cylindric, say) volume. However, I want to define the longitudinal axis of the cylider running parallel to the

Re: [gmx-users] PMF steadily increasing

2016-06-20 Thread Lukas Zimmermann
frames from pull.xtc and I do not see each COM-COM distance that would be required to have exactly, say, 0.1 nm spacing, so I use a script which selects frames which resemble 0.1 nm spacing as closely as possible, so there might some deviation. 2016-06-16 21:24 GMT+02:00 Lukas Zimmermann <luk

Re: [gmx-users] PMF steadily increasing

2016-06-16 Thread Lukas Zimmermann
> From: gromacs.org_gmx-users-boun...@maillist.sys.kth.se < > gromacs.org_gmx-users-boun...@maillist.sys.kth.se> on behalf of Lukas > Zimmermann <luk.zi...@gmail.com> > Sent: 15 June 2016 12:45:51 > To: gmx-us...@gromacs.org > Subject

[gmx-users] PMF steadily increasing

2016-06-15 Thread Lukas Zimmermann
Dear GROMACS community, I performed umbrella sampling study to estimate the binding free energy between a globular protein with 568 residues and a small peptide with 13 residues. I use the pull code with k = 800 and rate = 0.005 to generate the initial conformations over the time course of 1200

[gmx-users] Umbrella Sampling - choice of pull-coord?-dim

2016-05-14 Thread Lukas Zimmermann
Dear GROMACS users, I am interested in the role of the mdp parameter pull-coord?-dim when sampling a particular umbrella window after having generated initial configurations for, say, the COM distance between two groups being the reaction coordinate. I know that these options can be controlled