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Structural highlights

Function

UBP8_HUMAN Hydrolase that can remove conjugated ubiquitin from proteins and therefore plays an important regulatory role at the level of protein turnover by preventing degradation. Converts both 'Lys-48' an 'Lys-63'-linked ubiquitin chains. Catalytic activity is enhanced in the M phase. Involved in cell proliferation. Required to enter into S phase in response to serum stimulation. May regulate T-cell anergy mediated by RNF128 via the formation of a complex containing RNF128 and OTUB1. Probably regulates the stability of STAM2 and RASGRF1. Regulates endosomal ubiquitin dynamics, cargo sorting, membrane traffic at early endosomes, and maintenance of ESCRT-0 stability. The level of protein ubiquitination on endosomes is essential for maintaining the morphology of the organelle. Deubiquitinates EPS15 and controles tyrosine kinase stability. Removes conjugated ubiquitin from EGFR thus regulating EGFR degradation and downstream MAPK signaling. Involved in acrosome biogenesis through interaction with the spermatid ESCRT-0 complex and microtubules. Deubiquitinates BIRC6/bruce and KIF23/MKLP1.^{[1] [2] [3] [4]}

References

1. ↑ Naviglio S, Mattecucci C, Matoskova B, Nagase T, Nomura N, Di Fiore PP, Draetta GF. UBPY: a growth-regulated human ubiquitin isopeptidase. EMBO J. 1998 Jun 15;17(12):3241-50. PMID:9628861 doi:http://dx.doi.org/10.1093/emboj/17.12.3241
2. ↑ Row PE, Prior IA, McCullough J, Clague MJ, Urbe S. The ubiquitin isopeptidase UBPY regulates endosomal ubiquitin dynamics and is essential for receptor down-regulation. J Biol Chem. 2006 May 5;281(18):12618-24. Epub 2006 Mar 6. PMID:16520378 doi:http://dx.doi.org/10.1074/jbc.M512615200
3. ↑ Row PE, Liu H, Hayes S, Welchman R, Charalabous P, Hofmann K, Clague MJ, Sanderson CM, Urbe S. The MIT domain of UBPY constitutes a CHMP binding and endosomal localization signal required for efficient epidermal growth factor receptor degradation. J Biol Chem. 2007 Oct 19;282(42):30929-37. Epub 2007 Aug 21. PMID:17711858 doi:http://dx.doi.org/10.1074/jbc.M704009200
4. ↑ Pohl C, Jentsch S. Final stages of cytokinesis and midbody ring formation are controlled by BRUCE. Cell. 2008 Mar 7;132(5):832-45. doi: 10.1016/j.cell.2008.01.012. PMID:18329369 doi:http://dx.doi.org/10.1016/j.cell.2008.01.012