Abstract
Ubiquitination is one of the most important posttranslational modifications in all eukaryote organisms. Ubiquitin-activating enzyme (E1), ubiquitin-conjugating enzyme (E2), and ubiquitin ligase (E3) are the three key enzymes in this process. To detect the specificity between E2 and E3 or enzyme–substrate relationship between E3 and a substrate protein, ubiquitination activity needs to be determined. This protocol provides a convenient and efficient in vitro assay for DTT-sensitive thioester formation of E2s and Ring/U-box-type E3s, and E3-mediated substrate ubiquitination. E2/E3 specificities can also be investigated quickly by using this system. This method can be applied to ubiquitination assays of proteins from any eukaryotic organisms.
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Acknowledgments
This research was supported by Grant CNSF31030047/90717006 from the National Natural Science Foundation of China and 973 Program 2011CB915402, which is a grant from National Basic Research Program of China. Q.X. is supported by grants from the Chinese Academy of Science.
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Zhao, Q., Liu, L., Xie, Q. (2011). In Vitro Protein Ubiquitination Assay. In: Wang, ZY., Yang, Z. (eds) Plant Signalling Networks. Methods in Molecular Biology, vol 876. Humana Press. https://doi.org/10.1007/978-1-61779-809-2_13
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DOI: https://doi.org/10.1007/978-1-61779-809-2_13
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