2r2y: Difference between revisions
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{{STRUCTURE_2r2y| PDB=2r2y | SCENE= }} | {{STRUCTURE_2r2y| PDB=2r2y | SCENE= }} | ||
'''Crystal structure of the proteasomal | '''Crystal structure of the proteasomal Rpn13 PRU-domain''' | ||
==Overview== | |||
Targeted protein degradation is largely performed by the ubiquitin-proteasome pathway, in which substrate proteins are marked by covalently attached ubiquitin chains that mediate recognition by the proteasome. It is currently unclear how the proteasome recognizes its substrates, as the only established ubiquitin receptor intrinsic to the proteasome is Rpn10/S5a (ref. 1), which is not essential for ubiquitin-mediated protein degradation in budding yeast. In the accompanying manuscript we report that Rpn13 (refs 3-7), a component of the nine-subunit proteasome base, functions as a ubiquitin receptor, complementing its known role in docking de-ubiquitinating enzyme Uch37/UCHL5 (refs 4-6) to the proteasome. Here we merge crystallography and NMR data to describe the ubiquitin-binding mechanism of Rpn13. We determine the structure of Rpn13 alone and complexed with ubiquitin. The co-complex reveals a novel ubiquitin-binding mode in which loops rather than secondary structural elements are used to capture ubiquitin. Further support for the role of Rpn13 as a proteasomal ubiquitin receptor is demonstrated by its ability to bind ubiquitin and proteasome subunit Rpn2/S1 simultaneously. Finally, we provide a model structure of Rpn13 complexed to diubiquitin, which provides insights into how Rpn13 as a ubiquitin receptor is coupled to substrate deubiquitination by Uch37. | |||
==About this Structure== | ==About this Structure== | ||
2R2Y is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2R2Y OCA]. | 2R2Y is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2R2Y OCA]. | ||
==Reference== | |||
Ubiquitin docking at the proteasome through a novel pleckstrin-homology domain interaction., Schreiner P, Chen X, Husnjak K, Randles L, Zhang N, Elsasser S, Finley D, Dikic I, Walters KJ, Groll M, Nature. 2008 May 22;453(7194):548-52. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/18497827 18497827] | |||
[[Category: Mus musculus]] | [[Category: Mus musculus]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: Ubiquitin]] | [[Category: Ubiquitin]] | ||
[[Category: Ubiquitin-proteasome-degradation pathway]] | [[Category: Ubiquitin-proteasome-degradation pathway]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jun 4 09:58:53 2008'' | ||
