Non-Enzymatic Assembly of a Minimized RNA Polymerase Ribozyme

Area of Science:

• Origin of Life Studies
• Biochemistry
• Molecular Evolution

Background:

• The "RNA world" hypothesis posits RNA catalysts preceded DNA and proteins.
• RNA replicase ribozymes are complex; simpler non-enzymatic RNA replication likely came first.
• Templated polymerization of activated ribonucleotides offers a route to RNA pools for replicase emergence.

Purpose of the Study:

• To demonstrate the rapid assembly of complex ribozymes from activated RNA fragment pools.
• To investigate the transition from non-enzymatic to enzymatic RNA replication.
• To support the RNA world hypothesis by showing feasible RNA self-assembly.

Main Methods:

• Selection and characterization of a minimal RNA polymerase ribozyme variant (150 nucleotides).
• RNA-templated ligation of 5 egular-2-methylimidazole-activated RNA oligomers (less than 30 nucleotides).
• Utilizing phosphorimidazolide (Imp)-activated ribonucleotides for polymerization and replication.

Main Results:

• Successful rapid assembly of complex ribozymes from Imp-activated RNA fragment pools.
• Demonstrated RNA-templated ligation of short activated RNA oligomers to form a functional ribozyme.
• Generated short RNA oligomer pools capable of replication.

Conclusions:

• Complex RNA structures can emerge from pools of activated RNA oligomers.
• Provides a plausible pathway from non-enzymatic/chemical to enzymatic RNA replication.
• Supports the feasibility of RNA self-assembly in early life scenarios.