On 4/16/13 9:07 AM, Group Gro wrote:
Dear GROMACS users,
Hi.
I want to study different protein-drug complexes and I follow the procedure 
mentioned in the 
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin/gmx-tutorials/complex/.
 I copied and pasted the positions of each drug to the end of conf.gro and did 
other steps. Is this approach true while I don't know the best place to dock 
it?If not, how can I add drug without using Autodock, Gold, or other docking 
softwares? Doeas each drug find the best place to dock?


The approach of copying and pasting coordinates assumes you believe that those coordinates are a realistic representation (i.e. from docking or crystallography). If you just place the molecule in some random way, there's no telling if it's right. The starting position will heavily bias the outcome. If you're not sure, invest some time in learning docking.

My next question is this: When I have different drugs and consider each complex 
of them separately, what factor(s) should be my criteria to find the best drug 
which has the highest effect on the protein (each drug has different nubmer of 
atoms)?

I would suggest you consult the literature here and make an assessment based on what you know about your particular protein. There is no catch-all answer. Binding free energy may be useful, but that's just a generic answer with no knowledge of what you're trying to do.

-Justin

--
========================================

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

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