Abstract
A hallmark of small ubiquitin-related modifier (SUMO) is the production of a C-terminal tail containing diglycines (GGs), which are believed to be required for SUMOylation. Whether GGs are required components in SUMOylation remains unanswered experimentally. In this study we found that the SUMO-1/3-AA/-GS/-GN/-GA mutant can form sodium dodecyl sulfate (SDS)-dithiothreitol (DTT)-resistant complexes with cellular proteins, indicating that the GG motif is not strictly required for SUMOylation.
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