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Chirality- and sequence-selective successive self-sorting via specific homo- and complementary-duplex formations.

Wataru Makiguchi1, Junki Tanabe1, Hidekazu Yamada1

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Researchers created artificial molecules that can recognize and sort themselves based on chirality and sequence. This self-sorting process mimics biological systems, enabling the formation of specific molecular structures.

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Area of Science:

  • Supramolecular Chemistry
  • Chemical Biology
  • Materials Science

Background:

  • Biological systems rely on molecular self-recognition, sequence, and chirality for function.
  • Mimicking these properties in artificial systems is crucial for developing advanced materials and understanding life's origins.
  • Existing artificial systems often lack precise control over self-assembly based on multiple properties.

Purpose of the Study:

  • To design and synthesize artificial chiral dimeric strands capable of sequence- and chirality-selective self-sorting.
  • To investigate the formation of homoduplexes and complementary duplexes based on molecular structure and sequence.
  • To achieve high fidelity in self-assembly, mirroring biological macromolecular precision.

Main Methods:

  • Synthesis of chiral dimeric strands with carboxylic acid or amidine groups.
  • Utilized chiral amide linkers with varying sequences (e.g., NHCO, CONH).
  • Investigated self-assembly through homo- and complementary-duplex formation in mixtures.

Main Results:

  • Racemic carboxylic acid dimers self-assembled into sequence-selective homoduplexes, with structures dependent on linker amide sequences.
  • Addition of an enantiopure amidine dimer to racemic carboxylic acid dimers resulted in a single, optically pure complementary duplex.
  • Achieved 100% diastereoselectivity and complete sequence specificity in duplex formation, stabilized by salt bridges.

Conclusions:

  • Demonstrated a novel method for artificial chirality- and sequence-selective successive self-sorting.
  • The system successfully discriminates between molecular components based on both chirality and sequence.
  • This work provides a foundation for creating complex, self-assembling artificial molecular systems with biological precision.