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Multivalent Molecules as Modulators of RNA Granule Size and Composition.

Cibele Vieira Falkenberg1, John H Carson2, Michael L Blinov3

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|March 1, 2017
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This study models RNA granule assembly, revealing how hnRNP A2 proteins regulate interactions between RNA and CKAP5 (TOG) proteins. Distinct hnRNP A2 concentrations control granule formation, disruption, and RNA selectivity.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biophysics

Background:

  • RNA granules are crucial for localized translation in eukaryotic cells.
  • Mechanisms governing RNA granule formation and selectivity remain largely unknown.
  • Understanding these processes is key to deciphering cellular regulation.

Purpose of the Study:

  • To develop a model for RNA granule assembly.
  • To investigate the roles of specific RNA sequences (A2RE), hnRNP A2 proteins, and CKAP5 (TOG) in granule formation.
  • To elucidate how these components interact to control granule composition and dynamics.

Main Methods:

  • A hybrid modeling approach (deterministic-stochastic-statistical) was employed.
  • Experimentally measured binding interactions among core molecular components were utilized.
  • Modeling involved titrating component concentrations and varying affinities and RNA valency.

Main Results:

  • hnRNP A2 acts as a bivalent adaptor, modulating interactions between multivalent components (CKAP5/TOG and RNA).
  • Distinct concentration regimes of hnRNP A2 regulate granule formation, disruption, and RNA selectivity.
  • Non-A2RE RNA molecules can be recruited via nonspecific interactions.

Conclusions:

  • RNA granule assembly is tightly controlled by multivalent molecular interactions.
  • hnRNP A2 concentration is a critical regulatory factor in granule dynamics and composition.
  • The model provides insights into the fundamental principles of RNA granule formation and function.