Subcellular specialization of multifaceted 3'end modifying nucleotidyltransferases.

Area of Science:

• Molecular Biology
• RNA Biology
• Biochemistry

Background:

• Canonical mRNA and tRNA 3'end modifications are well-understood.
• Recent advances in RNA analysis reveal novel 3'end modification patterns.
• These modifications include non-templated nucleotide additions beyond standard polyadenylation.

Purpose of the Study:

• To explore the prevalence and mechanisms of non-canonical RNA 3'end modifications.
• To highlight the role of non-canonical RNA nucleotidyltransferases.
• To discuss the regulation of these RNA modification processes.

Main Methods:

• Review of recent technological advances in RNA analysis.
• Analysis of accumulated evidence on alternative RNA 3'end modifications.
• Examination of studies on non-canonical RNA nucleotidyltransferases and co-factors.

Main Results:

• Widespread non-canonical 3'end modifications involving mono- and oligo-nucleotide additions (adenosines, uracils) on various RNA species have been identified.
• Non-canonical RNA nucleotidyltransferases exhibit flexibility in substrate selection and activity.
• RNA nucleotidyltransferase activity, target selection, and sub-compartmentalization are regulated by co-factors in a spatially, temporally, and physiologically controlled manner.

Conclusions:

• Diverse 3'end formation mechanisms are prevalent and evolutionarily conserved across RNA species.
• Non-canonical RNA modifications play a significant role in RNA biology.
• The regulation of RNA nucleotidyltransferase activity by co-factors is crucial for cellular RNA processing.