Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session F15: Rheology and Mechanics of Polymers
8:00 AM–10:36 AM,
Tuesday, March 7, 2023
Room: Room 207
Sponsoring
Unit:
DPOLY
Chair: Konane Bay, Princeton University
Abstract: F15.00009 : Motor-free contractility in light-controlled in-vitro protein networks
10:00 AM–10:12 AM
Presenter:
Tuhin Chakrabortty
(Georgia Inst Technol - Atlanta, GA)
Authors:
Tuhin Chakrabortty
(Georgia Inst Technol - Atlanta, GA)
Xiangting Lei
(Georgia Institute of Technology)
Jerry E Honts
(Drake University)
Saad Bhamla
(Georgia Institute of Technology)
Our system is composed of cortical proteins from ciliates of Tetrahymena which generate contractile visco-elastic networks when triggered by Ca2+ ions. The simple 2 species system can exhibit phase transitions from local individual protein clusters to contractile visco-elastic networks as a function of Ca2+ concentration. To study the network dynamics systematically, we also performed controlled experiments by using caged Ca2+ which enabled us to control Ca2+ concentration with an incident light source. Interestingly, by triggering the system with light pulses, we can generate an out-of-equilibrium viscoelastic network that breaks spatial symmetry by periodically contracting and relaxing. With the help of a physical model and numerical simulations, we provide an explanation for the observed behavior of the system.
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