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- Title
Unconventional tethering of Ulp1 to the transport channel of the nuclear pore complex by karyopherins.
- Authors
Panse, Vikram Govind; Küster, Bernhard; Gerstberger, Thomas; Hurt, Ed
- Abstract
The ubiquitin-like protein SUMO-1 (small ubiquitin-related modifier 1) is covalently attached to substrate proteins by ligases and cleaved by isopeptidases. Yeast has two SUMO-1-deconjugating enzymes, Ulp1 and Ulp2, which are located at nuclear pores and in the nucleoplasm, respectively. Here we show that the catalytic C-domain of Ulp1 must be excluded from the nucleoplasm for cell viability. This is achieved by the noncatalytic N-domain, which tethers Ulp1 to the nuclear pores. The bulk of cellular Ulp1 is not associated with nucleoporins but instead associates with three karyopherins (Pse1, Kap95 and Kap60), in a complex that is not dissociated by RanGTP in vitro. The Ulp1 N-domain has two distinct binding sites for Pse1 and Kap95/Kap60, both of which are required for anchoring to the nuclear pore complex. We propose that Ulp1 is tethered to the nuclear pores by a Ran-insensitive interaction with karyopherins associated with nucleoporins. This location could allow Ulp1 to remove SUMO-1 from sumoylated cargo proteins during their passage through the nuclear pore channel.
- Publication
Nature cell biology, 2003, Vol 5, Issue 1, p21
- ISSN
1465-7392
- Publication type
Journal Article
- DOI
10.1038/ncb893