RNA Binding by the m6A Methyltransferases METTL16 and METTL3

Area of Science:

• Biochemistry
• Molecular Biology
• Epigenetics

Background:

• Methyltransferases are conserved enzymes modifying diverse substrates.
• RNA methylation, particularly N6-methyladenosine (m6A), is crucial in eukaryotes.
• METTL3 is the primary eukaryotic mRNA m6A methyltransferase; METTL16 also methylates RNA but is less understood.

Purpose of the Study:

• To review RNA methylation, focusing on m6A.
• To discuss the roles and targets of RNA methyltransferases, specifically METTL3 and METTL16.
• To explore the methylation-independent functions of these enzymes, particularly METTL16's RNA-binding capabilities.

Main Methods:

• Literature review of methyltransferase functions and RNA targets.
• Analysis of existing research on METTL3 and METTL16.
• Discussion of experimental evidence for methylation-dependent and -independent roles.

Main Results:

• METTL3 and METTL16 are key RNA m6A methyltransferases.
• Both enzymes exhibit methylation-independent functions, including translational regulation.
• METTL16's role as an RNA-binding protein may be more significant than previously recognized.

Conclusions:

• RNA methylation is a vital regulatory mechanism.
• METTL3 and METTL16 possess diverse functions beyond catalysis.
• Further research is needed to fully elucidate METTL16's targets and RNA-binding roles.