Journal
NATURE CELL BIOLOGY
Volume 3, Issue 10, Pages 939-943Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncb1001-939
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The UBA domain is a motif found in a variety of proteins, some of which are associated with the ubiquitin-proteasome system(1,2). We describe the isolation of a fission-yeast gene, mud1(+), which encodes a UBA domain containing protein that is able to bind multi-ubiquitin chains. We show that the UBA domain is responsible for this activity. Two other proteins containing this motif, the fission-yeast homologues of Rad23 and Dsk2, are also shown to bind multi-ubiquitin chains via their UBA domains. These two proteins are implicated, along with the fission-yeast Pus1(S5a/Rpn10) subunit of the 26 S proteasome, in the recognition and turnover of substrates by this proteolytic complex.
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