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Papers In Press, published online ahead of print June 19, 2003
Cardiology Dept., University of Texas M.D.Anderson Cancer Center, Houston, TX 77030
Corresponding Author: tetsu.kamitani{at}uth.tmc.edu
NEDD8 is a ubiquitin-like protein that controls vital biological events through its conjugation to target proteins. We previously identified a negative regulator of the NEDD8 conjugation system, NUB1, which works by recruiting NEDD8 and its conjugates to the proteasome for degradation. Recently, we found its splicing variant, NUB1L. It possesses an insertion of 14 amino acids that codes for a UBA domain. Structural study revealed that NUB1 has a NEDD8-binding site at the C-terminus, whereas NUB1L has an additional site at the newly generated UBA domain. Interestingly, the sequence A(X4)L(X10)L(X3)L was conserved in these NEDD8-binding sites among human and other mammals. Mutational studies revealed that at least three Leu residues in the conserved sequence are required for the binding with NEDD8. Functional study suggested that the NEDD8-binding ability at the C-terminus of NUB1 and NUB1L is mainly involved in the downregulation of NEDD8, but the NEDD8-binding ability at the UBA2 domain of NUB1L is minimally or not involved at all. The NEDD8-binding ability at the UBA2 domain might be required for an unknown function of NUB1L.
J. Biol. Chem, 10.1074/jbc.M212057200
Submitted on November 26, 2002
Revised on June 19, 2003
Accepted on June 19, 2003
Regulation of NEDD8 conjugation system by a splicing variant, NUB1L
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