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Article Dans Une Revue European Physical Journal E: Soft matter and biological physics Année : 2021

Modelling the effect of ribosome mobility on the rate of protein synthesis

Olivier Dauloudet
  • Fonction : Auteur
Izaak Neri
  • Fonction : Auteur
Jerome Dorignac
  • Fonction : Auteur
  • PersonId : 1004442
Frederic Geniet
  • Fonction : Auteur
  • PersonId : 1004445

Résumé

Translation is one of the main steps in the synthesis of proteins. It consists of ribosomes that translate sequences of nucleotides encoded on mRNA into polypeptide sequences of amino acids. Ribosomes bound to mRNA move unidirectionally, while unbound ribosomes diffuse in the cytoplasm. It has been hypothesized that finite diffusion of ribosomes plays an important role in ribosome recycling and that mRNA circularization enhances the efficiency of translation. In order to estimate the effect of cytoplasmic diffusion on the rate of translation, we consider a Totally Asymmetric Simple Exclusion Process (TASEP) coupled to a finite diffusive reservoir, which we call the Ribosome Transport model with Diffusion (RTD). In this model, we derive an analytical expression for the rate of protein synthesis as a function of the diffusion constant of ribosomes, which is corroborated with results from continuous-time Monte Carlo simulations. Using a wide range of biological relevant parameters, we conclude that diffusion in biological cells is fast enough so that it does not play a role in controlling the rate of translation initiation.

Dates et versions

hal-02989969 , version 1 (05-11-2020)

Identifiants

Citer

Olivier Dauloudet, Izaak Neri, Jean-Charles Walter, Jerome Dorignac, Frederic Geniet, et al.. Modelling the effect of ribosome mobility on the rate of protein synthesis. European Physical Journal E: Soft matter and biological physics, 2021, 44, pp.19. ⟨10.1140/epje/s10189-021-00019-8⟩. ⟨hal-02989969⟩
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