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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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A transmembrane ubiquitin ligase required to sort membrane proteins into multivesicular bodies.

Membrane proteins with transmembrane domains (TMDs) that contain polar residues exposed to the lipid bilayer are selectively sorted into multivesicular bodies (MVBs) and delivered to the yeast vacuole. Sorting of some, although not all, proteins into these structures is mediated by ubiquitination. We have identified a transmembrane ubiquitin ligase, Tul1, that is resident in the Golgi apparatus and is required for the ubiquitination of proteins with polar TMDs, including vacuolar proteins such as carboxypeptidase S. We suggest that Tul1 provides quality control, identifying misfolded membrane proteins and marking them for transport to endosomes and degradation in the vacuole.[1]

References

  1. A transmembrane ubiquitin ligase required to sort membrane proteins into multivesicular bodies. Reggiori, F., Pelham, H.R. Nat. Cell Biol. (2002) [Pubmed]
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