Subcellular Localization and Mitotic Interactome Analyses Identify SIRT4 as a Centrosomally Localized and Microtubule Associated Protein
Abstract
:1. Introduction
2. Materials and Methods
2.1. Cell Culture
2.2. Generation of SIRT4 Expressing Cell Lines
2.3. Cell Proliferation Kinetics
2.4. Live Cell Imaging
2.5. Preparation of Total Cell Lysates for Immunoblot Analysis
2.6. Immunoprecipitation of GFP Fusion Proteins Using the Anti-GFP Nanobody or Standard Immunoprecipitation Protocols
2.7. Subcellular Fractionation Analysis
2.8. Microtubule Pulldown Experiments
2.9. Ro3306 Mediated G2 Cell Cycle Arrest
2.10. Mass Spectrometric Analysis of the Mitotic SIRT4 Interactome
2.11. Confocal Laser Scanning Microscopy and Signal Quantification Using ImageJ Software
2.12. Statistical Analysis
3. Results
3.1. Endogenous SIRT4 and Ectopically Expressed SIRT4-eGFP Localize at Interphase and Mitotic Centrosomes
3.2. Centrosomal Localization Kinetics of SIRT4 during Cell Cycle Progression
3.3. Subcellular Fractionation Reveals a Cytosolic, Extra-Mitochondrial Pool of SIRT4, But Not SIRT3
3.4. Ectopic Overexpression of SIRT4 or the Extra-Mitochondrial Localized Deletion Mutant SIRT4(ΔN28) Inhibits Mitotic Progression and Cell Proliferation
3.5. The Mitotic SIRT4 Interactome Comprises Microtubule-Associated Structural and Regulatory Proteins
3.6. SIRT4 Interacts with Microtubules and Negatively Regulates Acetyl-α-Tubulin (K40) Levels
4. Discussion
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Bergmann, L.; Lang, A.; Bross, C.; Altinoluk-Hambüchen, S.; Fey, I.; Overbeck, N.; Stefanski, A.; Wiek, C.; Kefalas, A.; Verhülsdonk, P.; et al. Subcellular Localization and Mitotic Interactome Analyses Identify SIRT4 as a Centrosomally Localized and Microtubule Associated Protein. Cells 2020, 9, 1950. https://0-doi-org.brum.beds.ac.uk/10.3390/cells9091950
Bergmann L, Lang A, Bross C, Altinoluk-Hambüchen S, Fey I, Overbeck N, Stefanski A, Wiek C, Kefalas A, Verhülsdonk P, et al. Subcellular Localization and Mitotic Interactome Analyses Identify SIRT4 as a Centrosomally Localized and Microtubule Associated Protein. Cells. 2020; 9(9):1950. https://0-doi-org.brum.beds.ac.uk/10.3390/cells9091950
Chicago/Turabian StyleBergmann, Laura, Alexander Lang, Christoph Bross, Simone Altinoluk-Hambüchen, Iris Fey, Nina Overbeck, Anja Stefanski, Constanze Wiek, Andreas Kefalas, Patrick Verhülsdonk, and et al. 2020. "Subcellular Localization and Mitotic Interactome Analyses Identify SIRT4 as a Centrosomally Localized and Microtubule Associated Protein" Cells 9, no. 9: 1950. https://0-doi-org.brum.beds.ac.uk/10.3390/cells9091950