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. Author manuscript; available in PMC: 2017 Aug 3.
Published in final edited form as: J Chem Theory Comput. 2017 May 17;13(6):2418–2429. doi: 10.1021/acs.jctc.7b00059

Figure 1.

Figure 1

Crystal structure of ubiquitin monomer (PDB: 1UBQ).36 Shown in sticks are the five lysine sites presented in this study. Other potential linkage sites exist but are not shown (M1, K27, and K33). The C-terminus (“C-term”) of one ubiquitin monomer forms an isopeptide or thiolene linkage with the amino group at one of these sites.