7r2g

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USP15 D1D2 in catalytically-competent state bound to mitoxantrone stack (isoform 2)

Structural highlights

7r2g is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.98Å
Ligands:GOL, MIX, ZN
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

UBP15_HUMAN Hydrolase that removes conjugated ubiquitin from target proteins and regulates various pathways such as the TGF-beta receptor signaling and NF-kappa-B pathways. Acts as a key regulator of TGF-beta receptor signaling pathway, but the precise mechanism is still unclear: according to a report, acts by promoting deubiquitination of monoubiquitinated R-SMADs (SMAD1, SMAD2 and/or SMAD3), thereby alleviating inhibition of R-SMADs and promoting activation of TGF-beta target genes (PubMed:21947082). According to another reports, regulates the TGF-beta receptor signaling pathway by mediating deubiquitination and stabilization of TGFBR1, leading to an enhanced TGF-beta signal (PubMed:22344298). Able to mediate deubiquitination of monoubiquitinated substrates as well as 'Lys-48'-linked polyubiquitin chains, protecting them against proteasomal degradation. Acts as an associated component of COP9 signalosome complex (CSN) and regulates different pathways via this association: regulates NF-kappa-B by mediating deubiquitination of NFKBIA and deubiquitinates substrates bound to VCP. Protects APC and human papillomavirus type 16 protein E6 against degradation via the ubiquitin proteasome pathway.[1] [2] [3] [4] [5] [6] [7]

Publication Abstract from PubMed

Ubiquitin specific protease USP15 is a deubiquitinating enzyme reported to regulate several biological and cellular processes, including TGF-beta signaling, regulation of immune response, neuro-inflammation and mRNA splicing. Here we study the USP15 D1D2 catalytic domain and present the crystal structure in its catalytically-competent conformation. We compare this apo-structure to a previous misaligned state in the same crystal lattice. In both structures, mitoxantrone, an FDA approved antineoplastic drug and a weak inhibitor of USP15 is bound, indicating that it is not responsible for inducing a switch in the conformation of active site cysteine in the USP15 D1D2 structure. Instead, mitoxantrone contributes to crystal packing, by forming a stack of 12 mitoxantrone molecules. We believe this reflects how mitoxantrone can be responsible for e.g. nuclear condensate partitioning. We conclude that USP15 can switch between active and inactive states in the absence of ubiquitin, and that this is independent of mitoxantrone binding. These insights can be important for future drug discovery targeting USP15.

Mitoxantrone stacking does not define the active or inactive state of USP15 catalytic domain.,Priyanka A, Tisi D, Sixma TK J Struct Biol. 2022 May 20;214(3):107862. doi: 10.1016/j.jsb.2022.107862. PMID:35605756[8]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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References

  1. ↑ Hetfeld BK, Helfrich A, Kapelari B, Scheel H, Hofmann K, Guterman A, Glickman M, Schade R, Kloetzel PM, Dubiel W. The zinc finger of the CSN-associated deubiquitinating enzyme USP15 is essential to rescue the E3 ligase Rbx1. Curr Biol. 2005 Jul 12;15(13):1217-21. PMID:16005295 doi:10.1016/j.cub.2005.05.059
  2. ↑ Schweitzer K, Bozko PM, Dubiel W, Naumann M. CSN controls NF-kappaB by deubiquitinylation of IkappaBalpha. EMBO J. 2007 Mar 21;26(6):1532-41. Epub 2007 Feb 22. PMID:17318178 doi:10.1038/sj.emboj.7601600
  3. ↑ Cayli S, Klug J, Chapiro J, Frohlich S, Krasteva G, Orel L, Meinhardt A. COP9 signalosome interacts ATP-dependently with p97/valosin-containing protein (VCP) and controls the ubiquitination status of proteins bound to p97/VCP. J Biol Chem. 2009 Dec 11;284(50):34944-53. Epub 2009 Oct 13. PMID:19826004 doi:M109.037952
  4. ↑ Huang X, Langelotz C, Hetfeld-Pechoc BK, Schwenk W, Dubiel W. The COP9 signalosome mediates beta-catenin degradation by deneddylation and blocks adenomatous polyposis coli destruction via USP15. J Mol Biol. 2009 Aug 28;391(4):691-702. Epub 2009 Jul 1. PMID:19576224 doi:S0022-2836(09)00798-0
  5. ↑ Vos RM, Altreuter J, White EA, Howley PM. The ubiquitin-specific peptidase USP15 regulates human papillomavirus type 16 E6 protein stability. J Virol. 2009 Sep;83(17):8885-92. doi: 10.1128/JVI.00605-09. Epub 2009 Jun 24. PMID:19553310 doi:10.1128/JVI.00605-09
  6. ↑ Inui M, Manfrin A, Mamidi A, Martello G, Morsut L, Soligo S, Enzo E, Moro S, Polo S, Dupont S, Cordenonsi M, Piccolo S. USP15 is a deubiquitylating enzyme for receptor-activated SMADs. Nat Cell Biol. 2011 Sep 25;13(11):1368-75. doi: 10.1038/ncb2346. PMID:21947082 doi:10.1038/ncb2346
  7. ↑ Eichhorn PJ, Rodon L, Gonzalez-Junca A, Dirac A, Gili M, Martinez-Saez E, Aura C, Barba I, Peg V, Prat A, Cuartas I, Jimenez J, Garcia-Dorado D, Sahuquillo J, Bernards R, Baselga J, Seoane J. USP15 stabilizes TGF-beta receptor I and promotes oncogenesis through the activation of TGF-beta signaling in glioblastoma. Nat Med. 2012 Feb 19;18(3):429-35. doi: 10.1038/nm.2619. PMID:22344298 doi:10.1038/nm.2619
  8. ↑ Priyanka A, Tisi D, Sixma TK. Mitoxantrone stacking does not define the active or inactive state of USP15 catalytic domain. J Struct Biol. 2022 May 20;214(3):107862. doi: 10.1016/j.jsb.2022.107862. PMID:35605756 doi:http://dx.doi.org/10.1016/j.jsb.2022.107862

Contents


PDB ID 7r2g

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