Re: AMBER: about QMMM output

From: Gustavo Seabra <>
Date: Fri, 4 Jul 2008 11:33:06 -0400

Yes and no ;-)

That is the SCF energy, the energy from the QM calculation. This
energy is influenced by the presence of the MM atoms, so in a way you
can say it does include /some/ of the QM/MM electrostatic interaction
energy. However, the QM/MM interaction also has other terms, like van
der Waals and bond terms, which are not included there.

For more details, see:
J. Phys. Chem. A (2007), 111, 5655-5664
J Comput Chem (2008), 29 10191031


On Thu, Jul 3, 2008 at 10:40 PM, linfu <> wrote:
> Dear AMBER community!
> I have question about QMMM output. for example QM part use PM3
> In the output there is a energy term called PM3ESCF.
> Does PM3ESCF(ligand) = E<QM(ligand)>+E<QM(ligand)/MM(water+protein)> ?
> if the ligand has no covalent bond with protein and QM part is ligand.
> Thank you in advance!
> Best Regards,
> Lin
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Received on Sun Jul 06 2008 - 06:07:48 PDT
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