How can I compute energy from a protein PDB file?

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TL;DR
Suppose I have a protein PDB file and want to compute energy using the following formula from the coordinates in the file.

**How can I do that?**
Suppose I have a protein PDB file and want to compute energy using the following formula from the coordinates in that file.

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How can I do that?

Sometimes people suggest using the `CONECT` field for that purpose. However, some PDB files do not have this field.

Example: 4OSK.pdb (Crystal structure of TAL effector reveals the recognition between asparagine and guanine)