[gmx-users] lipid problem

[Haberl Florian]

hi

> Hi all!
>
> I just started learning gromacs.  I need to simulate a GPCR in a lipid
> membrane.
>
> I did all the examples at your site, but still  have a problem:
>
> At first I want to try simulating rhodopsin in a membrane.
>
>       - I have  one pdb file with rhodopsin and some lipids and water
> after a MD simulation in NAMD (so all the coordinates are there) (I
> want to try it as a example)
>
> -         I did the topology file and coordinate file for the protein
> separately.
>
> -         I did the topology file for  one  lipid separately and every
> thing seems fine. (prodrg)
>
> -         I did coordinate file for one lipid separately. (prodrg)
>
> My question is:
>
> How can I combine protein and lipids and generate one *.gro  (coordinate
> file) for my whole system.
>
> How can I use my pdb file where I got all the coordinates for the system.
>
> Should I treat every lipid as a separate molecule or as a solvent.
>
> I would appreciate if you could give me some suggestions what should  I do
> next.  Thank you in advance.

i think you are searching for this

 mdrun modified to make a hole in a lipid bilayer
A modified version of mdrun that can be used to make a hole in a lipid
bilayer that is the right shape to drop in the membrane protein of your
choice. It does this by reading a molecular surface file made by Grasp or
MSMS. It can also make a cylindrical hole. Tar file contains
documentation.
Uploaded 15:19 October 15, 2002 by Graham R. Smith (smithgr at cancer.org.uk)
File: mdrun_make_hole.tar.gz (56919 bytes)


which can be found on http://www.gromacs.org/contributions/index.php

Greetings,

Florian

------------------------------------------------------------------------
 Florian Haberl              Universitaet Erlangen/Nuernberg
 Computer-Chemie-Centrum     Naegelsbachstr. 25, D-91052 Erlangen

 Mailto: florian.haberl AT chemie.uni-erlangen.de

------------------------------------------------------------------------