[gmx-users] Understanding about OPLS-aa for lipids

[Mark Abraham]

minnale wrote:
>  
> Hi all,
> I am new to gromacs, I wanted to use OPLS-aa forcefield for both lipid 
> and protein. I have checked in archives regarding this problem and found 
> link. That means the steps given are opls-aa ff for lipid? or ffgmx ff 
> for lipids are just changing parameters by adding sigma and epsilon 
> values for compatible to protein opls-aa ff

I can't suggest anything because I don't understand what you're asking. 
However you should probably start with some background reading - e.g. 
http://wiki.gromacs.org/index.php/Force_Fields

Mark