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Joly N, Colella A, Mendy ME, Mbaye MD, Gaillard S, Poater A, Renaud JL. Blue-Light Induced Iron-Catalyzed Synthesis of γ,δ-Unsaturated Ketones. ChemSusChem 2024; 17:e202301472. [PMID: 38010264 DOI: 10.1002/cssc.202301472] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/24/2023] [Accepted: 11/24/2023] [Indexed: 11/29/2023]
Abstract
A visible-light-induced iron-catalyzed α-alkylation of ketones with allylic and propargylic alcohols as pro-electrophiles is reported. The diaminocyclopentadienone iron tricarbonyl complex plays a dual role by harvesting light and facilitating dehydrogenation and reduction steps without the help of any exogenous photosensitizer. γ,δ-Unsaturated ketones can now be accessed through this borrowing hydrogen methodology at room temperature. Mechanistic investigations revealed that the steric hindrance on the δ-position of either the dienone or ene-ynone intermediate is the key feature to prevent or decrease the competitive 1,6-reduction (and consequently the formation of the saturated ketone) and to favor the synthesis of a set of non-conjugated enones and ynones.
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Affiliation(s)
- Nicolas Joly
- Normandie Univ., LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000, Caen, France
- Departament de Química, Institut de Química Computacional i Catàlisi (IQCC), University of Girona, c/ Mª Aurèlia Capmany 69, 17003, Girona, Catalonia, Spain
| | - Alessandro Colella
- Normandie Univ., LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000, Caen, France
| | - Monique-Edwige Mendy
- Normandie Univ., LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000, Caen, France
- Université Assane Seck de Ziguinchor BP 523, Ziguinchor, Sénégal
| | | | - Sylvain Gaillard
- Normandie Univ., LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000, Caen, France
| | - Albert Poater
- Departament de Química, Institut de Química Computacional i Catàlisi (IQCC), University of Girona, c/ Mª Aurèlia Capmany 69, 17003, Girona, Catalonia, Spain
| | - Jean-Luc Renaud
- Normandie Univ., LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000, Caen, France
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, UMR 8232, 75005, Paris, France
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2
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Beaumale E, Van Hove L, Pintard L, Joly N. Microtubule-binding domains in Katanin p80 subunit are essential for severing activity in C. elegans. J Cell Biol 2024; 223:e202308023. [PMID: 38329452 PMCID: PMC10853069 DOI: 10.1083/jcb.202308023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 11/22/2023] [Accepted: 01/09/2024] [Indexed: 02/09/2024] Open
Abstract
Microtubule-severing enzymes (MSEs), such as Katanin, Spastin, and Fidgetin play essential roles in cell division and neurogenesis. They damage the microtubule (MT) lattice, which can either destroy or amplify the MT cytoskeleton, depending on the cellular context. However, little is known about how they interact with their substrates. We have identified the microtubule-binding domains (MTBD) required for Katanin function in C. elegans. Katanin is a heterohexamer of dimers containing a catalytic subunit p60 and a regulatory subunit p80, both of which are essential for female meiotic spindle assembly. Here, we report that p80-like(MEI-2) dictates Katanin binding to MTs via two MTBDs composed of basic patches. Substituting these patches reduces Katanin binding to MTs, compromising its function in female meiotic-spindle assembly. Structural alignments of p80-like(MEI-2) with p80s from different species revealed that the MTBDs are evolutionarily conserved, even if the specific amino acids involved vary. Our findings highlight the critical importance of the regulatory subunit (p80) in providing MT binding to the Katanin complex.
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Affiliation(s)
- Eva Beaumale
- Université Paris Cité, CNRS, Institut Jacques Monod, Paris, France
| | - Lucie Van Hove
- Université Paris Cité, CNRS, Institut Jacques Monod, Paris, France
| | - Lionel Pintard
- Université Paris Cité, CNRS, Institut Jacques Monod, Paris, France
| | - Nicolas Joly
- Université Paris Cité, CNRS, Institut Jacques Monod, Paris, France
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3
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Spalletta A, Joly N, Martin P. Latest Trends in Lipase-Catalyzed Synthesis of Ester Carbohydrate Surfactants: From Key Parameters to Opportunities and Future Development. Int J Mol Sci 2024; 25:3727. [PMID: 38612540 PMCID: PMC11012184 DOI: 10.3390/ijms25073727] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 03/22/2024] [Accepted: 03/23/2024] [Indexed: 04/14/2024] Open
Abstract
Carbohydrate-based surfactants are amphiphilic compounds containing hydrophilic moieties linked to hydrophobic aglycones. More specifically, carbohydrate esters are biosourced and biocompatible surfactants derived from inexpensive renewable raw materials (sugars and fatty acids). Their unique properties allow them to be used in various areas, such as the cosmetic, food, and medicine industries. These multi-applications have created a worldwide market for biobased surfactants and consequently expectations for their production. Biobased surfactants can be obtained from various processes, such as chemical synthesis or microorganism culture and surfactant purification. In accordance with the need for more sustainable and greener processes, the synthesis of these molecules by enzymatic pathways is an opportunity. This work presents a state-of-the-art lipase action mode, with a focus on the active sites of these proteins, and then on four essential parameters for optimizing the reaction: type of lipase, reaction medium, temperature, and ratio of substrates. Finally, this review discusses the latest trends and recent developments, showing the unlimited potential for optimization of such enzymatic syntheses.
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Affiliation(s)
| | - Nicolas Joly
- Unité Transformations & Agroressources, ULR7519, Université d’Artois-UniLaSalle, F-62408 Béthune, France; (A.S.); (P.M.)
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4
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Mushtaq Q, Joly N, Martin P, Qazi JI. Optimization of Alkali Treatment for Production of Fermentable Sugars and Phenolic Compounds from Potato Peel Waste Using Topographical Characterization and FTIR Spectroscopy. Molecules 2023; 28:7250. [PMID: 37959670 PMCID: PMC10648272 DOI: 10.3390/molecules28217250] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 10/18/2023] [Accepted: 10/20/2023] [Indexed: 11/15/2023] Open
Abstract
Potato peel waste (PPW) was utilized as a bio-template for the production of valuable compounds such as reducing sugars (RS), total sugar (TS) and total phenolic compounds (TPC). Two methods of alkali treatments, i.e., chemical (NaOH) and thermochemical (NaOH assisted with autoclaving) processes, were employed for the deconstruction of PPW. Response surface methodology (RSM) was used to study the effects of alkali concentration (0.6-1.0 w/v), substrate concentration (5-15 g) and time (4-8 h) on the extraction of RS, TS and TP from PPW. The application of alkali plus steam treatment in Box-Behnken design (BBD) with three levels yielded the optimum releases of RS, TS and TP as 7.163, 28.971 and 4.064 mg/mL, respectively, corresponding to 10% substrate loading, in 0.6% NaOH for 8 h. However, the alkali treatment reported optimum extractions of RS, TS and TP as 4.061, 17.432 and 2.993 mg/mL, respectively. The thermochemical pretreatment was proven a beneficial process as it led to higher productions of TP. FTIR and SEM were used to analyze the deterioration levels of the substrate. The present work was used to explore the sustainable management of PPW, which is a highly neglected substrate bioresource but is excessively dumped in open environment, raising environmental concerns. The cost-effective methods for the breakdown of PPW starch into fermentable sugars might be utilized to extract valuable compounds.
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Affiliation(s)
- Qudsia Mushtaq
- Microbial Biotechnology Laboratory, Institute of Zoology, University of the Punjab, New Campus, Lahore 54590, Pakistan;
| | - Nicolas Joly
- University Artois, Unilasalle, ULR7519—Unité Transformations & Agro-Ressources, F-62408 Béthune, France;
| | - Patrick Martin
- University Artois, Unilasalle, ULR7519—Unité Transformations & Agro-Ressources, F-62408 Béthune, France;
| | - Javed Iqbal Qazi
- Microbial Biotechnology Laboratory, Institute of Zoology, University of the Punjab, New Campus, Lahore 54590, Pakistan;
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Joly N, Chiaradia A, Georges JY, Saraux C. Unpacking the lifelong secrets of little penguins: individual quality, energy allocation, and stochasticity in defining fitness. Evolution 2023; 77:2056-2067. [PMID: 37410909 DOI: 10.1093/evolut/qpad126] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 06/17/2023] [Accepted: 07/04/2023] [Indexed: 07/08/2023]
Abstract
While the heterogeneity among individuals of a population is more and more documented, questions on the paths through which it arises, particularly whether it is linked to fixed heterogeneity or chance alone, are still widely debated. Here, we tested how individual quality, energy allocation trade-offs, and environmental stochasticity define individual fitness. To do so, we simultaneously investigated the contribution of 18 life-history traits to the fitness of breeding little penguins (Eudyptula minor), using a structural equation model. Fitness was highly variable amongst the 162 birds monitored over their entire lifespan. It increased with the individual penguin's ability to increase (a) the number of breeding events (i.e., living longer, breeding younger, breeding more often, and producing more second clutches) and (b) the breeding success per event through increased foraging performances (i.e., mass gained at sea). While all three processes (stochasticity, individual quality, and allocation trade-offs) affected fitness, interindividual variability in fitness was mainly driven by individual quality, birds consistently breeding earlier in the season and displaying higher foraging efficiency exhibiting higher fitness. Why some birds consistently can perform better at sea and breed earlier remains a question to investigate to understand how selection applies to these traits.
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Affiliation(s)
- Nicolas Joly
- Université de Strasbourg, CNRS, Institut Pluridisciplinaire Hubert Curien (IPHC), UMR 7178, Strasbourg, France
| | - Andre Chiaradia
- Conservation Department, Phillip Island Nature Parks, Cowes, Victoria, Australia
| | - Jean-Yves Georges
- Université de Strasbourg, CNRS, Institut Pluridisciplinaire Hubert Curien (IPHC), UMR 7178, Strasbourg, France
| | - Claire Saraux
- Université de Strasbourg, CNRS, Institut Pluridisciplinaire Hubert Curien (IPHC), UMR 7178, Strasbourg, France
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Abstract
We report a visible-light-induced iron-catalyzed α-alkylation of ketones. The photocatalytic system is based on the single diaminocyclopentadienone iron tricarbonyl complex. Two catalytic intermediates of this complex are able to harvest light, allowing the synthesis of substituted aromatic and aliphatic ketones at room temperature using the borrowing hydrogen strategy in the presence of various substituted primary alcohols as alkylating reagents. Preliminary mechanistic studies unveil the role of light for both the dehydrogenation and reduction step.
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Affiliation(s)
- Marie-Samira Abdallah
- Normandie Univ., LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000 Caen, France
| | - Nicolas Joly
- Normandie Univ., LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000 Caen, France.,Departament de Química, Institut de Química Computacional i Catàlisi (IQCC), University of Girona, c/Ma Aurèlia Capmany 69, 17003 Girona, Catalonia Spain
| | - Sylvain Gaillard
- Normandie Univ., LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000 Caen, France
| | - Albert Poater
- Departament de Química, Institut de Química Computacional i Catàlisi (IQCC), University of Girona, c/Ma Aurèlia Capmany 69, 17003 Girona, Catalonia Spain
| | - Jean-Luc Renaud
- Normandie Univ., LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000 Caen, France
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Gimferrer M, Joly N, Escayola S, Viñas E, Gaillard S, Solà M, Renaud JL, Salvador P, Poater A. Knölker Iron Catalysts for Hydrogenation Revisited: A Nonspectator Solvent and Fine-Tuning. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00099] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Martí Gimferrer
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, c/Ma̲ Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
| | - Nicolas Joly
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, c/Ma̲ Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
- Normandie Univ, LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000 Caen, France
| | - Sílvia Escayola
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, c/Ma̲ Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
- Donostia International Physics Center (DIPC), Manuel Lardizabal Ibilbidea 4, 20018 Donostia, Euskadi, Spain
| | - Eduard Viñas
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, c/Ma̲ Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
| | - Sylvain Gaillard
- Normandie Univ, LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000 Caen, France
| | - Miquel Solà
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, c/Ma̲ Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
| | - Jean-Luc Renaud
- Normandie Univ, LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000 Caen, France
| | - Pedro Salvador
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, c/Ma̲ Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
| | - Albert Poater
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, c/Ma̲ Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
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Velez-Aguilera G, Ossareh-Nazari B, Van Hove L, Joly N, Pintard L. Cortical microtubule pulling forces contribute to the union of the parental genomes in the C. elegans zygote. eLife 2022; 11:75382. [PMID: 35259092 PMCID: PMC8956289 DOI: 10.7554/elife.75382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 11/19/2021] [Accepted: 03/04/2022] [Indexed: 11/23/2022] Open
Abstract
Previously, we reported that the Polo-like kinase PLK-1 phosphorylates the single Caenorhabditis elegans lamin (LMN-1) to trigger lamina depolymerization during mitosis. We showed that this event is required to form a pronuclear envelope scission event that removes membranes on the juxtaposed oocyte and sperm pronuclear envelopes in the zygote, allowing the parental chromosomes to merge in a single nucleus after segregation (Velez-Aguilera et al., 2020). Here, we show that cortical microtubule pulling forces contribute to pronuclear envelopes scission by promoting mitotic spindle elongation, and conversely, nuclear envelopes remodeling facilitates spindle elongation. We also demonstrate that weakening the pronuclear envelopes via PLK-1-mediated lamina depolymerization, is a prerequisite for the astral microtubule pulling forces to trigger pronuclear membranes scission. Finally, we provide evidence that PLK-1 mainly acts via lamina depolymerization in this process. These observations thus indicate that temporal coordination between lamina depolymerization and mitotic spindle elongation facilitates pronuclear envelopes scission and parental genomes unification.
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Affiliation(s)
| | | | - Lucie Van Hove
- Cell Cycle and Development, Institut Jacques Monod, Paris, France
| | - Nicolas Joly
- Cell Cycle and Development, Institut Jacques Monod, Paris, France
| | - Lionel Pintard
- Cell Cycle and Development, Institut Jacques Monod, Paris, France
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Bettoni L, Joly N, Lohier J, Gaillard S, Poater A, Renaud J. Ruthenium‐Catalyzed Three‐Component Alkylation: A Tandem Approach to the Synthesis of Nonsymmetric
N,N‐
Dialkyl Acyl Hydrazides with Alcohols. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100554] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Léo Bettoni
- Normandie Univ. LCMT, ENSICAEN, UNICAEN, CNRS 6 boulevard du Maréchal Juin 14000 Caen France
| | - Nicolas Joly
- Normandie Univ. LCMT, ENSICAEN, UNICAEN, CNRS 6 boulevard du Maréchal Juin 14000 Caen France
- Departament de Química, Institut de Química Computacional i Catàlisi (IQCC) University of Girona c/ Mª Aurèlia Capmany 69 17003 Girona Catalonia Spain
| | - Jean‐François Lohier
- Normandie Univ. LCMT, ENSICAEN, UNICAEN, CNRS 6 boulevard du Maréchal Juin 14000 Caen France
| | - Sylvain Gaillard
- Normandie Univ. LCMT, ENSICAEN, UNICAEN, CNRS 6 boulevard du Maréchal Juin 14000 Caen France
| | - Albert Poater
- Departament de Química, Institut de Química Computacional i Catàlisi (IQCC) University of Girona c/ Mª Aurèlia Capmany 69 17003 Girona Catalonia Spain
| | - Jean‐Luc Renaud
- Normandie Univ. LCMT, ENSICAEN, UNICAEN, CNRS 6 boulevard du Maréchal Juin 14000 Caen France
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10
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Coufourier S, Ndiaye D, Gaillard QG, Bettoni L, Joly N, Mbaye MD, Poater A, Gaillard S, Renaud JL. Iron-catalyzed chemoselective hydride transfer reactions. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132187] [Citation(s) in RCA: 2] [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: 12/18/2022]
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11
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Joly N, Bettoni L, Gaillard S, Poater A, Renaud JL. Phosphine-Free Ruthenium Complex-Catalyzed Synthesis of Mono- or Dialkylated Acyl Hydrazides via the Borrowing Hydrogen Strategy. J Org Chem 2021; 86:6813-6825. [PMID: 33878271 DOI: 10.1021/acs.joc.1c00654] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Herein, we report a diaminocyclopentadienone ruthenium tricarbonyl complex-catalyzed synthesis of mono- or dialkylated acyl hydrazide compounds using the borrowing hydrogen strategy in the presence of various substituted primary and secondary alcohols as alkylating reagents. Deuterium labeling experiments confirm that the alcohols were the hydride source in this cascade process. Density functional theory (DFT) calculations unveil the origin and the threshold between the mono- and dialkylation.
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Affiliation(s)
- Nicolas Joly
- LCMT, ENSICAEN, UNICAEN, CNRS, Normandie Université, 6 boulevard du Maréchal Juin, 14000 Caen, France.,Departament de Química, Institut de Química Computacional i Catàlisi (IQCC), University of Girona, c/Maria Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
| | - Léo Bettoni
- LCMT, ENSICAEN, UNICAEN, CNRS, Normandie Université, 6 boulevard du Maréchal Juin, 14000 Caen, France
| | - Sylvain Gaillard
- LCMT, ENSICAEN, UNICAEN, CNRS, Normandie Université, 6 boulevard du Maréchal Juin, 14000 Caen, France
| | - Albert Poater
- Departament de Química, Institut de Química Computacional i Catàlisi (IQCC), University of Girona, c/Maria Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
| | - Jean-Luc Renaud
- LCMT, ENSICAEN, UNICAEN, CNRS, Normandie Université, 6 boulevard du Maréchal Juin, 14000 Caen, France
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12
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Chami S, Joly N, Bocchetta P, Martin P, Aliouche D. Polyacrylamide Grafted Xanthan: Microwave-Assisted Synthesis and Rheological Behavior for Polymer Flooding. Polymers (Basel) 2021; 13:polym13091484. [PMID: 34063011 PMCID: PMC8124169 DOI: 10.3390/polym13091484] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 03/28/2021] [Revised: 04/30/2021] [Accepted: 05/01/2021] [Indexed: 11/16/2022] Open
Abstract
Application of polymer-flooding systems in secondary and tertiary oil recovery represents a real challenge for oil industry. In this work, our main objective is to explore possibilities of making use of xanthan-g-polyacrylamide for polymer flooding in a particular Devonian oilfield of medium salinity. The graft polymer was synthesized by using microwave-assisted graft copolymerization reaction of acrylamide on xanthan. The synthesized copolymer with optimized grafting parameters has been characterized by Infrared Spectroscopy and Thermal Analysis (DSC). Rheological analysis by steady shear and oscillatory flow experiments have been subsequently performed for xanthan and grafted xanthan under reservoir conditions. In steady shear, as expected the grafted polymer solutions flow as shear-thinning materials and apparent viscosity showed good fits with Cross's model. The viscosity losses due to salinity or temperature are more controlled for the grafted xanthan compared to pristine xanthan. When the grafted polymer concentration is increased to 2000 ppm the losses were halved. In oscillatory shear, the copolymer solutions followed a global behavior of semi-dilute entangled systems; furthermore, all dynamic properties were influenced by the brine salinity. Compared to xanthan, the elastic properties of xanthan-g-polyacrylamide solutions have been significantly improved in saline media and the losses in elasticity of grafted polymer solutions are lower.
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Affiliation(s)
- Souheyla Chami
- Laboratory of Polymers Treatment & Forming, Faculty of Technology, M’Hamed Bougara University, Boumerdes 35000, Algeria; (S.C.); (D.A.)
| | - Nicolas Joly
- Univ Artois, UniLaSalle, Unité Transformations & Agroressources, ULR7519, F-62408 Béthune, France;
| | - Patrizia Bocchetta
- Department of Innovation Engineering, University of Salento, Via per Monteroni, 73100 Lecce, Italy;
| | - Patrick Martin
- Univ Artois, UniLaSalle, Unité Transformations & Agroressources, ULR7519, F-62408 Béthune, France;
- Correspondence:
| | - Djamel Aliouche
- Laboratory of Polymers Treatment & Forming, Faculty of Technology, M’Hamed Bougara University, Boumerdes 35000, Algeria; (S.C.); (D.A.)
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13
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Knox J, Joly N, Linossi EM, Carmona-Negrón JA, Jura N, Pintard L, Zuercher W, Roy PJ. A survey of the kinome pharmacopeia reveals multiple scaffolds and targets for the development of novel anthelmintics. Sci Rep 2021; 11:9161. [PMID: 33911106 PMCID: PMC8080662 DOI: 10.1038/s41598-021-88150-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 09/23/2020] [Accepted: 04/08/2021] [Indexed: 11/10/2022] Open
Abstract
Over one billion people are currently infected with a parasitic nematode. Symptoms can include anemia, malnutrition, developmental delay, and in severe cases, death. Resistance is emerging to the anthelmintics currently used to treat nematode infection, prompting the need to develop new anthelmintics. Towards this end, we identified a set of kinases that may be targeted in a nematode-selective manner. We first screened 2040 inhibitors of vertebrate kinases for those that impair the model nematode Caenorhabditis elegans. By determining whether the terminal phenotype induced by each kinase inhibitor matched that of the predicted target mutant in C. elegans, we identified 17 druggable nematode kinase targets. Of these, we found that nematode EGFR, MEK1, and PLK1 kinases have diverged from vertebrates within their drug-binding pocket. For each of these targets, we identified small molecule scaffolds that may be further modified to develop nematode-selective inhibitors. Nematode EGFR, MEK1, and PLK1 therefore represent key targets for the development of new anthelmintic medicines.
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Affiliation(s)
- Jessica Knox
- Department of Molecular Genetics, University of Toronto, Toronto, ON, M5S 1A8, Canada.,The Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, M5S 3E1, Canada
| | - Nicolas Joly
- Programme Équipe Labellisée Ligue Contre Le Cancer, Institut Jacques Monod, UMR7592, Université de Paris, CNRS, Paris, France
| | - Edmond M Linossi
- Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA, 94158, USA
| | - José A Carmona-Negrón
- Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA, 94158, USA
| | - Natalia Jura
- Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA, 94158, USA.,Department of Cellular and Molecular Pharmacology, University of California San Francisco, San Francisco, CA, 94158, USA
| | - Lionel Pintard
- Programme Équipe Labellisée Ligue Contre Le Cancer, Institut Jacques Monod, UMR7592, Université de Paris, CNRS, Paris, France
| | - William Zuercher
- School of Pharmacy, UNC Eshelman, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Peter J Roy
- Department of Molecular Genetics, University of Toronto, Toronto, ON, M5S 1A8, Canada. .,The Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, M5S 3E1, Canada. .,Department of Pharmacology and Toxicology, University of Toronto, Toronto, ON, M5S 1A8, Canada.
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14
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Tavernier N, Thomas Y, Vigneron S, Maisonneuve P, Orlicky S, Mader P, Regmi SG, Van Hove L, Levinson NM, Gasmi-Seabrook G, Joly N, Poteau M, Velez-Aguilera G, Gavet O, Castro A, Dasso M, Lorca T, Sicheri F, Pintard L. Bora phosphorylation substitutes in trans for T-loop phosphorylation in Aurora A to promote mitotic entry. Nat Commun 2021; 12:1899. [PMID: 33771996 PMCID: PMC7997955 DOI: 10.1038/s41467-021-21922-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [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: 07/16/2020] [Accepted: 02/19/2021] [Indexed: 12/16/2022] Open
Abstract
Polo-like kinase 1 (Plk1) is instrumental for mitotic entry and progression. Plk1 is activated by phosphorylation on a conserved residue Thr210 in its activation segment by the Aurora A kinase (AURKA), a reaction that critically requires the co-factor Bora phosphorylated by a CyclinA/B-Cdk1 kinase. Here we show that phospho-Bora is a direct activator of AURKA kinase activity. We localize the key determinants of phospho-Bora function to a 100 amino acid region encompassing two short Tpx2-like motifs and a phosphoSerine-Proline motif at Serine 112, through which Bora binds AURKA. The latter substitutes in trans for the Thr288 phospho-regulatory site of AURKA, which is essential for an active conformation of the kinase domain. We demonstrate the importance of these determinants for Bora function in mitotic entry both in Xenopus egg extracts and in human cells. Our findings unveil the activation mechanism of AURKA that is critical for mitotic entry.
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Affiliation(s)
- N Tavernier
- Centre for Systems Biology, Lunenfeld Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada
- Programme équipe Labellisée Ligue Contre le Cancer, Institut Jacques Monod, UMR7592, Université de Paris, CNRS, Paris, France
| | - Y Thomas
- Programme équipe Labellisée Ligue Contre le Cancer, Institut Jacques Monod, UMR7592, Université de Paris, CNRS, Paris, France
| | - S Vigneron
- Centre de Recherche de Biologie cellulaire de Montpellier, UMR 5237, Université de Montpellier, CNRS, Montpellier, France
| | - P Maisonneuve
- Centre for Systems Biology, Lunenfeld Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada
| | - S Orlicky
- Centre for Systems Biology, Lunenfeld Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada
| | - P Mader
- Centre for Systems Biology, Lunenfeld Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada
| | - S G Regmi
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA
| | - L Van Hove
- Programme équipe Labellisée Ligue Contre le Cancer, Institut Jacques Monod, UMR7592, Université de Paris, CNRS, Paris, France
| | - N M Levinson
- Department of Pharmacology, University of Minnesota, Minneapolis, MN, USA
| | - G Gasmi-Seabrook
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - N Joly
- Programme équipe Labellisée Ligue Contre le Cancer, Institut Jacques Monod, UMR7592, Université de Paris, CNRS, Paris, France
| | - M Poteau
- Institut Gustave Roussy CNRS UMR9019, Villejuif, France
| | - G Velez-Aguilera
- Programme équipe Labellisée Ligue Contre le Cancer, Institut Jacques Monod, UMR7592, Université de Paris, CNRS, Paris, France
| | - O Gavet
- Institut Gustave Roussy CNRS UMR9019, Villejuif, France
| | - A Castro
- Centre de Recherche de Biologie cellulaire de Montpellier, UMR 5237, Université de Montpellier, CNRS, Montpellier, France
| | - M Dasso
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA
| | - T Lorca
- Centre de Recherche de Biologie cellulaire de Montpellier, UMR 5237, Université de Montpellier, CNRS, Montpellier, France
| | - F Sicheri
- Centre for Systems Biology, Lunenfeld Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada.
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada.
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada.
| | - L Pintard
- Programme équipe Labellisée Ligue Contre le Cancer, Institut Jacques Monod, UMR7592, Université de Paris, CNRS, Paris, France.
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15
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Sacco P, Pedroso-Santana S, Kumar Y, Joly N, Martin P, Bocchetta P. Ionotropic Gelation of Chitosan Flat Structures and Potential Applications. Molecules 2021; 26:660. [PMID: 33513925 PMCID: PMC7865838 DOI: 10.3390/molecules26030660] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2021] [Revised: 01/20/2021] [Accepted: 01/20/2021] [Indexed: 12/22/2022] Open
Abstract
The capability of some polymers, such as chitosan, to form low cost gels under mild conditions is of great application interest. Ionotropic gelation of chitosan has been used predominantly for the preparation of gel beads for biomedical application. Only in the last few years has the use of this method been extended to the fabrication of chitosan-based flat structures. Herein, after an initial analysis of the major applications of chitosan flat membranes and films and their usual methods of synthesis, the process of ionotropic gelation of chitosan and some recently proposed novel procedures for the synthesis of flat structures are presented.
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Affiliation(s)
- Pasquale Sacco
- Department of Life Sciences, University of Trieste, Via Licio Giorgieri 5, I-34127 Trieste, Italy;
| | - Seidy Pedroso-Santana
- Pathophysiology Department, School of Biological Sciences, Universidad de Concepción, 4030000 Concepción, Chile;
| | - Yogesh Kumar
- Department of Physics, ARSD College, University of Delhi, Delhi 110021, India;
| | - Nicolas Joly
- Unité Transformations & Agroressources, Université d’Artois—UniLasalle, ULR7519, F-62408 Béthune, France; (N.J.); (P.M.)
| | - Patrick Martin
- Unité Transformations & Agroressources, Université d’Artois—UniLasalle, ULR7519, F-62408 Béthune, France; (N.J.); (P.M.)
| | - Patrizia Bocchetta
- Dipartimento di Ingegneria dell’Innovazione, Università del Salento, Via Monteroni, 73100 Lecce, Italy
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16
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Platel R, Chaveriat L, Le Guenic S, Pipeleers R, Magnin-Robert M, Randoux B, Trapet P, Lequart V, Joly N, Halama P, Martin P, Höfte M, Reignault P, Siah A. Importance of the C 12 Carbon Chain in the Biological Activity of Rhamnolipids Conferring Protection in Wheat against Zymoseptoria tritici. Molecules 2020; 26:molecules26010040. [PMID: 33374771 PMCID: PMC7796335 DOI: 10.3390/molecules26010040] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 12/17/2020] [Accepted: 12/19/2020] [Indexed: 11/20/2022] Open
Abstract
The hemibiotrophic fungus Zymoseptoria tritici, responsible for Septoria tritici blotch, is currently the most devastating foliar disease on wheat crops worldwide. Here, we explored, for the first time, the ability of rhamnolipids (RLs) to control this pathogen, using a total of 19 RLs, including a natural RL mixture produced by Pseudomonas aeruginosa and 18 bioinspired RLs synthesized using green chemistry, as well as two related compounds (lauric acid and dodecanol). These compounds were assessed for in vitro antifungal effect, in planta defence elicitation (peroxidase and catalase enzyme activities), and protection efficacy on the wheat-Z. tritici pathosystem. Interestingly, a structure-activity relationship analysis revealed that synthetic RLs with a 12 carbon fatty acid tail were the most effective for all examined biological activities. This highlights the importance of the C12 chain in the bioactivity of RLs, likely by acting on the plasma membranes of both wheat and Z. tritici cells. The efficacy of the most active compound Rh-Est-C12 was 20-fold lower in planta than in vitro; an optimization of the formulation is thus required to increase its effectiveness. No Z. tritici strain-dependent activity was scored for Rh-Est-C12 that exhibited similar antifungal activity levels towards strains differing in their resistance patterns to demethylation inhibitor fungicides, including multi-drug resistance strains. This study reports new insights into the use of bio-inspired RLs to control Z. tritici.
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Affiliation(s)
- Rémi Platel
- Joint Research Unit N° 1158 BioEcoAgro, Junia, University Lille, INRAE, University Liège, UPJV, University Artois, ULCO, 48, Boulevard Vauban, BP 41290, F-59014 Lille CEDEX, France; (R.P.); (P.T.); (P.H.)
| | - Ludovic Chaveriat
- ULR 7519—Unité Transformations & Agroressources, University Artois, UniLasalle, F-62408 Béthune, France; (L.C.); (S.L.G.); (V.L.); (N.J.); (P.M.)
| | - Sarah Le Guenic
- ULR 7519—Unité Transformations & Agroressources, University Artois, UniLasalle, F-62408 Béthune, France; (L.C.); (S.L.G.); (V.L.); (N.J.); (P.M.)
| | - Rutger Pipeleers
- Lab. Phytopathology, Department Plants & Crops, Ghent University, B-9000 Ghent, Belgium; (R.P.); (M.H.)
| | - Maryline Magnin-Robert
- Unité de Chimie Environnementale et Interactions sur le Vivant (EA 4492), Université du Littoral Côte d’Opale, CS 80699, F-62228 Calais CEDEX, France; (M.M.-R.); (B.R.); (P.R.)
| | - Béatrice Randoux
- Unité de Chimie Environnementale et Interactions sur le Vivant (EA 4492), Université du Littoral Côte d’Opale, CS 80699, F-62228 Calais CEDEX, France; (M.M.-R.); (B.R.); (P.R.)
| | - Pauline Trapet
- Joint Research Unit N° 1158 BioEcoAgro, Junia, University Lille, INRAE, University Liège, UPJV, University Artois, ULCO, 48, Boulevard Vauban, BP 41290, F-59014 Lille CEDEX, France; (R.P.); (P.T.); (P.H.)
| | - Vincent Lequart
- ULR 7519—Unité Transformations & Agroressources, University Artois, UniLasalle, F-62408 Béthune, France; (L.C.); (S.L.G.); (V.L.); (N.J.); (P.M.)
| | - Nicolas Joly
- ULR 7519—Unité Transformations & Agroressources, University Artois, UniLasalle, F-62408 Béthune, France; (L.C.); (S.L.G.); (V.L.); (N.J.); (P.M.)
| | - Patrice Halama
- Joint Research Unit N° 1158 BioEcoAgro, Junia, University Lille, INRAE, University Liège, UPJV, University Artois, ULCO, 48, Boulevard Vauban, BP 41290, F-59014 Lille CEDEX, France; (R.P.); (P.T.); (P.H.)
| | - Patrick Martin
- ULR 7519—Unité Transformations & Agroressources, University Artois, UniLasalle, F-62408 Béthune, France; (L.C.); (S.L.G.); (V.L.); (N.J.); (P.M.)
| | - Monica Höfte
- Lab. Phytopathology, Department Plants & Crops, Ghent University, B-9000 Ghent, Belgium; (R.P.); (M.H.)
| | - Philippe Reignault
- Unité de Chimie Environnementale et Interactions sur le Vivant (EA 4492), Université du Littoral Côte d’Opale, CS 80699, F-62228 Calais CEDEX, France; (M.M.-R.); (B.R.); (P.R.)
| | - Ali Siah
- Joint Research Unit N° 1158 BioEcoAgro, Junia, University Lille, INRAE, University Liège, UPJV, University Artois, ULCO, 48, Boulevard Vauban, BP 41290, F-59014 Lille CEDEX, France; (R.P.); (P.T.); (P.H.)
- Correspondence: ; Tel.: +33-(0)3-28-38-48-48
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17
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Jarlier F, Joly N, Fedy N, Magalhaes T, Sirotti L, Paganiban P, Martin F, McManus M, Hupé P. QUARTIC: QUick pArallel algoRithms for high-Throughput sequencIng data proCessing. F1000Res 2020; 9:240. [PMID: 32913637 PMCID: PMC7429925 DOI: 10.12688/f1000research.22954.3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/05/2020] [Indexed: 11/20/2022] Open
Abstract
Life science has entered the so-called 'big data era' where biologists, clinicians and bioinformaticians are overwhelmed with high-throughput sequencing data. While they offer new insights to decipher the genome structure they also raise major challenges to use them for daily clinical practice care and diagnosis purposes as they are bigger and bigger. Therefore, we implemented a software to reduce the time to delivery for the alignment and the sorting of high-throughput sequencing data. Our solution is implemented using Message Passing Interface and is intended for high-performance computing architecture. The software scales linearly with respect to the size of the data and ensures a total reproducibility with the traditional tools. For example, a 300X whole genome can be aligned and sorted within less than 9 hours with 128 cores. The software offers significant speed-up using multi-cores and multi-nodes parallelization.
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Affiliation(s)
- Frédéric Jarlier
- Institut Curie, Paris, F-75005, France.,U900, Inserm, Paris, F-75005, France.,PSL Research University, Paris, France.,Mines Paris Tech, Fontainebleau, F-77305, France
| | | | - Nicolas Fedy
- Institut Curie, Paris, F-75005, France.,U900, Inserm, Paris, F-75005, France.,PSL Research University, Paris, France.,Mines Paris Tech, Fontainebleau, F-77305, France.,Université Paris Descartes, Paris, F-75006, France
| | - Thomas Magalhaes
- Institut Curie, Paris, F-75005, France.,U900, Inserm, Paris, F-75005, France.,PSL Research University, Paris, France.,Mines Paris Tech, Fontainebleau, F-77305, France.,Université Paris Descartes, Paris, F-75006, France
| | - Leonor Sirotti
- Institut Curie, Paris, F-75005, France.,U900, Inserm, Paris, F-75005, France.,PSL Research University, Paris, France.,Mines Paris Tech, Fontainebleau, F-77305, France.,Université Paris Descartes, Paris, F-75006, France
| | - Paul Paganiban
- Institut Curie, Paris, F-75005, France.,U900, Inserm, Paris, F-75005, France.,PSL Research University, Paris, France.,Mines Paris Tech, Fontainebleau, F-77305, France.,Université Paris Descartes, Paris, F-75006, France
| | - Firmin Martin
- Institut Curie, Paris, F-75005, France.,U900, Inserm, Paris, F-75005, France.,PSL Research University, Paris, France.,Mines Paris Tech, Fontainebleau, F-77305, France.,Université Paris Descartes, Paris, F-75006, France
| | | | - Philippe Hupé
- Institut Curie, Paris, F-75005, France.,U900, Inserm, Paris, F-75005, France.,PSL Research University, Paris, France.,Mines Paris Tech, Fontainebleau, F-77305, France.,UMR144, CNRS, Paris, F-75005, France
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18
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Velez-Aguilera G, Nkombo Nkoula S, Ossareh-Nazari B, Link J, Paouneskou D, Van Hove L, Joly N, Tavernier N, Verbavatz JM, Jantsch V, Pintard L. PLK-1 promotes the merger of the parental genome into a single nucleus by triggering lamina disassembly. eLife 2020; 9:59510. [PMID: 33030429 PMCID: PMC7544505 DOI: 10.7554/elife.59510] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 09/17/2020] [Indexed: 12/15/2022] Open
Abstract
Life of sexually reproducing organisms starts with the fusion of the haploid egg and sperm gametes to form the genome of a new diploid organism. Using the newly fertilized Caenorhabditis elegans zygote, we show that the mitotic Polo-like kinase PLK-1 phosphorylates the lamin LMN-1 to promote timely lamina disassembly and subsequent merging of the parental genomes into a single nucleus after mitosis. Expression of non-phosphorylatable versions of LMN-1, which affect lamina depolymerization during mitosis, is sufficient to prevent the mixing of the parental chromosomes into a single nucleus in daughter cells. Finally, we recapitulate lamina depolymerization by PLK-1 in vitro demonstrating that LMN-1 is a direct PLK-1 target. Our findings indicate that the timely removal of lamin is essential for the merging of parental chromosomes at the beginning of life in C. elegans and possibly also in humans, where a defect in this process might be fatal for embryo development.
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Affiliation(s)
- Griselda Velez-Aguilera
- Programme Equipe Labéllisée Ligue Contre le Cancer - Team Cell Cycle & Development - Université de Paris, CNRS, Institut Jacques Monod, Paris, France
| | - Sylvia Nkombo Nkoula
- Programme Equipe Labéllisée Ligue Contre le Cancer - Team Cell Cycle & Development - Université de Paris, CNRS, Institut Jacques Monod, Paris, France
| | - Batool Ossareh-Nazari
- Programme Equipe Labéllisée Ligue Contre le Cancer - Team Cell Cycle & Development - Université de Paris, CNRS, Institut Jacques Monod, Paris, France
| | - Jana Link
- Department of Chromosome Biology, Max Perutz Laboratories, University of Vienna, Vienna Biocenter, Vienna, Austria
| | - Dimitra Paouneskou
- Department of Chromosome Biology, Max Perutz Laboratories, University of Vienna, Vienna Biocenter, Vienna, Austria
| | - Lucie Van Hove
- Programme Equipe Labéllisée Ligue Contre le Cancer - Team Cell Cycle & Development - Université de Paris, CNRS, Institut Jacques Monod, Paris, France
| | - Nicolas Joly
- Programme Equipe Labéllisée Ligue Contre le Cancer - Team Cell Cycle & Development - Université de Paris, CNRS, Institut Jacques Monod, Paris, France
| | - Nicolas Tavernier
- Programme Equipe Labéllisée Ligue Contre le Cancer - Team Cell Cycle & Development - Université de Paris, CNRS, Institut Jacques Monod, Paris, France
| | | | - Verena Jantsch
- Department of Chromosome Biology, Max Perutz Laboratories, University of Vienna, Vienna Biocenter, Vienna, Austria
| | - Lionel Pintard
- Programme Equipe Labéllisée Ligue Contre le Cancer - Team Cell Cycle & Development - Université de Paris, CNRS, Institut Jacques Monod, Paris, France
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19
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Robineau M, Le Guenic S, Sanchez L, Chaveriat L, Lequart V, Joly N, Calonne M, Jacquard C, Declerck S, Martin P, Dorey S, Ait Barka E. Synthetic Mono-Rhamnolipids Display Direct Antifungal Effects and Trigger an Innate Immune Response in Tomato against Botrytis Cinerea. Molecules 2020; 25:molecules25143108. [PMID: 32650401 PMCID: PMC7397090 DOI: 10.3390/molecules25143108] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 06/29/2020] [Accepted: 07/03/2020] [Indexed: 11/16/2022] Open
Abstract
Natural rhamnolipids are potential biocontrol agents for plant protection against bacterial and fungal diseases. In this work, we synthetized new synthetic mono-rhamnolipids (smRLs) consisting in a rhamnose connected to a simple acyl chain and differing by the nature of the link and the length of the lipid tail. We then investigated the effects of these ether, ester, carbamate or succinate smRL derivatives on Botrytis cinerea development, symptoms spreading on tomato leaves and immune responses in tomato plants. Our results demonstrate that synthetic smRLs are able to trigger early and late immunity-related plant defense responses in tomato and increase plant resistance against B. cinerea in controlled conditions. Structure-function analysis showed that chain length of the lipidic part and type of acyl chain were critical to smRLs immune activity and to the extent of symptoms caused by the fungus on tomato leaves.
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Affiliation(s)
- Mathilde Robineau
- RIBP-EA 4707, SFR Condorcet FR CNRS 3417, University of Reims Champagne-Ardenne, 51100 Reims, France
| | - Sarah Le Guenic
- UnilaSalle, Unité Transformations & Agroressources, Université d'Artois, ULR7519, F-62408 Béthune, France
| | - Lisa Sanchez
- RIBP-EA 4707, SFR Condorcet FR CNRS 3417, University of Reims Champagne-Ardenne, 51100 Reims, France
| | - Ludovic Chaveriat
- UnilaSalle, Unité Transformations & Agroressources, Université d'Artois, ULR7519, F-62408 Béthune, France
| | - Vincent Lequart
- UnilaSalle, Unité Transformations & Agroressources, Université d'Artois, ULR7519, F-62408 Béthune, France
| | - Nicolas Joly
- UnilaSalle, Unité Transformations & Agroressources, Université d'Artois, ULR7519, F-62408 Béthune, France
| | - Maryline Calonne
- Earth and Life Institute, Applied Microbiology, Mycology, Université catholique de Louvain, Croix du Sud, 2 box L7.05.06, 1348 Louvain-la-Neuve, Belgium
| | - Cédric Jacquard
- RIBP-EA 4707, SFR Condorcet FR CNRS 3417, University of Reims Champagne-Ardenne, 51100 Reims, France
| | - Stéphane Declerck
- Earth and Life Institute, Applied Microbiology, Mycology, Université catholique de Louvain, Croix du Sud, 2 box L7.05.06, 1348 Louvain-la-Neuve, Belgium
| | - Patrick Martin
- UnilaSalle, Unité Transformations & Agroressources, Université d'Artois, ULR7519, F-62408 Béthune, France
| | - Stephan Dorey
- RIBP-EA 4707, SFR Condorcet FR CNRS 3417, University of Reims Champagne-Ardenne, 51100 Reims, France
| | - Essaid Ait Barka
- RIBP-EA 4707, SFR Condorcet FR CNRS 3417, University of Reims Champagne-Ardenne, 51100 Reims, France
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20
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Joly N, Beaumale E, Van Hove L, Martino L, Pintard L. Phosphorylation of the microtubule-severing AAA+ enzyme Katanin regulates C. elegans embryo development. J Cell Biol 2020; 219:e201912037. [PMID: 32412594 PMCID: PMC7265321 DOI: 10.1083/jcb.201912037] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 12/05/2019] [Revised: 02/25/2020] [Accepted: 03/03/2020] [Indexed: 12/15/2022] Open
Abstract
The evolutionarily conserved microtubule (MT)-severing AAA-ATPase enzyme Katanin is emerging as a critical regulator of MT dynamics. In Caenorhabditis elegans, Katanin MT-severing activity is essential for meiotic spindle assembly but is toxic for the mitotic spindle. Here we analyzed Katanin dynamics in C. elegans and deciphered the role of Katanin phosphorylation in the regulation of its activity and stability. Katanin is abundant in oocytes, and its levels drop after meiosis, but unexpectedly, a significant fraction is present throughout embryogenesis, where it is dynamically recruited to the centrosomes and chromosomes during mitosis. We show that the minibrain kinase MBK-2, which is activated during meiosis, phosphorylates Katanin at multiple serines. We demonstrate unequivocally that Katanin phosphorylation at a single residue is necessary and sufficient to target Katanin for proteasomal degradation after meiosis, whereas phosphorylation at the other sites only inhibits Katanin ATPase activity stimulated by MTs. Our findings suggest that cycles of phosphorylation and dephosphorylation fine-tune Katanin level and activity to deliver the appropriate MT-severing activity during development.
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Affiliation(s)
- Nicolas Joly
- Programme Equipes Labellisées Ligue contre le Cancer – Team “Cell Cycle and Development,” Centre National de la Recherche Scientifique – UMR7592, Institut Jacques Monod/University of Paris, Paris, France
| | | | | | | | - Lionel Pintard
- Programme Equipes Labellisées Ligue contre le Cancer – Team “Cell Cycle and Development,” Centre National de la Recherche Scientifique – UMR7592, Institut Jacques Monod/University of Paris, Paris, France
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21
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Duchatel-Crépy L, Joly N, Martin P, Marin A, Tahon JF, Lefebvre JM, Gaucher V. Substitution degree and fatty chain length influence on structure and properties of fatty acid cellulose esters. Carbohydr Polym 2020; 234:115912. [DOI: 10.1016/j.carbpol.2020.115912] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 01/23/2020] [Accepted: 01/23/2020] [Indexed: 10/25/2022]
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22
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Joly N, Honzík P. Numerical Modelling of Boundary Layers and Far Field Acoustic Propagation in Thermoviscous Fluid. ACTA ACUST UNITED AC 2019. [DOI: 10.3813/aaa.919392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
To model linear acoustics in a thermoviscous fluid in open domain and time-harmonic regime, a Finite Element formulation in a bounded meshed domain is combined with the integral representation of the field for the propagative solution. The integrals are non-singular and involve the
only Finite Element node values for temperature variation and particle velocity variables. To overcome the non-uniqueness of solutions at fictitious resonant frequencies, a Burton-Miller combination of integral representation is used. This formulation is suitable to compute acoustic radiation,
scattering and diffraction by objects or mutual interaction between transducers. Two-dimensional computational experiments are presented in an infinite, open domain (exterior), showing that the model can be achieved in meshing only a thin domain surrounding the physical boundaries of a device.
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23
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Sango T, Stoclet G, Joly N, Marin A, Cheumani Yona AM, Duchatel L, Kor Ndikontar M, Lefebvre J. Water–soluble extracts from banana pseudo–stem as functional additives for polylactic acid: Thermal and mechanical investigations. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.01.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Affiliation(s)
- Sarah Le Guenic
- Université d'Artois, UniLasalle, EA7519 - Unité Transformations & Agroressources, F-62408; Béthune
| | - Ludovic Chaveriat
- Université d'Artois, UniLasalle, EA7519 - Unité Transformations & Agroressources, F-62408; Béthune
| | - Vincent Lequart
- Université d'Artois, UniLasalle, EA7519 - Unité Transformations & Agroressources, F-62408; Béthune
| | - Nicolas Joly
- Université d'Artois, UniLasalle, EA7519 - Unité Transformations & Agroressources, F-62408; Béthune
| | - Patrick Martin
- Université d'Artois, UniLasalle, EA7519 - Unité Transformations & Agroressources, F-62408; Béthune
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Lombardini A, Mytskaniuk V, Sivankutty S, Andresen ER, Chen X, Wenger J, Fabert M, Joly N, Louradour F, Kudlinski A, Rigneault H. High-resolution multimodal flexible coherent Raman endoscope. Light Sci Appl 2018; 7:10. [PMID: 30839624 PMCID: PMC6107025 DOI: 10.1038/s41377-018-0003-3] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 02/12/2018] [Accepted: 02/12/2018] [Indexed: 05/21/2023]
Abstract
Coherent Raman scattering microscopy is a fast, label-free, and chemically specific imaging technique that shows high potential for future in vivo optical histology. However, the imaging depth in tissues is limited to the sub-millimeter range because of absorption and scattering. Realization of coherent Raman imaging using a fiber endoscope system is a crucial step towards imaging deep inside living tissues and providing information that is inaccessible with current microscopy tools. Until now, the development of coherent Raman endoscopy has been hampered by several issues, mainly related to the fiber delivery of the excitation pulses and signal collection. Here, we present a flexible, compact, coherent Raman, and multimodal nonlinear endoscope (4.2 mm outer diameter, 71 mm rigid length) based on a resonantly scanned hollow-core Kagomé-lattice double-clad fiber. The fiber design enables distortion-less, background-free delivery of femtosecond excitation pulses and back-collection of nonlinear signals through the same fiber. Sub-micrometer spatial resolution over a large field of view is obtained by combination of a miniature objective lens with a silica microsphere lens inserted into the fiber core. We demonstrate high-resolution, high-contrast coherent anti-Stokes Raman scattering, and second harmonic generation endoscopic imaging of biological tissues over a field of view of 320 µm at a rate of 0.8 frames per second. These results pave the way for intraoperative label-free imaging applied to real-time histopathology diagnosis and surgery guidance.
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Affiliation(s)
- Alberto Lombardini
- Aix-Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Vasyl Mytskaniuk
- Aix-Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Siddharth Sivankutty
- Aix-Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Esben Ravn Andresen
- Aix-Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
- Laboratoire de Physique des Lasers Atomes et Molécules, UMR 8523, CNRS, Université Lille, 59000 Lille, France
| | - Xueqin Chen
- Aix-Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Jérôme Wenger
- Aix-Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Marc Fabert
- CNRS, XLIM, UMR 7252, Université de Limoges, 87060 Limoges, France
| | - Nicolas Joly
- Department of Physics, Max Planck Institute for the Science of Light, University of Erlangen Nuremberg, 91058 Erlangen, Germany
| | | | - Alexandre Kudlinski
- Laboratoire de Physique des Lasers Atomes et Molécules, UMR 8523, CNRS, Université Lille, 59000 Lille, France
| | - Hervé Rigneault
- Aix-Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
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Martino L, Morchoisne-Bolhy S, Cheerambathur DK, Van Hove L, Dumont J, Joly N, Desai A, Doye V, Pintard L. Channel Nucleoporins Recruit PLK-1 to Nuclear Pore Complexes to Direct Nuclear Envelope Breakdown in C. elegans. Dev Cell 2017; 43:157-171.e7. [PMID: 29065307 PMCID: PMC8184135 DOI: 10.1016/j.devcel.2017.09.019] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [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: 12/16/2016] [Revised: 08/02/2017] [Accepted: 09/22/2017] [Indexed: 01/24/2023]
Abstract
In animal cells, nuclear envelope breakdown (NEBD) is required for proper chromosome segregation. Whereas mitotic kinases have been implicated in NEBD, how they coordinate their activity to trigger this event is unclear. Here, we show that both in human cells and Caenorhabditis elegans, the Polo-like kinase 1 (PLK-1) is recruited to the nuclear pore complexes, just prior to NEBD, through its Polo-box domain (PBD). We provide evidence that PLK-1 localization to the nuclear envelope (NE) is required for efficient NEBD. We identify the central channel nucleoporins NPP-1/Nup58, NPP-4/Nup54, and NPP-11/Nup62 as the critical factors anchoring PLK-1 to the NE in C. elegans. In particular, NPP-1, NPP-4, and NPP-11 primed at multiple Polo-docking sites by Cdk1 and PLK-1 itself physically interact with the PLK-1 PBD. We conclude that nucleoporins play an unanticipated regulatory role in NEBD, by recruiting PLK-1 to the NE thereby facilitating phosphorylation of critical downstream targets.
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Affiliation(s)
- Lisa Martino
- Cell Cycle and Development, Institut Jacques Monod, UMR7592 CNRS - Université Paris Diderot, Sorbonne Paris Cité, Paris, France
| | - Stéphanie Morchoisne-Bolhy
- Non-conventional Functions of Nuclear Pore, Institut Jacques Monod, UMR7592 CNRS - Université Paris Diderot, Sorbonne Paris Cité, Paris, France
| | - Dhanya K Cheerambathur
- Ludwig Institute for Cancer Research, Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Lucie Van Hove
- Cell Cycle and Development, Institut Jacques Monod, UMR7592 CNRS - Université Paris Diderot, Sorbonne Paris Cité, Paris, France
| | - Julien Dumont
- Cell Division and Reproduction, Institut Jacques Monod, UMR7592 CNRS - Université Paris Diderot, Sorbonne Paris Cité, Paris, France
| | - Nicolas Joly
- Cell Cycle and Development, Institut Jacques Monod, UMR7592 CNRS - Université Paris Diderot, Sorbonne Paris Cité, Paris, France
| | - Arshad Desai
- Ludwig Institute for Cancer Research, Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Valérie Doye
- Non-conventional Functions of Nuclear Pore, Institut Jacques Monod, UMR7592 CNRS - Université Paris Diderot, Sorbonne Paris Cité, Paris, France
| | - Lionel Pintard
- Cell Cycle and Development, Institut Jacques Monod, UMR7592 CNRS - Université Paris Diderot, Sorbonne Paris Cité, Paris, France.
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Richarme G, Liu C, Mihoub M, Abdallah J, Leger T, Joly N, Liebart JC, Jurkunas UV, Nadal M, Bouloc P, Dairou J, Lamouri A. Guanine glycation repair by DJ-1/Park7 and its bacterial homologs. Science 2017; 357:208-211. [DOI: 10.1126/science.aag1095] [Citation(s) in RCA: 122] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 05/17/2017] [Indexed: 01/05/2023]
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28
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Vanmarcke A, Leroy L, Stoclet G, Duchatel-Crépy L, Lefebvre JM, Joly N, Gaucher V. Influence of fatty chain length and starch composition on structure and properties of fully substituted fatty acid starch esters. Carbohydr Polym 2017; 164:249-257. [PMID: 28325324 DOI: 10.1016/j.carbpol.2017.02.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [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: 11/28/2016] [Revised: 02/01/2017] [Accepted: 02/03/2017] [Indexed: 11/26/2022]
Abstract
A series of almost fully substituted Fatty Acid Starch Esters (FASEs) has been obtained in a homogeneous LiCl/DMAc medium by grafting octanoyl (C8), lauroyl (C12) and palmitoyl (C16) chlorides onto 3 starch species: Amylo-Maize, Potato and Waxy Maize. Structure-property relationships of FASEs are investigated as a function of both fatty acid chain length and amylose/amylopectin ratio of the starch. The structural study has revealed a layered type organization in which starch chain planes are separated by fatty chains. The latter are interpenetrated and/or tilted for FASE-C16 whatever the origin of the starch is, and fatty chains partially crystallizes into a structure with hexagonal symmetry. FASEs with C8 and C12 side chains are totally amorphous. The mechanical behavior of FASEs is shown to depend on both side chain length and amylose/amylopectin ratio, and an increase in material ductility is observed at increasing amylose content for C8 and C12 side chains.
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Affiliation(s)
- Audrey Vanmarcke
- Univ Lille Nord France, 59000 Lille, France; Unité Matériaux Et Transformations, UMR CNRS 8207, Université Lille 1, France
| | - Lise Leroy
- Univ Lille Nord France, 59000 Lille, France; Unité Matériaux Et Transformations, UMR CNRS 8207, Université Lille 1, France
| | - Gregory Stoclet
- Univ Lille Nord France, 59000 Lille, France; Unité Matériaux Et Transformations, UMR CNRS 8207, Université Lille 1, France
| | - Lucie Duchatel-Crépy
- Univ Lille Nord France, 59000 Lille, France; UArtois, IUT Béthune, 62408 Béthune, France; IUT de Béthune, 1230 rue de l'Université, CS 20819, 62408 Béthune, France
| | - Jean-Marc Lefebvre
- Univ Lille Nord France, 59000 Lille, France; Unité Matériaux Et Transformations, UMR CNRS 8207, Université Lille 1, France
| | - Nicolas Joly
- Univ Lille Nord France, 59000 Lille, France; UArtois, IUT Béthune, 62408 Béthune, France; IUT de Béthune, 1230 rue de l'Université, CS 20819, 62408 Béthune, France.
| | - Valérie Gaucher
- Univ Lille Nord France, 59000 Lille, France; Unité Matériaux Et Transformations, UMR CNRS 8207, Université Lille 1, France.
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Le Guern F, Ouk TS, Grenier K, Joly N, Lequart V, Sol V. Enhancement of photobactericidal activity of chlorin-e6-cellulose nanocrystals by covalent attachment of polymyxin B. J Mater Chem B 2017; 5:6953-6962. [DOI: 10.1039/c7tb01274h] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Following light irradiation, a new nanomaterial, elaborated from CNCs, chlorin-e6 and polymyxin B, demonstrated efficiency against Gram-negative bacteria (Escherichia coli,Pseudomonas aeruginosa) and Gram-positive bacteria (Staphylococcus aureus,Staphylococcus epidermidis).
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Affiliation(s)
- Florent Le Guern
- Université de Limoges
- Laboratoire de Chimie des Substances Naturelles
- 87060 Limoges Cedex
- France
| | - Tan-Sothea Ouk
- Université de Limoges
- Laboratoire de Chimie des Substances Naturelles
- 87060 Limoges Cedex
- France
| | - Karine Grenier
- Université de Limoges
- Laboratoire de Chimie des Substances Naturelles
- 87060 Limoges Cedex
- France
| | | | | | - Vincent Sol
- Université de Limoges
- Laboratoire de Chimie des Substances Naturelles
- 87060 Limoges Cedex
- France
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Joly N, Martino L, Gigant E, Dumont J, Pintard L. Microtubule-severing activity of AAA+ ATPase Katanin is essential for female meiotic spindle assembly. J Cell Sci 2016. [DOI: 10.1242/jcs.198002] [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: 11/20/2022] Open
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Joly N, Martino L, Gigant E, Dumont J, Pintard L. Microtubule-severing activity of the AAA+ ATPase Katanin is essential for female meiotic spindle assembly. Development 2016; 143:3604-3614. [PMID: 27578779 DOI: 10.1242/dev.140830] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [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: 06/08/2016] [Accepted: 08/12/2016] [Indexed: 02/03/2023]
Abstract
In most animals, female meiotic spindles are assembled in the absence of centrosomes. How microtubules (MTs) are organized into acentrosomal meiotic spindles is poorly understood. In Caenorhabditis elegans, assembly of female meiotic spindles requires MEI-1 and MEI-2, which constitute the microtubule-severing AAA+ ATPase Katanin. However, the role of MEI-2 is not known and whether MT severing is required for meiotic spindle assembly is unclear. Here, we show that the essential role of MEI-2 is to confer MT binding to Katanin, which in turn stimulates the ATPase activity of MEI-1, leading to MT severing. To test directly the contribution of MT severing to meiotic spindle assembly, we engineered Katanin variants that retained MT binding and MT bundling activities but that were inactive for MT severing. In vivo analysis of these variants showed disorganized microtubules that lacked focused spindle poles reminiscent of the Katanin loss-of-function phenotype, demonstrating that the MT-severing activity is essential for meiotic spindle assembly in C. elegans Overall, our results reveal the essential role of MEI-2 and provide the first direct evidence supporting an essential role of MT severing in meiotic spindle assembly in C. elegans.
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Affiliation(s)
- Nicolas Joly
- Institut Jacques Monod, Cell Cycle and Development Team, Centre National de la Recherche Scientifique and University of Paris Diderot and Sorbonne Paris Cité UMR7592, Paris 75013, France
| | - Lisa Martino
- Institut Jacques Monod, Cell Cycle and Development Team, Centre National de la Recherche Scientifique and University of Paris Diderot and Sorbonne Paris Cité UMR7592, Paris 75013, France
| | - Emmanuelle Gigant
- Institut Jacques Monod, Cell Division and Reproduction Team, Centre National de la Recherche Scientifique and University of Paris Diderot and Sorbonne Paris Cité UMR7592, Paris 75013, France
| | - Julien Dumont
- Institut Jacques Monod, Cell Division and Reproduction Team, Centre National de la Recherche Scientifique and University of Paris Diderot and Sorbonne Paris Cité UMR7592, Paris 75013, France
| | - Lionel Pintard
- Institut Jacques Monod, Cell Cycle and Development Team, Centre National de la Recherche Scientifique and University of Paris Diderot and Sorbonne Paris Cité UMR7592, Paris 75013, France
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Thomas Y, Cirillo L, Panbianco C, Martino L, Tavernier N, Schwager F, Van Hove L, Joly N, Santamaria A, Pintard L, Gotta M. Cdk1 Phosphorylates SPAT-1/Bora to Promote Plk1 Activation in C. elegans and Human Cells. Cell Rep 2016; 15:510-518. [PMID: 27068477 DOI: 10.1016/j.celrep.2016.03.049] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [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: 12/02/2015] [Revised: 02/19/2016] [Accepted: 03/12/2016] [Indexed: 11/28/2022] Open
Abstract
The conserved Bora protein is a Plk1 activator, essential for checkpoint recovery after DNA damage in human cells. Here, we show that Bora interacts with Cyclin B and is phosphorylated by Cyclin B/Cdk1 at several sites. The first 225 amino acids of Bora, which contain two Cyclin binding sites and three conserved phosphorylated residues, are sufficient to promote Plk1 phosphorylation by Aurora A in vitro. Mutating the Cyclin binding sites or the three conserved phosphorylation sites abrogates the ability of the N terminus of Bora to promote Plk1 activation. In human cells, Bora-carrying mutations of the three conserved phosphorylation sites cannot sustain mitotic entry after DNA damage. In C. elegans embryos, mutation of the three conserved phosphorylation sites in SPAT-1, the Bora ortholog, results in a severe mitotic entry delay. Our results reveal a crucial and conserved role of phosphorylation of the N terminus of Bora for Plk1 activation and mitotic entry.
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Affiliation(s)
- Yann Thomas
- Jacques Monod Institute, UMR7592, Paris-Diderot University, Centre National de la Recherche Scientifique, 75013 Paris, France
| | - Luca Cirillo
- Department of Cellular Physiology and Metabolism, Faculty of Medicine, University of Geneva, 1211 Geneva 4, Switzerland
| | - Costanza Panbianco
- Department of Cellular Physiology and Metabolism, Faculty of Medicine, University of Geneva, 1211 Geneva 4, Switzerland
| | - Lisa Martino
- Jacques Monod Institute, UMR7592, Paris-Diderot University, Centre National de la Recherche Scientifique, 75013 Paris, France
| | - Nicolas Tavernier
- Jacques Monod Institute, UMR7592, Paris-Diderot University, Centre National de la Recherche Scientifique, 75013 Paris, France
| | - Françoise Schwager
- Department of Cellular Physiology and Metabolism, Faculty of Medicine, University of Geneva, 1211 Geneva 4, Switzerland
| | - Lucie Van Hove
- Jacques Monod Institute, UMR7592, Paris-Diderot University, Centre National de la Recherche Scientifique, 75013 Paris, France
| | - Nicolas Joly
- Jacques Monod Institute, UMR7592, Paris-Diderot University, Centre National de la Recherche Scientifique, 75013 Paris, France
| | - Anna Santamaria
- Cell Cycle and Ovarian Cancer Group, Biomedical Research Unit in Gynecology, Collserola Building, Vall Hebron Research Institute, 08035 Barcelona, Spain
| | - Lionel Pintard
- Jacques Monod Institute, UMR7592, Paris-Diderot University, Centre National de la Recherche Scientifique, 75013 Paris, France.
| | - Monica Gotta
- Department of Cellular Physiology and Metabolism, Faculty of Medicine, University of Geneva, 1211 Geneva 4, Switzerland; Swiss National Centre for Competence in Research Program Chemical Biology, 1211 Geneva, Switzerland.
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Ndong Ntoutoume GMA, Granet R, Mbakidi JP, Brégier F, Léger DY, Fidanzi-Dugas C, Lequart V, Joly N, Liagre B, Chaleix V, Sol V. Development of curcumin-cyclodextrin/cellulose nanocrystals complexes: New anticancer drug delivery systems. Bioorg Med Chem Lett 2015; 26:941-945. [PMID: 26739777 DOI: 10.1016/j.bmcl.2015.12.060] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [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: 11/08/2015] [Revised: 12/16/2015] [Accepted: 12/17/2015] [Indexed: 12/22/2022]
Abstract
The synthesis of curcumin-cyclodextrin/cellulose nanocrystals (CNCx) nano complexes was performed. CNCx were functionalized by ionic association with cationic β-cyclodextrin (CD) and CD/CNCx complexes were used to encapsulate curcumin. Preliminary in vitro results showed that the resulting curcumin-CD/CNCx complexes exerted antiproliferative effect on colorectal and prostatic cancer cell lines, with IC50s lower than that of curcumin alone.
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Affiliation(s)
| | - Robert Granet
- Université de Limoges, Laboratoire de Chimie des Substances Naturelles, EA 1069, F-87000 Limoges, France
| | - Jean Pierre Mbakidi
- Université de Limoges, Laboratoire de Chimie des Substances Naturelles, EA 1069, F-87000 Limoges, France
| | - Frédérique Brégier
- Université de Limoges, Laboratoire de Chimie des Substances Naturelles, EA 1069, F-87000 Limoges, France
| | - David Y Léger
- Université de Limoges, Laboratoire de Chimie des Substances Naturelles, EA 1069, F-87000 Limoges, France
| | - Chloë Fidanzi-Dugas
- Université de Limoges, Laboratoire de Chimie des Substances Naturelles, EA 1069, F-87000 Limoges, France
| | - Vincent Lequart
- Université d'Artois, IUT de Béthune, 1230 rue de l'Université, 62408 Béthune Cedex, France
| | - Nicolas Joly
- Université d'Artois, IUT de Béthune, 1230 rue de l'Université, 62408 Béthune Cedex, France
| | - Bertrand Liagre
- Université de Limoges, Laboratoire de Chimie des Substances Naturelles, EA 1069, F-87000 Limoges, France
| | - Vincent Chaleix
- Université de Limoges, Laboratoire de Chimie des Substances Naturelles, EA 1069, F-87000 Limoges, France
| | - Vincent Sol
- Université de Limoges, Laboratoire de Chimie des Substances Naturelles, EA 1069, F-87000 Limoges, France.
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Chardonnet F, Capdevielle-Dulac C, Chouquet B, Joly N, Harry M, Le Ru B, Silvain JF, Kaiser L. Food searching behaviour of a Lepidoptera pest species is modulated by the foraging gene polymorphism. ACTA ACUST UNITED AC 2015; 217:3465-73. [PMID: 25274324 DOI: 10.1242/jeb.108258] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The extent of damage to crop plants from pest insects depends on the foraging behaviour of the insect's feeding stage. Little is known, however, about the genetic and molecular bases of foraging behaviour in phytophagous pest insects. The foraging gene (for), a candidate gene encoding a PKG-I, has an evolutionarily conserved function in feeding strategies. Until now, for had never been studied in Lepidoptera, which includes major pest species. The cereal stem borer Sesamia nonagrioides is therefore a relevant species within this order with which to study conservation of and polymorphism in the for gene, and its role in foraging - a behavioural trait that is directly associated with plant injuries. Full sequencing of for cDNA in S. nonagrioides revealed a high degree of conservation with other insect taxa. Activation of PKG by a cGMP analogue increased larval foraging activity, measured by how frequently larvae moved between food patches in an actimeter. We found one non-synonymous allelic variation in a natural population that defined two allelic variants. These variants presented significantly different levels of foraging activity, and the behaviour was positively correlated to gene expression levels. Our results show that for gene function is conserved in this species of Lepidoptera, and describe an original case of a single nucleotide polymorphism associated with foraging behaviour variation in a pest insect. By illustrating how variation in this single gene can predict phenotype, this work opens new perspectives into the evolutionary context of insect adaptation to plants, as well as pest management.
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Affiliation(s)
- Floriane Chardonnet
- Laboratoire Evolution Génome et Spéciation, CNRS UPR 9034, IRD UR 072 and Université Paris Sud Orsay, 1 Avenue de la Terrasse, 91198 Gif sur Yvette, France
| | - Claire Capdevielle-Dulac
- Laboratoire Evolution Génome et Spéciation, CNRS UPR 9034, IRD UR 072 and Université Paris Sud Orsay, 1 Avenue de la Terrasse, 91198 Gif sur Yvette, France
| | - Bastien Chouquet
- Laboratoire Evolution Génome et Spéciation, CNRS UPR 9034, IRD UR 072 and Université Paris Sud Orsay, 1 Avenue de la Terrasse, 91198 Gif sur Yvette, France
| | - Nicolas Joly
- Laboratoire Evolution Génome et Spéciation, CNRS UPR 9034, IRD UR 072 and Université Paris Sud Orsay, 1 Avenue de la Terrasse, 91198 Gif sur Yvette, France
| | - Myriam Harry
- Laboratoire Evolution Génome et Spéciation, CNRS UPR 9034, IRD UR 072 and Université Paris Sud Orsay, 1 Avenue de la Terrasse, 91198 Gif sur Yvette, France
| | - Bruno Le Ru
- Laboratoire Evolution Génome et Spéciation, CNRS UPR 9034, IRD UR 072 and Université Paris Sud Orsay, 1 Avenue de la Terrasse, 91198 Gif sur Yvette, France icipe - African Insect Science for Food and Health, Duduville Campus, Kasarani, PO Box 30772-00100, Nairobi, Kenya
| | - Jean-François Silvain
- Laboratoire Evolution Génome et Spéciation, CNRS UPR 9034, IRD UR 072 and Université Paris Sud Orsay, 1 Avenue de la Terrasse, 91198 Gif sur Yvette, France
| | - Laure Kaiser
- Laboratoire Evolution Génome et Spéciation, CNRS UPR 9034, IRD UR 072 and Université Paris Sud Orsay, 1 Avenue de la Terrasse, 91198 Gif sur Yvette, France INRA, UMR 1392, Institut d'Ecologie et des Sciences de l'Environnement de Paris, France
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Buck M, Engl C, Joly N, Jovanovic G, Jovanovic M, Lawton E, McDonald C, Schumacher J, Waite C, Zhang N. In vitro and in vivo methodologies for studying the Sigma 54-dependent transcription. Methods Mol Biol 2015; 1276:53-79. [PMID: 25665558 DOI: 10.1007/978-1-4939-2392-2_4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Here we describe approaches and methods to assaying in vitro the major variant bacterial sigma factor, Sigma 54 (σ(54)), in a purified system. We include the complete transcription system, binding interactions between σ54 and its activators, as well as the self-assembly and the critical ATPase activity of the cognate activators which serve to remodel the closed promoter complexes. We also present in vivo methodologies that are used to study the impact of physiological processes, metabolic states, global signalling networks, and cellular architecture on the control of σ(54)-dependent gene expression.
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Affiliation(s)
- Martin Buck
- Department of Life Sciences, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK,
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Banoub J, Delmas GH, Joly N, Mackenzie G, Cachet N, Benjelloun-Mlayah B, Delmas M. A critique on the structural analysis of lignins and application of novel tandem mass spectrometric strategies to determine lignin sequencing. J Mass Spectrom 2015; 50:5-48. [PMID: 25601673 DOI: 10.1002/jms.3541] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 10/31/2014] [Accepted: 11/03/2014] [Indexed: 05/27/2023]
Abstract
This review is devoted to the application of MS using soft ionization methods with a special emphasis on electrospray ionization, atmospheric pressure photoionization and matrix-assisted laser desorption/ionization MS and tandem MS (MS/MS) for the elucidation of the chemical structure of native and modified lignins. We describe and critically evaluate how these soft ionization methods have contributed to the present-day knowledge of the structure of lignins. Herein, we will introduce new nomenclature concerning the chemical state of lignins, namely, virgin released lignins (VRLs) and processed modified lignins (PML). VRLs are obtained by liberation of lignins through degradation of vegetable matter by either chemical hydrolysis and/or enzymatic hydrolysis. PMLs are produced by subjecting the VRL to a series of further chemical transformations and purifications that are likely to alter their original chemical structures. We are proposing that native lignin polymers, present in the lignocellulosic biomass, are not made of macromolecules linked to cellulose fibres as has been frequently reported. Instead, we propose that the lignins are composed of vast series of linear related oligomers, having different lengths that are covalently linked in a criss-cross pattern to cellulose and hemicellulose fibres forming the network of vegetal matter. Consequently, structural elucidation of VRLs, which presumably have not been purified and processed by any other type of additional chemical treatment and purification, may reflect the structure of the native lignin. In this review, we present an introduction to a MS/MS top-down concept of lignin sequencing and how this technique may be used to address the challenge of characterizing the structure of VRLs. Finally, we offer the case that although lignins have been reported to have very high or high molecular weights, they might not exist on the basis that such polymers have never been identified by the mild ionizing techniques used in modern MS.
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Affiliation(s)
- Joseph Banoub
- Department of Chemistry, Memorial University of Newfoundland, St John's, Newfoundland, A1C 5X1, Canada; Science Branch, Special Projects, Fisheries and Oceans Canada, St John's, NL, A1C 5X1, Canada
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Fan J, Savery N, Joly N, Strick T. Single-Molecule Analysis of Transcription-Coupled Repair. Biophys J 2015. [DOI: 10.1016/j.bpj.2014.11.403] [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: 10/24/2022] Open
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Darbari VC, Lawton E, Lu D, Burrows PC, Wiesler S, Joly N, Zhang N, Zhang X, Buck M. Molecular basis of nucleotide-dependent substrate engagement and remodeling by an AAA+ activator. Nucleic Acids Res 2014; 42:9249-61. [PMID: 25063294 PMCID: PMC4132715 DOI: 10.1093/nar/gku588] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Binding and hydrolysis of ATP is universally required by AAA+ proteins to underpin their mechano-chemical work. Here we explore the roles of the ATPase site in an AAA+ transcriptional activator protein, the phage shock protein F (PspF), by specifically altering the Walker B motif sequence required in catalyzing ATP hydrolysis. One such mutant, the E108Q variant, is defective in ATP hydrolysis but fully remodels target transcription complexes, the RNAP-σ54 holoenzyme, in an ATP dependent manner. Structural analysis of the E108Q variant reveals that unlike wild-type protein, which has distinct conformations for E108 residue in the ATP and ADP bound forms, E108Q adapts the same conformation irrespective of nucleotide bound. Our data show that the remodeling activities of E108Q are strongly favored on pre-melted DNA and engagement with RNAP-σ54 using ATP binding can be sufficient to convert the inactive holoenzyme to an active form, while hydrolysis per se is required for nucleic acid remodeling that leads to transcription bubble formation. Furthermore, using linked dimer constructs, we show that RNAP-σ54 engagement by adjacent subunits within a hexamer are required for this protein remodeling activity while DNA remodeling activity can tolerate defective ATP hydrolysis of alternating subunits.
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Affiliation(s)
- Vidya C Darbari
- Department of Life Sciences, Imperial College London, London SW7 2AZ, UK
| | - Ed Lawton
- Department of Life Sciences, Imperial College London, London SW7 2AZ, UK
| | - Duo Lu
- Department of Life Sciences, Imperial College London, London SW7 2AZ, UK
| | - Patricia C Burrows
- Department of Life Sciences, Imperial College London, London SW7 2AZ, UK
| | - Simone Wiesler
- Department of Life Sciences, Imperial College London, London SW7 2AZ, UK
| | - Nicolas Joly
- Department of Life Sciences, Imperial College London, London SW7 2AZ, UK
| | - Nan Zhang
- Department of Life Sciences, Imperial College London, London SW7 2AZ, UK
| | - Xiaodong Zhang
- Department of Life Sciences, Imperial College London, London SW7 2AZ, UK
| | - Martin Buck
- Department of Life Sciences, Imperial College London, London SW7 2AZ, UK
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Lavergne T, Durand S, Joly N, Bruneau M. Analytical Modeling of Electrostatic Transducers in Gases: Behavior of Their Membrane and Sensitivity. ACTA ACUST UNITED AC 2014. [DOI: 10.3813/aaa.918724] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Honzík P, Podkovskiy A, Durand S, Joly N, Bruneau M. Analytical and numerical modeling of an axisymmetrical electrostatic transducer with interior geometrical discontinuity. J Acoust Soc Am 2013; 134:3573-3579. [PMID: 24180768 DOI: 10.1121/1.4824342] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The main purpose of the paper is to contribute at presenting an analytical and a numerical modeling which would be relevant for interpreting the couplings between a circular membrane, a peripheral cavity having the same external radius as the membrane, and a thin air gap (with a geometrical discontinuity between them), and then to characterize small scale electrostatic receivers and to propose procedures that could be suitable for fitting adjustable parameters to achieve optimal behavior in terms of sensitivity and bandwidth expected. Therefore, comparison between these theoretical methods and characterization of several shapes is dealt with, which show that the models would be appropriate to address the design of such transducers.
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Affiliation(s)
- Petr Honzík
- LUNAM Université, LAUM (Laboratoire d'acoustique de l'université du Maine), UMR CNRS 6613, Avenue Olivier Messiaen, F-72085 Le Mans, France
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Zhang N, Gordiyenko Y, Joly N, Lawton E, Robinson CV, Buck M. Subunit dynamics and nucleotide-dependent asymmetry of an AAA(+) transcription complex. J Mol Biol 2013; 426:71-83. [PMID: 24055699 DOI: 10.1016/j.jmb.2013.08.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Revised: 08/21/2013] [Accepted: 08/24/2013] [Indexed: 01/22/2023]
Abstract
Bacterial enhancer binding proteins (bEBPs) are transcription activators that belong to the AAA(+) protein family. They form higher-order self-assemblies to regulate transcription initiation at stress response and pathogenic promoters. The precise mechanism by which these ATPases utilize ATP binding and hydrolysis energy to remodel their substrates remains unclear. Here we employed mass spectrometry of intact complexes to investigate subunit dynamics and nucleotide occupancy of the AAA(+) domain of one well-studied bEBP in complex with its substrate, the σ(54) subunit of RNA polymerase. Our results demonstrate that the free AAA(+) domain undergoes significant changes in oligomeric states and nucleotide occupancy upon σ(54) binding. Such changes likely correlate with one transition state of ATP and are associated with an open spiral ring formation that is vital for asymmetric subunit function and interface communication. We confirmed that the asymmetric subunit functionality persists for open promoter complex formation using single-chain forms of bEBP lacking the full complement of intact ATP hydrolysis sites. Outcomes reconcile low- and high-resolution structures and yield a partial sequential ATP hydrolysis model for bEBPs.
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Affiliation(s)
- Nan Zhang
- Division of Cell and Molecular Biology, Sir Alexander Fleming Building, Imperial College London, Exhibition Road, London SW7 2AZ, UK.
| | - Yuliya Gordiyenko
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, UK
| | - Nicolas Joly
- Institut Jacques Monod, CNRS UMR 7592, Université Paris Diderot, Batiment Buffon, 15 rue Helene Brion, 75205 Paris Cedex 13, France
| | - Edward Lawton
- Division of Cell and Molecular Biology, Sir Alexander Fleming Building, Imperial College London, Exhibition Road, London SW7 2AZ, UK
| | - Carol V Robinson
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, UK.
| | - Martin Buck
- Division of Cell and Molecular Biology, Sir Alexander Fleming Building, Imperial College London, Exhibition Road, London SW7 2AZ, UK.
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Honzík P, Durand S, Joly N, Bruneau M. On the Acoustic Transfer Function of Slowly Tapered Small Horns Filled With Thermo-Viscous Fluid. ACTA ACUST UNITED AC 2013. [DOI: 10.3813/aaa.918648] [Citation(s) in RCA: 3] [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: 11/06/2022]
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Lavergne T, Joly N, Durand S. Acoustic Thermal Boundary Condition on Thin Bodies: Application to Membranes and Fibres. ACTA ACUST UNITED AC 2013. [DOI: 10.3813/aaa.918632] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Monnet J, Grange W, Strick TR, Joly N. Mfd as a central partner of transcription coupled repair. Transcription 2013; 4:109-13. [PMID: 23756341 PMCID: PMC4042583 DOI: 10.4161/trns.24934] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Revised: 05/03/2013] [Accepted: 05/03/2013] [Indexed: 01/14/2023] Open
Abstract
Transcription-coupled repair (TCR) is one of the key of the nucleotide excision repair (NER) pathways required to preserve genome integrity. Although understanding TCR is still a major challenge, recent single-molecule experiments have brought new insights into the initial steps of TCR leading to new perspectives.
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Affiliation(s)
- Jordan Monnet
- Institut Jacques Monod; CNRS UMR 7592; Université Paris Diderot; Sorbonne Paris Cité F-75205; Paris, France
| | - Wilfried Grange
- Institut Jacques Monod; CNRS UMR 7592; Université Paris Diderot; Sorbonne Paris Cité F-75205; Paris, France
| | - Terence R Strick
- Institut Jacques Monod; CNRS UMR 7592; Université Paris Diderot; Sorbonne Paris Cité F-75205; Paris, France
| | - Nicolas Joly
- Institut Jacques Monod; CNRS UMR 7592; Université Paris Diderot; Sorbonne Paris Cité F-75205; Paris, France
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Howan K, Smith AJ, Westblade LF, Joly N, Grange W, Zorman S, Darst SA, Savery NJ, Strick TR. Initiation of transcription-coupled repair characterized at single-molecule resolution. Nature 2012; 490:431-4. [PMID: 22960746 PMCID: PMC3475728 DOI: 10.1038/nature11430] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [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: 01/03/2012] [Accepted: 07/20/2012] [Indexed: 12/02/2022]
Abstract
Transcription-coupled repair employs components of the transcription machinery to identify DNA lesions and initiate their repair. These repair pathways are complex so their mechanistic features remain poorly understood. Bacterial transcription-coupled repair is initiated when RNA polymerase stalled at a DNA lesion is removed by Mfd, an ATP-dependent DNA translocase [1–3]. Here we use single-molecule DNA nanomanipulation to observe the dynamic interactions of E. coli Mfd with RNA polymerase elongation complexes stalled by a cyclopyrimidine dimer or by nucleotide starvation. We show that Mfd acts by catalyzing two irreversible, ATP-dependent steps with different structural, kinetic, and mechanistic features. Mfd remains bound to the DNA in a long-lived complex that could serve as a marker for sites of DNA damage, directing assembly of subsequent DNA repair factors. These results provide a framework for considering the kinetics of transcription-coupled repair in vivo, and open the way to reconstruction of complete DNA repair pathways at single-molecule resolution.
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Affiliation(s)
- Kévin Howan
- Institut Jacques Monod, CNRS, UMR 7592, University Paris Diderot, Sorbonne Paris Cité F-75205 Paris, France
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Joly N, Zhang N, Buck M. ATPase site architecture is required for self-assembly and remodeling activity of a hexameric AAA+ transcriptional activator. Mol Cell 2012; 47:484-90. [PMID: 22789710 PMCID: PMC3419264 DOI: 10.1016/j.molcel.2012.06.012] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Revised: 05/31/2012] [Accepted: 06/01/2012] [Indexed: 11/16/2022]
Abstract
AAA+ proteins (ATPases associated with various cellular activities) are oligomeric ATPases that use ATP hydrolysis to remodel their substrates. By similarity with GTPases, a dynamic organization of the nucleotide-binding pockets between ATPase protomers is proposed to regulate functionality. Using the transcription activator PspF as an AAA+ model, we investigated contributions of conserved residues for roles in ATP hydrolysis and intersubunit communication. We determined the R-finger residue and revealed that it resides in a conserved “R-hand” motif (RxDxxxR) needed for its “trans-acting” activity. Further, a divergent Walker A glutamic acid residue acts synergistically with a tyrosine residue to function in ADP-dependent subunit-subunit coordination, forming the “ADP-switch” motif. Another glutamic acid controls hexamer formation in the presence of nucleotides. Together, these results lead to a “residue-nucleotide” interaction map upon which to base AAA+ core regulation.
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Affiliation(s)
- Nicolas Joly
- Division of Biology, Sir Alexander Fleming Building, Imperial College London, Exhibition Road, London SW7 2AZ, UK
- Corresponding author
| | - Nan Zhang
- Division of Biology, Sir Alexander Fleming Building, Imperial College London, Exhibition Road, London SW7 2AZ, UK
| | - Martin Buck
- Division of Biology, Sir Alexander Fleming Building, Imperial College London, Exhibition Road, London SW7 2AZ, UK
- Corresponding author
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Richet E, Davidson AL, Joly N. The ABC transporter MalFGK(2) sequesters the MalT transcription factor at the membrane in the absence of cognate substrate. Mol Microbiol 2012; 85:632-47. [PMID: 22715926 DOI: 10.1111/j.1365-2958.2012.08137.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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
MalK, the cytoplasmic component of the maltose ABC transporter from Escherichia coli is known to control negatively the activity of MalT, the activator of the maltose regulon, through complex formation. Here we further investigate this regulatory process by monitoring MalT activity and performing fluorescence microscopy analyses under various conditions. We establish that, under physiological conditions, the molecular entity that interacts with MalT is not free MalK, but the maltose transporter, MalFGK(2) , which sequesters MalT to the membrane. Furthermore, we provide compelling evidence that the transporter's ability to bind MalT is not constitutive, but strongly diminished when MalFGK(2) is engaged in sugar transport. Notably, the outward-facing transporter, i.e. the catalytic intermediate, is ineffective in inhibiting MalT compared to the inward-facing state, i.e. the resting form. Analyses of available genetic and structural data suggest how the interaction between one inactive MalT molecule and MalFGK(2) would be sensitive to the transporter state, thereby allowing MalT release upon maltose entrance. A related mechanism may underpin signalling by other ABC transporters.
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Affiliation(s)
- Evelyne Richet
- Institut Pasteur, Unité de Génétique Moléculaire, Département de Microbiologie, 25 rue du Dr. Roux, F-75015 Paris, France.
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Zhang N, Joly N, Buck M. A common feature from different subunits of a homomeric AAA+ protein contacts three spatially distinct transcription elements. Nucleic Acids Res 2012; 40:9139-52. [PMID: 22772990 PMCID: PMC3467059 DOI: 10.1093/nar/gks661] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [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] [Indexed: 01/24/2023] Open
Abstract
Initiation of σ(54)-dependent transcription requires assistance to melt DNA at the promoter site but is impeded by numerous protein-protein and nucleo-protein interactions. To alleviate these inhibitory interactions, hexameric bacterial enhancer binding proteins (bEBP), a subset of the ATPases associated with various cellular activities (AAA+) protein family, are required to remodel the transcription complex using energy derived from ATP hydrolysis. However, neither the process of energy conversion nor the internal architecture of the closed promoter complex is well understood. Escherichia coli Phage shock protein F (PspF), a well-studied bEBP, contains a surface-exposed loop 1 (L1). L1 is key to the energy coupling process by interacting with Region I of σ(54) (σ(54)(RI)) in a nucleotide dependent manner. Our analyses uncover new levels of complexity in the engagement of a multimeric bEBP with a basal transcription complex via several L1s. The mechanistic implications for these multivalent L1 interactions are elaborated in the light of available structures for the bEBP and its target complexes.
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Affiliation(s)
- Nan Zhang
- Division of Biology, Sir Alexander Fleming Building, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
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Villa A, Poupon J, Sageot H, Payen D, Blot F, Joly N, Langrand J, Garnier R. Évaluation des expositions à des médicaments anticancéreux des personnels participant aux soins postopératoires des malades traités par chimiohyperthermie intrapéritonéale. ARCH MAL PROF ENVIRO 2012. [DOI: 10.1016/j.admp.2012.03.263] [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: 11/27/2022]
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Villa A, Poupon J, Sageot H, Pocard M, Elias D, Joly N, Langrand J, Garnier R. Évaluation des expositions à des médicaments anticancéreux des personnels participant à des traitements par chimiohyperthermie intrapéritonéale. ARCH MAL PROF ENVIRO 2012. [DOI: 10.1016/j.admp.2012.03.262] [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: 11/25/2022]
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