Hi
I am following a paper "Development of CHARMM-Compatible Force-Field Parameters for Cobalamin and Related Cofactors from Quantum Mechanical Calculations". In this paper they used charmm force field parameter.
can you help me how can I convert the parameter?
I would rather suggest to use acpype.py python script instead. As doing that may distort the actual bonds, angles, and dihedrals.
They derived parameters through FFTK , charmm compatible force field parameter.
You should be able to use CHAMBER tool within amber to convert any namd compatible files to amber format.
There are differences in the force field equation for CHARMM and AMBER. First check out the differences between the force field equations. And then you can modify the parameters for each atom type.
As the previous poster noted, the CHARMM and AMBER force fields are not simply scaled versions of one another. Each treats the non-bonded interactions quite differently. If your reference has developed the CHARMM parameterization for a molecule that interests you, I fear that will have little benefit for you if your modelling involves the AMBER force fields. So, you will have to learn how the AMBER force fields are created and ask the authors of the reference if they would share their computational results (if you don't want to just repeat their calculations). Then you will have to construct the AMBER parameters for your molecule of interest.
Force field development is quite involved and not well automated. If your Honda breaks down, it does little good if a friend tells you that you can have the transmission from this old Fiat he has. The two pieces of machinery perform the same task but are not interchangeable. So, alas, is the situation with the different flavors of force fields.
I would rather suggest to use acpype.py python script instead. As doing that may distort the actual bonds, angles, and dihedrals.
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