[gmx-users] g_lie query
Justin A. Lemkul
jalemkul at vt.edu
Tue Dec 28 18:33:53 CET 2010
Anirban Ghosh wrote:
> Thanks a lot Justin for the reply.
> Yes I am going through all the relevant literature on LIE.
> Actually the lie.xvg file contains the same value of -25.4 for all the
> frames. So I am getting a straight line plot. Why is this happening? Am
> I missing out something?
>
If the interactions of your ligand and its receptor are stable, then there may
be no change in the energetics. I don't know anything about your system, so I
can't say anything beyond that.
-Justin
> Thanks a lot again.
>
> Anirban
>
>
> On Tue, Dec 28, 2010 at 6:24 PM, Justin A. Lemkul <jalemkul at vt.edu
> <mailto:jalemkul at vt.edu>> wrote:
>
>
>
> Anirban Ghosh wrote:
>
> Thanks a lot Justin for the reply.
> So I ran a simulation with my ligand in water for 1 ns and using
> g_energy I calculated the LG-14 and Coulomb-14 values from the
> .edr file. I supplied the average of these two values as my Elj
> and Eqq to g_lie and I got the DGbind as -25.4. Is this the
> correct way to do this?
>
>
> Again I would ask you to not rely entirely upon my advice for this.
> I have only examined the LIE method sparingly. My best answer is,
> "probably," but do read the literature on the method to be sure.
>
>
> And why am I getting only a single value of DGbind for all the
> frames captured in the .edr file?
>
>
> The lie.xvg file contains the LIE values as a function of time.
> What's printed to the screen is the average value and standard
> deviation.
>
> -Justin
>
> Thanks a lot.
>
> Anirban
>
>
> On Mon, Dec 27, 2010 at 11:51 PM, Justin A. Lemkul
> <jalemkul at vt.edu <mailto:jalemkul at vt.edu>
> <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>>> wrote:
>
>
>
> Anirban Ghosh wrote:
>
> Thanks Justin for the reply.
> I have through the threads about g_lie, but cannot understand
> how to get the values for Elj and Eqq for a particular
> ligand.
> Like in my case for a system consisting of a beta2AR
> protein +
> dopamine (ligand) + POPC + water, what should be the
> values for
> Elj and Eqq?
>
>
> To obtain these (from my limited understanding), you would
> have to
> run a simulation of your ligand in water, decomposing the
> nonbonded
> energies between the ligand and solvent into LJ and Coulombic
> components. Those are your values.
>
> I should also note that simply going through the archive to
> inform
> yourself about the LIE method is insufficient. The original
> literature, and several subsequent papers (one at least
> within the
> last year, IIRC), describes the accuracy of the method and
> what it
> needs to be properly run.
>
> -Justin
>
> Thanks a lot.
>
> Anirban
> On Sat, Jul 17, 2010 at 4:56 PM, Justin A. Lemkul
> <jalemkul at vt.edu <mailto:jalemkul at vt.edu>
> <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>>
> <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>
> <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>>>> wrote:
>
>
>
> Anirban Ghosh wrote:
>
> Hi ALL,
>
> I have run a protein + ligand (dopamine)
> simulation. Now
> I want
> to calculate the free energy of binding using
> g_lie. But
> g_lie
> asks for two values: Elj and Eqq. How or from
> where can I get
> these values for my ligand? Also, do I need to run a
> simulation
> with only the ligand? And, is there any other way
> (like
> MMGBSA
> in Amber) to calculate the free energy for my
> simulation? Any
> suggestion is welcome.
> Thanks a lot in advance.
>
>
> Go to the literature and understand what information is
> needed for
> such a simulation, and then look into the list
> archives and
> you'll
> find dozens of threads about using g_lie.
>
> -Justin
>
>
> Regards,
>
> Anirban
>
>
> -- ========================================
>
> Justin A. Lemkul
> Ph.D. Candidate
> ICTAS Doctoral Scholar
> MILES-IGERT Trainee
> Department of Biochemistry
> Virginia Tech
> Blacksburg, VA
> jalemkul[at]vt.edu <http://vt.edu> <http://vt.edu>
> <http://vt.edu> | (540)
>
> 231-9080
>
> http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin
>
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> -- ========================================
>
> Justin A. Lemkul
> Ph.D. Candidate
> ICTAS Doctoral Scholar
> MILES-IGERT Trainee
> Department of Biochemistry
> Virginia Tech
> Blacksburg, VA
> jalemkul[at]vt.edu <http://vt.edu> <http://vt.edu> | (540)
> 231-9080
> http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin
>
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> --
> ========================================
>
> Justin A. Lemkul
> Ph.D. Candidate
> ICTAS Doctoral Scholar
> MILES-IGERT Trainee
> Department of Biochemistry
> Virginia Tech
> Blacksburg, VA
> jalemkul[at]vt.edu <http://vt.edu> | (540) 231-9080
> http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin
>
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--
========================================
Justin A. Lemkul
Ph.D. Candidate
ICTAS Doctoral Scholar
MILES-IGERT Trainee
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin
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