Total synthesis of tRNAfMet

Area of Science:

• Molecular Biology
• Biochemistry
• Synthetic Chemistry

Background:

• Transfer RNA (tRNA) molecules are crucial for protein synthesis, mediating the transfer of amino acids to ribosomes.
• The initiator tRNA (tRNAfMet) plays a specific role in initiating protein synthesis in bacteria like E. coli.
• Chemical synthesis of large RNA molecules, including tRNA, presents significant challenges.

Purpose of the Study:

• To chemically synthesize oligonucleotides corresponding to E. coli tRNAfMet fragments and their analogs.
• To assemble these fragments into a complete, functional tRNA molecule using enzymatic ligation.
• To verify the biological activity of the synthetic tRNAfMet by testing its ability to accept methionine.

Main Methods:

• Chemical synthesis of tRNAfMet fragments using phosphodiester and phosphotriester methods.
• Enzymatic joining of synthesized fragments using RNA ligase to form a complete tRNA molecule.
• Biochemical assays to assess methionine acceptance by the synthetic tRNA in the presence of purified methionyl-tRNA synthetase.
• Purification of charged tRNA and hydrolyzed methionine via gel filtration.
• Characterization of the discharged tRNA using nearest neighbor analysis and 5'-end analysis.

Main Results:

• Successful chemical synthesis of E. coli tRNAfMet fragments and analogs.
• Assembly of synthetic fragments into a complete tRNA molecule via RNA ligase.
• Demonstration of the synthetic tRNAfMet's ability to accept methionine.
• Isolation and characterization of the functional synthetic tRNA molecule.

Conclusions:

• The study successfully demonstrates the feasibility of chemically synthesizing and enzymatically assembling functional tRNA molecules.
• The synthetic E. coli tRNAfMet exhibits biological activity, specifically the acceptance of methionine.
• This work provides a foundation for the synthesis of other functional RNA molecules with potential applications in research and biotechnology.