On Fri, Oct 23, 2009 at 12:33 AM, XAvier Periole <x.peri...@rug.nl> wrote:

>
> On Oct 22, 2009, at 11:28 PM, Amit Choubey wrote:
>
>
>
> On Thu, Oct 22, 2009 at 9:53 AM, S hv <sola...@hotmail.com> wrote:
>
>>  Hi,
>>
>> I am currently working with peptide/lipids interactions using the martini
>> force field. I want to built a bacterial membrane, so I trying to find the
>> topology of the POPG lipid but until now without success.
>>
>
>
>>
>> In the martini_v2.0_lipids.itp file, the PG lipids are no included. I have
>> seen some works using the martini force field and POPG lipids, e.g., " The
>> molecular mechanism monolayer PNAS 105, 10803-10808", but they don't specify
>> the topology of POPG lipids.
>>
>
>
> You can do this on your own just pull out the atomic structure of DPPC and 
> POPG from any website. Compare atomistic DPPC with the Coarse Grained DPPC 
> and it wont be hard to figure out the POPG CG topology.
>
> That is certainly not that easy. A lot of parameterizations efforts have to
> be
> involved.
>

No, thats easy because you are working with a coarse grained model. There
are are only few types of particles possible. The only tricky ones are the
head groups which the paper does mention.

>
>
> BTW, the paper does give a short description about the topology of POPG
>
> The best is probably to ask the authors of that paper to share their
> topology,
> which they should.
>
>
>
>> I also tried in the martini web page, but I just found the
>> martini_v2.0_lipids.itp file.
>>
>> Could anyone help me to find such topology?
>>
>> Thanks a lot for your time,
>>
>> Salvador
>>
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