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Spatial self-organization of enzymes in complex reaction networks
Vincent Ouazan-Reboul, Ramin Golestanian, Jaime Agudo-Canalejo
Living systems contain intricate biochemical networks whose structure is closely related to their function and allows them to exhibit robust behavior in the presence of external st…
Collective self-caging of active filaments in virtual confinement
Maximilian Kurjahn, Leila Abbaspour, Franziska Papenfuß +4
Motility coupled to responsive behavior is essential for many microorganisms to seek and establish appropriate habitats. One of the simplest possible responses, reversing the direc…
Sustained unidirectional rotation of a self-organized DNA rotor on a nanopore
Xin Shi, Anna-Katharina Pumm, Jonas Isensee +6
Flow-driven rotary motors drive functional processes in human society such as windmills and water wheels. Although examples of such rotary motors also feature prominently in cell b…
A DNA turbine powered by a transmembrane potential across a nanopore
Xin Shi, Anna-Katharina Pumm, Christopher Maffeo +8
Rotary motors play key roles in energy transduction, from macroscale windmills to nanoscale turbines such as ATP synthase in cells. Despite our capabilities to construct engines at…
Catalysis-Induced Phase Separation and Autoregulation of Enzymatic Activity
Matthew W. Cotton, Ramin Golestanian, Jaime Agudo-Canalejo
We present a thermodynamically consistent model describing the dynamics of a multi-component mixture where one enzyme component catalyzes a reaction between other components. We fi…
Comment on "Relative Diffusivities of Bound and Unbound Protein Can Control Chemotactic Directionality''
Jaime Agudo-Canalejo, Pierre Illien, Ramin Golestanian
This is a comment on a recently published paper in Langmuir: Mandal, N. S.; Sen, A. Relative Diffusivities of Bound and Unbound Protein Can Control Chemotactic Directionality. Lang…
Enhanced diffusion and chemotaxis at the nanoscale
Jaime Agudo-Canalejo, Tunrayo Adeleke-Larodo, Pierre Illien +1
Enzymes have been recently proposed to have mechanical activity associated with their chemical activity. In a number of recent studies, it has been reported that enzymes undergo en…
Phoresis and Enhanced Diffusion Compete in Enzyme Chemotaxis
Jaime Agudo-Canalejo, Pierre Illien, Ramin Golestanian
Chemotaxis of enzymes in response to gradients in the concentration of their substrate has been widely reported in recent experiments, but a basic understanding of the process is s…
Optimal navigation strategies for microswimmers on curved manifolds
Lorenzo Piro, Evelyn Tang, Ramin Golestanian
Finding the fastest path to a desired destination is a vitally important task for microorganisms moving in a fluid flow. We study this problem by building an analytical formalism f…
Flagella-like beating of a single microtubule
Andrej Vilfan, Smrithika Subramani, Eberhard Bodenschatz +2
Kinesin motors can induce a buckling instability in a microtubule with a fixed minus end. Here we show that by modifying the surface with a protein-repellent functionalization and…
Pairing, waltzing and scattering of chemotactic active colloids
Suropriya Saha, Sriram Ramaswamy, Ramin Golestanian
An interacting pair of chemotactic (anti-chemotactic) active colloids, that can rotate their axes of self-propulsion to align {parallel (anti-parallel)} to a chemical gradient, sho…
Trail-Mediated Self-Interaction
W. Till Kranz, Ramin Golestanian
A number of microorganisms leave persistent trails while moving along surfaces. For single-cell organisms, the trail-mediated self-interaction will influence its dynamics. It has b…
Shape of the Growing Front of Biofilms
Xin Wang, Howard A. Stone, Ramin Golestanian
The spatial organization of bacteria in dense biofilms is key to their collective behaviour, and understanding it will be important for medical and technological applications. Here…
Pattern formation by curvature-inducing proteins on spherical membranes
Jaime Agudo-Canalejo, Ramin Golestanian
Spatial organisation is a hallmark of all living cells, and recreating it in model systems is a necessary step in the creation of synthetic cells. It is therefore of both fundament…
Exothermicity is not a necessary condition for enhanced diffusion of enzymes
Pierre Illien, Xi Zhao, Krishna K. Dey +3
Recent experiments have revealed that the diffusivity of exothermic and fast enzymes is enhanced when they are catalytically active, and different physical mechanisms have been exp…
The Power Spectrum of Ionic Nanopore Currents: The Role of Ion Correlations
Mira Zorkot, Ramin Golestanian, Douwe Jan Bonthuis
We calculate the power spectrum of electric-field-driven ion transport through cylindrical nanometer-scale pores using both linearized mean-field theory and Langevin dynamics simul…
Effective dynamics of microorganisms that interact with their own trail
W. Till Kranz, Anatolij Gelimson, Kun Zhao +2
Like ants, some microorganisms are known to leave trails on surfaces to communicate. We explore how trail-mediated self-interaction could affect the behavior of individual microorg…
A steering mechanism for phototaxis in Chlamydomonas
Rachel R. Bennett, Ramin Golestanian
Chlamydomonas shows both positive and negative phototaxis. It has a single eyespot near its equator and as the cell rotates during forward motion the light signal received by the e…
Synthetic Mechanochemical Molecular Swimmer
Ramin Golestanian
A minimal design for a molecular swimmer is proposed that is a based on a mechanochemical propulsion mechanism. Conformational changes are induced by electrostatic actuation when s…
Coherent Hydrodynamic Coupling for Stochastic Swimmers
Ali Najafi, Ramin Golestanian
A recently developed theory of stochastic swimming is used to study the notion of coherence in active systems that couple via hydrodynamic interactions. It is shown that correlatio…