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Arar W, Ali RB, El May MV, Khatyr A, Jourdain I, Knorr M, Brieger L, Scheel R, Strohmann C, Chaker A, Akacha AB. Synthesis, crystal structures and biological activities of halogeno-(O-alkylphenylcarbamothioate)bis(triarylphosphine)copper(I) complexes. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2023.135370] [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: 03/29/2023]
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2
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Gaudillat Q, Krupp A, Zwingelstein T, Humblot V, Strohmann C, Jourdain I, Knorr M, Viau L. Silver-based coordination polymers assembled by dithioether ligands: potential antibacterial materials despite received ideas. Dalton Trans 2023; 52:5859-5864. [PMID: 37102620 DOI: 10.1039/d3dt00683b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
We report on the first examples on the antibacterial activity towards Gram-negative and Gram-positive bacteria of 2D silver-based coordination polymers obtained by self-assembly with acetylenic dithioether ligands. Their structure imparts a good stability that allows a sustainable release of Ag+ in the media.
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Affiliation(s)
- Quentin Gaudillat
- Institut UTINAM, UMR CNRS 6213, Université de Franche-Comté, 16 route de Gray, 25030 Besançon Cedex, France.
| | - Anna Krupp
- Anorganische Chemie Technische Universität Dortmund, Otto-Hahn Straße 6, 44227 Dortmund, Germany
| | - Thibaut Zwingelstein
- Université Franche-Comté, UMR CNRS 6174, Institut FEMTO-ST, 15B avenue des Montboucons, 25030 Besançon, France
| | - Vincent Humblot
- Université Franche-Comté, UMR CNRS 6174, Institut FEMTO-ST, 15B avenue des Montboucons, 25030 Besançon, France
| | - Carsten Strohmann
- Anorganische Chemie Technische Universität Dortmund, Otto-Hahn Straße 6, 44227 Dortmund, Germany
| | - Isabelle Jourdain
- Institut UTINAM, UMR CNRS 6213, Université de Franche-Comté, 16 route de Gray, 25030 Besançon Cedex, France.
| | - Michael Knorr
- Institut UTINAM, UMR CNRS 6213, Université de Franche-Comté, 16 route de Gray, 25030 Besançon Cedex, France.
| | - Lydie Viau
- Institut UTINAM, UMR CNRS 6213, Université de Franche-Comté, 16 route de Gray, 25030 Besançon Cedex, France.
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Schmidt A, Jourdain I, Knorr M, Strohmann C. Crystal structure and Hirshfeld analysis of trans-di-iodido-bis-[(methyl-sulfan-yl)benzene-κ S]platinum(II). Acta Crystallogr E Crystallogr Commun 2023; 79:516-520. [PMID: 37151826 PMCID: PMC10162077 DOI: 10.1107/s2056989023003717] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Accepted: 04/24/2023] [Indexed: 05/09/2023]
Abstract
The title complex, [PtI2(C7H8I2)2], represents a further example of a square-planar PtII-di-thio-ether complex. It crystallizes in the monoclinic space group P21/c. Additional Hirshfeld analyses indicate a C-H⋯π inter-action along the [010] axis to be the most important packing factor.
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Affiliation(s)
- Annika Schmidt
- TU Dortmund University, Institute for Inorganic Chemistry, Otto-Hahn-Strasse 6, 44227 Dortmund, Germany
| | - Isabelle Jourdain
- Institut UTINAM CNRS UMR 6213, Equipe "Matériaux et Surfaces Fonctionnels", Université de Franche-Comté, Faculté des Sciences et des Techniques La Bouloie - 16 Route de Gray, 25030 BESANÇON CEDEX, France
| | - Michael Knorr
- Institut UTINAM CNRS UMR 6213, Equipe "Matériaux et Surfaces Fonctionnels", Université de Franche-Comté, Faculté des Sciences et des Techniques La Bouloie - 16 Route de Gray, 25030 BESANÇON CEDEX, France
| | - Carsten Strohmann
- TU Dortmund University, Institute for Inorganic Chemistry, Otto-Hahn-Strasse 6, 44227 Dortmund, Germany
- Correspondence e-mail:
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Mohamed AS, Jourdain I, Knorr M, Brieger L, Strohmann C. Crystal structure of {μ 2-1,2-bis-[(4-methyl-phenyl-sulfan-yl]-3-oxoprop-1-ene-1,3-di-yl-1:2κ 2 C 3: C 1}dicarbon-yl-1κ 2 C-[μ 2-methyl-enebis(di-phenyl-phos-phane)-1:2κ 2 P: P'](tri-phenyl-phosphane-2κ P)iron-platinum( Fe- Pt), [(OC) 2Fe(μ-dppm){μ-C(=O)C(4-MeC 6H 4SCH 2)=CCH 2SC 6H 4Me-4}Pt(PPh 3)]. Acta Crystallogr E Crystallogr Commun 2020; 76:1087-1091. [PMID: 32695457 PMCID: PMC7336804 DOI: 10.1107/s2056989020007859] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 05/15/2020] [Accepted: 06/10/2020] [Indexed: 03/30/2024]
Abstract
The title compound, [FePt(C19H18OS2)(C18H15P)(C25H22P2)(CO)2], 1, [(OC)2Fe(μ-dppm)(μ-C(=O)C(CH2SC6H4Me-4)=CCH2SC6H4Me-4)Pt(PPh3)], represents the first example of a diphosphane-bridged heterobimetallic Fe-Pt dimetalla-cyclo-pentenone complex resulting from a bimetallic activation of metal-coordinated carbonyl ligand with an inter-nal alkyne, namely 1,4-bis-(p-tolyl-thio)-but-2-yne. The bridging μ2-C(=O)C(CH2SC6H4Me-4)=CCH2SC6H4Me-4 unit (stemming from a carbon-carbon coupling reaction between CO and the triple bond of the alkyne di-thio-ether) forms a five-membered dimetalla-cyclo-pentenone ring, in which the C=C bond is π-coordinated to the Fe center. The latter is connected to the Pt center through a short metal-metal bond of 2.5697 (6) Å.
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Affiliation(s)
- Ahmed Said Mohamed
- Centre D’Etude et de Recherche de Djibouti, Djibouti
- Institut UTINAM UMR 6213 CNRS, Université Bourgogne Franche-Comté, 16 Route de Gray, 25030 Besançon, France
| | - Isabelle Jourdain
- Institut UTINAM UMR 6213 CNRS, Université Bourgogne Franche-Comté, 16 Route de Gray, 25030 Besançon, France
| | - Michael Knorr
- Institut UTINAM UMR 6213 CNRS, Université Bourgogne Franche-Comté, 16 Route de Gray, 25030 Besançon, France
| | - Lukas Brieger
- Institute for Inorganic Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn Str. 6, 44227 Dortmund, Germany
| | - Carsten Strohmann
- Institute for Inorganic Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn Str. 6, 44227 Dortmund, Germany
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Kampmeyer C, Johansen JV, Holmberg C, Karlson M, Gersing SK, Bordallo HN, Kragelund BB, Lerche MH, Jourdain I, Winther JR, Hartmann-Petersen R. Mutations in a Single Signaling Pathway Allow Cell Growth in Heavy Water. ACS Synth Biol 2020; 9:733-748. [PMID: 32142608 DOI: 10.1021/acssynbio.9b00376] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Life is completely dependent on water. To analyze the role of water as a solvent in biology, we replaced water with heavy water (D2O) and investigated the biological effects by a wide range of techniques, using Schizosaccharomyces pombe as model organism. We show that high concentrations of D2O lead to altered glucose metabolism and growth retardation. After prolonged incubation in D2O, cells displayed gross morphological changes, thickened cell walls, and aberrant cytoskeletal organization. By transcriptomics and genetic screens, we show that the solvent replacement activates two signaling pathways: (1) the heat-shock response pathway and (2) the cell integrity pathway. Although the heat-shock response system upregulates various chaperones and other stress-relieving enzymes, we find that the activation of this pathway does not offer any fitness advantage to the cells under the solvent-replaced conditions. However, limiting the D2O-triggered activation of the cell integrity pathway allows cell growth when H2O is completely replaced with D2O. The isolated D2O-tolerant strains may aid biological production of deuterated biomolecules.
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Affiliation(s)
- Caroline Kampmeyer
- The Linderstrøm-Lang Center, Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, DK-2200 Copenhagen, Denmark
| | - Jens V. Johansen
- Biotech Research and Innovation Centre, University of Copenhagen, Ole Maaløes Vej 5, DK-2200 Copenhagen, Denmark
| | - Christian Holmberg
- The Linderstrøm-Lang Center, Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, DK-2200 Copenhagen, Denmark
| | - Magnus Karlson
- Technical University of Denmark, Department of Electrical Engineering, Ørsted Plads, Building 349, DK-2800 Kongens Lyngby, Denmark
| | - Sarah K. Gersing
- The Linderstrøm-Lang Center, Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, DK-2200 Copenhagen, Denmark
| | - Heloisa N. Bordallo
- Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Birthe B. Kragelund
- The Linderstrøm-Lang Center, Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, DK-2200 Copenhagen, Denmark
- The REPIN Center, Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, DK-2200 Copenhagen, Denmark
| | - Mathilde H. Lerche
- Technical University of Denmark, Department of Electrical Engineering, Ørsted Plads, Building 349, DK-2800 Kongens Lyngby, Denmark
| | - Isabelle Jourdain
- College of Life and Environmental Sciences, University of Exeter, Geoffrey Pope Building, Stocker Road, Exeter EX4 4QD, United Kingdom
| | - Jakob R. Winther
- The Linderstrøm-Lang Center, Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, DK-2200 Copenhagen, Denmark
| | - Rasmus Hartmann-Petersen
- The Linderstrøm-Lang Center, Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, DK-2200 Copenhagen, Denmark
- The REPIN Center, Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, DK-2200 Copenhagen, Denmark
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Brieger L, Jourdain I, Knorr M, Strohmann C. Crystal structure of dicarbon-yl[μ 2-methyl-enebis(di-phenyl-phosphane)-κ 2 P: P'][μ 2-2-(2,4,5-tri-methyl-phen-yl)-3-oxoprop-1-ene-1,3-di-yl](tri-phenyl-phosphane-κ P)ironplatinum( Fe- Pt)-di-chloro-methane-toluene (1/1/2), [(OC) 2Fe(μ-dppm)(μ-C(=O)C(2,4,5-C 6H 2Me 3)=CH)Pt(PPh 3)]. Acta Crystallogr E Crystallogr Commun 2019; 75:1902-1906. [PMID: 31871755 PMCID: PMC6895934 DOI: 10.1107/s2056989019015573] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 11/18/2019] [Indexed: 05/30/2023]
Abstract
The title compound, [(OC)2Fe(μ-dppm)(μ-C(=O)C(2,4,5-C6H2Me3)= CH)Pt(PPh3)], represents an example of a diphosphane-bridged heterobimetallic dimetallacyclopentenone complex resulting from a bimetallic activation of 1-ethynyl-2,4,5-trimethylbenzene and a metal-coordinated carbonyl ligand. The title compound, [FePt(C12H12O)(C18H15P)(C25H22P2)(CO)2]·2C7H8·CH2Cl2 or [(OC)2Fe(μ-dppm)(μ-C(=O)C(2,4,5-C6H2Me3)=CH)Pt(PPh3)], represents an example of a diphosphane-bridged heterobimetallic dimetallacyclopentenone complex resulting from a bimetallic activation of 1-ethynyl-2,4,5-trimethylbenzene and a metal-coordinated carbonyl ligand. The bridging μ2-C(=O)C(2,4,5-C6H2Me3)=CH unit (stemming from a carbon–carbon coupling reaction between CO and the terminal alkyne) forms a five-membered dimetallacyclopentenone ring, in which the C=C bond is π-coordinated to the Fe centre. The latter is connected to the Pt centre through a short metal–metal bond of 2.5770 (5) Å. In the crystal, the complex is solvated by one dichloromethane and two toluene molecules.
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Affiliation(s)
- Lukas Brieger
- Technical University Dortmund, Chemistry and Chemical Biology, Inorganic Chemistry, Otto-Hahn Str. 6, 44227 Dortmund, Germany
| | - Isabelle Jourdain
- Institut UTINAM UMR 6213 CNRS, Université Bourgogne Franche-Comté, 16, Route de Gray, 25030 Besançon Cedex, France
| | - Michael Knorr
- Institut UTINAM UMR 6213 CNRS, Université Bourgogne Franche-Comté, 16, Route de Gray, 25030 Besançon Cedex, France
| | - Carsten Strohmann
- Technical University Dortmund, Chemistry and Chemical Biology, Inorganic Chemistry, Otto-Hahn Str. 6, 44227 Dortmund, Germany
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Tang NH, Fong CS, Masuda H, Jourdain I, Yukawa M, Toda T. Generation of temperature sensitive mutations with error-prone PCR in a gene encoding a component of the spindle pole body in fission yeast. Biosci Biotechnol Biochem 2019; 83:1717-1720. [DOI: 10.1080/09168451.2019.1611414] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
ABSTRACT
Temperature-sensitive (ts) mutants provide powerful tools for investigation of cellular functions of essential genes. We report here asimple procedure to generate ts mutations using error-prone PCR within pcp1 that encodes aspindle pole body (SPB) component in Schizosaccharomyces pombe. This manipulation is not restricted to pcp1, and can be suited to any essential genes involved in other processes.
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Affiliation(s)
- Ngang Heok Tang
- Section of Neurobiology, Division of Biological Sciences, University of California, San Diego, CA, USA
| | - Chii Shyang Fong
- Cell Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Hirohisa Masuda
- Telomere Biology Section, Laboratory of Biochemistry and Molecular Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Isabelle Jourdain
- Biosciences, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Masashi Yukawa
- Hiroshima Research Center for Healthy Aging (HiHA), Division of Biological and Life Sciences, Graduate School of Integrated Sciences for Life, Higashi-Hiroshima, Japan
| | - Takashi Toda
- Hiroshima Research Center for Healthy Aging (HiHA), Division of Biological and Life Sciences, Graduate School of Integrated Sciences for Life, Higashi-Hiroshima, Japan
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Schenstrøm SM, Rebula CA, Tatham MH, Hendus-Altenburger R, Jourdain I, Hay RT, Kragelund BB, Hartmann-Petersen R. Expanded Interactome of the Intrinsically Disordered Protein Dss1. Cell Rep 2018; 25:862-870. [PMID: 30355493 PMCID: PMC6218214 DOI: 10.1016/j.celrep.2018.09.080] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 04/24/2018] [Accepted: 09/25/2018] [Indexed: 02/07/2023] Open
Abstract
Dss1 (also known as Sem1) is a conserved, intrinsically disordered protein with a remarkably broad functional diversity. It is a proteasome subunit but also associates with the BRCA2, RPA, Csn12-Thp1, and TREX-2 complexes. Accordingly, Dss1 functions in protein degradation, DNA repair, transcription, and mRNA export. Here in Schizosaccharomyces pombe, we expand its interactome further to include eIF3, the COP9 signalosome, and the mitotic septins. Within its intrinsically disordered ensemble, Dss1 forms a transiently populated C-terminal helix that dynamically interacts with and shields a central binding region. The helix interfered with the interaction to ATP-citrate lyase but was required for septin binding, and in strains lacking Dss1, ATP-citrate lyase solubility was reduced and septin rings were more persistent. Thus, even weak, transient interactions within Dss1 may dynamically rewire its interactome.
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Affiliation(s)
- Signe M Schenstrøm
- Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, 2200 Copenhagen N, Denmark
| | - Caio A Rebula
- Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, 2200 Copenhagen N, Denmark
| | - Michael H Tatham
- Centre for Gene Regulation and Expression, Sir James Black Centre, School of Life Sciences, University of Dundee, Dundee DD1 5EH, UK
| | - Ruth Hendus-Altenburger
- Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, 2200 Copenhagen N, Denmark
| | - Isabelle Jourdain
- College of Life and Environmental Sciences, University of Exeter, Geoffrey Pope Building, Stocker Road, Exeter EX4 4QD, UK
| | - Ronald T Hay
- Centre for Gene Regulation and Expression, Sir James Black Centre, School of Life Sciences, University of Dundee, Dundee DD1 5EH, UK
| | - Birthe B Kragelund
- Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, 2200 Copenhagen N, Denmark
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Kampmeyer C, Karakostova A, Schenstrøm SM, Abildgaard AB, Lauridsen AM, Jourdain I, Hartmann-Petersen R. The exocyst subunit Sec3 is regulated by a protein quality control pathway. J Biol Chem 2017; 292:15240-15253. [PMID: 28765280 DOI: 10.1074/jbc.m117.789867] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Revised: 07/19/2017] [Indexed: 02/03/2023] Open
Abstract
Exocytosis involves fusion of secretory vesicles with the plasma membrane, thereby delivering membrane proteins to the cell surface and releasing material into the extracellular space. The tethering of the secretory vesicles before membrane fusion is mediated by the exocyst, an essential phylogenetically conserved octameric protein complex. Exocyst biogenesis is regulated by several processes, but the mechanisms by which the exocyst is degraded are unknown. Here, to unravel the components of the exocyst degradation pathway, we screened for extragenic suppressors of a temperature-sensitive fission yeast strain mutated in the exocyst subunit Sec3 (sec3-913). One of the suppressing DNAs encoded a truncated dominant-negative variant of the 26S proteasome subunit, Rpt2, indicating that exocyst degradation is controlled by the ubiquitin-proteasome system. The temperature-dependent growth defect of the sec3-913 strain was gene dosage-dependent and suppressed by blocking the proteasome, Hsp70-type molecular chaperones, the Pib1 E3 ubiquitin-protein ligase, and the deubiquitylating enzyme Ubp3. Moreover, defects in cell septation, exocytosis, and endocytosis in sec3 mutant strains were similarly alleviated by mutation of components in this pathway. We also found that, particularly under stress conditions, wild-type Sec3 degradation is regulated by Pib1 and the 26S proteasome. In conclusion, our results suggest that a cytosolic protein quality control pathway monitors folding and proteasome-dependent turnover of an exocyst subunit and, thereby, controls exocytosis in fission yeast.
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Affiliation(s)
- Caroline Kampmeyer
- From the Linderstrøm-Lang Center, Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, 2200 Copenhagen N, Denmark and
| | - Antonina Karakostova
- From the Linderstrøm-Lang Center, Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, 2200 Copenhagen N, Denmark and
| | - Signe M Schenstrøm
- From the Linderstrøm-Lang Center, Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, 2200 Copenhagen N, Denmark and
| | - Amanda B Abildgaard
- From the Linderstrøm-Lang Center, Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, 2200 Copenhagen N, Denmark and
| | - Anne-Marie Lauridsen
- From the Linderstrøm-Lang Center, Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, 2200 Copenhagen N, Denmark and
| | - Isabelle Jourdain
- the College of Life and Environmental Sciences, University of Exeter, Geoffrey Pope Building, Stocker Road, Exeter EX4 4QD, United Kingdom
| | - Rasmus Hartmann-Petersen
- From the Linderstrøm-Lang Center, Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, 2200 Copenhagen N, Denmark and
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Abstract
Exocytosis involves the fusion of intracellular secretory vesicles with the plasma membrane, thereby delivering integral membrane proteins to the cell surface and releasing material into the extracellular space. Importantly, exocytosis also provides a source of lipid moieties for membrane extension. The tethering of the secretory vesicle before docking and fusion with the plasma membrane is mediated by the exocyst complex, an evolutionary conserved octameric complex of proteins. Recent findings indicate that the exocyst complex also takes part in other intra-cellular processes besides secretion. These various functions seem to converge toward defining a direction of membrane growth in a range of systems from fungi to plants and from neurons to cilia. In this review we summarize the current knowledge of exocyst function in cell polarity, signaling and cell-cell communication and discuss implications for plant and animal health and disease.
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Affiliation(s)
| | - Michael J Deeks
- Biosciences, College of Life and Environmental Sciences, University of Exeter Exeter, UK
| | - Connor G Horton
- Biosciences, College of Life and Environmental Sciences, University of Exeter Exeter, UK
| | - Helen R Dawe
- Biosciences, College of Life and Environmental Sciences, University of Exeter Exeter, UK
| | - Isabelle Jourdain
- Biosciences, College of Life and Environmental Sciences, University of Exeter Exeter, UK
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Knorr M, Jourdain I, Mohamed AS, Khatyr A, Koller SG, Strohmann C. Synthesis and reactivity of bis(diphenylphosphino)amine-bridged heterobimetallic iron–platinum μ-isonitrile and μ-aminocarbyne complexes. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2014.12.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [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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Mohamed AS, Jourdain I, Knorr M, Rousselin Y, Kubicki MM. Crystal structure of tricarbonyl(μ-diphenylphosphido-κ 2P: P)(methyldiphenylsilyl-κ Si)bis(triphenylphosphane-κ P)iron(II)platinum(0)( Fe— Pt). Acta Crystallogr E Crystallogr Commun 2015; 71:241-3. [PMID: 25878830 PMCID: PMC4384561 DOI: 10.1107/s2056989015001565] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 01/23/2015] [Indexed: 12/04/2022]
Abstract
The title compound belongs to the large family of heterodinuclear phosphide-bridged complexes. The Fe—Pt bond is of 2.7738 (4) Å and there is an unprecedented arrangement of the silyl ligand in a trans-position with respect to the metal–metal vector in the family of phosphide-bridged iron–platinum heterobimetallics. The title compound, [FePt(C12H10P)(C13H13Si)(C18H15P)2(CO)3]·0.5CH2Cl2, represents an example of a phosphido-bridged heterobimetallic silyl complex; these are interesting precursors for the coordination and activation of small unsaturated organic molecules. The μ2-PPh2 ligand spans the iron and platinum atoms, which are connected via a metal–metal bond of 2.7738 (4) Å. In contrast to most other complexes of the [(OC)3Fe(SiR3)(μ-PR2)PtL2] family, where the iron-bound SiR3 group is trans-arranged with respect to the μ2-PPh2 ligand, the SiPh2Me ligand is roughly collinear with the Fe–Pt vector [Si—Fe—Pt = 169.07 (3)°].
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13
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Jourdain I, Knorr M, Strohmann C, Unkelbach C, Rojo S, Gómez-Iglesias P, Villafañe F. Reactivity of Silyl-Substituted Iron–Platinum Hydride Complexes toward Unsaturated Molecules: 4. Insertion of Fluorinated Aromatic Alkynes into the Platinum–Hydride Bond. Synthesis and Reactivity of Heterobimetallic Dimetallacylopentenone, Dimetallacyclobutene, μ-Vinylidene, and μ2-σ-Alkenyl Complexes. Organometallics 2013. [DOI: 10.1021/om4006438] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Isabelle Jourdain
- Institut UTINAM
UMR 6213, Équipe Matériaux et Surfaces Structurés, Université de Franche-Comté, 16 Route de Gray, 25030 Besançon, France
| | - Michael Knorr
- Institut UTINAM
UMR 6213, Équipe Matériaux et Surfaces Structurés, Université de Franche-Comté, 16 Route de Gray, 25030 Besançon, France
| | - Carsten Strohmann
- Technische Universität Dortmund, Anorganische Chemie, Otto-Hahn-Straße 6, 44227 Dortmund, Germany
| | - Christian Unkelbach
- Technische Universität Dortmund, Anorganische Chemie, Otto-Hahn-Straße 6, 44227 Dortmund, Germany
| | - Saúl Rojo
- IU CINQUIMA/Quı́mica Inorgánica,
Facultad de Ciencias, Campus Miguel Delibes, Universidad de Valladolid, 47011 Valladolid, Spain
| | - Patricia Gómez-Iglesias
- IU CINQUIMA/Quı́mica Inorgánica,
Facultad de Ciencias, Campus Miguel Delibes, Universidad de Valladolid, 47011 Valladolid, Spain
| | - Fernando Villafañe
- IU CINQUIMA/Quı́mica Inorgánica,
Facultad de Ciencias, Campus Miguel Delibes, Universidad de Valladolid, 47011 Valladolid, Spain
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Jourdain I, Brzezińska EA, Toda T. Fission yeast Nod1 is a component of cortical nodes involved in cell size control and division site placement. PLoS One 2013; 8:e54142. [PMID: 23349808 PMCID: PMC3547912 DOI: 10.1371/journal.pone.0054142] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Accepted: 12/05/2012] [Indexed: 11/19/2022] Open
Abstract
Most cells enter mitosis once they have reached a defined size. In the fission yeast Schizosaccharomyces pombe, mitotic entry is orchestrated by a geometry-sensing mechanism that involves the Cdk1/Cdc2-inhibiting Wee1 kinase. The factors upstream of Wee1 gather together in interphase to form a characteristic medial and cortical belt of nodes. Nodes are also considered to be precursors of the cytokinesis contractile actomyosin ring (CAR). Here we describe a new component of the interphase nodes and cytokinesis rings, which we named Nod1. Consistent with its role in cell size control at division, nod1Δ cells were elongated and epistatic with regulators of Wee1. Through biochemical and localisation studies, we placed Nod1 in a complex with the Rho-guanine nucleotide exchange factor Gef2. Nod1 and Gef2 mutually recruited each other in nodes and Nod1 also assembles Gef2 in rings. Like gef2Δ, nod1Δ cells showed a mild displacement of their division plane and this phenotype was severely exacerbated when the parallel Polo kinase pathway was also compromised. We conclude that Nod1 specifies the division site by localising Gef2 to the mitotic cell middle. Previous work showed that Gef2 in turn anchors factors that control the spatio-temporal recruitment of the actin nucleation machinery. It is believed that the actin filaments originated from the nodes pull nodes together into a single contractile ring. Surprisingly however, we found that node proteins could form pre-ring helical filaments in a cdc12-112 mutant in which nucleation of the actin ring is impaired. Furthermore, the deletion of either nod1 or gef2 created an un-expected situation where different ring components were recruited sequentially rather than simultaneously. At later stages of cytokinesis, these various rings appeared inter-fitted rather than merged. This study brings a new slant to the understanding of CAR assembly and function.
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Affiliation(s)
- Isabelle Jourdain
- Cell Regulation Laboratory, London Research Institute, Cancer Research UK, London, United Kingdom
| | - Elspeth A. Brzezińska
- Cell Regulation Laboratory, London Research Institute, Cancer Research UK, London, United Kingdom
| | - Takashi Toda
- Cell Regulation Laboratory, London Research Institute, Cancer Research UK, London, United Kingdom
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Jourdain I, Dooley HC, Toda T. Fission yeast sec3 bridges the exocyst complex to the actin cytoskeleton. Traffic 2012; 13:1481-95. [PMID: 22891673 PMCID: PMC3531892 DOI: 10.1111/j.1600-0854.2012.01408.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Revised: 08/10/2012] [Accepted: 08/14/2012] [Indexed: 12/29/2022]
Abstract
The exocyst complex tethers post-Golgi secretory vesicles to the plasma membrane prior to docking and fusion. In this study, we identify Sec3, the missing component of the Schizosaccharomyces pombe exocyst complex (SpSec3). SpSec3 shares many properties with its orthologs, and its mutants are rescued by human Sec3/EXOC1. Although involved in exocytosis, SpSec3 does not appear to mark the site of exocyst complex assembly at the plasma membrane. It does, however, mark the sites of actin cytoskeleton recruitment and controls the organization of all three yeast actin structures: the actin cables, endocytic actin patches and actomyosin ring. Specifically, SpSec3 physically interacts with For3 and sec3 mutants have no actin cables as a result of a failure to polarize this nucleating formin. SpSec3 also interacts with actin patch components and sec3 mutants have depolarized actin patches of reduced endocytic capacity. Finally, the constriction and disassembly of the cytokinetic actomyosin ring is compromised in these sec3 mutant cells. We propose that a role of SpSec3 is to spatially couple actin machineries and their independently polarized regulators. As a consequence of its dual role in secretion and actin organization, Sec3 appears as a major co-ordinator of cell morphology in fission yeast.
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Affiliation(s)
- Isabelle Jourdain
- Cell Regulation Laboratory, London Research Institute, Cancer Research UK, 44 Lincoln's Inn Fields, London, WC2A 3LY, UK.
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Jourdain I, Knorr M, Koller SG, Strohmann C. [μ-Bis(diphenylphosphanyl)methane]tricarbonyl(μ- p-toluenesulfonylmethyl isocyanato)(triphenylphosphane)ironplatinum( Fe— Pt). Acta Crystallogr Sect E Struct Rep Online 2012; 68:m331-2. [PMID: 22412466 PMCID: PMC3297276 DOI: 10.1107/s1600536812004023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Accepted: 01/30/2012] [Indexed: 11/10/2022]
Abstract
The title compound, [FePt(C9H9NO2S)(C18H15P)(C25H22P2)(CO)3], represents a rare example of an isonitrile-bridged heterobimetallic complex (here Pt and Fe) and is an interesting precursor for the preparation of heterodinuclear μ-aminocarbyne complexes, since the basic imine-type N atom of the μ2-C=N–R ligand readily undergoes addition with various electrophiles to afford iminium-like salts. In the crystal, the almost symmetrically bridging μ2-C=N-R ligand (neglecting the different atomic radii of Fe and Pt) is strongly bent towards the Fe(CO)3 fragment, with a C=N-R angle of only 121.1 (4)°.
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Jourdain I, Gachet Y, Hyams JS. The dynamin related protein Dnm1 fragments mitochondria in a microtubule-dependent manner during the fission yeast cell cycle. ACTA ACUST UNITED AC 2009; 66:509-23. [PMID: 19373772 DOI: 10.1002/cm.20351] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Mitochondria are dynamic organelles that undergo cycles of fission and fusion. In the fission yeast, Schizosaccharomyces pombe, mitochondria align with microtubules and mitochondrial integrity is dependent upon an intact microtubule cytoskeleton. Here we show that mitochondria re-organize during the cell cycle and that this process is both dynamin- and microtubule-dependent. Microtubule depolymerization results in mitochondrial fragmentation but only when the dynamin-related protein Dnm1 is present. Mitochondrial fusion is, on the other hand, microtubule-independent. dnm1Delta cells, besides showing extensively fused mitochondria, are specifically resistant to anti-microtubule drugs. Dnm1-YFP localizes to foci at sites of mitochondrial severing which occupy the interface between adjacent nucleoids, suggesting the existence of defined mitochondrial "territories," each of which contains a nucleoid. Such territories are lost in dnm1Delta in which nucleoids become aggregated. Mitochondrial ends exhibit motile behavior, extending towards and retracting from the cell poles, independently of the cytoskeleton. We conclude that: (a) mitochondria are organized by microtubules in fission yeast but are not moved by them; (b) Dnm1 mediates mitochondrial fission during interphasic growth and at cell division; (c) the interaction between microtubules and mitochondria, either directly or indirectly via Dnm1, not only modifies the disposition of mitochondria it also modifies the behavior of microtubules. Cell Motil. Cytoskeleton 2009. (c) 2009 Wiley-Liss, Inc.
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Affiliation(s)
- Isabelle Jourdain
- Institute of Molecular Biosciences, Massey University, Private Bag 11 222, Palmerston North, New Zealand
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Röthlisberger S, Jourdain I, Johnson C, Takegawa K, Hyams JS. The dynamin-related protein Vps1 regulates vacuole fission, fusion and tubulation in the fission yeast, Schizosaccharomyces pombe. Fungal Genet Biol 2009; 46:927-35. [PMID: 19643199 DOI: 10.1016/j.fgb.2009.07.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2009] [Revised: 07/13/2009] [Accepted: 07/19/2009] [Indexed: 01/07/2023]
Abstract
Fission yeast cells lacking the dynamin-related protein (DRP) Vps1 had smaller vacuoles with reduced capacity for both fusion and fission in response to hypotonic and hypertonic conditions respectively. vps1Delta cells showed normal vacuolar protein sorting, actin organisation and endocytosis. Over-expression of vps1 transformed vacuoles from spherical to tubular. Tubule formation was enhanced in fission conditions and required the Rab protein Ypt7. Vacuole tubulation by Vps1 was more extensive in the absence of a second DRP, Dnm1. Both dnm1Delta and the double mutant vps1Delta dnm1Delta showed vacuole fission defects similar to that of vps1Delta. Over-expression of vps1 in dnm1Delta, or of dnm1 in vps1Delta failed to rescue this phenotype. Over-expression of dnm1 in wild-type cells, on the other hand, induced vacuole fission. Our results are consistent with a model of vacuole fission in which Vps1 creates a tubule of an appropriate diameter for subsequent scission by Dnm1.
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Affiliation(s)
- Sarah Röthlisberger
- Institute of Molecular Biosciences, Massey University, Private Bag 11222, Palmerston North, New Zealand
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Eaton CJ, Jourdain I, Foster SJ, Hyams JS, Scott B. Functional analysis of a fungal endophyte stress-activated MAP kinase. Curr Genet 2008; 53:163-74. [PMID: 18188569 DOI: 10.1007/s00294-007-0174-6] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2007] [Revised: 12/17/2007] [Accepted: 12/18/2007] [Indexed: 11/25/2022]
Abstract
The ability of fungi to sense and respond rapidly to environmental stress is crucial for their survival in the wild. One of the most important pathways involved in this response is the stress-activated MAP (mitogen-activated protein) kinase pathway. We report here on the isolation of the stress-activated MAP kinase, sakA, from the fungal endophyte Epichloë festucae. Complementation of the stress sensitivity and cell cycle defects of an Schizosaccharomyces pombe sty1Delta mutant with sakA confirmed it encodes a functional MAP kinase. Analysis of an E. festucae DeltasakA mutant revealed sakA is essential for growth under conditions of temperature and osmotic stress in culture, and for sensitivity to the fungicide fludioxonil. However, the DeltasakA mutant shows no increased sensitivity to hydrogen peroxide. Given sakA can rescue the sty1Delta mutant from sensitivity to oxidative stress, SakA has the potential to sense and transduce oxidative stress signals. The DeltasakA mutant is also defective in conidia formation, suggesting a role for SakA in asexual development of E. festucae. The detection of elevated hydrogen peroxide production in the DeltasakA mutant suggests there may be a link between MAP kinase and ROS (reactive oxygen species) signalling pathways in E. festucae.
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Affiliation(s)
- Carla J Eaton
- Institute of Molecular BioSciences, Massey University, Private Bag 11 222, Palmerston North, New Zealand
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Jourdain I, Sontam D, Johnson C, Dillies C, Hyams JS. Dynamin-dependent biogenesis, cell cycle regulation and mitochondrial association of peroxisomes in fission yeast. Traffic 2007; 9:353-65. [PMID: 18088324 DOI: 10.1111/j.1600-0854.2007.00685.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Peroxisomes were visualized for the first time in living fission yeast cells. In small, newly divided cells, the number of peroxisomes was low but increased in parallel with the increase in cell length/volume that accompanies cell cycle progression. In cells grown in oleic acid, both the size and the number of peroxisomes increased. The peroxisomal inventory of cells lacking the dynamin-related proteins Dnm1 or Vps1 was similar to that in wild type. By contrast, cells of the double mutant dnm1Delta vps1Delta contained either no peroxisomes at all or a small number of morphologically aberrant organelles. Peroxisomes exhibited either local Brownian movement or longer-range linear displacements, which continued in the absence of either microtubules or actin filaments. On the contrary, directed peroxisome motility appeared to occur in association with mitochondria and may be an indirect function of intrinsic mitochondrial dynamics. We conclude that peroxisomes are present in fission yeast and that Dnm1 and Vps1 act redundantly in peroxisome biogenesis, which is under cell cycle control. Peroxisome movement is independent of the cytoskeleton but is coupled to mitochondrial dynamics.
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Affiliation(s)
- Isabelle Jourdain
- Institute of Molecular Biosciences, Massey University, Private Bag 11222, Palmerston North, New Zealand.
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Peindy HN, Guyon F, Jourdain I, Knorr M, Schildbach D, Strohmann C. 1,1,2,2-Tetramethyl-1,2-bis(phenylthiomethyl)disilane, a Flexible Ligand for the Construction of Macrocyclic, Mesocyclic, and Bridged Dithioether Complexes. Synthesis of the Bis-silylated Olefins Z-(PhSCH2)Me2SiC(H)C(Ar)SiMe2(CH2SPh) by Catalytic Activation of the Si−Si Bond. Organometallics 2006. [DOI: 10.1021/om0489812] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Harmel N. Peindy
- Laboratoire de Chimie des Matériaux et Interfaces, Faculté des Sciences et des Techniques, Université de Franche-Comté, 16, Route de Gray, 25030 Besançon Cedex, France, and Institut für Anorganische Chemie der Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Fabrice Guyon
- Laboratoire de Chimie des Matériaux et Interfaces, Faculté des Sciences et des Techniques, Université de Franche-Comté, 16, Route de Gray, 25030 Besançon Cedex, France, and Institut für Anorganische Chemie der Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Isabelle Jourdain
- Laboratoire de Chimie des Matériaux et Interfaces, Faculté des Sciences et des Techniques, Université de Franche-Comté, 16, Route de Gray, 25030 Besançon Cedex, France, and Institut für Anorganische Chemie der Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Michael Knorr
- Laboratoire de Chimie des Matériaux et Interfaces, Faculté des Sciences et des Techniques, Université de Franche-Comté, 16, Route de Gray, 25030 Besançon Cedex, France, and Institut für Anorganische Chemie der Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Daniel Schildbach
- Laboratoire de Chimie des Matériaux et Interfaces, Faculté des Sciences et des Techniques, Université de Franche-Comté, 16, Route de Gray, 25030 Besançon Cedex, France, and Institut für Anorganische Chemie der Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Carsten Strohmann
- Laboratoire de Chimie des Matériaux et Interfaces, Faculté des Sciences et des Techniques, Université de Franche-Comté, 16, Route de Gray, 25030 Besançon Cedex, France, and Institut für Anorganische Chemie der Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
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Knorr M, Jourdain I, Braunstein P, Strohmann C, Tiripicchio A, Ugozzoli F. Insertion reactions of alkynes and organic isocyanides into the palladium–carbon bond of dimetallic Fe–Pd alkoxysilyl complexes. Dalton Trans 2006:5248-58. [PMID: 17088964 DOI: 10.1039/b610324c] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Insertion of MeO(2)C-C[triple bond]C-CO(2)Me (DMAD) into the Pd-C bond of the heterodimetallic complex [(OC)(3)F[upper bond 1 start]e{mu-Si(OMe)(2)([lower bond 1 start]OMe)}(mu-dppm)P[lower bond 1 end][upper bond 1 end]d(dmba-C)] (2) (dppm = Ph(2)PCH(2)PPh(2), dmba-C = metallated dimethylbenzylamine) and [(OC)(3){(MeO)(3)Si}F[upper bond 1 start]e(mu-dppm)P[upper bond 1 end]d(8-mq-C,N)] (3) (8-mq-C,N = cyclometallated 8-methylquinoline) yielded the sigma-alkenyl complexes [(OC)(3)F[upper bond 1 start]e{mu-Si(OMe)(2)([lower bond 1 start]OMe)}(mu-dppm)P[lower bond 1 end][upper bond 1 end]d{C(CO(2)Me)=C(CO(2)Me)(o-C(6)H(4)CH(2)NMe(2))}] (7) and [(OC)(3)F[upper bond 1 start]e{mu-Si(OMe)(2)([lower bond 1 start]OMe)}(mu-dppm)P[lower bond 1 end][upper bond 1 end]d{C(CO(2)Me)[double bond, length as m-dash]C(CO(2)Me)(CH(2)C(9)H(6)N)}] (8), respectively. The latter afforded the adduct [(OC)(3){(MeO)(3)Si}F[upper bond 1 start]e(mu-dppm)P[upper bond 1 end]d{C(CO(2)Me)=C(CO(2)Me)(CH(2)C(9)H(6)N)}(CNBu(t))] (9) upon reaction with 1 equiv. of Bu(t)NC. The heterodinuclear sigma-butadienyl complexes [(OC)(3)F[upper bond 1 start]e{mu-Si(OMe)(2)([lower bond 1 start]OMe)}(mu-dppm)P[lower bond 1 end][upper bond 1 end]d{C(Ph=C(Ph)C(CO(2)Me)=(CO(2)Me)(o-C(6)H(4)CH(2)NMe(2))}] (11) and [(OC)(3)F[upper bond 1 start]e{mu-Si(OMe)(2)([lower bond 1 start]OMe)}(mu-dppm)P[lower bond 1 end][upper bond 1 end]d{C(Ph)=C(CO(2)Et)C(Ph)=C(CO(2)Et)(CH(2)C(9)H(6)N)}] (13) have been obtained by reaction of the metallate K[Fe{Si(OMe)(3)}(CO)(3)(dppm-P)] (dppm = Ph(2)PCH(2)PPh(2)) with [P[upper bond 1 start]dCl{C(Ph)=C(Ph)C(CO(2)Me)=C(CO(2)Me)(o-C(6)H(4)CH(2)N[upper bond 1 end]Me(2))}] or [P[upper bond 1 start]dCl{C(Ph)=C(CO(2)Et)C(Ph)=(CO(2)Et)}(CH(2)C(9)H(6)N[upper bond 1 end])], respectively. Monoinsertion of various organic isocyanides RNC into the Pd-C bond of 2 and 3 afforded the corresponding heterometallic iminoacyl complexes. In the case of complexes [(OC)(3){(MeO)(3)Si}F[upper bond 1 start]e(mu-dppm)P[upper bond 1 end][upper bond 1 start]d{C=(NR)(CH(2)C(9)H(6)N[upper bond 1 end])}] (15a R = Ph, 15b R = xylyl), a static six-membered C,N chelate is formed at the Pd centre, in contrast to the situation in [(OC)(3)F[upper bond 1 start]e{mu-Si(OMe)(2)([lower bond 1 start]OMe)}(mu-dppm)P[lower bond 1 end][upper bond 1 end]d{C(=NR)(o-C(6)H(4)CH(2)NMe(2))}] (14a R = o-anisyl, 14b R = 2,6-xylyl) where formation of a mu-eta(2)-Si-O bridge is preferred over NMe(2) coordination. The outcome of the reaction of the dimetallic alkyl complex [(OC)(3)F[upper bond 1 start]e{mu-Si(OMe)(2)([lower bond 1 start]OMe)}(mu-dppm)P[lower bond 1 end][upper bond 1 end]dMe] with RNC depends both on the stoichiometry and the electronic donor properties of the isocyanide employed for the migratory insertion process. In the case of o-anisylisocyanide, the iminoacyl complex [(OC)(3)F[upper bond 1 start]e{mu-Si(OMe)(2)([lower bond 1 start]OMe)}(mu-dppm)P[lower bond 1 end][upper bond 1 end]d{C(=N-o-anisyl)Me}] (16) results from the reaction in a 1 : 1 ratio. Addition of three equiv. of o-anisylisocyanide affords the tris(insertion) product [(OC)(3)F[upper bond 1 start]e{mu-Si(OMe)(2)([lower bond 1 start]OMe)}(mu-dppm)P[lower bond 1 end][upper bond 1 end]d{[C(=N-o-anisyl)](3)Me}] (18). After addition of a fourth equivalent of o-anisylNC, exclusive formation of the isocyanide adduct [(OC)(3){(MeO)(3)Si}F[upper bond 1 start]e(mu-dppm)P[upper bond 1 end]d{[C(=N-o-anisyl)](3)Me}(CN-o-anisyl)] (19) was spectroscopically evidenced. In the complex [(OC)(3)F[upper bond 1 start]e{mu-Si(OMe)(2)([lower bond 1 start]OMe)}(mu-dppm)P[lower bond 1 end][upper bond 1 end]d{[C(=N-o-C(6)H(4)COCH(2))](2)Me}] (20), the sigma-bound diazabutadienyl unit is part of a 12-membered organic macrocyle which results from bis(insertion) of 1,2-bis(2-isocyanophenoxy)ethane into the Pd-Me bond of the precursor complex [(OC)(3)F[upper bond 1 start]e{mu-Si(OMe)(2)([lower bond 1 start]OMe)}(mu-dppm)P[lower bond 1 end][upper bond 1 end]dMe]. In contrast, addition of two equivalents of tert-butylisocyanide to a solution of the latter afforded [(OC)(3){(MeO)(3)Si}F[upper bond 1 start]Fe(mu-dppm)P[upper bond 1 end]d{C(=NBu(t))Me}(CNBu(t))] (21) in which both a terminal and an inserted isocyanide ligand are coordinated to the Pd centre. In all cases, there was no evidence for competing CO substitution at the Fe(CO)(3) fragment by RNC. The molecular structures of the insertion products 8 x CH(2)Cl(2) and 16 x CH(2)Cl(2) have been determined by X-ray diffraction.
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Affiliation(s)
- Michael Knorr
- Laboratoire de Chimie des Matériaux et Interfaces, Université de Franche-Comté, Faculté des Sciences et des Techniques, 16 Route de Gray, 25030 Besançon Cedex, France.
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Clément MJ, Jourdain I, Lachkar S, Savarin P, Gigant B, Knossow M, Toma F, Sobel A, Curmi PA. N-Terminal Stathmin-like Peptides Bind Tubulin and Impede Microtubule Assembly†. Biochemistry 2005; 44:14616-25. [PMID: 16262261 DOI: 10.1021/bi0512492] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Microtubules are major cytoskeletal components involved in numerous cellular functions such as mitosis, cell motility, or intracellular traffic. These cylindrical polymers of alphabeta-tubulin assemble in a closely regulated dynamic manner. We have shown that the stathmin family proteins sequester tubulin in a nonpolymerizable ternary complex, through their stathmin-like domains (SLD) and thus contribute to the regulation of microtubule dynamics. We demonstrate here that short peptides derived from the N-terminal part of SLDs impede tubulin polymerization with various efficiencies and that phosphorylation of the most potent of these peptides reduces its efficiency as in full-length stathmin. To understand the mechanism of action of these peptides, we undertook a NMR-based structural analysis of the peptide-tubulin interaction with the most efficient peptide (I19L). Our results show that, while disordered when free in solution, I19L folds into a beta-hairpin upon binding to tubulin. We further identified, by means of saturation transfer difference NMR, hydrophobic residues located on the beta2-strand of I19L that are involved in its tubulin binding. These structural data were used together with tubulin atomic coordinates from the tubulin/RB3-SLD crystal structure to model the I19L/tubulin interaction. The model agrees with I19L acting through an autonomous tubulin capping capability to impede tubulin polymerization and provides information to help understand the variation of efficiency against tubulin polymerization among the peptides tested. Altogether these results enlighten the mechanism of tubulin sequestration by SLDs, while they pave the way for the development of protein-based compounds aimed at interfering with tubulin polymerization.
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Affiliation(s)
- Marie-Jeanne Clément
- Laboratoire Structure et Reconnaissance des Biomolécules, EA3637, Université Evry-Val d'Essonne, Evry, F-91025 France
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Knorr M, Jourdain I, Villafañe F, Strohmann C. Reactivity of silyl-substituted heterobimetallic iron–platinum hydride complexes towards unsaturated molecules: Part II. Insertion of trifluoropropyne and hexafluorobutyne into the platinum–hydride bond. J Organomet Chem 2005. [DOI: 10.1016/j.jorganchem.2004.11.052] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Jourdain I, Lachkar S, Charbaut E, Gigant B, Knossow M, Sobel A, Curmi PA. A synergistic relationship between three regions of stathmin family proteins is required for the formation of a stable complex with tubulin. Biochem J 2004; 378:877-88. [PMID: 14670078 PMCID: PMC1224029 DOI: 10.1042/bj20031413] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2003] [Revised: 12/09/2003] [Accepted: 12/11/2003] [Indexed: 11/17/2022]
Abstract
Stathmin is a ubiquitous 17 kDa cytosolic phosphoprotein proposed to play a general role in the integration and relay of intracellular signalling pathways. It is believed to regulate microtubule dynamics by sequestering tubulin in a complex made of two tubulin heterodimers per stathmin molecule (T2S complex). The other proteins of the stathmin family can also bind two tubulin heterodimers through their SLD (stathmin-like domain), but the different tubulin:SLD complexes display varying stabilities. In this study, we analysed the relative influence of three regions of SLDs on the interaction with tubulin and the mechanistic processes that lead to its sequestration. Tubulin-binding properties of fragments and chimaeras of stathmin and RB3(SLD) were studied in vitro by tubulin polymerization, size-exclusion chromatography and surface plasmon resonance assays. Our results show that the N-terminal region of SLDs favours the binding of the first tubulin heterodimer and that the second C-terminal tubulinbinding site confers the specific stability of a given tubulin:SLD complex. Our results highlight the molecular processes by which tubulin co-operatively interacts with the SLDs. This knowledge may contribute to drug development aimed at disturbing microtubules that could be used for the treatment of cancer.
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Affiliation(s)
- Isabelle Jourdain
- Signalisation et Différenciation Cellulaires dans les Systèmes Nerveux et Musculaire, U440 Institut National de la Santé et de la Recherche Médicale/Université Pierre et Marie Curie, Paris, France
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Ravelli RBG, Gigant B, Curmi PA, Jourdain I, Lachkar S, Sobel A, Knossow M. Insight into tubulin regulation from a complex with colchicine and a stathmin-like domain. Nature 2004; 428:198-202. [PMID: 15014504 DOI: 10.1038/nature02393] [Citation(s) in RCA: 1219] [Impact Index Per Article: 61.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2003] [Accepted: 02/04/2004] [Indexed: 02/08/2023]
Abstract
Microtubules are cytoskeletal polymers of tubulin involved in many cellular functions. Their dynamic instability is controlled by numerous compounds and proteins, including colchicine and stathmin family proteins. The way in which microtubule instability is regulated at the molecular level has remained elusive, mainly because of the lack of appropriate structural data. Here, we present the structure, at 3.5 A resolution, of tubulin in complex with colchicine and with the stathmin-like domain (SLD) of RB3. It shows the interaction of RB3-SLD with two tubulin heterodimers in a curved complex capped by the SLD amino-terminal domain, which prevents the incorporation of the complexed tubulin into microtubules. A comparison with the structure of tubulin in protofilaments shows changes in the subunits of tubulin as it switches from its straight conformation to a curved one. These changes correlate with the loss of lateral contacts and provide a rationale for the rapid microtubule depolymerization characteristic of dynamic instability. Moreover, the tubulin-colchicine complex sheds light on the mechanism of colchicine's activity: we show that colchicine binds at a location where it prevents curved tubulin from adopting a straight structure, which inhibits assembly.
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Affiliation(s)
- Raimond B G Ravelli
- European Molecular Biology Laboratory (EMBL), Grenoble Outstation, 6 rue Jules Horowitz, BP 181, 38042 Grenoble Cedex 9, France
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Knorr M, Jourdain I, Crini G, Frank K, Sachdev H, Strohmann C. Synthesis, Reactivity and Molecular Structures of Bis(diphenylphosphanyl)methane-Bridged Heterobimetallic Iron−Platinum Isocyanide Complexes: Breaking and Formation of Metal−Metal Bonds. Eur J Inorg Chem 2002. [DOI: 10.1002/1099-0682(200209)2002:9<2419::aid-ejic2419>3.0.co;2-u] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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