Research Project
Grant-in-Aid for Young Scientists (A)
Protein ubiquitylation is an essential post-translational modification responsible for targeted protein degradation, cellular signaling activation, DNA damage response, and protein trafficking. Deubiquitylating enzymes (DUBs) functions as an eraser of the ubiquitin signals by removing ubiquitin(s) from the ubiquitylated proteins. Despite of their importance, biological significance of DUBs poorly understood. To test enzymatic properties of DUBs, we expressed and purified yeast 20 DUBs by a wheat germ expression system. Although most DUBs did not have chain-type specificities, we found that four DUBs can cleave a ubiquitin precursor Ubi4. Among the proteasomal DUBs, consistently with previous studies, Rpn11 is essential for degradation of the ubiquitinated substrate whereas Ubp6 has an inhibitory effect for the substrate degradation in vitro. However, both DUBs can cleave both K48- and K63-linked ubiquitin chains, suggesting that other factors might specify the proteasomal degradation signal. We also found that Ubp6 facilitates proteasomal assembly by clearing ubiquitylated substrates from assembly precursors by its deubiquitylating activity. Furthermore, we applied parallel reaction monitoring (PRM) method to quantify the ubiquitin chains and analyzed DUB mutants.
All 2013 2012 2011 2010 Other
All Journal Article (23 results) (of which Peer Reviewed: 23 results) Presentation (36 results) (of which Invited: 3 results) Book (13 results) Remarks (4 results)
Biochem. Biophys. Res. Commun
Volume: (in press)
Biochem. Biophys. Res. Commun.
Volume: XXX
J. Biol. Chem
Volume: 287 Pages: 12172-12182
Cell
Volume: 150 Pages: 151-164
Bioorg. Med. Chem
Volume: 20 Pages: 4437-4442
Sect. F. Struct. Biol. Cryst. Commun
Volume: 68 Pages: 517-521
Volume: 423 Pages: 122-127
Proc. Natl. Acad. Sci. USA
Volume: 109 Pages: 1479-1484
Volume: 423 Issue: 1 Pages: 122-127
10.1016/j.bbrc.2012.05.093
Proc. Natl. Acad. Sci. USA.
Volume: 109 Issue: 5 Pages: 1479-1484
10.1073/pnas.1119394109
Proc Natl Acad Sci USA
J Biol Chem
Biol Chem
Volume: 393 Pages: 217-234
Mol Cell
Volume: 42 Pages: 637-649
Nature
Volume: 471 Pages: 633-636
Mol.Cell
Volume: (印刷中)
Volume: 107 Pages: 15856-15861
Volume: 396 Pages: 1048-1053
Volume: 285 Pages: 15159-15166
J.Biol.Chem.
Biochem.Biophys.Res.Commun.
Proc.Natl.Acad.Sci.USA.
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