[gmx-users] How to install a new force-field?

ZHANG Cheng 272699575 at qq.com
Sun Dec 23 15:39:11 CET 2018

Dear Gromacs users,

In the pdb2gmx command, we are asked to select the force field to simulate our protein system. I am told that a99SB-disp and CHARMM36m are better force-field for the proteins. But both of them are not the default ones. Can I ask

1) What is the latest officical website to download them?
At this website,
I could not find a99SB-disp and CHARMM36m.

2) How to install them?
Is there a step-by-step instruction for the installation?

Thank you.

Yours sincerely

CHARMM36m: an improved force field for folded and intrinsically disordered proteins

Developing a molecular dynamics force field for both folded and disordered protein states

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