Re: [AMBER] binding energy calculated by mm_pbsa.pl

From: Ray Luo, Ph.D. <ray.luo.uci.edu>
Date: Sun, 20 Nov 2011 07:00:59 -0800

Dear Qinghua,

For one thing, your PBSUR and GBSUR are already different -57.5 vs
-9.7.Apparently you are using different parameters between the two
models.

Maybe I shall recommend using the latest Ambertool so it's easier to
trace down your problem in the setup?

All the best,
Ray

On Sun, Nov 20, 2011 at 12:10 AM, Qinghua Liao <fantasticqhl.gmail.com> wrote:
> Dear amber users,
>
> I did a binding free energy of a ligand to a protein using mm_pbsa.pl, here
> is the result:
>
> #                    DELTA
> #          -----------------------
> #                  MEAN        STD
> #          =======================
> ELE              -67.88       7.84
> VDW             -66.86       3.92
> INT                -0.00       0.00
> GAS             -134.74       8.89
> PBSUR            -57.52       1.98
> PBCAL            115.17       9.15
> PBSOL             57.64       9.07
> PBELE             47.29       8.98
> PBTOT            -77.10       9.24
> GBSUR             -9.67       0.33
> GB                 160.07      21.87
> GBSOL            150.40      21.87
> GBELE             92.20      22.30
> GBTOT             15.66      22.00
>
> I am wondering why PBTOT can be -77.10 while GBTOT be 15.66, I think it
> does not make sense. So how should I explain such a situation? Thanks very
> muc!
> --
> Best Regards,
>
> Qinghua
> Ph.D. student
> Juelich Research Center
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>

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Received on Sun Nov 20 2011 - 07:30:03 PST
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