Structure of the USP15 N-Terminal Domains: A β-Hairpin Mediates Close Association between the DUSP and UBL Domains

Ubiquitin specific protease 15 (USP15) functions in COP9 signalosome mediated regulation of protein degradation and cellular signaling through catalyzing the ubiquitin deconjugation reaction of a discrete number of substrates. It influences the stability of adenomatous polyposis coli, IκBα, caspase-...

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Bibliographic Details
Published in:Biochemistry (Easton) 2011-09, Vol.50 (37), p.7995-8004
Main Authors: Harper, Stephen, Besong, Tabot M. D, Emsley, Jonas, Scott, David J, Dreveny, Ingrid
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Animals
Crystallization - methods
Crystallography, X-Ray - methods
Endopeptidases - chemistry
Endopeptidases - genetics
Endopeptidases - metabolism
Humans
Mice
Molecular Sequence Data
Protein Structure, Secondary
Protein Structure, Tertiary - physiology
Ubiquitin-Specific Proteases
Ubiquitins - chemistry
Ubiquitins - genetics
Ubiquitins - metabolism
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Summary:Ubiquitin specific protease 15 (USP15) functions in COP9 signalosome mediated regulation of protein degradation and cellular signaling through catalyzing the ubiquitin deconjugation reaction of a discrete number of substrates. It influences the stability of adenomatous polyposis coli, IκBα, caspase-3, and the human papillomavirus type 16 E6. USP15 forms a subfamily with USP4 and USP11 related through a shared presence of N-terminal “domain present in ubiquitin specific proteases” (DUSP) and “ubiquitin-like” (UBL) domains (DU subfamily). Here we report the 1.5 Å resolution crystal structure of the human USP15 N-terminal domains revealing a 80 Å elongated arrangement with the DU domains aligned in tandem. This architecture is generated through formation of a defined interface that is dominated by an intervening β-hairpin structure (DU finger) that engages in an intricate hydrogen-bonding network between the domains. The UBL domain is closely related to ubiquitin among β-grasp folds but is characterized by the presence of longer loop regions and different surface characteristics, indicating that this domain is unlikely to act as ubiquitin mimic. Comparison with the related murine USP4 DUSP-UBL crystal structure reveals that the main DU interdomain contacts are conserved. Analytical ultracentrifugation, small-angle X-ray scattering, and gel filtration experiments revealed that USP15 DU is monomeric in solution. Our data provide a framework to advance study of the structure and function of the DU subfamily.
ISSN:0006-2960
1520-4995
DOI:10.1021/bi200726e