AMBER: Abnormality in MM-PBSA result

From: <msubhamoy.ibab.ac.in>
Date: Fri, 19 Oct 2007 20:31:16 +0530 (IST)

Respected Sir

I just want to know the reason of this abnormality. I have calculated the
binding free energy of
A-U (10 mers) and have got some abnormal results.

One would typically expect to find an extremely favourable electrostatic energy
and a dis-avourable solvation free energy. This symbolises the energy that ones
has to use to de-solvate the binding particles and to align their binding
interfaces.

But in my case its opposite? why is it so? Is it normal? or is it becoz of some
error I have made.


 MY REULTS

# DELTA
# -----------------------
# MEAN STD
# =======================
ELE 4676.18 84.25
VDW -106.62 6.41
INT 0.00 0.00
GAS 4569.56 84.90
PBSUR -13.15 0.34
PBCAL -4652.66 82.89
PBSOL -4665.81 82.77
PBELE 23.52 7.85
PBTOT -96.25 6.01
GBSUR -13.15 0.34
GB -4615.11 83.56
GBSOL -4628.26 83.44
GBELE 61.07 7.06
GBTOT -58.70 5.07

Here ELE component is positive where as PBCAL is negative . Why?

                                                                        s.mukerjee


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Received on Sun Oct 21 2007 - 06:07:49 PDT
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