[gmx-users] how to build a mixed lipid bilayer?

[Jianguo Li]

There are several ways, usually I do like the following:
1. first construct one leaflet. Use "editconf -translate" to construct a small box containing with 3 POPE 1 POPE

2. Use "genconf -nbox" to replicate the above in x,y dimension to get 64 lipids

3. Use "editconf -rotate -translate" to get the another leaflet with 64 lipids

4. Use "cat" to conbine the two leaflet
5. Use "grep" and "cat" commands to re-order the lipids.

6. Change the z dimension of the box. Also change vdwradii.dat and solvate the system and add counter ions. 

After that run a long simulation to equilibrate the system.


btw, which force field you want? If you use gromos force field, you can download the itp and pdb files from http://www.softsimu.net/downloads.shtml

If you want CHARMM36, I can send you the files.

-Jianguo


________________________________
From: xi zhao <zhaoxiitc2002 at yahoo.com.cn>
To: gmx-users at gromacs.org 
Sent: Sunday, 29 July 2012, 9:19
Subject: [gmx-users] how to build a mixed lipid bilayer?

Dear Users:
I would like to build a mixed lipid bilayer (POPE/POPG=3:1) in the MD using Gromacs, please provide some tools for producing the structures or existing structures (PDB or gro files).

  Thank you very much!



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