Early Life: Embracing the RNA World

Area of Science:

• Biochemistry
• Origin of Life Studies
• Molecular Biology

Background:

• The early evolution of life involved interactions between nucleic acids and amino acids.
• Understanding these interactions is key to deciphering the origin of the genetic code and fundamental cellular machinery.
• Artificial aptamers offer a model system to study these ancient molecular interactions.

Purpose of the Study:

• To investigate the physicochemical basis of interactions between RNA aptamers and amino acids.
• To explore potential biases in amino acid selection by RNA structures.
• To gain insights into the early steps of the origin of genetic information and protein synthesis.

Main Methods:

• Selection of artificial aptamers capable of binding to protein complexes.
• Analysis of the amino acid composition of bound proteins.
• Characterization of physicochemical properties of amino acid-RNA interactions.

Main Results:

• Protein complexes interacting with artificial aptamers demonstrated a significant bias towards arginine, tryptophan, and tyrosine.
• These amino acids possess physicochemical properties that favor interaction with RNA structures.
• The observed bias provides a potential mechanism for the preferential incorporation of certain amino acids in early peptides.

Conclusions:

• The study highlights a bias in amino acid composition within protein complexes bound by artificial aptamers, favoring arginine, tryptophan, and tyrosine.
• These findings suggest that specific physicochemical properties of amino acids and RNA may have guided the origin of the genetic code.
• This research provides a novel perspective on the early molecular evolution leading to the ribosome and genetic translation.