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Beta-turn-driven early evolution: the genetic code and biosynthetic pathways.

J Jurka, T F Smith

Journal of Molecular Evolution

|January 1, 1987

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Beta-turns, crucial protein structures, may have influenced the genetic code's evolution due to their amino acid preferences. Their properties likely guided early life's biochemical pathways and amino acid selection.

Area of Science:

Biochemistry
Astrobiology
Molecular Evolution

Background:

Beta-turns are key secondary structures in proteins.
Their formation predates the genetic code.
Amino acid properties influence beta-turn formation.

Purpose of the Study:

To explore the role of beta-turns in the origin of the genetic code.
To investigate the link between beta-turn physicochemical properties and amino acid selection.
To propose a model for prebiotic selection involving beta-turns.

Main Methods:

Analysis of physicochemical properties of amino acids within beta-turn structures.
Correlation studies between amino acid abundance in beta-turns and their genetic code assignment.
Examination of amino acid metabolic pathways.

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Main Results:

Specific amino acid properties correlate with beta-turn preference.
Amino acid abundance in beta-turns aligns with their genetic code representation.
A subset of amino acids in beta-turns are linked to metabolic precursors.

Conclusions:

Beta-turns likely played a significant role in the prebiotic selection of amino acids.
The properties of beta-turns may have guided the evolution of the genetic code.
Beta-turns could have influenced the development of amino acid biosynthetic pathways.