[Chimera-users] VL: Minimizing the structure in Chimera

Elaine Meng meng at cgl.ucsf.edu
Wed Jan 31 08:21:00 PST 2018

Dear Elias Veijola,
Sorry, there are only parameters for a certain set of elements.

>From the Minimize Structure manual page:

"Monatomic ions are assigned user-specified net charges and Amber VDW parameters. The following ions are handled: Li+, Na+, K+, Rb+, Cs+, F–, Cl–, Br–, I–, Mg2+, Ca2+, Zn2+. In addition, Fe ion nonbonded parameters are taken from the heme residue in the Amber parameter database. See Limitations for how to add types.”

It is very difficult to try to add parameters yourself, but you take a look at the Limitations section if you want:

If you are not trying to be highly precise or the Ni ion is not near the parts of interest, you could consider text-editing your input file to change it to a different metal (one in the list above) or even delete it entirely.

Best regards,
Elaine C. Meng, Ph.D.                       
UCSF Chimera(X) team
Department of Pharmaceutical Chemistry
University of California, San Francisco

> On Jan 31, 2018, at 2:16 AM, Veijola Elias <elias.veijola at aalto.fi> wrote:
> Dear Mr. or Mrs.
> I am trying to minimize a structure of mutated coEnzyme B but the program gives me this error 
> Element Ni (atom #0:700.A at NI) is not currently supported [no GAFF type]
> Best regards,
> Elias Veijola

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