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Borgert L, Becker T, den Brave F. Conserved quality control mechanisms of mitochondrial protein import. J Inherit Metab Dis 2024. [PMID: 38790152 DOI: 10.1002/jimd.12756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 04/15/2024] [Accepted: 05/08/2024] [Indexed: 05/26/2024]
Abstract
Mitochondria carry out essential functions for the cell, including energy production, various biosynthesis pathways, formation of co-factors and cellular signalling in apoptosis and inflammation. The functionality of mitochondria requires the import of about 900-1300 proteins from the cytosol in baker's yeast Saccharomyces cerevisiae and human cells, respectively. The vast majority of these proteins pass the outer membrane in a largely unfolded state through the translocase of the outer mitochondrial membrane (TOM) complex. Subsequently, specific protein translocases sort the precursor proteins into the outer and inner membranes, the intermembrane space and matrix. Premature folding of mitochondrial precursor proteins, defects in the mitochondrial protein translocases or a reduction of the membrane potential across the inner mitochondrial membrane can cause stalling of precursors at the protein import apparatus. Consequently, the translocon is clogged and non-imported precursor proteins accumulate in the cell, which in turn leads to proteotoxic stress and eventually cell death. To prevent such stress situations, quality control mechanisms remove non-imported precursor proteins from the TOM channel. The highly conserved ubiquitin-proteasome system of the cytosol plays a critical role in this process. Thus, the surveillance of protein import via the TOM complex involves the coordinated activity of mitochondria-localized and cytosolic proteins to prevent proteotoxic stress in the cell.
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Affiliation(s)
- Lion Borgert
- Faculty of Medicine, Institute of Biochemistry and Molecular Biology, University of Bonn, Bonn, Germany
| | - Thomas Becker
- Faculty of Medicine, Institute of Biochemistry and Molecular Biology, University of Bonn, Bonn, Germany
| | - Fabian den Brave
- Faculty of Medicine, Institute of Biochemistry and Molecular Biology, University of Bonn, Bonn, Germany
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Needs HI, Glover E, Pereira GC, Witt A, Hübner W, Dodding MP, Henley JM, Collinson I. Rescue of mitochondrial import failure by intercellular organellar transfer. Nat Commun 2024; 15:988. [PMID: 38307874 PMCID: PMC10837123 DOI: 10.1038/s41467-024-45283-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 01/19/2024] [Indexed: 02/04/2024] Open
Abstract
Mitochondria are the powerhouses of eukaryotic cells, composed mostly of nuclear-encoded proteins imported from the cytosol. Thus, problems with the import machinery will disrupt their regenerative capacity and the cell's energy supplies - particularly troublesome for energy-demanding cells of nervous tissue and muscle. Unsurprisingly then, import breakdown is implicated in disease. Here, we explore the consequences of import failure in mammalian cells; wherein, blocking the import machinery impacts mitochondrial ultra-structure and dynamics, but, surprisingly, does not affect import. Our data are consistent with a response involving intercellular mitochondrial transport via tunnelling nanotubes to import healthy mitochondria and jettison those with blocked import sites. These observations support the existence of a widespread mechanism for the rescue of mitochondrial dysfunction.
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Affiliation(s)
- Hope I Needs
- School of Biochemistry, University of Bristol, Bristol, BS8 1TD, UK
| | - Emily Glover
- School of Biochemistry, University of Bristol, Bristol, BS8 1TD, UK
| | - Gonçalo C Pereira
- School of Biochemistry, University of Bristol, Bristol, BS8 1TD, UK
- Nanna Therapeutics, Merrifield Centre, Rosemary Lane, Cambridge, CB1 3LQ, UK
| | - Alina Witt
- Fakultät für Physik, Universität Bielefeld, Bielefeld, Postfach 100131 D-33501, Germany
| | - Wolfgang Hübner
- Fakultät für Physik, Universität Bielefeld, Bielefeld, Postfach 100131 D-33501, Germany
| | - Mark P Dodding
- School of Biochemistry, University of Bristol, Bristol, BS8 1TD, UK
| | - Jeremy M Henley
- School of Biochemistry, University of Bristol, Bristol, BS8 1TD, UK.
| | - Ian Collinson
- School of Biochemistry, University of Bristol, Bristol, BS8 1TD, UK.
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Hedna R, DiMaio A, Robin M, Allegro D, Tatoni M, Peyrot V, Barbier P, Kovacic H, Breuzard G. 2-Aminothiazole-Flavonoid Hybrid Derivatives Binding to Tau Protein and Responsible for Antitumor Activity in Glioblastoma. Int J Mol Sci 2023; 24:15050. [PMID: 37894731 PMCID: PMC10606064 DOI: 10.3390/ijms242015050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/04/2023] [Accepted: 10/05/2023] [Indexed: 10/29/2023] Open
Abstract
Tau protein has been described for several decades as a promoter of tubulin assembly into microtubules. Dysregulation or alterations in Tau expression have been related to various brain cancers, including the highly aggressive and lethal brain tumor glioblastoma multiform (GBM). In this respect, Tau holds significant promise as a target for the development of novel therapies. Here, we examined the structure-activity relationship of a new series of seventeen 2-aminothiazole-fused to flavonoid hybrid compounds (TZF) on Tau binding, Tau fibrillation, and cellular effects on Tau-expressing cancer cells. By spectrofluorometric approach, we found that two compounds, 2 and 9, demonstrated high affinity for Tau and exhibited a strong propensity to inhibit Tau fibrillation. Then, the biological activity of these compounds was evaluated on several Tau-expressing cells derived from glioblastoma. The two lead compounds displayed a high anti-metabolic activity on cells related to an increased fission of the mitochondria network. Moreover, we showed that both compounds induced microtubule bundling within newly formed neurite-like protrusions, as well as with defection of cell migration. Taken together, our results provide a strong experimental basis to develop new potent molecules targeting Tau-expressing cancer cells, such as GBM.
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Affiliation(s)
- Rayane Hedna
- Faculté des Sciences Médicales et Paramédicales, Institut de Neurophysiopathologie (INP), UMR 7051, CNRS, Aix Marseille Université, 13005 Marseille, France; (R.H.); (D.A.); (M.T.); (V.P.); (P.B.); (H.K.)
| | - Attilio DiMaio
- Faculté de Pharmacie, Institut Méditerranéen de Biodiversité et Ecologie Marine et Continentale (IMBE), UMR 7263, CNRS, IRD 237, Aix-Marseille Université, 13005 Marseille, France; (A.D.); (M.R.)
| | - Maxime Robin
- Faculté de Pharmacie, Institut Méditerranéen de Biodiversité et Ecologie Marine et Continentale (IMBE), UMR 7263, CNRS, IRD 237, Aix-Marseille Université, 13005 Marseille, France; (A.D.); (M.R.)
| | - Diane Allegro
- Faculté des Sciences Médicales et Paramédicales, Institut de Neurophysiopathologie (INP), UMR 7051, CNRS, Aix Marseille Université, 13005 Marseille, France; (R.H.); (D.A.); (M.T.); (V.P.); (P.B.); (H.K.)
| | - Mario Tatoni
- Faculté des Sciences Médicales et Paramédicales, Institut de Neurophysiopathologie (INP), UMR 7051, CNRS, Aix Marseille Université, 13005 Marseille, France; (R.H.); (D.A.); (M.T.); (V.P.); (P.B.); (H.K.)
| | - Vincent Peyrot
- Faculté des Sciences Médicales et Paramédicales, Institut de Neurophysiopathologie (INP), UMR 7051, CNRS, Aix Marseille Université, 13005 Marseille, France; (R.H.); (D.A.); (M.T.); (V.P.); (P.B.); (H.K.)
| | - Pascale Barbier
- Faculté des Sciences Médicales et Paramédicales, Institut de Neurophysiopathologie (INP), UMR 7051, CNRS, Aix Marseille Université, 13005 Marseille, France; (R.H.); (D.A.); (M.T.); (V.P.); (P.B.); (H.K.)
| | - Hervé Kovacic
- Faculté des Sciences Médicales et Paramédicales, Institut de Neurophysiopathologie (INP), UMR 7051, CNRS, Aix Marseille Université, 13005 Marseille, France; (R.H.); (D.A.); (M.T.); (V.P.); (P.B.); (H.K.)
| | - Gilles Breuzard
- Faculté des Sciences Médicales et Paramédicales, Institut de Neurophysiopathologie (INP), UMR 7051, CNRS, Aix Marseille Université, 13005 Marseille, France; (R.H.); (D.A.); (M.T.); (V.P.); (P.B.); (H.K.)
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