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This command reads the parameters from the parameter library given by file, such as the CHARMM 22 parameter file for proteins with all atoms [MacKerell et al., 1998]. The parameters are added to any already in memory. This file contains the values for bond lengths, angles, dihedral angles, improper dihedral angles, and non-bonded interactions. MODELLER relies on slightly modified CHARMM-22 parameters to reproduce the protein geometry in the MODELLER environment. For example, for the default non-hydrogen atoms model, the ω dihedral angle restraints are stronger than the original CHARMM 22 values which apply to the all-hydrogen model. For a sparse discussion of the parameter library, see the FAQ Section 3.1, Question 8.
Note that, in contrast to older versions of MODELLER, the non-bonded spline parameters used in loop modeling are not read by this function. See instead the documentation for the separate GroupRestraints class, in section 6.13, for more information.
file can be a filename or a readable file handle (see modfile.File()).
Example: See Model.patch() command.