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  • 1.
    Andréasson, Claes
    et al.
    Stockholm University, Faculty of Science, Department of Molecular Biosciences, The Wenner-Gren Institute.
    Ott, Martin
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Büttner, Sabrina
    Stockholm University, Faculty of Science, Department of Molecular Biosciences, The Wenner-Gren Institute. University of Graz, Austria.
    Mitochondria orchestrate proteostatic and metabolic stress responses2019In: EMBO Reports, ISSN 1469-221X, E-ISSN 1469-3178, Vol. 20, no 10, article id e47865Article in journal (Refereed)
    Abstract [en]

    The eukaryotic cell is morphologically and functionally organized as an interconnected network of organelles that responds to stress and aging. Organelles communicate via dedicated signal transduction pathways and the transfer of information in form of metabolites and energy levels. Recent data suggest that the communication between organellar proteostasis systems is a cornerstone of cellular stress responses in eukaryotic cells. Here, we discuss the integration of proteostasis and energy fluxes in the regulation of cellular stress and aging. We emphasize the molecular architecture of the regulatory transcriptional pathways that both sense and control metabolism and proteostasis. A special focus is placed on mechanistic insights gained from the model organism budding yeast in signaling from mitochondria to the nucleus and how this shapes cellular fitness.

  • 2.
    Masuyer, Geoffrey
    et al.
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Conrad, Julian
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics. Stockholm University, Science for Life Laboratory (SciLifeLab).
    Stenmark, Pål
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    The structure of the tetanus toxin reveals pH-mediated domain dynamics2017In: EMBO Reports, ISSN 1469-221X, E-ISSN 1469-3178, Vol. 18, no 8, p. 1306-1317Article in journal (Refereed)
    Abstract [en]

    The tetanus neurotoxin (TeNT) is a highly potent toxin produced by Clostridium tetani that inhibits neurotransmission of inhibitory interneurons, causing spastic paralysis in the tetanus disease. TeNT differs from the other clostridial neurotoxins by its unique ability to target the central nervous system by retrograde axonal transport. The crystal structure of the tetanus toxin reveals a closed domain arrangement stabilised by two disulphide bridges, and the molecular details of the toxin's interaction with its polysaccharide receptor. An integrative analysis combining X-ray crystallography, solution scattering and single particle electron cryo-microscopy reveals pH-mediated domain rearrangements that may give TeNT the ability to adapt to the multiple environments encountered during intoxication, and facilitate binding to distinct receptors.

  • 3. Ost, Mario
    et al.
    Igual Gil, Carla
    Coleman, Verena
    Keipert, Susanne
    Stockholm University, Faculty of Science, Department of Molecular Biosciences, The Wenner-Gren Institute.
    Efstathiou, Sotirios
    Vidic, Veronika
    Weyers, Miriam
    Klaus, Susanne
    Muscle-derived GDF15 drives diurnal anorexia and systemic metabolic remodeling during mitochondrial stress2020In: EMBO Reports, ISSN 1469-221X, E-ISSN 1469-3178, Vol. 21, no 3, article id e48804Article in journal (Refereed)
    Abstract [en]

    Mitochondrial dysfunction promotes metabolic stress responses in a cell-autonomous as well as organismal manner. The wasting hormone growth differentiation factor 15 (GDF15) is recognized as a biomarker of mitochondrial disorders, but its pathophysiological function remains elusive. To test the hypothesis that GDF15 is fundamental to the metabolic stress response during mitochondrial dysfunction, we investigated transgenic mice (Ucp1-TG) with compromised muscle-specific mitochondrial OXPHOS capacity via respiratory uncoupling. Ucp1-TG mice show a skeletal muscle-specific induction and diurnal variation of GDF15 as a myokine. Remarkably, genetic loss of GDF15 in Ucp1-TG mice does not affect muscle wasting or transcriptional cell-autonomous stress response but promotes a progressive increase in body fat mass. Furthermore, muscle mitochondrial stress-induced systemic metabolic flexibility, insulin sensitivity, and white adipose tissue browning are fully abolished in the absence of GDF15. Mechanistically, we uncovered a GDF15-dependent daytime-restricted anorexia, whereas GDF15 is unable to suppress food intake at night. Altogether, our evidence suggests a novel diurnal action and key pathophysiological role of mitochondrial stress-induced GDF15 in the regulation of systemic energy metabolism.

  • 4. Segal-Raz, Hava
    et al.
    Mass, Gilad
    Baranes-Bachar, Keren
    Lerenthal, Yaniv
    Wang, Shih-Ya
    Chung, Young Min
    Ziv-Lehrman, Shelly
    Ström, Cecilia E.
    Stockholm University, Faculty of Science, Department of Genetics, Microbiology and Toxicology.
    Helleday, Thomas
    Stockholm University, Faculty of Science, Department of Genetics, Microbiology and Toxicology.
    Hu, Mickey C. -T.
    Chen, David J.
    Shiloh, Yosef
    ATM-mediated phosphorylation of polynucleotide kinase/phosphatase is required for effective DNA double-strand break repair2011In: EMBO Reports, ISSN 1469-221X, E-ISSN 1469-3178, Vol. 12, no 7, p. 713-719Article in journal (Refereed)
    Abstract [en]

    The cellular response to double-strand breaks (DSBs) in DNA is a complex signalling network, mobilized by the nuclear protein kinase ataxia-telangiectasia mutated (ATM), which phosphorylates many factors in the various branches of this network. A main question is how ATM regulates DSB repair. Here, we identify the DNA repair enzyme polynucleotide kinase/phosphatase (PNKP) as an ATM target. PNKP phosphorylates 5'-OH and dephosphorylates 3'-phosphate DNA ends that are formed at DSB termini caused by DNA-damaging agents, thereby regenerating legitimate ends for further processing. We establish that the ATM phosphorylation targets on human PNKP-Ser 114 and Ser 126-are crucial for cellular survival following DSB induction and for effective DSB repair, being essential for damage-induced enhancement of the activity of PNKP and its proper accumulation at the sites of DNA damage. These findings show a direct functional link between ATM and the DSB-repair machinery.

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