Re: [AMBER] Amber99SB force field

From: Shomesankar Bhunia <>
Date: Wed, 9 Oct 2013 07:16:55 +0530

Dear carlos,
I would like to know one thing if I source leaprc.ff99SBildn, how i should
Is it like this? I have followed the amber tutorial

should I also apply leaprc.ff99SBildn in case of ligand also?

tleap -f leaprc.ff99SBildn

>source leaprc.gaff

I am giving you the details.

*for ligand*

antechamber -i sustiva_new.pdb -fi pdb -o sustiva.mol2 -fo mol2 -c bcc -s 2
parmchk -i sustiva.mol2 -f mol2 -o sustiva.frcmod
*$tleap -f leaprc.ff99SB*
*source leaprc.gaff*
SUS = loadmol2 sustiva.mol2
check SUS
loadamberparams sustiva.frcmod
saveoff SUS sus.lib
saveamberparm SUS sustiva.prmtop sustiva.inpcrd

*for pdb + ligand*

*tleap -f leaprc.ff99SB*
*>source leaprc.gaff *
>loadamberparams sustiva.frcmod
loadoff sus.lib
>complex = loadpdb 1FKO_trunc_sus.pdb
>saveamberparm complex 1FKO_sus.prmtop 1FKO_sus.inpcrd
>savepdb complex 1FKO_sus.pdb

Thanks in advance

On Wed, Oct 9, 2013 at 12:31 AM, Shomesankar Bhunia <> wrote:

> Dear Carlos,
> Thank you very much .
> On Tue, Oct 8, 2013 at 11:48 PM, Carlos Simmerling <
>> wrote:
>> this information is on the main web page. look down at the
>> force field section, and check the reference for ff99SBildn
>> _______________________________________________
>> AMBER mailing list
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Received on Tue Oct 08 2013 - 19:00:05 PDT
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