Abstract
The UBA domain is a motif found in a variety of proteins, some of which are associated with the ubiquitin–proteasome system1,2. 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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Acknowledgements
We thank W. Dubiel and K. Ferrell for advice and help with multi-ubiquitin binding experiments; C. Landgraf and R. Volkmer-Engert for advice on the BIAcore experiments; R. Layfield for advice on using the anti-ubiquitin antibody for western blot analysis; S. Moreno for the anti-Rum1 antibody; P. McLaughlin for spotting the homology between the Mud1 protein and the aspartate protease; C. Pickart for providing lysine-48-linked multi-ubiquitin chains and for comments on the manuscript; P. Perry for advice on microscopy; S. Bruce, D. Stuart and N. Davidson for photography; and K. Hendil and N. Hastie for advice, encouragement and comments on the manuscript. This work was supported by Medical Research Council funding (to C.G.), the Danish Research Academy (to R.H.-P.) and the Deutsche Forschungsgemeinschaft (to M.S.).
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Figure S1 Proteins in fission yeast containing a UBA domain. (PDF 23 kb)
Figure S2 Surface plasmon resonance measurements of Mud1 binding to tetra-ubiquitin.
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Wilkinson, C., Seeger, M., Hartmann-Petersen, R. et al. Proteins containing the UBA domain are able to bind to multi-ubiquitin chains. Nat Cell Biol 3, 939–943 (2001). https://doi.org/10.1038/ncb1001-939
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DOI: https://doi.org/10.1038/ncb1001-939
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