Molecular Self-Assembly as a Trigger of Life Origin and Development

Area of Science:

• Biochemistry
• Supramolecular Chemistry
• Origin of Life Studies

Background:

• Living cells exhibit homochirality, using a limited set of chiral building blocks (monomers).
• The reason for this restricted selection of biological monomers remains a key question in understanding life's origins.
• This contrasts with the vast theoretical possibilities for chiral molecules.

Purpose of the Study:

• To investigate the potential role of supramolecular self-assembly in establishing homochirality.
• To explore the formation of helical supramolecular structures from homochiral amino acid solutions.
• To provide experimental evidence for a proposed mechanism in the origin of homochirality.

Main Methods:

• Precipitation of homochiral amino acid solutions.
• Observation and characterization of formed supramolecular structures.
• Analysis of chiral properties during structure formation.

Main Results:

• Homochiral amino acid solutions formed highly elongated helical supramolecular structures (strings) upon precipitation.
• The formation of these strings was observed to potentially facilitate spontaneous chiral purification.
• This study provides experimental data on string formation in actual homochiral amino acid systems, moving beyond prior biomimetic models.

Conclusions:

• The ability of homochiral amino acids to form helical supramolecular strings is a plausible mechanism contributing to the origin of homochirality in biological systems.
• This self-assembly process offers a potential explanation for the limited spectrum of monomers found in life.
• Further research into these supramolecular structures could illuminate fundamental aspects of prebiotic chemistry and the origin of life.