Re: [gmx-users] Dynamics of the salt-bridges

2013-02-04 Thread Erik Marklund
Hi, If you don't care about the exact distances, but rather the time the groups spend within a certain distance, g_hbond -contact can be useful. Best, Erik On Feb 3, 2013, at 6:36 PM, James Starlight wrote: Justin, 1 )for example I want to select in index file only all asp, glu and his re

Re: [gmx-users] Dynamics of the salt-bridges

2013-02-03 Thread Justin Lemkul
On 2/3/13 12:36 PM, James Starlight wrote: Justin, 1 )for example I want to select in index file only all asp, glu and his residues ( I could find selection by residue type only). What you would do is create a complement to that group - keep all the Asp, Glu, and His charged and use -zeroq

Re: [gmx-users] Dynamics of the salt-bridges

2013-02-03 Thread James Starlight
Justin, 1 )for example I want to select in index file only all asp, glu and his residues ( I could find selection by residue type only). 2) Than I'd like that gromacs compute dynamics of the distance between that charge groups (providing only truncated .tpr file as the input) but only. Could othe

Re: [gmx-users] Dynamics of the salt-bridges

2013-02-03 Thread Justin Lemkul
On 2/3/13 1:01 AM, James Starlight wrote: Justin, thanks again for suggestions. I'm not quite sure how I can use tpbconv -zeroq. For example I want to reduce charges of all amino acids except Asp Glu and His ( to monitor s.b dynamics between that groups only). As I understood -zeroq working

Re: [gmx-users] Dynamics of the salt-bridges

2013-02-02 Thread James Starlight
Justin, thanks again for suggestions. I'm not quite sure how I can use tpbconv -zeroq. For example I want to reduce charges of all amino acids except Asp Glu and His ( to monitor s.b dynamics between that groups only). As I understood -zeroq working with the groups defined in the index file so I

Re: [gmx-users] Dynamics of the salt-bridges

2013-02-02 Thread Justin Lemkul
On 2/2/13 12:18 AM, James Starlight wrote: Justin, I suppose that the ussage of the sub-set of trajectories is suitable when you've already known possible salt-bridge pairs. But that time I'd like to obtain that information from my trajectory. E.g I have membrane-embedded protein which is the

Re: [gmx-users] Dynamics of the salt-bridges

2013-02-01 Thread James Starlight
Justin, I suppose that the ussage of the sub-set of trajectories is suitable when you've already known possible salt-bridge pairs. But that time I'd like to obtain that information from my trajectory. E.g I have membrane-embedded protein which is the buddle of alpha-helixes. I want to examine dyna

Re: [gmx-users] Dynamics of the salt-bridges

2013-02-01 Thread Justin Lemkul
On 2/1/13 3:22 PM, James Starlight wrote: Dear Gromacs users! I have trajectory from which I want to investigate dynamics of all possible salt bridges (E.g distance between adjacent + and - charged residues) of my protein during the simulation As I understood ussage of g_saltbr -t -sep could

[gmx-users] Dynamics of the salt-bridges

2013-02-01 Thread James Starlight
Dear Gromacs users! I have trajectory from which I want to investigate dynamics of all possible salt bridges (E.g distance between adjacent + and - charged residues) of my protein during the simulation As I understood ussage of g_saltbr -t -sep could be suitable for such thing but I'm not sure i