Reference: Gong L and Yeh ET (1999) Identification of the activating and conjugating enzymes of the NEDD8 conjugation pathway. J Biol Chem 274(17):12036-42

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Abstract


NEDD8 is a ubiquitin-like molecule that can be covalently conjugated to a limited number of cellular proteins, such as Cdc53/cullin. We have previously reported that the C terminus of NEDD8 is efficiently processed to expose Gly-76, which is required for conjugation to target proteins. A combination of data base searches and polymerase chain reaction cloning was used to identify a cDNA encoding human UBA3, which is 38% identical to the yeast homologue, 22% identical to human UBA2, and 19% identical to the C-terminal region of human UBE1. The human UBA3 gene is located on chromosome 3p13 and gave rise to a 2.2-kilobase pair transcript that was detected in all tissues. Human UBA3 could be precipitated with glutathione S-transferase (GST)-NEDD8, but not with GST-ubiquitin or GST-sentrin-1. Moreover, human UBA3 could form a beta-mercaptoethanol-sensitive conjugate with NEDD8 in the presence of APP-BP1, a protein with sequence homology to the N-terminal half of ubiquitin-activating enzyme. We have also cloned human UBC12 and demonstrated that it could form a thiol ester linkage with NEDD8 in the presence of the activating enzyme complex. Identification of the activating and conjugating enzymes of the NEDD8 conjugation pathway should allow for a more detailed study of the role of NEDD8 modification in health and disease.

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Journal Article | Research Support, Non-U.S. Gov't | Research Support, U.S. Gov't, P.H.S.
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Gong L, Yeh ET
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