PDB file 1TBE

This file depicts a dimer of ubiquitin. This structure was solved by W. J. Cook, L. C. Jeffrey, E. Kasperek, & C. M. Pickart in 1994. 

Suggested display options:

Select protein, display as cartoon and color structure. 
What is the predominant secondary structure of this small protein?

Type in select Lys48, display as spacefill, and color CPK.
What amino acid in the adjacent ubiquitin is involved in an isopeptide bond with the side-chain amino group of Lys48?
Change the display of this amino acid and observe the isopeptide bond linking the 2 ubiquitins.

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