dihed

 NAME
dihed – Define proper torsions list for the residue. Obsolete Unsupported

 SYNOPSIS
dihed
...
lab1 lab2 lab3 lab4    lab5 lab6 lab7 lab8 ...
...
end

 DESCRIPTION
In more modern biomolecular force fields all possible torsion angles are included in the interaction potential (see AUTO_DIHEDRAL of the environment &SOLUTE). dihed includes only selected proper torsions in the potential as it was required by earlier force fields. Each proper torsion is defined by a quadruplet of atom labels (see synopsis). Labels starting with a - or a + refer to atoms belonging to the preceding and following residue in the solute sequence.

 EXAMPLES

dihed
-c n ca cb    n ca cb cg1   n ca c +n
end

 WARNINGS
The keyword bonds must appear before dihed. If AUTO_DIHEDRAL of the environment &SOLUTE is selected, the keyword dihed has no effect.