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Hampel N, Georgy J, Mehrabipour M, Lang A, Lehmkuhl I, Scheller J, Ahmadian MR, Floss DM, Piekorz RP. CoCl 2 -triggered pseudohypoxic stress induces proteasomal degradation of SIRT4 via polyubiquitination of lysines K78 and K299. FEBS Open Bio 2023; 13:2187-2199. [PMID: 37803520 PMCID: PMC10699113 DOI: 10.1002/2211-5463.13715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 08/24/2023] [Accepted: 10/04/2023] [Indexed: 10/08/2023] Open
Abstract
SIRT4, together with SIRT3 and SIRT5, comprises the mitochondrially localized subgroup of sirtuins. SIRT4 regulates mitochondrial bioenergetics, dynamics (mitochondrial fusion), and quality control (mitophagy) via its NAD+ -dependent enzymatic activities. Here, we address the regulation of SIRT4 itself by characterizing its protein stability and degradation upon CoCl2 -induced pseudohypoxic stress that typically triggers mitophagy. Interestingly, we observed that of the mitochondrial sirtuins, only the protein levels of SIRT4 or ectopically expressed SIRT4-eGFP decrease upon CoCl2 treatment of HEK293 cells. Co-treatment with BafA1, an inhibitor of autophagosome-lysosome fusion required for autophagy/mitophagy, or the use of the proteasome inhibitor MG132, prevented CoCl2 -induced SIRT4 downregulation. Consistent with the proteasomal degradation of SIRT4, the lysine mutants SIRT4(K78R) and SIRT4(K299R) showed significantly reduced polyubiquitination upon CoCl2 treatment and were more resistant to pseudohypoxia-induced degradation as compared to SIRT4. Moreover, SIRT4(K78R) and SIRT4(K299R) displayed increased basal protein stability as compared to wild-type SIRT4 when subjected to MG132 treatment or cycloheximide (CHX) chase assays. Thus, our data indicate that stress-induced protein degradation of SIRT4 occurs through two mechanisms: (a) via mitochondrial autophagy/mitophagy, and (b) as a separate process via proteasomal degradation within the cytoplasm.
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Affiliation(s)
- Nils Hampel
- Institute of Biochemistry and Molecular Biology II, Medical FacultyHeinrich Heine University DüsseldorfUniversitätsstrasse 1Düsseldorf40225Germany
| | - Jacqueline Georgy
- Institute of Biochemistry and Molecular Biology II, Medical FacultyHeinrich Heine University DüsseldorfUniversitätsstrasse 1Düsseldorf40225Germany
| | - Mehrnaz Mehrabipour
- Institute of Biochemistry and Molecular Biology II, Medical FacultyHeinrich Heine University DüsseldorfUniversitätsstrasse 1Düsseldorf40225Germany
| | - Alexander Lang
- Institute of Biochemistry and Molecular Biology II, Medical FacultyHeinrich Heine University DüsseldorfUniversitätsstrasse 1Düsseldorf40225Germany
- Present address:
Department of Cardiology, Pulmonology, and Vascular Medicine, Medical FacultyHeinrich Heine University DüsseldorfGermany
| | - Isabell Lehmkuhl
- Institute of Biochemistry and Molecular Biology II, Medical FacultyHeinrich Heine University DüsseldorfUniversitätsstrasse 1Düsseldorf40225Germany
| | - Jürgen Scheller
- Institute of Biochemistry and Molecular Biology II, Medical FacultyHeinrich Heine University DüsseldorfUniversitätsstrasse 1Düsseldorf40225Germany
| | - Mohammad R. Ahmadian
- Institute of Biochemistry and Molecular Biology II, Medical FacultyHeinrich Heine University DüsseldorfUniversitätsstrasse 1Düsseldorf40225Germany
| | - Doreen M. Floss
- Institute of Biochemistry and Molecular Biology II, Medical FacultyHeinrich Heine University DüsseldorfUniversitätsstrasse 1Düsseldorf40225Germany
| | - Roland P. Piekorz
- Institute of Biochemistry and Molecular Biology II, Medical FacultyHeinrich Heine University DüsseldorfUniversitätsstrasse 1Düsseldorf40225Germany
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Georgy J, Arlt Y, Moll JM, Ouzin M, Weitz HT, Gremer L, Willbold D, Grötzinger J, Thives-Kurenbach F, Scheller J, Floss DM. Tryptophan (W) at position 37 of murine IL-12/IL-23 p40 is mandatory for binding to IL-12Rβ1 and subsequent signal transduction. J Biol Chem 2021; 297:101295. [PMID: 34637790 PMCID: PMC8571081 DOI: 10.1016/j.jbc.2021.101295] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 10/04/2021] [Accepted: 10/07/2021] [Indexed: 11/17/2022] Open
Abstract
Interleukin (IL)-12 and IL-23 are composite cytokines consisting of p35/p40 and p19/p40, respectively, which signal via the common IL-12 receptor β1 (IL-12Rβ1) and the cytokine-specific receptors IL-12Rβ2 and IL-23R. Previous data showed that the p40 component interacts with IL-12Rβ1, whereas p19 and p35 subunits solely bind to IL-23R and IL-12Rβ2, resulting in tetrameric signaling complexes. In the absence of p19 and p35, p40 forms homodimers and may induce signaling via IL-12Rβ1 homodimers. The critical amino acids of p19 and p35 required for binding to IL-23R and IL-12Rβ2 are known, and two regions of p40 critical for binding to IL-12Rβ1 have recently been identified. In order to characterize the involvement of the N-terminal region of p40 in binding to IL-12Rβ1, we generated deletion variants of the p40-p19 fusion cytokine. We found that an N-terminal deletion variant missing amino acids M23 to P39 failed to induce IL-23-dependent signaling and did not bind to IL-12Rβ1, whereas binding to IL-23R was maintained. Amino acid replacements showed that p40W37K largely abolished IL-23-induced signal transduction and binding to IL-12Rβ1, but not binding to IL-23R. Combining p40W37K with D36K and T38K mutations eliminated the biological activity of IL-23. Finally, homodimeric p40D36K/W37K/T38K did not interact with IL-12Rβ1, indicating binding of homodimeric p40 to IL-12Rβ1 is comparable to the interaction of IL-23/IL-12 and IL-12Rβ1. In summary, we have defined D36, W37, and T38 as hotspot amino acids for the interaction of IL-12/IL-23 p40 with IL-12Rβ1. Structural insights into cytokine–cytokine receptor binding are important to develop novel therapeutic strategies.
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Affiliation(s)
- Jacqueline Georgy
- Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Yvonne Arlt
- Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Jens M Moll
- Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Meryem Ouzin
- Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Hendrik T Weitz
- Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Lothar Gremer
- Institute of Biological Information Processing (IBI-7: Structural Biochemistry) and JuStruct: Jülich Center for Structural Biology, Forschungszentrum Jülich, Jülich, Germany; Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Dieter Willbold
- Institute of Biological Information Processing (IBI-7: Structural Biochemistry) and JuStruct: Jülich Center for Structural Biology, Forschungszentrum Jülich, Jülich, Germany; Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Joachim Grötzinger
- Institute of Biochemistry, Medical Faculty, Christian-Albrechts-University Kiel, Kiel, Germany
| | - Felix Thives-Kurenbach
- Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Jürgen Scheller
- Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Doreen M Floss
- Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany.
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Georgy J, Singh A, Joel A, Chacko R, John A, Ninan F, Paul A, John G. A high rate of pathological complete response is possible by incorporating cisplatin in neoadjuvant therapy of locally advanced triple-negative breast cancer: A single-institution experience. Eur J Cancer 2020. [DOI: 10.1016/s0959-8049(20)30687-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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John A, Joel A, Georgy J, Singh A, Jesudasan M, Mittal R, Ram T, Reddy J, Chandramohan A, Ninan R, Masih D, Yadav B. P-193 Safety, tolerability, and efficacy of total neoadjuvant therapy for adult patients with locally advanced high-risk rectal adenocarcinoma: Retrospective real-world data from South India. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.04.275] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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