How Do Unstructured Proteins Create Condensates?

https://www.youtube.com/watch?v=ItzHiFUe-bo

Intrinsically disordered proteins (IDPs) lack stable folded structures and are enriched in charged and polar residues. IDPs form condensates whose material properties emerge from the interplay between long-range electrostatics and residue-specific short-range interactions. Condensate behavior arises from the superposition of charge-pattern–driven electrostatic cohesion and residue-specific local properties. When charges are scrambled, electrostatic forces decrease, whereas charge block formation enhances electrostatic forces. However, amino acid properties must also be taken into account, as they determine short-range interactions. Together, these two perspectives provide a better understanding of the viscoelastic and structural properties of condensates.

Mara-Héloïse Picot is a student in the Cell Physics Master at the University of Strasbourg, France.

Find the original scientific papers described in this video below

• Short-range interactions (curious about microrheology?) : I. Alshareedah, M. M. Moosa, M. Pham, D. A. Potoyan, and P. R. Banerjee, Programmable viscoelasticity in protein-RNA condensates with disordered sticker-spacer polypeptides, Nat Commun 12, 6620 (2021).

• Long-range interactions : Y.-H. Lin, J. D. Forman-Kay, and H. S. Chan, Sequence-Specific Polyampholyte Phase Separation in Membraneless Organelles, Phys. Rev. Lett. 117, 178101 (2016).