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Papers In Press, published online ahead of print November 20, 2001
Experimental Immunology Branch, National Cancer Institute/NIH, Bethesda, MD 20892-1360
Corresponding Author: mk16m{at}nih.gov
Nedd4 is a HECT domain containing ubiquitin ligase that mediates ubiquitylation and proteasome degradation of target proteins. The molecular basis for the interaction of Nedd4 with substrates lies in its WW domains, which can bind proline-rich (PY) domains in target proteins. Nedd4 is a developmentally expressed protein and may have a fundamental role to play in embryonic processes. However, whether Nedd4 has such a function is currently unknown, in part because no developmentally regulated ubiquitylation substrates have been identified or characterized. We have carried out a yeast two-hybrid screen and identified four proteins expressed in the mid-gestation embryo that are able to interact with Nedd4. Characterization of their functional interaction with Nedd4 in vitro and in vivo demonstrated that three of the four are bona fide Nedd4 binding partners, and two have the capacity to be ubiquitylation substrates. One of these is the first identified non-viral substrate for Nedd4-mediated monoubiquitylation. Interestingly, neither of these two ubiquitylated proteins interacts with Nedd4 through PY mediated mechanisms. For one of the three Nedd4 binding partners there was no discernable evidence of ubiquitylation. However, this protein clearly associates with Nedd4 through its PY domains and can alter the location of Nedd4 in cells, suggesting a role other than as a ubiquitylation substrate.
J. Biol. Chem, 10.1074/jbc.M110047200
Submitted on October 17, 2001
Revised on November 20, 2001
Accepted on November 19, 2001
Identification of developmentally expressed proteins that functionally interact with Nedd4 ubiquitin ligase
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