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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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Oligolysine Enhances and Inhibits DNA Condensate Formation.

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Cationic oligolysines can enhance or inhibit DNA nanostructure condensate formation. The effects depend on the lysine charge (L/P ratio) and peptide length, offering insights for designing artificial biomolecular condensates.

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Area of Science:

  • Biomolecular chemistry
  • Nanotechnology
  • Synthetic biology

Background:

  • Biomolecular condensates form via phase separation and are crucial for cellular functions.
  • Designed DNA nanostructures allow for studying condensate formation mechanisms and creating artificial condensates.
  • Challenges exist in forming DNA nanostructures into condensates, prompting research into hybrid systems.

Purpose of the Study:

  • To investigate the impact of cationic oligolysines on DNA condensate formation using Y-shaped DNA nanostructures.
  • To determine how the charge ratio (L/P) and oligolysine residue number influence DNA condensate assembly.
  • To explore the potential of DNA/peptide hybrid condensates for applications in artificial cells and molecular robots.

Main Methods:

  • Assembly of Y-shaped DNA nanostructures.
  • Introduction of cationic oligolysines with varying residue numbers.
  • Analysis of condensate formation at different lysine-to-phosphate (L/P) ratios.
  • Assessment of nanostructure integrity and sequence-specific interactions.

Main Results:

  • Oligolysines enhanced DNA condensate formation at optimal L/P ratios, with five-residue oligolysines preserving DNA sequence interactions.
  • Conversely, other L/P ratios and residue numbers led to inhibition of condensate formation.
  • Nanostructure deformation by oligolysines was identified as a cause for inhibition.
  • Both the quantity and length of cationic peptides significantly influenced the self-assembly of branched DNA nanostructures.

Conclusions:

  • The study highlights the critical role of cationic peptide characteristics (amount and length) in modulating DNA nanostructure self-assembly and condensate formation.
  • Findings provide guidance for designing advanced DNA/peptide hybrid condensates.
  • This research contributes to the development of functional artificial condensates for applications in synthetic biology and nanotechnology.