Structural basis for METTL6-mediated m3C RNA methylation

Area of Science:

• Molecular Biology
• Structural Biology
• Biochemistry

Background:

• RNA modifications are crucial for RNA biological functions.
• 3-methylcytidine (m3C) is an important RNA modification found in various RNA types.
• Human METTL6 is identified as a methyltransferase responsible for m3C modification in tRNAs.

Purpose of the Study:

• To elucidate the structure of human METTL6 in complex with S-adenosyl-L-methionine.
• To determine the enzymatic activity of human METTL6 towards tRNA^SER(UGA).
• To provide insights into the molecular interactions and potential tRNA binding sites of METTL6.

Main Methods:

• X-ray crystallography was used to solve the structure of human METTL6.
• Biochemical enzyme assays were performed to assess METTL6 activity.
• Structural analysis was conducted to understand molecular interactions.

Main Results:

• The crystal structure of human METTL6 in complex with S-adenosyl-L-methionine was determined.
• Recombinant human METTL6 demonstrated enzymatic activity towards tRNA^SER(UGA).
• Detailed interactions between S-adenosyl-L-methionine and METTL6 were revealed, suggesting a tRNA binding surface.

Conclusions:

• The structural and biochemical data provide a foundation for understanding METTL6 function.
• These findings pave the way for the rational design of METTL6 inhibitors.
• Further research can explore the therapeutic potential of targeting m3C RNA modification.