Pseudouridine Modifications in Transfer RNA and tRNA Pseudouridine Synthases

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Pseudouridine is the most frequent modification in transfer RNA (tRNA) across all organisms.
• It is also found in other RNA types, including ribosomal, messenger, and nuclear RNAs.
• Pseudouridine synthases (PUS) enzymes catalyze this modification, with diverse specificities and functions.

Purpose of the Study:

• To review the reaction mechanisms and functions of pseudouridine synthases.
• To examine the six known families of pseudouridine synthases, detailing their structural similarities and variations.
• To highlight the emerging roles of pseudouridine and its modifying enzymes in viral infections and human diseases.

Main Methods:

• Literature review of pseudouridine synthases.
• Analysis of domain structures, motifs, and target uracil bases across different PUS families.
• Characterization of individual enzymes and their recently identified roles.

Main Results:

• Pseudouridine synthases exhibit varied substrate specificities, modifying tRNA, rRNA, snRNA, and mRNA.
• Functions of pseudouridine include tRNA structure stabilization and ensuring accurate protein synthesis, preventing frameshifts.
• Some PUS enzymes also act as RNA chaperones, aiding in RNA folding and stability.

Conclusions:

• Pseudouridine synthases are a diverse group of enzymes with critical roles in RNA metabolism and function.
• Understanding PUS mechanisms and functions provides insights into fundamental biological processes.
• Emerging evidence links pseudouridine and PUS to human health, including viral pathogenesis and disease development.