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Programmable viscoelasticity in protein-RNA condensates with disordered sticker-spacer polypeptides
Ibraheem Alshareedah1, Mahdi Muhammad Moosa1, Matthew Pham2
1Department of Physics, University at Buffalo, Buffalo, NY, 14260, USA.
Nature Communications
|November 17, 2021
Summary
Biomolecular condensates are network fluids whose viscoelastic properties depend on protein and RNA sequences. Researchers used microrheology to link molecular interactions to condensate mechanics, enabling programmable engineering.
Area of Science:
- Biophysics
- Molecular Biology
- Soft Matter Physics
Background:
- Biomolecular condensates form via liquid-liquid phase separation, creating membrane-free cellular compartments.
- These condensates exhibit time-dependent material properties, behaving as network fluids.
Purpose of the Study:
- To investigate the molecular determinants governing the viscoelastic behavior of condensates formed by Arg/Gly-rich polypeptides and RNA.
- To establish a quantitative link between molecular interactions and condensate mechanics.
Main Methods:
- Microrheology utilizing optical tweezers.
- Analysis of condensates formed by multivalent Arg/Gly-rich sticker-spacer polypeptides and RNA.
Main Results:
- Condensates exhibit Maxwell fluid behavior, with elastic properties at short timescales and liquid-like properties at longer timescales.
- Viscoelastic properties are tunable by altering polypeptide and RNA sequences and mixture compositions.
Conclusions:
- A quantitative relationship exists between sequence-encoded interactions and mesoscale condensate rheology.
- This provides a framework for engineering biomolecular condensates with programmable mechanical properties.
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