[gmx-users] Re: Salt-bridge segmentation fault

[Kavyashree M]

Thank you,

I have noticed this in the output of the g_saltbr. Later
I separated the files according to what ever I require.
My worry was only that of the dimeric interface which
could not be seen because it is separated.

I will try by giving a separate tpr file without water.

Thank you
Kavya


On Thu, Feb 7, 2013 at 5:31 PM, Justin Lemkul <jalemkul at vt.edu> wrote:

>
>
> On 2/7/13 6:42 AM, Kavyashree M wrote:
>
>> Dear users,
>>
>> After simulation dimers appear separated, I was
>> able to do saltbridge calculation on this. This will
>> be different than doing it on a dimer which are together.
>> Am I correct?
>>
>>
> Most Gromacs tools handle PBC well for simple metrics like measurements.
>  I would suspect that the seg fault comes from a mismatch in the .tpr and
> .xtc contents.  g_saltbr is a rather stupid tool that tries to guess salt
> bridges based on anything that's charged, which includes ions and other
> groups that don't necessarily participate in such interactions (see the
> discussion on this same topic in recent days).  Perhaps if g_saltbr is
> identifying elements that it wants to examine from the .tpr file but can't
> find them in the trajectory, you get a seg fault.  This shouldn't happen,
> but you can also use tpbconv to produce a subset .tpr file with just the
> protein for the purposes of analysis.
>
> -Justin
>
>
>  On Thu, Feb 7, 2013 at 3:39 PM, Kavyashree M <hmkvsri at gmail.com> wrote:
>>
>>  Dear users,
>>>
>>> While calculating salt bridges using g_saltbr I got
>>> segmentation fault when I used trajectory with only
>>> the protein. But when I used the trajectory with
>>> water It worked. But the problem was that the
>>> monomers were far apart in the trajectory with water
>>> and not with the only-protein trajectory.
>>>
>>> Kindly help!
>>>
>>> Thank you
>>> Kavya
>>>
>>>
>>>
> --
> ==============================**==========
>
> Justin A. Lemkul, Ph.D.
> Research Scientist
> Department of Biochemistry
> Virginia Tech
> Blacksburg, VA
> jalemkul[at]vt.edu | (540) 231-9080
> http://www.bevanlab.biochem.**vt.edu/Pages/Personal/justin<http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin>
>
> ==============================**==========
> --
> gmx-users mailing list    gmx-users at gromacs.org
> http://lists.gromacs.org/**mailman/listinfo/gmx-users<http://lists.gromacs.org/mailman/listinfo/gmx-users>
> * Please search the archive at http://www.gromacs.org/**
> Support/Mailing_Lists/Search<http://www.gromacs.org/Support/Mailing_Lists/Search>before posting!
> * Please don't post (un)subscribe requests to the list. Use the www
> interface or send it to gmx-users-request at gromacs.org.
> * Can't post? Read http://www.gromacs.org/**Support/Mailing_Lists<http://www.gromacs.org/Support/Mailing_Lists>
>