To make a disulfide bond:
- MolMechanics/Edit Structure/Set Disulfide Bond...
- Click in the "first cys" data entry box and right click on the cys residue or type in the ICM selection language for the first cysteine.
- Click in the "second cys" data entry box and right click on the cys residue ortype in the ICM selection language for the second cysteine.
- Click on the Apply button