User guide

2. Using the solid-bond tool, drag from the lower chain's Gly-3 to the upper chain's Arg-3. The terminal hydrogen on
the lower chain is removed and the branched peptide appears as:
If the residues does not have leaving groups that can be automatically found, the Modify nickname dialog appears and
you need to manually define the third attachment point. Consider the following example,
1. Draw two biopolymer chains as shown below:
2. Using the solid-bond tool, drag from the lower chain's Met-4 to the upper chain's Met-5. Since neither of these res-
idues have defined leaving groups, the Modify Nickname dialog appears twice, once for each residue.
3. Define new attachment points. The resulting structure is:
Disulfide bridges
You can be build disulfide bridges either between Cys residues within the same structure, or between residues in two
different structures. For example, consider the endocrine hormone Insulin.
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Chapter 5: Drawing biopolymers 74 of 401