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Modification of proteins by the addition of lysine (K)-63-linked polyubiquitin (polyUb) chains is suggested to play important roles in a variety of cellular events, including DNA repair, signal transduction, and receptor endocytosis. However, identifying such modifications in living cells is complex and cumbersome. We have generated a monoclonal antibody (mAb) that specifically recognizes K63-linked polyUb, but not any other isopeptide-linked (K6, K11, K27, K29, K33, or K48) polyUb or monoubiquitin. We demonstrate the sensitivity and specificity of this K63Ub-specific mAb to detect K63Ub-modified proteins in cell lysates by Western blotting and in cells by immunofluorescence, and K63Ub-modified TRAF6 and MEKK1 in vitro and ex vivo. This unique mAb will facilitate the analysis of K63-linked polyubiquitylation ex vivo and presents a strategy for the generation of similar reagents against other forms of polyUb.

Analysis of nondegradative protein ubiquitylation with a monoclonal antibody specific for lysine-63-linked polyubiquitin