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Spatially regulated ubiquitin ligation by an ER/nuclear membrane ligase

Nature volume 443, pages 827831 (19 October 2006) | Download Citation

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Abstract

The ubiquitin system targets many cellular proteins. Doa10 (also known as Ssm4), a yeast transmembrane ubiquitin ligase (E3), resides in the endoplasmic reticulum (ER), but it attaches ubiquitin to soluble proteins that concentrate in the nucleus. A central question is how nuclear substrates gain access to an enzyme in the ER. Here we show that Doa10 reaches the inner nuclear membrane. A subcomplex of nuclear pore subunits is important for this transport. Notably, another ER transmembrane E3, Hrd1 (also known as Der3), cannot localize efficiently to the inner nuclear membrane. Tethering Doa10 at the cell periphery inhibits degradation of soluble nuclear substrates but not cytoplasmic ones. If Doa10 is released from these peripheral sites, localization of Doa10 to the nuclear envelope and degradation of its nuclear substrates are restored in parallel. Thus, localization of Doa10 to the inner nuclear membrane is necessary for nuclear substrate degradation. These data indicate that different membrane ubiquitin ligases are spatially sorted within the ER–nuclear envelope membrane system and that this differential localization contributes to their specificity.

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Acknowledgements

We thank R. Sternglanz and R. Wozniak for strains and plasmids, P. Crews for generously providing LTA, O. Kerscher for Supplementary Fig. 1, and J. Wu and J. Wolenski for advice on confocal microscopy. We are grateful to S. Kreft, A. Lewis and T. Ravid for comments on the manuscript. This work was supported by the NIH. Author Contributions M.D. performed all the experiments, and M.D. and M.H. planned the experiments, performed the data analysis and wrote the paper.

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  1. Yale University, Department of Molecular Biophysics and Biochemistry, 266 Whitney Avenue, P.O. Box 208114, New Haven, Connecticut 06520-8114, USA

    • Min Deng
    •  & Mark Hochstrasser

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Reprints and permissions information is available at www.nature.com/reprints. The authors declare no competing financial interests.

Corresponding author

Correspondence to Mark Hochstrasser.

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https://doi.org/10.1038/nature05170

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