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Vander Veken L, Van Ooteghem G, Longton E, Ledoux B, Abdel Massih C, Delvaux C, Henderickx P, Dechambre D, Delor A, Da Rita Quaresma S, Aude V, Geets X. PO-1141 Voluntary vs. mechanically induced DIBH for left breast cancer: a randomized trial. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07592-7] [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: 10/20/2022]
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Valéry C, Deville-Foillard S, Lefebvre C, Taberner N, Legrand P, Meneau F, Meriadec C, Delvaux C, Bizien T, Kasotakis E, Lopez-Iglesias C, Gall A, Bressanelli S, Le Du MH, Paternostre M, Artzner F. Atomic view of the histidine environment stabilizing higher-pH conformations of pH-dependent proteins. Nat Commun 2015; 6:7771. [PMID: 26190377 PMCID: PMC4518280 DOI: 10.1038/ncomms8771] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [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] [Received: 01/20/2015] [Accepted: 06/09/2015] [Indexed: 11/17/2022] Open
Abstract
External stimuli are powerful tools that naturally control protein assemblies and functions. For example, during viral entry and exit changes in pH are known to trigger large protein conformational changes. However, the molecular features stabilizing the higher pH structures remain unclear. Here we elucidate the conformational change of a self-assembling peptide that forms either small or large nanotubes dependent on the pH. The sub-angstrom high-pH peptide structure reveals a globular conformation stabilized through a strong histidine-serine H-bond and a tight histidine-aromatic packing. Lowering the pH induces histidine protonation, disrupts these interactions and triggers a large change to an extended β-sheet-based conformation. Re-visiting available structures of proteins with pH-dependent conformations reveals both histidine-containing aromatic pockets and histidine-serine proximity as key motifs in higher pH structures. The mechanism discovered in this study may thus be generally used by pH-dependent proteins and opens new prospects in the field of nanomaterials. In biological systems, large pH-induced conformational changes can be observed in certain proteins, a phenomenon poorly understood at the molecular level. Here the authors describe a peptide with the ability to self-organize into either small or large nanotubes in a pH-dependent manner and detail the mechanism driving the transition.
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Affiliation(s)
- Céline Valéry
- 1] Biomolecular Interaction Centre, School of Biological Sciences, University of Canterbury, 8140 Christchurch, New zealand [2] Ipsen, 5 Avenue du Canada, 91940 Les Ulis, France
| | - Stéphanie Deville-Foillard
- 1] Ipsen, 5 Avenue du Canada, 91940 Les Ulis, France [2] CEA, Institute of Biology and Technologies of Saclay, 91191 CEA-Saclay, France [3] Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, 91191 CEA-Saclay, Gif sur Yvette, France
| | - Christelle Lefebvre
- CNRS, UMR 6251, Institut de Physique de Rennes, 263 av. Général Leclerc, Université Rennes I, 35042 Rennes Cedex, France
| | | | | | | | - Cristelle Meriadec
- CNRS, UMR 6251, Institut de Physique de Rennes, 263 av. Général Leclerc, Université Rennes I, 35042 Rennes Cedex, France
| | - Camille Delvaux
- 1] CEA, Institute of Biology and Technologies of Saclay, 91191 CEA-Saclay, France [2] Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, 91191 CEA-Saclay, Gif sur Yvette, France
| | - Thomas Bizien
- CNRS, UMR 6251, Institut de Physique de Rennes, 263 av. Général Leclerc, Université Rennes I, 35042 Rennes Cedex, France
| | - Emmanouil Kasotakis
- 1] CEA, Institute of Biology and Technologies of Saclay, 91191 CEA-Saclay, France [2] Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, 91191 CEA-Saclay, Gif sur Yvette, France
| | - Carmen Lopez-Iglesias
- Cryo-Electron Microscopy Unit. Scientific and Tecnological Centers of the University of Barcelona, E-08028 Barcelona, Spain
| | - Andrew Gall
- 1] CEA, Institute of Biology and Technologies of Saclay, 91191 CEA-Saclay, France [2] Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, 91191 CEA-Saclay, Gif sur Yvette, France
| | - Stéphane Bressanelli
- 1] CEA, Institute of Biology and Technologies of Saclay, 91191 CEA-Saclay, France [2] Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, 91191 CEA-Saclay, Gif sur Yvette, France
| | - Marie-Hélène Le Du
- 1] CEA, Institute of Biology and Technologies of Saclay, 91191 CEA-Saclay, France [2] Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, 91191 CEA-Saclay, Gif sur Yvette, France
| | - Maïté Paternostre
- 1] CEA, Institute of Biology and Technologies of Saclay, 91191 CEA-Saclay, France [2] Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, 91191 CEA-Saclay, Gif sur Yvette, France
| | - Franck Artzner
- CNRS, UMR 6251, Institut de Physique de Rennes, 263 av. Général Leclerc, Université Rennes I, 35042 Rennes Cedex, France
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Abstract
Abstract. In the framework of the interdisciplinary FORBIO Climate research project, the Royal Meteorological Institute of Belgium is in charge of providing high resolution gridded past climate data (i.e. temperature and precipitation). This climate data set will be linked to the measurements on seedlings, saplings and mature trees to assess the effects of climate variation on tree performance. This paper explains how the gridded daily temperature (minimum and maximum) data set was generated from a consistent station network between 1980 and 2013. After station selection, data quality control procedures were developed and applied to the station records to ensure that only valid measurements will be involved in the gridding process. Thereafter, the set of unevenly distributed validated temperature data was interpolated on a 4 km × 4 km regular grid over Belgium. The performance of different interpolation methods has been assessed. The method of kriging with external drift using correlation between temperature and altitude gave the most relevant results.
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Gobeaux F, Fay N, Tarabout C, Meneau F, Mériadec C, Delvaux C, Cintrat JC, Valéry C, Artzner F, Paternostre M. Experimental observation of double-walled peptide nanotubes and monodispersity modeling of the number of walls. Langmuir 2013; 29:2739-2745. [PMID: 23368945 DOI: 10.1021/la304862f] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Self-assembled nanoarchitectures based on biological molecules are attractive because of the simplicity and versatility of the building blocks. However, size control is still a challenge. This control is only possible when a given system is deeply understood. Such is the case with the lanreotide acetate, an octapeptide salt that spontaneously forms monodisperse nanotubes when dissolved into pure water. Following a structural approach, we have in the past demonstrated the possibility to tune the diameter of these nanotubes while keeping a strict monodispersity, either by chemical modification of one precise amino acid on the peptide sequence or by changing the size of the counterions. On the basis of these previous studies, we replaced monovalent counterions by divalent ones to vary the number of walls. Indeed, in the present work, we show that lanreotide associated with a divalent counterion forms double-walled nanotubes while keeping the average diameter constant. However, the strict monodispersity of the number of walls was unexpected. We propose that the divalent counterions create an adhesion force that can drive the wall packing. This adhesion force is counterbalanced by a mechanical one that is related to the stiffness of the peptide wall. By taking into account these two opposite forces, we have built a general model that fully explains why the lanreotide nanotubes formed with divalent counterions possess two walls and not more.
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Affiliation(s)
- Frédéric Gobeaux
- Institut de Biologie et de Technologies de Saclay/Service de Bioénergétique, Biologie Structurale et Mécanismes, UMR 8221 CNRS and CEA, CEA-Saclay, 91191 Gif-sur-Yvette, France
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Mendes da Costa P, Ansay J, Beernaerts A, Blondiau R, Carlier P, Cornil C, Delvaux C, Demol J, Deschreyer M, Detry R, Dingens C, Govaerts JP, Hendrickx L, Huyghe J, Janne P, Khaddaj S, Lebec JC, Limbosch JM, Richir C, Steuve J, Vereecken L, Vossaert R. [Diverticular disease of the left colon. Belgian surgical experience. Multicenter study of 962 cases]. Acta Chir Belg 1983; 83:69-76. [PMID: 6858538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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