Thank you. I have found a tutorial and I will try to derive them.

On 19 September 2016 at 00:40, Justin Lemkul <jalem...@vt.edu> wrote:

>
>
> On 9/18/16 3:37 AM, Dd H wrote:
>
>> Hi everyone,
>> I want to simulate a protein-ligand complex. The ligand is a GppNHp
>> molecule and an analogue of GTP. I cannot find parameters of GppNHp in
>> AMBER parameter database (parameters of GTP are supplied there). Can you
>> tell me how to get the parameters of GppNHp? Thank you in advance!
>>
>>
> Derive them in a manner consistent with the parent AMBER force field.
> There are lots of ways to start going about this, e.g. online servers,
> GAFF, antechamber, etc.
>
> -Justin
>
> --
> ==================================================
>
> Justin A. Lemkul, Ph.D.
> Ruth L. Kirschstein NRSA Postdoctoral Fellow
>
> Department of Pharmaceutical Sciences
> School of Pharmacy
> Health Sciences Facility II, Room 629
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>
> jalem...@outerbanks.umaryland.edu | (410) 706-7441
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