Structural highlights
Function
[UBP14_HUMAN] Proteasome-associated deubiquitinase which releases ubiquitin from the proteasome targeted ubiquitinated proteins. Ensures the regeneration of ubiquitin at the proteasome. Is a reversibly associated subunit of the proteasome and a large fraction of proteasome-free protein exists within the cell. Required for the degradation of the chemokine receptor CXCR4 which is critical for CXCL12-induced cell chemotaxis. Serves also as a physiological inhibitor of endoplasmic reticulum-associated degradation (ERAD) under the non-stressed condition by inhibiting the degradation of unfolded endoplasmic reticulum proteins via interaction with ERN1. Indispensable for synaptic development and function at neuromuscular junctions (NMJs).[1] [2] [3]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
The ubiquitin-specific processing protease (UBP) family of deubiquitinating enzymes plays an essential role in numerous cellular processes. Mammalian USP14 (Ubp6 in yeast) is unique among known UBP enzymes in that it is activated catalytically upon specific association with the 26S proteasome. Here, we report the crystal structures of the 45-kDa catalytic domain of USP14 in isolation and in a complex with ubiquitin aldehyde, which reveal distinct structural features. In the absence of ubiquitin binding, the catalytic cleft leading to the active site of USP14 is blocked by two surface loops. Binding by ubiquitin induces a significant conformational change that translocates the two surface loops thereby allowing access of the ubiquitin C-terminus to the active site. These structural observations, in conjunction with biochemical characterization, identify important regulatory mechanisms for USP14.
Structure and mechanisms of the proteasome-associated deubiquitinating enzyme USP14.,Hu M, Li P, Song L, Jeffrey PD, Chenova TA, Wilkinson KD, Cohen RE, Shi Y EMBO J. 2005 Nov 2;24(21):3747-56. Epub 2005 Oct 6. PMID:16211010[4]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Koulich E, Li X, DeMartino GN. Relative structural and functional roles of multiple deubiquitylating proteins associated with mammalian 26S proteasome. Mol Biol Cell. 2008 Mar;19(3):1072-82. Epub 2007 Dec 27. PMID:18162577 doi:http://dx.doi.org/10.1091/mbc.E07-10-1040
- ↑ Nagai A, Kadowaki H, Maruyama T, Takeda K, Nishitoh H, Ichijo H. USP14 inhibits ER-associated degradation via interaction with IRE1alpha. Biochem Biophys Res Commun. 2009 Feb 20;379(4):995-1000. doi:, 10.1016/j.bbrc.2008.12.182. Epub 2009 Jan 9. PMID:19135427 doi:http://dx.doi.org/10.1016/j.bbrc.2008.12.182
- ↑ Mines MA, Goodwin JS, Limbird LE, Cui FF, Fan GH. Deubiquitination of CXCR4 by USP14 is critical for both CXCL12-induced CXCR4 degradation and chemotaxis but not ERK ativation. J Biol Chem. 2009 Feb 27;284(9):5742-52. doi: 10.1074/jbc.M808507200. Epub 2008, Dec 23. PMID:19106094 doi:http://dx.doi.org/10.1074/jbc.M808507200
- ↑ Hu M, Li P, Song L, Jeffrey PD, Chenova TA, Wilkinson KD, Cohen RE, Shi Y. Structure and mechanisms of the proteasome-associated deubiquitinating enzyme USP14. EMBO J. 2005 Nov 2;24(21):3747-56. Epub 2005 Oct 6. PMID:16211010
