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. Author manuscript; available in PMC: 2006 Jan 31.
Published in final edited form as: J Am Chem Soc. 1996 Oct 30;118(43):10640–10644. doi: 10.1021/ja961812r

Figure 5.

Figure 5

Illustration of the proposed salt-bridge between the carboxylate of aspartic acid-52 and the amide nitrogen of the adjacent glycine residue which would facilitate the direct bond cleavage of ubiquitin 11+ to form the y244+/b527+ complementary ions. This salt-bridge could be further stabilized by close interaction with an additional protonated residue such as the side chain of arginine-54.