Re: [AMBER] Force field ff99SB*-ILDN request

From: Hannes Loeffler <>
Date: Fri, 12 Sep 2014 16:35:12 +0100

On Fri, 12 Sep 2014 11:16:55 -0400
David A Case <> wrote:

> On Fri, Sep 12, 2014, wrote:
> >
> > After going through the literature I find ff99SB*-ILDN is the one
> > which gives comparable result to the experimental observations.
> Just to add a small note to Jason's excellent reply:
> The types of side-chain torsional modifications that were made in the
> "ILDN" modifications to ff99SB are also present in ff14SB. That is to
> say, the same problems with side-chain behavior (plus some additional
> difficulties with other side chains) have been addressed; the specific
> changes from ff99SB are different. We expect that (like ff99SBildn)
> ff14SB will generally show improved physical fidelity, compared to
> ff99SB.
> For more details, please see the paragraph on "side chain dihedral
> parameters" on p. 31 of the Amber14 Reference Manual.
> Like Jason, I don't know what the "*" means in ff99SB*ildn.

According to this paper
it is a combination of the ff99SB* modifications plus ILDN. The ff99SB*
(and ff03*) parameters are apparently from

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