Phosphorylation of USP15 and USP4 Regulates Localization and Spliceosomal Deubiquitination.

Title
Phosphorylation of USP15 and USP4 Regulates Localization and Spliceosomal Deubiquitination.
Authors
김은경타누자다스송은주
Issue Date
2019-09
Publisher
Journal of molecular biology
Citation
VOL 431, NO 19-3912
Abstract
Deubiquitinating enzymes have key roles in diverse cellular processes whose enzymatic activities are regulated by different mechanisms including post-translational modification. Here, we show that USP15 is phosphorylated, and its localization and activity are dependent on the phosphorylation status. Nuclearcytoplasmic fractionation and mass spectrometric analysis revealed that Thr149 and Thr219 of human USP15, which is conserved among different species, are phosphorylated in the cytoplasm. The phosphorylation status of USP15 at these two positions alters the interaction with its partner protein SART3, consequently leading to its nuclear localization and deubiquitinating activity toward the substrate PRP31. Treatment of cells with purvalanol A, a cyclin-dependent kinase inhibitor, results in nuclear translocation of USP15. USP4, another deubiquitinating enzyme with a high sequence homology and domain structure as USP15, also showed purvalanol A-dependent changes in activity and localization. Collectively, our data suggest that modifications of USP15 and USP4 by phosphorylation are important for the regulation of their localization required for cellular function in the spliceosome.
URI
http://pubs.kist.re.kr/handle/201004/70117
ISSN
0022-2836
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KIST Publication > Article
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