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Preserving condensate structure and composition by lowering sequence complexity.

Amogh Sood¹, Bin Zhang¹

¹Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts.

Biophysical Journal

|June 2, 2024

Summary

Intrinsically disordered proteins (IDPs) form biomolecular condensates. Specific interactions drive organized condensate structures, while nonspecific interactions lead to disorder, highlighting a molecular grammar for cellular organization.

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Chemical Dimerization-Induced Protein Condensates on Telomeres

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Area of Science:

Biochemistry
Molecular Biology
Biophysics

Background:

Biomolecular condensates organize cellular chemistry by selectively partitioning molecules.
Intrinsically disordered proteins (IDPs) are key components due to their flexibility and multivalent interactions.
Understanding the sequence-structure-function relationship of IDPs in condensates is crucial.

Purpose of the Study:

To extend the stickers and spacers model for IDPs.
To investigate the role of specific and nonspecific interactions in condensate formation and organization.
To explore the link between evolutionary pressures and IDP sequence features.

Main Methods:

Theoretical modeling based on an extended stickers and spacers model.
Incorporation of heterogeneous, nonspecific pairwise interactions between spacers.
Analysis of specific sticker-sticker interactions.

Main Results:

Nonspecific spacer interactions promote phase separation but lead to disorganized condensates.
Specific sticker-sticker interactions are essential for forming condensates with defined structures and composition.
The model provides insights into the 'molecular grammar' governing condensate assembly.

Conclusions:

Specific interactions dictate the functional organization of biomolecular condensates.
Evolutionary pressures may favor low-complexity domains in IDPs to suppress spurious interactions and promote functional condensate formation.
This work advances the understanding of how IDP sequences encode biological function through condensate organization.