Adding Copper into CHARMM ff

GROMACS version:
GROMACS modification: Yes/No

Hi everyone,

I want to parametized copper complex using CHARMM force field using cgenff server. However, there is error in output file as below. May I know any other way to solve this problem aside from using Amber force field?

  • Toppar stream file generated by
  • CHARMM General Force Field (CGenFF) program version 2.5
  • For use with CGenFF version 4.6

read rtf card append

  • Topologies generated by
  • CHARMM General Force Field (CGenFF) program version 2.5

36 1

! “penalty” is the highest penalty score of the associated parameters.
! Penalties lower than 10 indicate the analogy is fair; penalties between 10
! and 50 mean some basic validation is recommended; penalties higher than
! 50 indicate poor analogy and mandate extensive validation/optimization.

RESI UNL 0.000 ! param penalty= 0.000 ; charge penalty= 0.000
GROUP ! CHARGE CH_PENALTY
ATOM CU DUM 0.000 ! 0.000! typer WARNING: dummy atom not explicitly supported

END

read param card flex append

  • Parameters generated by analogy by
  • CHARMM General Force Field (CGenFF) program version 2.5

! Penalties lower than 10 indicate the analogy is fair; penalties between 10
! and 50 mean some basic validation is recommended; penalties higher than
! 50 indicate poor analogy and mandate extensive validation/optimization.

BONDS

ANGLES

DIHEDRALS

IMPROPERS

END
RETURN