AMBER Archive (2008)

Subject: AMBER: ligand slips out of pocket

From: Hannes Wallnoefer (Hannes.Wallnoefer_at_uibk.ac.at)
Date: Fri Apr 04 2008 - 02:58:29 CDT


Hi,

Im modeling a complex with ligand who has two main interaction points. The
first is a cation-pi interaction and the second is a halogen-aromatic
interaction. When running MD Simulation (i used resp HF/6-31G* for the
electrostatic parametrization of the ligand) with Amber 9 my ligand always
"slips" out of the binding pocket. I tried several extensive minimizations and
several ways to equilibrate the system, but nothing fixed the problem. My
question is: Is there another description of the mentioned interaction despite
the coulomb term in the forcefield? And if no, whats the best way to add them
(possibly a distance restraint, but how can I represent the energetic situation
best?)?

Thanks in advance,
Hannes
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