[gmx-users] combining gromos96 (43a2) and berger lipid force field

2007-11-07 Thread maria goranovic
I want to use the gromos96 force field for the protein, and Tieleman's
Berger force field for the lipids. How do I combine force fields or
construct a topology. I have different topologies for the lipids and
the protein ready. However combining them would probably lead to
errors as I cannot include both the ffG43a2 and the ffgmx force fields
in the same topology ?


Thanks for the help,

-Maria

-- 
Maria G.
Technical University of Denmark
Copenhagen
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Re: [gmx-users] combining gromos96 (43a2) and berger lipid force field

2007-11-07 Thread Alan Dodd
The quick answer would be to look at the ffgmx forcefield, and the ffgmx/Berger 
hybrid that can be obtained (either from Tieleman or the Gromacs website, I 
forget) and work out how the former was incorporated into the latter.  Then 
replicate that for ffG43a2.
Not necessarily simple or even valid, but that's MD for you.

- Original Message 
From: maria goranovic [EMAIL PROTECTED]
To: gmx-users@gromacs.org
Sent: Wednesday, November 7, 2007 7:24:11 PM
Subject: [gmx-users] combining gromos96 (43a2) and berger lipid force field

I want to use the gromos96 force field for the protein, and Tieleman's
Berger force field for the lipids. How do I combine force fields or
construct a topology. I have different topologies for the lipids and
the protein ready. However combining them would probably lead to
errors as I cannot include both the ffG43a2 and the ffgmx force fields
in the same topology ?


Thanks for the help,

-Maria

-- 
Maria G.
Technical University of Denmark
Copenhagen
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Re: [gmx-users] combining gromos96 (43a2) and berger lipid force field

2007-11-07 Thread Mark Abraham

maria goranovic wrote:

I want to use the gromos96 force field for the protein, and Tieleman's
Berger force field for the lipids. How do I combine force fields or
construct a topology. I have different topologies for the lipids and
the protein ready. However combining them would probably lead to
errors as I cannot include both the ffG43a2 and the ffgmx force fields
in the same topology ?


See http://wiki.gromacs.org/index.php/Force_Fields

Since you've only recently chosen gromos96, how about instead choosing a 
forcefield for which lipid parameters have been developed in concert? 
See the literature for ideas on what works here.


Mark
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