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(11) Production(s) de NERI I.
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Towards modelling motor protein driven cytoskeltal transport
Auteur(s): Kern N., Parmeggiani A., Raguin A., Neri I.
Conference: Mechanisms driving the organization of intra-cellular organelles (Zaragoza, ES, 2012-06-18)
Résumé: One important role which the cytoskeleton plays in cells is to provide a network of filaments along which molecular motors can procede. This provides an essential mechanism by which a cell can establish transport of cargos over distances of the order of the cell size. The details of how such motors achieve procession along the biofilaments constituting the cytoskeleton are very complex indeed, but much of their behaviour (including collective aspects of the transport) can be described in terms of well-established models, such as the Totally Asymmetric Transport Process (TASEP) or similar. These are well-studied on single filaments. Recent work has allowed us to establish a framework to transpose this understanding to an overall network of interconnected filaments, mimicking the cytoskeleton. We discuss how new aspects of heterogeneity arise on the network scale, and we aOne important role which the cytoskeleton plays in cells is to provide a network of filaments along which molecular motors can procede. This provides an essential mechanism by which a cell can establish transport of cargos over distances of the order of the cell size. The details of how such motors achieve procession along the biofilaments constituting the cytoskeleton are very complex indeed, but much of their behaviour (including collective aspects of the transport) can be described in terms of well-established models, such as the Totally Asymmetric Transport Process (TASEP) or similar. These are well-studied on single filaments. Recent work has allowed us to establish a framework to transpose this understanding to an overall network of interconnected filaments, mimicking the cytoskeleton. We discuss how new aspects of heterogeneity arise on the network scale, and we argue that they are generic to many types of transport on networks. We also present very recent ideas for incorporating more complex features aimed at applying the approach to cytoskeletal transport in particular.
rgue that they are generic to many types of transport on networks. We also present very recent ideas for incorporating more complex features aimed at applying the approach to cytoskeletal transport in particular.
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Active Transport on Networks
Auteur(s): Neri I.
(Séminaires)
Journées plénières du GDR Physique de la Cellule au Tissu (Lille, FR), 2011-10-13 |
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Totally asymmetric simple exclusion process on networks
Auteur(s): Neri I.
(Affiches/Poster)
Workshop on Systems Biology 2nd Baltic Autumn School (Lübeck, DE), 2011-09-07Texte intégral en Openaccess :
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Totally Asymmetric Simple Exclusion Process on Networks
Auteur(s): Neri I., Kern N., Parmeggiani A.
(Article) Publié:
Physical Review Letters, vol. 107 p.068702 (2011)
Texte intégral en Openaccess :
Ref HAL: hal-00617509_v1
DOI: 10.1103/PhysRevLett.107.068702
WoS: 000293562900005
Exporter : BibTex | endNote
78 Citations
Résumé: We study the totally asymmetric simple exclusion process (TASEP) on complex networks, as a paradigmatic model for transport subject to excluded volume interactions. Building on TASEP phenomenology on a single segment and borrowing ideas from random networks we investigate the effect of connectivity on transport. In particular, we argue that the presence of disorder in the topology of vertices crucially modifies the transport features of a network: irregular networks involve homogeneous segments and have a bimodal distribution of edge densities, whereas regular networks are dominated by shocks leading to a unimodal density distribution. The proposed numerical approach of solving for mean-field transport on networks provides a general framework for studying TASEP on large networks, and is expected to generalize to other transport processes.
Commentaires: arXiv:1105.2905v2; see also highlight in Physical Review Focus http://focus.aps.org/story/v28/st6
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