Uwe,

> We plan a research project where we want to stepwise incorporate
D-amino
> acids into a peptide. To determine the exchanges it would be very
useful
> if
> PyMol could assist.
> If I might dream I would like to have D-amino acids (and maybe other
un-
> usual amino acids) available in the mutation-tool; 

You can flip residue 5 from L to D with the following two commands

edit 5/ca
invert 5/n, 5/c

> some simple energy
> minimization / bond relaxation; storing the resulting molecule in PDB-
> format.

Sculpting can relax VDW/bond/angle strain, but it is not energy
minimization by any means.

> Can I hope ? Is this something others find useful as well ?

We'd all like to see a real forcefield in PyMOL, but no one has written
the code yet.  

Cheers,
Warren




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