Autocatalysis and organocatalysis with synthetic structures

Area of Science:

• Origin of life studies
• Synthetic organic chemistry
• Biochemistry

Background:

• The RNA world hypothesis proposes RNA molecules were central to early life, performing both genetic and catalytic functions.
• Ribozymes, catalytic RNA molecules, support the RNA world hypothesis.
• The precise chemical components of a pre-RNA world remain an active area of research.

Purpose of the Study:

• To engineer a synthetic molecule with dual catalytic capabilities: self-replication (autocatalysis) and catalysis of other reactions (organocatalysis).
• To investigate the potential role of smaller organic molecules in a pre-RNA world.
• To challenge the exclusive focus on RNA as the sole molecule of early life.

Main Methods:

• Design and synthesis of a novel organic compound.
• Experimental characterization of the compound's self-replication rate under varying conditions.
• Assaying the compound's catalytic activity in promoting hydrogenation and nucleophilic addition reactions with alpha,beta-unsaturated aldehydes.

Main Results:

• The synthetic compound demonstrated selective autocatalysis, accelerating its own formation.
• The compound effectively catalyzed specific organic reactions, including hydrogenation and nucleophilic addition.
• The observed dual reactivity was achieved within a single, engineered molecular structure.

Conclusions:

• Autocatalysis and organocatalysis can be engineered into a single synthetic molecule.
• This engineered molecule provides a model for how early life's chemical processes might have functioned.
• The findings support the hypothesis that smaller organic molecules, in addition to or preceding RNA, could have played a crucial role in abiogenesis.