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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
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Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
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Archaea, named after the Archaean eon, represent a unique domain of life, distinct from bacteria and eukaryotes, with remarkable traits. Their cellular and molecular features, ecological adaptability, and industrial relevance highlight their importance in understanding life processes and leveraging biotechnology.Cellular and Molecular CharacteristicsA defining feature of archaea is their unique membrane composition. Archaeal membranes contain ether-linked isoprenoid lipids, which confer...
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Author Spotlight: AQRNA-seq Role in Mapping Small RNAs and Unraveling Protein Translation Mechanisms
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The Landscape of tRNA Modifications in Archaea.

Jesse S Leavitt1, Henry Moore1, Thomas J Santangelo2

  • 1Department of Biomolecular Engineering, Baskin School of Engineering, University of California Santa Cruz, Santa Cruz, CA 95064, USA.

Biorxiv : the Preprint Server for Biology
|July 14, 2025
PubMed
Summary

Transfer RNA (tRNA) modifications are crucial for cellular function. This study reveals coordinated and clade-specific tRNA modification patterns in archaea, linked to evolutionary enzyme changes.

Keywords:
Archaeaenzyme-substrate coevolutionhigh-throughput RNA modification mappingtRNA modification

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genomics

Background:

  • Transfer RNA (tRNA) modifications are vital for protein synthesis accuracy and efficiency.
  • The evolutionary trajectories and diversity of tRNA modifications are not fully understood.
  • High-throughput sequencing methods like Ordered Two-Template Relay sequencing (OTTR-seq) enable genome-wide tRNA modification analysis.

Purpose of the Study:

  • To comprehensively profile tRNA modifications across diverse archaeal species using OTTR-seq.
  • To investigate the evolutionary dynamics and patterns of tRNA modifications in archaea.
  • To correlate tRNA modifications with evolutionary changes in modifying enzymes.

Main Methods:

  • Ordered Two-Template Relay sequencing (OTTR-seq) for transcriptome-wide tRNA modification detection.
  • Comparative genomic analysis of tRNA modifying enzymes (e.g., Trm14, Trm10, Trm11, Trm1).
  • Analysis of tRNA identity elements, including D-stem structures like the G10oU25 pair.

Main Results:

  • Identified coordinated and mutually exclusive methylation patterns in hyperthermophilic archaea.
  • Discovered clade-specific co-modifications at core positions in Thermoprotei, indicating tolerance of anti-determinants.
  • Established associations between tRNA modifications and evolutionary divergence in enzyme domain architectures.
  • Provided further insights into D-stem identity elements governing enzyme-substrate interactions.

Conclusions:

  • Archaeal tRNA modification patterns exhibit significant evolutionary dynamics and diversity.
  • Evolutionary changes in tRNA modifying enzymes are linked to observed modification patterns.
  • Findings advance understanding of archaeal tRNA modification biology and evolution.
  • This study provides a basis for future biochemical and mechanistic investigations.