Structure of the Ubiquitin Hydrolase UCH-L3 Complexed with a Suicide SubstrateMisaghi, S., Galardy, P.J., Meester, W.J.N., Ovaa, H., Ploegh, H.L., Gaudet, R.
(2005) J.Biol.Chem. 280: 1512-1520
- PubMed: 15531586
- DOI: 10.1074/jbc.M410770200
- PubMed Abstract:
- Structural basis for the specificity of ubiquitin C-terminal hydrolases
Johnston, S.C.,Riddle, S.M.,Cohen, R.E.,Hill, C.P.
(1999) Embo J. 18: 3877
- A novel active site-directed probe specific for deubiquitinating enzymes reveals proteasome association of USP14
Borodovsky, A.,Kessler, B.M.,Casagrande, R.,Overkleeft, H.S.,Wilkinson, K.D.,Ploegh, H.L.
(2001) Embo J. 20: 5187
- Crystal structure of a deubiquitinating enzyme (human UCH-L3) at 1.8 A resolution
Johnston, S.C.,Larsen, C.N.,Cook, W.J.,Wilkinson, K.D.,Hill, C.P.
(1997) Embo J. 16: 3787
- Chemistry-based functional proteomics reveals novel members of the deubiquitinating enzyme family
Borodovsky, A.,Ovaa, H.,Kolli, N.,Gan-Erdene, T.,Wilkinson, K.D.,Ploegh, H.L.,Kessler, B.M.
(2002) Chem.Biol. 9: 1149
Ubiquitin C-terminal hydrolases (UCHs) comprise a family of small ubiquitin-specific proteases of uncertain function. Although no cellular substrates have been identified for UCHs, their highly tissue-specific expression patterns and the association ...
Ubiquitin C-terminal hydrolases (UCHs) comprise a family of small ubiquitin-specific proteases of uncertain function. Although no cellular substrates have been identified for UCHs, their highly tissue-specific expression patterns and the association of UCH-L1 mutations with human disease strongly suggest a critical role. The structure of the yeast UCH Yuh1-ubiquitin aldehyde complex identified an active site crossover loop predicted to limit the size of suitable substrates. We report the 1.45 A resolution crystal structure of human UCH-L3 in complex with the inhibitor ubiquitin vinylmethylester, an inhibitor that forms a covalent adduct with the active site cysteine of ubiquitin-specific proteases. This structure confirms the predicted mechanism of the inhibitor and allows the direct comparison of a UCH family enzyme in the free and ligand-bound state. We also show the efficient hydrolysis by human UCH-L3 of a 13-residue peptide in isopeptide linkage with ubiquitin, consistent with considerable flexibility in UCH substrate size. We propose a model for the catalytic cycle of UCH family members which accounts for the hydrolysis of larger ubiquitin conjugates.
Department of Pathology, Harvard Medical School, Boston, Massachusetts 02115, USA.