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Prebiotically-relevant low polyion multivalency can improve functionality of membraneless compartments.

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Shorter polyions form coacervates that better compartmentalize RNA and create distinct pH environments. These reduced multivalency compartments outperform longer polyion analogues for prebiotic chemistry.

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Area of Science:

  • Biochemistry
  • Origins of Life Research
  • Polymer Science

Background:

  • Multivalent polyions form complex coacervates, creating membraneless compartments crucial for early life.
  • These compartments can concentrate biomolecules like ribozymes, enhancing catalytic activity.
  • Understanding the role of polyion multivalency is key to prebiotic compartmentalization.

Purpose of the Study:

  • To investigate how lower, prebiotically relevant polyion multivalency affects coacervate compartment function.
  • To assess the performance of coacervates as functional compartments for prebiotic chemistry.
  • To compare coacervates formed from shorter versus longer model polyions.

Main Methods:

  • Used homopeptides and nucleotide triphosphates as model polyions with varying lengths.
  • Tested polycation/polyanion pairs for coacervation and analyzed compartment properties.
  • Evaluated salt resistance, internal microenvironment (pH, RNA partitioning), and RNA structure preservation.

Main Results:

  • Coacervates from shorter polyions exhibited more distinct pH microenvironments.
  • These coacervates showed enhanced RNA accumulation compared to those from longer polyions.
  • Coacervates formed by reduced multivalency polyions better preserved RNA duplexes.

Conclusions:

  • Coacervates formed by reduced multivalency polyions are effective for prebiotic chemistry.
  • Lower polyion multivalency leads to superior functional performance in coacervate compartments.
  • These findings support the viability of reduced multivalency coacervates in origins of life scenarios.